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AIIMS Full Mock Test 1

200 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Full Mock Test 1

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This mock test of AIIMS Full Mock Test 1 for NEET helps you for every NEET entrance exam. This contains 200 Multiple Choice Questions for NEET AIIMS Full Mock Test 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Full Mock Test 1 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Full Mock Test 1 exercise for a better result in the exam. You can find other AIIMS Full Mock Test 1 extra questions, long questions & short questions for NEET on EduRev as well by searching above.

QUESTION: 1

Voltage in the secondary coil of a transformer does not depend upon.

A.
Voltage in the primary coil
B.
Ratio of number of turns in the two coils
C.
Frequency of the source
D.
Both a and b

Solution:

As, V1/V2 = N1/N2;

so. V2 = (V1 x N2)/N1

Hence we can conclude voltage in secondary coil i.e V2 is independent of Frequency of the source but depends on Voltage in the primary coil and Ratio of number of turns in the two coils.

QUESTION: 2

The closest distance of approach of an α - particle travelling with a velocity 'V' to a certain nucleus is 'x'. The distance of closest approach of α - particle travelling with a velocity 3V to the same nucleus is

A.
3x
B.
x/3
C.
9x
D.
x/9

Solution:

QUESTION: 3

A 10 μF capacitor and a 20 μF capacitor are connected in series across 200 V supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together and no external voltage is applied. What is the potential difference across each capacitor?

A.
800/9 volt
B.
800/3 volt
C.
400 volt
D.
200 volt

Solution:

C₁ = 10μF, C₂ = 20μF
Fquivalent capacitance in series

Charge on each capacitor
q = CV

In seies charge in both capacitor is same.
∴ toal charge
Now the capacitors are connected in parallel.
Equivalent capacitance in parallel.

Potential

QUESTION: 4

If the de Broglie wavelengths for a proton and for a α-particle are equal, then the ratio of their velocities will be

A.
4:1
B.
2:1
C.
1:2
D.
1:4

Solution: H/ 4mv2=h/ mv1; V1:V2= 4:1

QUESTION: 5

Two solid rubber balls A and B having masses 200 and 400 gm respectively are moving in opposite directions with velocity A equal to 0.3 m/s. After collision the two balls come to rest, then the velocity of B is

A.
0.15 m/sec
B.
1.5 m/sec
C.
- 0.15 m/sec
D.
None of the above

Solution: M1= 200gm or 0.2kg, v1= 0.3m/s m2=400gm or 0.4 kg v2=? m1v1=m2v2 because after collision two ball are stop so collision is elastic and it's not depends on mass(action reactions rule) and it's then possible when two ball moving in opposite direction 0.2×0.3=0.4×(-v2) 0.06/0.4=- v2 v2=-0.15 ans.

QUESTION: 6

You are given several identical resistances each of value R = 10 Ω and each capable of carrying maximum current of 1 ampere. It is required to make a suitable combination of these resistances to produce a resistance of 5Ω which can carry a current of 4 amperes. The minimum number of resistances of the type R that will be required for this job

A.
4
B.
10
C.
8
D.
20

Solution:

QUESTION: 7

If intensity of incident light is increased in PEE then which of the following is true

A.
Maximum K.E. of ejected electron will increase
B.
Work function will remain unchanged
C.
Stopping potential will decrease
D.
Maximum K.E. of ejected electron will decrease

Solution:

QUESTION: 8

An electron and a proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is

A.
Zero
B.
Infinity
C.
Equal to kientic energy of the proton
D.
Greater than the kinetic energy of proton

Solution:

QUESTION: 9

According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photoelectrons from a metal versus frequency of the incident radiation gives a straight line, whose slope

A.
depends upon the intensity of the radiation
B.
depends upon the nature of the metal used
C.
depends both upon the intensity of radiation and the metal used
D.
is same for all metals and independent of the intensity of the radiation

Solution:

QUESTION: 10

The working of a dynamo is based on principle of

A.
Conversion of energy into electricity
B.
Magnetic effects of current
C.
Electromagnetic induction
D.
Heat effects of current

Solution:

QUESTION: 11

A 100 mH coil carries a current of 10 A. The magnetic energy stored in the coil is

A.
0.1 J
B.
0.5 J
C.
1 J
D.
5 J

Solution:

QUESTION: 12

A coil of inductances 300mH and resistance 2 Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in

A.
0.05s
B.
0.1s
C.
0.15s
D.
0.3s

Solution:

QUESTION: 13

Which of the following statement is true?

A.
Velocity of light is constant in all media
B.
Velocity of light in vacuum is maximum
C.
Velocity of light is same in all reference frames
D.
laws of nature have identical form in all reference frames

Solution: Velocity of light in vacuum is maximum is 3×10^8 and it's highest velocity.

QUESTION: 14

A straight wire of length l and electric dipole moment p is bent to from a semicircle. The new electric dipole moment would be

A.
p
B.
2p
C.
p/2π
D.
2p/π

Solution: Initial dipole moment, P = q × Lwhen it is bent in the form of a semicircle,L = πRR = L/πNow the charges are present at diametrically opposite points of the semicircleDistance between the charges = 2R = 2L/πNew dipole moment, P' = q × 2R = q × (2L/π) = 2p/π.

