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AIIMS Full Mock Test - 9

200 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Full Mock Test - 9

Description

This mock test of AIIMS Full Mock Test - 9 for NEET helps you for every NEET entrance exam. This contains 200 Multiple Choice Questions for NEET AIIMS Full Mock Test - 9 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Full Mock Test - 9 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Full Mock Test - 9 exercise for a better result in the exam. You can find other AIIMS Full Mock Test - 9 extra questions, long questions & short questions for NEET on EduRev as well by searching above.

QUESTION: 1

A coil of inductance 40 H is connected in series with a resistance of 8 Ω and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is

A.
5 sec
B.
20 sec
C.
8 sec
D.
40 sec

Solution:

QUESTION: 2

In photoelectric phenomenon, the number of photo electrons emitted depends on

A.
The intensity of incident radiation
B.
The frequency of incident radiation
C.
The velocity of incident radiation
D.
The work function of photo cathode

Solution:

Photoelectric current depends on the intensity of incident light, the number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation.

QUESTION: 3

Identify that set in which all the three sustances are good conductors of electricity

A.
Cu,Ag,Au
B.
Cu,Si, diamond
C.
Cu,Ag,Plastic
D.
Cu,Ge,wood

Solution:

QUESTION: 4

An air capacitor of capacity C = 10μ F is connected to a constant voltage battery of 12 volt. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is

A.
120 μ C
B.
600 μ C
C.
480 μ C
D.
24 μ C

Solution:

C = 10 μ F
Charge in capacitor q = CV
= 10 x 12
= 120 μ C
On keeping liquid of dielectric constant5, capacity will becomes of 5 time.
∴ Charge q = 5 x 120
= 600 μ C

QUESTION: 5

Photons of energy 6eV are incident on a metal surface whose work function is 4eV. The minimum kinetic energy of the emitted photoelectrons will be

A.
0 eV
B.
1 eV
C.
2 eV
D.
10 eV

Solution:

QUESTION: 6

The stopping potential (V₀)

A.
Depends upon the angle of incident light
B.
Depends upon the intensity of incident light
C.
Depends upon the surface nature of the substance
D.
Is independent of the intensity of the incident light

Solution:

QUESTION: 7

A shell is fired from a canon with velocity v m/sec at an angle θ with the horizontal direction. At the highest point in its path it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon and the speed in m/sec of the other piece immediately after the explosion is

A.
3v cos θ
B.
2v cos θ
C.
D.

Solution:

Let '2m' be the mass of the cannon which is projected with velocity 'v' at an angle 'θ' with the horizontal direction
The horizontal component of the velocity of the cannon is, v_x = v cosθ.
This component remains constant
At the maximum height, the cannon has only this component as the vertical component is momentarily zero

So, momentum before exploding = 2mv cosθ
After exploding one of the masses retraces the path of the cannon backwards
This is possible on if the part has velocity '-v cosθ'
Therefore, momentum after explosion = -mv cosθ + mu
So, by conservation of momentum
2mv cosθ = -mv cosθ + mu
⇒ u = (3v cosθ) m/s

QUESTION: 8

The power factor of a series LCR circuit when at resonance is

A.
Zero
B.
0.5
C.
1.0
D.
Depends on values of L,C,R

Solution:

QUESTION: 9

Choke coil works on the principle of

A.
Transient current
B.
Mutual induction
C.
Self induction
D.
Wattless current

Solution:

QUESTION: 10

What is the de Broglie wavelength of the α-particle accelerated through a potential difference V

A.
0.287/√V
B.
12.27/√V
C.
0.101/√V
D.
0.202/√V

Solution:

QUESTION: 11

A metal plate gets heated, when cathode rays against it, due to

A.
kinetic energy of cathode rays
B.
potential energy of cathode rays
C.
linear velocity of cathode rays
D.
angular velocity of cathode rays

Solution:

QUESTION: 12

The magnetic flux of 500 micro-webers passing through a 200 turn coil is reversed in 20 x 10^-3 seconds. The average e.m.f. induced in the coil in volts is

A.
2.5
B.
5.0
C.
7.5
D.
10.0

Solution:

Induced emf in the coil
= 10 volts

QUESTION: 13

Out of the folowing statement which is NOT true?

A.
infrared radiations arise due to minor electron transitions in atoms
B.
infrared radiations are used for long distance photography
C.
sun is the natural source of infrared radiations
D.
Infrared radiations are detected by using a bolometer

Solution:

QUESTION: 14

In an oscillating LC circuit the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

A.
Q/2
B.
C.
D.
Q

Solution:

QUESTION: 15

A particle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to - K/r², where K is a constant. The total energy of the particle is

A.
K/2r
B.
- K/2r
C.
- K/r
D.
K/r

Solution:

QUESTION: 16

A long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be

A.
U/25
B.
U/5
C.
5U
D.
25U

Solution:

QUESTION: 17

The initial temperature of a body is 80ºC. If its temperature falls to 64ºC in 5 minutes and in 10 minutes to 52ºC then the temperature of surrounding will be

A.
26ºC
B.
49ºC
C.
35ºC
D.
42ºC

Solution:

QUESTION: 18

An electric lamp is marked 60 W, 220 V. The cost of kilo watt hour of electricity is Rs 1.25. The cost of using this lamp on 220 V for 8 hours is

A.
Re 0.25
B.
Re 0.60
C.
Re 1.20
D.
Re 4.00

Solution:

QUESTION: 19

An infinite long plate has surface charge density σ . As shown in the figure a point charge q is moved from A to B. Net work done by electric field is:

Solution:

QUESTION: 20

An electric dipole has the magnitude of its charge as q, and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, then force acting on it and its potential energy are respectively

A.
q.E and p.E
B.
q.E and maximum
C.
2q.E and minimum
D.
zero and minimum

Solution:

The situation is shown in adjacent figure is parallel to

∴ U = - pE cos 0 = - pE = Minimum
and the net force on the dipole is zero

QUESTION: 21

For protecting sensitive equipment from external magnetic field, it should be

A.
wrapped with insulation around it when passing current through it
B.
placed inside an iron can
C.
surrounded with Cu sheet
D.
placed inside aluminium can

Solution:

QUESTION: 22

A bar magnet of pole strength 20 A-m is divided into 4 equal parts by slicing it along lines parallel to its length and breadth, passing through centre. The pole strength of each piece is

A.
80 A-m
B.
10 A-m
C.
20 A-m
D.
40 A-m

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

When a train stops suddenly, passengers in the running train feel an instant jerk in the forward direction because

A.
The back of seat suddenly pushes the passengers forward
B.
Inertia of rest stops the train and takes the body forward
C.
Upper part of the body continues to be in the state of motion whereas the lower part of the body in contact with seat remains at rest
D.
Nothing can be said due to insufficient data

Solution:

QUESTION: 25

To impart high energy to sub atomic particles, the particle accelerator used is

A.
cyclotron
B.
synchroton
C.
linear accelerator
D.
all of these

Solution:

QUESTION: 26

A body of mass 2 kg is made to oscillate with an angular frequency 4 rad-s⁻¹ on a spring. The force constant of the spring is

A.
4 N-m⁻¹
B.
8 N-m⁻¹
C.
16 N-m⁻¹
D.
32 N-m⁻¹

Solution:

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): Air quickly leaking out of a balloon becomes cooler.
Reason(R): The leaking air undergoes adiabatic expansion. Reason(R): The leaking air undergoes adiabatic expansion.

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): Coulomb's law gives the electric field due to a distribution of charges , while Biot-Savarts law gives the magnetic field due to a current element .
Reason(R): A stationary charge generates an electric field while a current generates a magnetid field in the surrounding space.

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: 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): A particle of mass m collides with another stationary particle of mass M. If the particle m stops just after the collision, the coefficient of restitution of collisions is equal to 1.
Reason(R): Momentum of system just before and after the collision remains constant.

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

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 lens of water formed by very thin convex glass layer has lesser focal length than a double convex lens of glass.
Reason(R): Refractive index of glass is more than that of water.

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): The brightness of a light bulb in a room decreases when a heavy current appliance is switched on.
Reason(R): There will be no change in the brightness of bulb if the source is ideal.

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: 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): When a body is projected with velocity v = v₀ (where v₀ is orbital velocity) then path of the projectile is circular.
Reason(R): Gravitational force between body and the earth provides the centripetal force.