QUESTION: 15

A cylinder of radius r and length a is placed in a uniform in a uniform electric field E parallel to the axis of the cylinder. The total electric flux over the curved surface of cylinder is

A.
zero
B.
2πr²E
C.
2πr²aE
D.
π(r²+a)E

Solution:

The electric flux entering and leaving the cylindrical surface is same
Φ = EπR² - EπR² = 0
where, E = electric field
R = radius of cylinder
Φ = outward flux

QUESTION: 16

In an L-R circuit, the value of L is (0.4/π) henry and the value of R is 30 ohm. If in the circuit, an alternating emf of 200 volt at 50 cycles per second is connected, the impedance of the circuit and current will be

A.
11.4 ohm,17.5 ampere
B.
30.7 ohm,6.5 ampere
C.
40.4 ohm,5 ampere
D.
50 ohm, 4 ampere

Solution:

QUESTION: 17

The enegy stored in wound watch spring is

A.
K.E
B.
P.E
C.
Heat energy
D.
Chemical energy

Solution:

QUESTION: 18

A car travelling at a speed of 30 km/hr is brought to a halt in 8 m by applying brakes. If the same car is travelling at 60 km/hr, it can be brought to a halt with the same braking force in

A.
8 m
B.
16 m
C.
24 m
D.
32 m

Solution: Yes option D is correct answer...solution..v^2=u^2-2as0=u^2-2asu^2 is directionally proportional to s(u1÷u2)^2=s1÷s2since;u1=30 and u2=60 and s1=8 and s2=?30×30/60×60=8/s21/4=8/s2so;s2=32m..

QUESTION: 19

The rate of transfer of heat is more in

A.
Liquification
B.
Convection
C.
Conduction
D.
Radiation

Solution: Radiation is electromagnetic wave traveling at highest possible speed. Example is sun ray coming through space nd falling on earth. It takes 8.5min approx to cover the distance nd governed by radiation.

QUESTION: 20

Time taken by a 846 W heater to heat one litre of water from 10ºC to 40ºC is

A.
50 sec
B.
100 sec
C.
150 sec
D.
200 sec

Solution: Use Pt=Q=ms∆T where P: Power ,t:time,∆T: change in temperature,Q:heat ,m:mass846×t=Q=1×4200×(40-10)t≈150 seconds.

QUESTION: 21

Two similar bar magnets P and Q each of magnetic moment M are taken. If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have each of

A.
Equal pole strength
B.
Magnetic moment M/4
C.
Magnetic moment M/2
D.
Magnetic moment M

Solution:

QUESTION: 22

A bar magnet, of magnetic moment M, is placed in a magnetic field of induction B. The torque exerted on it is

A.
M̅.B̅
B.
-M̅.B̅
C.
M̅XB̅
D.
-B̅.M̅

Solution:

QUESTION: 23

Two wires of the same material and length, but diameters in the ratio 1 : 2 are stretched by the same force. The elastic potential energy stored per unit volume for the two wires when stretched, will be in the ratio of

A.
2 : 1
B.
4 : 1
C.
8 : 1
D.
16 : 1

Solution:

QUESTION: 24

The ratio of the weight of a man in a stationary lift and when it is moving downward with uniform acceleration 'a' is 3:2. The value of 'a' is (g-Acceleration due to gravity of the earth)

A.
3/2 g
B.
g/3
C.
2/3 g
D.
g

Solution:

QUESTION: 25

Half life of a radioactive substance which disintegrates by 75% in 60 minutes will be

A.
120 min
B.
30 min
C.
45 min
D.
20 min

Solution: Yes option B is correct answer....because 75 percentage of the substance is disintegrate by 2 half lives..2half lives=60÷t1t1=60÷2=30therefore: t=30 minutes...

QUESTION: 26

If a spring is extended to length l, then according to Hooke's law

A.
F = kl
B.
F = k/l
C.
F = k²l
D.
F = k²/l

Solution: The Correct option is A. Hooke's law states that the force(F) needed to extend or compress a spring by some distance l sacked linearly with respect to that distant. That is F= kl. Here the -ve sign indicates the spring restoring force is opposite to the stretch direction.

QUESTION: 27

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): We use a thick wire in the secondary of a step down transformer to reduce the production of heat.
Reason(R): When the plane of the armature is parallel to the line of force of magnetic field, the magnitude of the induced emf is maximum.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 28

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Efficiency of an engine with sink temperature of zero Kelvin is 100%.
Reason(R): Keeping the sink at ice point with the source at 100^oC will bring 100% efficiency.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 29

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Electrical resistivity of typical insulator (≃ 10¹⁴Ω-m) is about 10²² times that of metal (≃ 10^-8Ω-m) while in case of heat it is only about 10³ (as K_Ag ≃ 400 W/mk while K_glass ≃ 1 W/mk)
Reason(R): In electrical conduction only free electrons take part while in thermal conduction both lattice and free electrons contribute.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 30

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 31

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Energy output in a fusion reaction is very much less than energy released in the fission process.
Reason(R): Fusion is a weaker energy-source than fission.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

The energy output in a fusion reaction (21.6 MeV) is very much less than the energy released in the fission of a U²³⁵ nucleus (190 MeV). But this does not mean that fusion is a weaker energy source than fission. The number of hydrogen nuclei in 1 gram of heavy hydrogen is much larger than the number of U²³⁵ nuclei in 1 gram of uranium. Therefore, the energy obtained by the fusion of a certain mass of heavy hydrogen is much larger than tje energy obtained by the fission of equal mass of uranium

QUESTION: 32

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The magnetic field at the ends of a very long current carrying solenoid is half of that at the centre.
Reason(R): If the solenoid is sufficiently long, the field within it is uniform.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 33

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): At the same temperature, the speed of sound in oxygen is one-fourth the speed of sound in hydrogen.
Reason(R): Molecular weight of oxygen is more than the molecular weight of hydrogen .