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): The resistivity of a semiconductor increases with temperature.
Reason(R): The atoms of semiconductor vibrate at larger amplitude at higher temperature, thereby increasing resistivity.

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: 34

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: 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 capacitor and a resistor are connected in series with an a.c. circuit. In this circuit current and potential difference across the resistance leads potential difference across the capacitor by and angle π/2.
Reason(R): In C-R circuit voltage lags behind the current by phase angle which depends on the value of C and R.

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): Any internal forces in the system are included while considering force for Newton's second law of motion.
Reason(R): The force in the law stands for the net force on the system.

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: 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): In a system with damping effect, 100% of the total energy can be the maximum potential energy.
Reason(R): Minimum potential energy will be treated as zero point energy and will also be non-zero.

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: 38

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): Air close to the equator of our earth has an eastward speed.
Reason(R): Rotation of the earth modifies the path of the air molecules.

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): The maximum frequency of the photon produced by the union of a positron and an electron is 1.2x10²⁰Hertz.
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: 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): A closed pipe produces only old harmonics, while an open pipe produces only even harmonics.
Reason(R): Closed end of the pipe reflects the longitudinal wave like a rigid boundary while the open end reflects the longitudinal wave like a free boundary .

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): Time period of a hollow ball will be more than that of a solid ball of same radius.
Reason(R): Time period is independent of mass or distribution but on l , where l is the distance between the point of suspension and the centre of the bob.

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): Costly wrist watches and other instruments are enclosed in a soft-iron case to protect it from external field.
Reason(R): Iron-case is used as magnetic screening or shielding.

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: 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): There is no charge in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it.
Reason(R): The force on a moving charge acts parallel to its direction of motion.

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

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): An astronaut accidentally gets separated out of his small spaceship accelerating in intersteller space at a constant rate of 90ms⁻². The acceleration of the astronaut at the instant he is outside the spaceship is more than 90ms⁻².
Reason(R): More forces act on the astronaut the moment he is out of spaceship.

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: 45

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): When a light wheel of mica is placed in the path of cathode rays, it starts rotating.
Reason(R): Cathode rays produce heat when they strike a material surface.

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): When a beetle moves along the sand within a few centimetres of scorpion, the scorpion immediately turns and dashes towards it.
Reason(R): When a beetle disturbs the sand, it send pulses along the sand's surface through which scorpion detects the beetle.

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:

QUESTION: 48

A stone thrown at an angle θ to the horizontal reaches a maximum height h. The time of flight of the stone is

A.
√2h sin θ/g
B.
2√2h sin θ/g
C.
2√2h/g
D.
√2h/g

Solution:

QUESTION: 49

A double convex lens of glass μ = 1.5 is immersed in water μ = 4/3 . If the focal length of the lens in air is ′ f ′ . Focal length in water is

A.
f
B.
f/2
C.
2 f
D.
4 f

Solution:

QUESTION: 50

In a spectrometer experiment three prisms A, B, C with same angle of prism but of different materials of refractive indices μA = 1.33 , μB = 1.55 and μC = 1.44 are used. The corresponding angles of minimum deviation D_A , D_B , D_C measured will be such that

A.
D_A > D_B > D_C
B.
D_A < D_B < D_C
C.
D_A < D_C < D_B
D.
D_B> D_A > D_C

Solution:

QUESTION: 51

The dark lines in the solar spectrum are due to

A.
Absorption of certain wavelengths by elements present in the outer layer
B.
Absence of certain elements in the sun
C.
Black-body radiation from the sun
D.
Scattering of light

Solution:

QUESTION: 52

Consider the two following statements A and B and identify the correct choice even in the answers (A) Duddells thermo-galvanometer is suitable to measure direct current only (B) Thermopile can measure temperature differences of the order of 10⁻³ºC

A.
Both A and B are true
B.
Both A and B are false
C.
A is true but B is false
D.
A is false but B is true

Solution:

QUESTION: 53

Electrical conductivity of a semiconductor

A.
Decreases with the rise in temperature
B.
Increases with the rise in temperature
C.
Does not change with the rise in its temp.
D.
First increases and then decreases with the rise in its temperature

Solution:

QUESTION: 54

The transistors provide good power ampli-fication when they are used in

A.
common collector configuration
B.
common emitter configuration
C.
common base configuration
D.
none of these

Solution:

QUESTION: 55

If the acceleration due to gravity is 10ms⁻² and the units of length and time are changed in kilometer and hour respectively, the numerical value of the acceleration is

A.
360000
B.
72,000
C.
36,000
D.
129600

Solution:

QUESTION: 56

Dimensional formula for torque is

A.
L²MT⁻²
B.
L⁻¹MT⁻²
C.
L²MT⁻³
D.
LMT⁻²

Solution:

QUESTION: 57

A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is

A.
Zero
B.
π
C.
π/2
D.
2 π

Solution:

QUESTION: 58

Inverse square law of intensity (illuminance) is valid for

A.
plane wavefront
B.
conical wavefront
C.
spherical wavefront
D.
cylindrical wavefront

Solution:

QUESTION: 59

Soap bubble looks coloured due to

A.
dispersion
B.
reflection
C.
interference
D.
any one of these

Solution:

QUESTION: 60

Under the action of a force, a 2 kg body moves such that its position x as a function of time is given by x = t²/3, where x is in meters and t is in sec. The work done by the force in the first two seconds is

A.
1600 J
B.
1.0 J
C.
16 J
D.
1.6 J

Solution:

QUESTION: 61

The number of atoms contained in 11.2 L of SO₂ at S.T.P. are

A.
3/2 x 6.02 x 10²³
B.
2 x 6.02 x 10²³
C.
6.02 x 10²³
D.
4 x 6.02 x 10²³

Solution:

QUESTION: 62

Methanol is manufactured by

A.
the reaction of hydrogen and carbon dioxide
B.
fermentation of molasses
C.
cracking of ethanol
D.
the reaction of hydrogen and carbon monoxide

Solution:

QUESTION: 63

2 g of oxygen contains number of atoms equal to that in

A.
0.5 g of hydrogen
B.
4 g of sulphur
C.
7 g of nitrogen
D.
2.3 g of sodium

Solution:

QUESTION: 64

The most reactive compound for electrophilic nitration is

A.
Benzene
B.
Nitrobenzene
C.
Benzoic acid
D.
Toluene

Solution:

QUESTION: 65

Toluene on oxidation with chromyl chloride produces

A.
Benzoic acid
B.
Benzaldehyde
C.
Chlorobenzene
D.
None of these

Solution:

QUESTION: 66

A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group towards o- and p-positions is

A.
― NH₂
B.
― Cl
C.
― NO₂
D.
― C₂H₅

Solution:

QUESTION: 67

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: 68

Freon is used as a

A.
catalyst
B.
oxidation
C.
refrigerants
D.
both 2 and 3

Solution:

QUESTION: 69

Which of the following is soluble in water?

A.
CS₂
B.
C₂H₅OH
C.
CCl₄
D.
CHCl₃

Solution:

QUESTION: 70

The rate of a first order reaction is 1.5 X 10⁻²mol-L⁻¹-min⁻¹ at 0.5M concentration of the reactant. The half -life of the reaction is

A.
7.33 min
B.
0.383 min
C.
23.1 min
D.
8.73 min

Solution:

QUESTION: 71

The units for the rate constant of first order reaction is

A.
s⁻¹
B.
mol L⁻¹ s⁻¹
C.
mol s⁻¹
D.
L mol⁻¹ s⁻¹

Solution:

QUESTION: 72

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: 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): Ionisation energy of F is numerically same to that of its electron affinity but with different sign .
Reason(R): Ionisation energy and electron affinity both depend upon size and effective nuclear charge.

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 true but Reason is false.

Solution:

QUESTION: 75

Calculate Δ H in KJ for the following reaction C(s) + O₂g → CO₂g Given that
H₂O (g) + C (g) → CO (g) + H₂ (g), ΔH = +131kJ
CO (g) + → CO₂ (g), ΔH = -282kJ
H₂ (g) + → H₂O (g), ΔH = -242kJ

A.
− 393
B.
+ 393
C.
+ 655
D.
− 655

Solution:

QUESTION: 76

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 true.

Solution:

QUESTION: 77

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

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): Hard water does not form lather with soap.
Reason(R): In hard water, the sodium stearate of soap changes to the corresponding calcium magnesium salt which precipitates out.