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is true but Reason is false.

Solution:

QUESTION: 34

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 35

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): A charged particle moves perpendicular to magnetic field. Its kinetic energy remains constant, but momentum changes.
Reason(R): Force acts perpendicular to velocity of the particle.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 36

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Thermistor is a device to detect small change in temperature.
Reason(R): The magnitude of the temperature coefficient of resistivity is often quite large for semiconducting material.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 37

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): It is easier to start a car engine on a warm day than cold day.
Reason(R): Internal energy of the engine is high on a warm day than a cold day .

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion is false but Reason is true.

Solution:

QUESTION: 38

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 39

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Study of Fraunhofer lines in the spectrum of sun led to the discovery of hydrogen.
Reason(R): Fraunhofer lines are dark lines in the continuous solar spectrum.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 40

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Pressure in a bubble (σ) in an atmosphere of pressure P₀ is where r is the radius.
Reason(R): is the excess pressure due to two surfaces exposed to the atmosphere.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 41

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Refractive index of a material depends on the frequency of the light
Reason(R): Incoming e.m. wave applies an electric field and polarises it, contributing to (∈) permittivity of the medium, depending on its frequency.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 42

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The maximum frequency of the photon produced by the union of a positron and an electron is 1.2 x10²⁰Hertz.
Reason(R): In electron-positron collision, both are annihilated and the total mass is converted into γ-photon(energy).

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 43

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Electron capture occurs more often than positron emission in heavy elements.
Reason(R): Heavy elements exhibit radioactivity.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 44

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 45

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 46

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Two parallel wires carrying current in the same direction attract each other.
Reason(R): Two similar charges moving parallel to each other in same direction repel each other.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 47

An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplied by the motor is

A.
20 W
B.
200 W
C.
2 W
D.
10 W

Solution: Power=work÷ time =40×30÷60seconds =20W

QUESTION: 48

If the horizontal range of a projectile is equal to the maximum height reached, then the corresponding angle of projection is

A.
tan^-1 (1)
B.
tan^-1 (√3)
C.
tan^-1 (4)
D.
tan^-1 (12)

Solution:

Horizontal range = maximum height reached

QUESTION: 49

The maximum energy received by the earth from the sun is in the form of

A.
X-rays
B.
α − rays
C.
Ultraviolet rays
D.
Infrared-rays

Solution: According to plancks equation E=hv, x rays have high frequency compared to others.

QUESTION: 50

The refracting angle of a prism A is small. The correct statement for the dispersive power of a prism is that dispersive power

A.
Depends upon the material of prism
B.
Depends upon both material and angle of prism
C.
Depends only upon refracting angle of prism
D.
Is same for all colours of white light

Solution:

QUESTION: 51

Under minimum deviation condition in a prism, if a ray is incident at an angle 30º , the angle between the emergent ray and the refracting surface of the prism is

A.
0º
B.
30º
C.
45º
D.
60º

Solution:

QUESTION: 52

The valency of an impurity added to germanium crystal in order to convert it into a P-type semi-conductor is

A.
6
B.
5
C.
4
D.
3

Solution:

QUESTION: 53

Zener breakdown in a semi-conductor diode occurs when

A.
Forward current exceeds certain value
B.
Reverse bias exceeds certain value
C.
Forward bias exceeds certain value
D.
Potential barrier is reduced to zero

Solution: Its only used in reverse bias only and when the exceeds its maximum value the graph of reverse bias goes straight means current suddenly increases to a large value so than only zener breakdown occurs.

QUESTION: 54

Which of the following does not make use of chemical effect of current?

A.
voltaic cell
B.
electroplating
C.
thermoelectric refrigerator
D.
extraction of metals from ores

Solution: Thermoelectric refrigerator based on the physical effect of current that when current flows to one side it also carries heat with it making the other side cooler.

QUESTION: 55

The dimensions of Planck's constant and angular momentum are respectively

A.
[ML² T⁻¹] and [MLT⁻¹]
B.
[ML² T⁻¹] and [ML² T⁻¹]
C.
[MLT⁻¹] and [ML² T⁻¹]
D.
[M⁰LT⁻¹] and [ML² T⁻¹]

Solution:

QUESTION: 56

The unit of acceleration is a

A.
basic unit
B.
derived unit
C.
fundamental unit
D.
all of these

Solution:

QUESTION: 57

In Huygen's wave theory, the locus of all points oscillating in the same phase is called a

A.
ray
B.
vibrator
C.
wavefront
D.
half period zone

Solution:

QUESTION: 58

A wave front travels

A.
Parallel to the rays
B.
Perpendicular to the rays
C.
Both A and B
D.
None of these

Solution:

QUESTION: 59

Ratio of intensities of two waves is given by 4 : 1. Then, ratio of the amplitudes of the two waves is

A.
2 : 1
B.
1 : 2
C.
4 : 1
D.
1 : 4

Solution:

QUESTION: 60

It is easier to draw up a wooden block along a inclined plane than to haul it vertically, principally because

A.
The friction is reduced
B.
The mass becomes smaller
C.
Only a part of the weight has to be overcome
D.
'g' becomes smaller

Solution:

QUESTION: 61

Glycerol on heating with potassium bisulphate yields

A.
Acetone
B.
Acrolein
C.
Glyceraldehyde
D.
Propanol

Solution:

QUESTION: 62

The maximum amount of BaCl₄ precipitated on mixing BaCl₂ (0.5 M) with H₂SO₄ (1M) will correspond to

A.
0.5 M
B.
1.0 M
C.
1.5 M
D.
2.0 M

Solution:

1. In question it should ask to calculate amount BaSO4 in terms of moles.

2. The reaction is :

BaCl2 + H2SO4 →→ BaSO4 + 2HCl

3. 1 mole of BaCl2 reacts with 1 mole of H2SO4 to give 1 mole of BaSO4.

But here 0.5 M of BaCl2 is present for 1 mole of H2SO4.

So, BaCl2 is the limiting reagent,and 0.5M of BaSO4 is obtained.

QUESTION: 63

An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of compound is

A.
C₃H₅O₂
B.
C₆H₁₀O₄
C.
C₃H₁₀O₂
D.
C₄H₁₀O₂

Solution: Vapour density=73 ...therefore mol.mass=VD×2=146. there is only one optn with m.mass 146 .. option B is corrrect.

QUESTION: 64

The oxidation of toluene with air in the presence of V₂O₅ catalyst, gives

A.
benzoic acid
B.
chlorobenzene
C.
benzoic anhydride
D.
vanadium benzoate

Solution:

QUESTION: 65

Which of the following possesses the highest melting point?

A.
Chlorobenzene
B.
o-Dichlorobenzene
C.
m-Dichlorobenzene
D.
p-Dichlorobenzene

Solution:

QUESTION: 66

The size of C ― C bond in benzene, is

A.
1.22Å
B.
1.39Å
C.
1.54Å
D.
1.56Å

Solution:

QUESTION: 67

Water gas is a mixture of

A.
CO and H₂
B.
CO₂ and H₂O
C.
CO and N₂
D.
CO, H₂ and N₂

Solution:

QUESTION: 68

In graphite, the electrons are

A.
localised on each C-atom
B.
present in anti-bonding orbital
C.
localised on every third C-atom
D.
spread out between the structure

Solution:

QUESTION: 69

Which of the following species is paramagnetic?

A.
CO₂
B.
NO
C.
CO₂²⁻
D.
CN⁻

Solution:

QUESTION: 70

A first order reaction is 50% complete in 10 minutes. The rate constant of the reaction is

A.
0.347 min⁻¹
B.
0.693 min⁻¹
C.
0.013 min⁻¹
D.
0.5 min⁻¹

Solution:

QUESTION: 71

Which of the following is true about catalyst?

A.
The catalyst altered during the reaction is regenerated
B.
It does not alter the equilibrium
C.
It lowers the energy of activation
D.
All the above

Solution:

QUESTION: 72

Heat capacity is

A.
dQ/dT
B.
dQ x dT
C.
∑Q. 1/dt
D.
none of these

Solution:

QUESTION: 73

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 74

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Oxidation of amino-naphthalene yields phthalic acid.
Reason(R): An amino group attached to the benzene ring renders it sensitive to oxidation.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 75

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 76

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): In an acid-base titration involving strong base and a weak acid. methyl orange can be used as an indicator.
Reason(R): Methyl orange changes its colour in the pH range 3 to 5.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 77

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): S_(N)1 mechanism is facilitated by polar protic solvents like water, alcohol etc.
Reason(R):C₆H₅CH(C₆H₅)−Br is less stable than C₆H₅CH(CH₃)Br in S_(N)1 reactions.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 78

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution: Assertion is correct but reason is incorrect because all enzymes are catalyst but all catalyst are not enzyme it may be hormones or other chemicals..

QUESTION: 79

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): KCl/NaCl/NH₄Cl etc. cannot be used in the salt bridge of a cell containing silver.
Reason(R): A salt bridge contains concentrated solution of an inert electrolyte like KCl, KNO₃, K₂SO₄ etc. or solidified solution of such an electrolyte in agar-agar and gelatine.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 80

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 81

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Aqueous solution of Na₂CO₃ is alkaline in nature.
Reason(R): When dissolved in water, Na₂CO₃ undergoes anionic hydrolysis to form strong base and weak acid.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 82

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Absorption spectrum consists of some bright lines separated by dark lines.
Reason(R): Emission spectrum consists of dark lines.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 83

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 84

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Potash alum is used in purification of water.
Reason(R): Potash alum is able to precipitate colloidal particles present in dirty water.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 85

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 86

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Melting point of calcium halides decreases in the order CaI₂>CaBr₂>CaCl₂.
Reason(R): Smaller ions have lesser polarisability and thus their compounds are more ionic.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 87

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Water is not known to react with metal salts.
Reason(R): Water occupies the interstitial sites in the crystal lattice of some compounds.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 88

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 89

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Non-metals oxidation state of metal
Reason(R): Oxidation state of metal becomes positive as it is oxidised and non-metal becomes negative asitis reduced.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
None of these

Solution:

QUESTION: 90

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 91

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 92

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Fluoroacetic acid is a stronger acid than chloroacetic acid.
Reason(R): Carboxylic acids are waeak acids and turn blue litmus red .

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 93

For measuring the conductivity of an electrolyte its solution should be prepared in

A.
Tap water
B.
Distilled water
C.
Conductivity water
D.
Polywater

Solution:

QUESTION: 94

Solution of sodium metal in liquid ammonia is strongly reducing due to the presence in the solution of the following

A.
Sodium hydride
B.
Sodium amide
C.
Sodium atoms
D.
Solvated electrons

Solution:

QUESTION: 95

At what temperature, the volume of a gas at 0ºC will become double, when pressure remains constant?

A.
0ºC
B.
273ºC
C.
546ºC
D.
173ºC

Solution:

QUESTION: 96

Which of the following compounds is used in gun powder?

A.
NaNO₃
B.
KNO₃
C.
LiNO₃
D.
None

Solution:

QUESTION: 97

The equivalent conductance of NaCl, HCl and C₂H₅COONa at infinite dilution are 126.45, 426.16 and 91 ohm⁻¹ cm² respectively. The eq. conductance of C₂H₅COOH is

A.
201.28 ohm⁻¹ cm²
B.
390.71 ohm cm²
C.
698.28 ohm cm²
D.
540.48 ohm cm²

Solution:

QUESTION: 98

Which of the following alkali metal ions has lowest ionic mobility in aqueous solution?

A.
Rb⁺
B.
Cs⁺
C.
Li⁺
D.
Na⁺

Solution:

QUESTION: 99

A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame no distinctive colour is noted, which cation would be present?

A.
Be²⁺
B.
Ba²⁺
C.
Rb²⁺
D.
Ca²⁺

Solution:

QUESTION: 100

Chlorine acts as a bleaching agent only in the presence of

A.
Dry air
B.
Moisture
C.
Sun light
D.
None of these

Solution:

QUESTION: 101

What happens when few drops of H₂SO₄ are added to water?

A.
ionic product increase
B.
ionic product decrease
C.
OH⁻ concentration increases
D.
OH⁻ concentration decreases

Solution: H2SO4 is acid so H+ Ion conc. increase and OH- ion conc. decrease..

QUESTION: 102

The process used for the removal of hardness of water is

A.
Calgon
B.
Baeyer
C.
Serpeck
D.
Hoope

Solution:

QUESTION: 103

If one drop of methyl orange is added in a solution, the solution becomes pink. The solution is

A.
acidic
B.
basic
C.
neutral
D.
amphoteric

Solution:

QUESTION: 104

Identify the indicator used to titrate Na₂CO₃ solution with HCl

A.
phenolphalein
B.
Cresol red
C.
Methyl orange
D.
None

Solution:

QUESTION: 105

Which of the following reagents is used to distinguish acetone and acetophenone?

A.
NaHSO₃
B.
Grignard reagent
C.
Na₂SO₄
D.
NH₄Cl

Solution:

QUESTION: 106

Hydrogen ion concentration of 0.2 M CH₃COOH, which is 40% dissociated, is

A.
0.4 M
B.
0.8 M
C.
0.12 M
D.
0.08 M

Solution:

QUESTION: 107

Which of the following compounds can react with the Lewis base Cl⁻ in a Lewis acid-base reaction?

A.
CH₄
B.
AlCl₃
C.
OH^-
D.
CH₃⁻

Solution: AlCl3 is a electron deficient it's octate is incomplete so it will accept electron and act as L.acid

QUESTION: 108

Benzophenone can be converted into benzene using

A.
Fused alkali
B.
anhydrous AlCl₃
C.
Sodium amalgam in water
D.
acidified dichromate

Solution:

QUESTION: 109

The addition of HBr to alkenes in the presence of peroxides is called :

A.
free radical addition reaction
B.
carbocation addition reaction
C.
nucleophilic addition reaction
D.
electrophilic addition reaction

Solution:

QUESTION: 110

Conc.HNO₃ forms in presence of:

A.
conc.H₂SO₄
B.
Fe
C.
FeBr₃
D.
AlCl₃

Solution:

QUESTION: 111

Which does not contain conjugate system?

A.
CH₂═CH―CH═CH₂
B.
CH2═CHCHO
C.
CH₃CH═CH₂
D.

Solution:

In dienes, when the double bonds connected to each other by a single bond, this arrangement is known as conjugated.

QUESTION: 112

Which of the following is the second most abundant element in the earth's crust?

A.
carbon
B.
oxygen
C.
silicon
D.
nitrogen

Solution:

QUESTION: 113

Piezoelectric crystals are used in

A.
TV
B.
radio
C.
refrigerator
D.
record-player

Solution:

QUESTION: 114

Quartz is a crystalline variety of

A.
silica
B.
silicon
C.
silicon carbide
D.
sodium silicate

Solution:

QUESTION: 115

At room temperature, the mole fraction of a solute is 0.25 and the vapour pressure of a solvent is 0.80 atm. Then the lowering of vapour pressure is

A.
0.75
B.
0.60
C.
0.80
D.
0.20

Solution:

QUESTION: 116

The process of osmosis was first discovered by

A.
Nollet
B.
Pfeffer
C.
Traube
D.
Dutrochet

Solution:

QUESTION: 117

The volume of 0.1 M H₂SO₄ solution required to neutralise 50 ml of 0.2 M NaOH solution is

A.
25 ml
B.
50 ml
C.
75 ml
D.
100 ml

Solution:

QUESTION: 118

7 grams of CO on complete oxidation produce the following weight of CO₂

A.
14
B.
11
C.
42
D.
30

Solution:

QUESTION: 119

Which of the following properties are not correct for enantiomers?

A.
They have identical physical properties except for the direction of rotation of the plane polarised light
B.
They have identical biological properties
C.
They have identical chemical properties but react differently towards other optically active substances
D.
Equal mixtures of d- and l- enantiomers are called racemic mixture

Solution:

QUESTION: 120

The valence shell of transition elements consist of

A.
nd orbitals
B.
(n-1)d orbitals
C.
ns np nd orbitals
D.
(n-1)d ns orbitals

Solution:

QUESTION: 121

The outermost shealth of connective tissues, that surrounds a skeletal muscle, is

A.
epimer
B.
epimere
C.
epimerite
D.
epimysium

Solution: These and other connective tissues associated with muscles follow: The endomysium is the connective tissue that surrounds each muscle fiber (cell). The perimysium encircles a group of muscle fibers, forming a fascicle. The epimysium encircles all the fascicles to form a complete muscle.

QUESTION: 122

The skull of birds is

A.
Monocondylic
B.
Dicondylic
C.
Amphicondylic
D.
None of the above

Solution:

QUESTION: 123

Trilobites evolved during

A.
Pre-cambrian
B.
Cambrian
C.
Ordovician
D.
Silurian

Solution: Trilobites meaning "three lobes") are a fossil group of extinct marine arachnomorph arthropods that form the class Trilobita. Trilobites form one of the earliest known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (521 million years ago), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders except the Proetids died out. Trilobites disappeared in the mass extinction at the end of the Permian about 252 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years.

QUESTION: 124

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): The final reabsorption of water from urine into blood occurs through the collecting duct of a mammalian nephron, resuliting in the production of hyperosmotic urine.
Reason(R): The loop of Henle is responsible for the formation of a sodium gradient across the depth of the cortical interstitium of a mammalian kidney.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

The effect of collecting duct depends on the prescence of vasopressin. This hormone increases the permeability of the collecting duct to water. Gradually the rate of reabsorption from the filterate increases and it becomes hyperosmotic.
Loop of Henle is a U-shaped tubular part which lies in the renal medulla, which has a thin walled permeable descending limb and thick walled impermeable ascending limb.Na⁺, K⁺ and Cl^- are transported out of thick segement of ascending limb.

QUESTION: 125

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Ants generally disperse the fruits and seeds having oil bodies.
Reason (R): They feed on the oily substances.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 126

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Cordate and obcordate both are heart-shaped leaves.
Reason (R): Cordate and obcordate are synonymous.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 127

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Meiotic division results in the production of four dissimilar cells.
Reason(R): Synapsis occurs during zygotene of meiosis.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

Mitosis give rise to two daughter cells, which are identical to each other as well as to the parent cell.While, Meiosis is a double division which occurs in a diploid cell (or nucleus) and gives rise to four haploid cells (or nuclei), each having half the number of chromosomes as compared to the parent cell.Meiosis give rise to four daughter cells. These four cells, though resemble each other with respect to chromosome number, they differ, since paternal and maternal chromosomes would reassort during first division and these would give rise to new types due to exchange of chromosome segments. Synapsis occurs during zygotene of meiosis. The two homologous chromosomes get attached to each other, and the process of attachment is known as synapsis. It produces a complex known as synaptinemal complex.

QUESTION: 128

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Primary cambium is a lateral meristem.
Reason (R): Cork cambium is the secondary meristem.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 129

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): When the ambient temperature is high and soil contains excess of water, the plants tend to lose water in the form of droplets from lenticels.
Reason(R): Root pressure regulates the rate of loss of water form lenticels.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

When the ambient temperature is high and soil contains excess water, the rate of transpiration is increased i.e. loss of water takes place from leaves through stomata.
Lenticular transpiration is only 0.1% of the total transpiration. It however continues day and night because lenticels have no mechanism of closure. The lenticels connect the atmospheric air with the cortical tissue of stem through intercellular spaces present amongst the complementary cells. Root pressure regulates the rate of loss of water from the stomata in some plants.

QUESTION: 130

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): An embryo is formed from the fertilized egg.
Reason (R): An embryo always contains an embryonal axis with two cotyledons.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 131

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Cladodes are atems of unlimited growth.
Reason (R): Only the main stem is modified as cladodes.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 132

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Collenchyma is dead cell.
Reason (R): Walls of collenchyma cells are completely thickened.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is false but Reason is true.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 133

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Presently, the global atmosphere is warming up.
Reason(R): The depletion of stratospheric ozone layer has resulted in increase in ultraviolet radiations reaching the earth.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

The warming up of global atmosphere in the present day is ddue to the increase in green house effect.The greenhouse effect is the process by which absorption and emission of infrared radiation by gases in the atmosphere warm a planet's lower atmosphere and surface.
There is concern that increasing concentration of the green house gases including CO₂, CH₂ and man made chloroflurocarbons (CFCs), may enhance the green house effect and cause global warming. Ozone layer present in the stratosphere is depleted by the aerosols and chloroflurocarbonss.Ozone protects the earth from high energy ultra violet radiation.

QUESTION: 134

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Coconut tree is distributed in coastal areas over a large part of the world.
Reason(R): Coconut fruit can float and get dispersed over thousands of kilometers before losing viability.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

Coconut tree is grown in coastal areas because it needs hot and wet climate. Coconut fruit show hydrochory i.e. the dispersal takes place through water medium. The coconut fruit is adopted the habitat of coastal areas, so the fruit can float and get dispersed over thousand of kelometers before losing viability.

QUESTION: 135

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Many visitor to the hills suffer from skin and respiratory allergy problems.
Reason(R): Conifer trees produce a large quantity of wind-borne pollen grains.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

In hilly regions many trees like Oak, Elm, Hickory, Pecan and Cedar produce allergic pollen grains which cause allergy to people visiting the hills which results in the respiratory and skin problems.The symptoms of pollen allergy are- sneezing, itching eyes, nose and throat, dark circles under eyes caused by restricted blood flow near the sinuses, watering eyes and conjunctivitis.
Conifer trees produce a large quantity of wind borne pollen grains because many pollen grains are destroyed in the process of pollination done by wind.But these large number of pollen grains cause allergies.

QUESTION: 136

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Plant roots absorb water from soil colloids.
Reason (R): Hygroscopic water is held by soil colloids.

A.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
B.
Both Assertion and Reason are false.
C.
Assertion is false but Reason is true.
D.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Solution:

QUESTION: 137

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Watson and Crick provided experimental proof of semiconservative nature of DNA replication.
Reason(R): DNA polymerase binds nucleotides in replication.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Assertion is false and reason is true.

Solution:

Watson and Crick suggested that replication of DNA is semiconservative.According to the semi Conservative mode each strand of the two double helices formed would have one old and one new strand.
While semiconservative nature of DNA replication was proved by Messelsn and Stahl by using heavy isotope of nitrogen (15N). DNA polymerase III establishes phosphodiester linkages between the adjacent deoxyribonucleodise phosphate in presence of ATP/GTP, TPP and Mg²⁺. It produces a new strand of DNA. DNA polymerase binds nucleotides in 5'-3' direction.

QUESTION: 138

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Inhabitants close to very busy airports are likely to experience health hazards.
Reason(R): Sound level of jet aeroplanes usually exceeds 160 dB.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

Inhabitants close to very busy airports are likely to experience health hazards. Because maximum acceptable range of sound is 80 to 90 dB. But in the places like airports this level is always exceeds thus it creates sound pollution and related health hazards like auditory fatigue, deafness etc.
Jet planes generally produce sound above 160 dB which is much more than normal level, thus they also produce sound pollution. But as jet aeroplanes are used for some special purposes, they normally do not land in common airports. Thus it has no direct relation in causing sound pollution and related hazards in areas nearby very busy airports.

QUESTION: 139

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): In C₃ plants, photosynthesis is reduced on high temperature.
Reason (R): C₄ plants have high photosynthesis of high temperature.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 140

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Shoot apex is protected by young buds.
Reason (R): Reproductive shoot apex is protected also by leaf primordia.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is false but Reason is true.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 141

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

Collenchyma is a specialized type of parenchyma which is a supporting tissue. The cell walls are irregulary thickened due to the deposition of cellulose and pectin.

QUESTION: 142

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Photomodulation of flowering is a phytochrome - regulated process.
Reason(R): Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.

A.
Both assertion and reason are true and reason is the correct explanation of assertion.
B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
C.
Assertion is true but reason is false.
D.
Both assertion and reason are false.

Solution:

Flowering is a phytochrome regulated process.Phytochrome is a blue protein pigment with a molecular mass of about 125 kDa.Phytochrome occurs in two interconvertible forms P_R which absorbs red light and P_FR which absorbs far red light.
P_FR is active form of phytochrome.When P_R molecules are exposed to red light most of them absorb it and are then converted to P_FR. This cnversion causes floral induction in the shoot.

QUESTION: 143

In the following questions, a statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the statements carefully and mark the answer-
Assertion (A): There are several types of chlorophylls.
Reason (R): Chlorophyll is an asymmetrical molecule.

A.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C.
Assertion is false but Reason is true.
D.
Both Assertion and Reason are false.

Solution:

QUESTION: 144

A condition called tachycardia exists when a person’s heart rate is abnormally high. Which of the following explains how tachycardia may arise?

A.
The Purkinje fibres are over-stimulating the pacemaker.
B.
The sinoatrial (SA) node is receiving increased stimulation.
C.
There is increased stimulation by the parasympathetic nervous system.
D.
Impulses from the sinoatrial (SA) node are not reaching the atrioventricular (AV) node.

Solution:

QUESTION: 145

Cellulose is

A.
Hexosan polysaccharide
B.
Pentosan polysaccharide
C.
Heptopolysaccharide
D.
Heteropolysaccharide

Solution:

QUESTION: 146

Which of these does not belong with the others?

A.
lipase
B.
sucrase
C.
maltase
D.
lactase

Solution: Lipase is a enzyme...while remaining are sugars..

QUESTION: 147

Maximum calories are produced by-

A.
Vitamins
B.
Proteins
C.
Carbohydrates
D.
Fats

Solution:

QUESTION: 148

The enamel of tooth is secreted by

A.
odontoblast
B.
osteoblast
C.
ameloblast
D.
chondroblast

Solution:

QUESTION: 149

Pesticides kill

A.
only plant pest
B.
harmful insect
C.
only specific insects
D.
both harmful and useful insects

Solution:

QUESTION: 150

International Rice Research Institute (IRRI) is located at

A.
Tokyo (Japan)
B.
Hyderabad (India)
C.
New York (U.S.A.)
D.
Manila (Philippines)

Solution:

QUESTION: 151

Cotton fibres are made up of

A.
cellulose
B.
protein
C.
starch
D.
fats

Solution:

QUESTION: 152

Duchenne's muscular dystrophy is a

A.
Dominant sex-linked disorder
B.
Recessive sex-linked disorder
C.
Dominant autosomal disorder
D.
Recessive autosomal disorder

Solution:

QUESTION: 153

Dryopithecus had

A.
Semi-erect posture
B.
Rounded head
C.
Wide large jaw
D.
All the above

Solution:

QUESTION: 154

The enzyme responsible for transcription is

A.
DNA polymerase
B.
RNA polymerase
C.
RNA polymerase-I
D.
RNA polymerase-II

Solution:

QUESTION: 155

Reverse transcriptase is also known as

A.
RNA dependent RNA polymerase
B.
DNA dependent RNA polymerase
C.
DNA dependent DNA polymerase
D.
RNA dependent DNA polymerase

Solution:

QUESTION: 156

When the two genetic loci produce identical phenotypes in cis and trans position, they are considered to be

A.
pseudoalleles
B.
different genes
C.
multiple alleles
D.
the parts of same gene

Solution:

QUESTION: 157

Surgical removal of thymus of a new born shall result in failure to produce

A.
Monocytes
B.
B-lymphocytes
C.
T-lymphocytes
D.
Basophils

Solution:

QUESTION: 158

Bacteria which convert atmospheric nitrogen into nitrogen compounds are called

A.
Nitrogen fixing bacteria
B.
Nitrifying bacteria
C.
Putrefying bacteria
D.
Denitrifying bacteria

Solution:

QUESTION: 159

Antibody is connected with

A.
Immune system
B.
Digestive system
C.
Respiratory system
D.
Skeletal system

Solution:

QUESTION: 160

Salmonella causes

A.
Polio
B.
T.B.
C.
Tetanus
D.
Typhoid

Solution:

QUESTION: 161

AIDS spreads through

A.
Blood tranfusion
B.
Placental transmission
C.
Sexual intercourse
D.
All the above

Solution:

QUESTION: 162

Edible part of Cauliflower is

A.
Bud
B.
Bract
C.
Inflorescence
D.
Leaves

Solution:

QUESTION: 163

Immunoglobin found in serum is

A.
IgG
B.
IgA
C.
IgM
D.
IgN

Solution:

QUESTION: 164

At a synapse, the neurotransmitters move to the receptor sites by

A.
osmosis
B.
Diffusion
C.
Active transport
D.
Facilitated transport

Solution:

QUESTION: 165

Rotation of crops is useful for

A.
Increasing mineral quantity of soil
B.
Increasing fertility of soil
C.
High protein content
D.
Denitrification of crops

Solution:

QUESTION: 166

Which of the following compounds are widely distributed in both plants and animals?

A.
insulin
B.
vitamins
C.
steroids
D.
acetic acid

Solution:

QUESTION: 167

Vascular bundles are absent in

A.
Gymnosperms
B.
Angiosperms
C.
Pteridophytes
D.
All the above

Solution:

A/c to option most preferable Ans is c Becoz vascular bundle is not well develope in pteridophyta so optionC is correct.

QUESTION: 168

Who proved that oxygen envolved in photosynthesis comes from water?

A.
Mayer
B.
Calvin
C.
Ruben, Hassid and Kamen
D.
Blackman

Solution:

QUESTION: 169

In the two light reactions of photosynthesis

A.
PS I produces strong oxidant while PS II a strong reductant
B.
PS I produces strong reductant NADPH while PS II a strong oxidant
C.
PS I emits electrons for PS II
D.
PS I produces ATP which is not formed by PS II

Solution:

QUESTION: 170

Some effects of sulphur dioxide and its transformation products on plant include

A.
plasmolysis
B.
golgi body destruction
C.
protein dis-integration
D.
chlorophyll destruction

Solution:

QUESTION: 171

In which of the following phloem occurs in two patches

A.
Maize
B.
Cucurbia
C.
Sunflower