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: 79

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: 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

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 true but Reason is false.

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): Hydrogen has only one elctron in its orbit but it produces several spectral lines.
Reason(R): There are many excited energy levels available.

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: 83

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): Benzene reacts with CH₃COCl to form chlorobenzene in presence of AlCL₃.
Reason(R): Chlorination is an electrophilic substitution reaction.

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: 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): One can safely use phenolphthalein as indicator between the titration of weak acid and strong base.
Reason(R): Phenolphthalein indicator, pH range is 4.2-6.0.

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): According to the principle of common ion effect , the solubility of HgI₂ is expected to be less in an aqueous solution of KI than in water. but HgI₂ dissolves in an aqueous solution of KI to form a clear solution.
Reason(R): Iodine ion, I^-, is highly polarisable.

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: 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): NaCl + AgNO₃ → AgCl + NaNO₃ is an ionic reaction .
Reason(R): For an ionic reaction , the sum of total ion charges on each side, as well as the number of each kind of atom on each side, must balance.

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: 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

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: 90

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): La(OH)₂ is more basic than La(OH)₃.
Reason(R): The basic character of oxides and hydroxides decreases from La(OH)₃ to Lu(OH)₃.

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

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 hydrogens of the CH₂^- group of 1,3-cyclopentadiene are acidic and this hydrocarbon is nearly 10³⁰ times more acidic than ordinary alkanes.
Reason(R): In cyclopentadienyl anion, all five cabons are equivalent as demonstrated by labelling experiments.

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: 92

The oxidation no. of nitrogen in NaNO₂ is

A.
-3
B.
+3
C.
-5
D.
+5

Solution:

The formal oxidation state of the nitrogen atom in a nitrite is +3. This means that it is can be either oxidised to oxidation states +4 and +5 or reduced to oxidation states as low as -3.

QUESTION: 93

An electrolytic cell contains a solution of Ag₂SO₄ and have platinum electrodes. A current is passed until 1.6 gm of O₂ has been liberated at anode. The amount of silver deposited at cathode would be

A.
107.88 gm
B.
1.6 gm
C.
0.8 gm
D.
21.60 gm

Solution:

Wt. of O₂ = 1.6 g; Wt. of Ag deposited = ? ;
Eq. Wt. of oxygen = 8, Eq. Wt. of Ag = 108
We know :

QUESTION: 94

Real gases deviate from ideal behaviour because ,the molecules

A.
are colourless
B.
attract each other
C.
contain covalent bonds
D.
show Brownian movement

Solution:

QUESTION: 95

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: 96

Which of the following metal can be easily cut with a knife?

A.
sodium
B.
barium
C.
aluminium
D.
magnesium

Solution:

QUESTION: 97

Which one of following properties of alkali metals increases in magnitude as the atomic number rises?

A.
Ionic radius
B.
Melting point
C.
Electronegativity
D.
First ionization energy

Solution:

QUESTION: 98

Microcosmic salt is

A.
Na(NH₄)HPO₄.4H₂O
B.
Na(NH₄).H₂O
C.
Na(NH₃)HPO₄.4H₂O
D.
K(NH₄)HPO₃.2H₂O

Solution:

QUESTION: 99

On boiling an aqueous solution of KClO₃ with I₂ the prodcuts obtained are

A.
KClO₃ + Cl₂
B.
KCl + I₂O₅
C.
KIO₄ + Cl₂
D.
No reaction takes place

Solution:

QUESTION: 100

One mol of magnesium nitride on reaction with an excess of water gives

A.
One mole of ammonia
B.
Two mole of ammonia
C.
Two mole of nitric acid
D.
One mole of nitric acid

Solution:

QUESTION: 101

Which of the following is formed when magnesium reacts with nitrogen?

A.
MgN₂
B.
Mg₂N
C.
Mg₂N₂
D.
Mg₃N₂

Solution:

QUESTION: 102

Precipitation takes place when the ionic product

A.
equals the solubility product
B.
exceeds the solubility product
C.
is less than the solubility product
D.
is almost zero

Solution:

QUESTION: 103

Which of the following is a strong electrolyte?

A.
NaCl
B.
Na(OH)₂
C.
H₃PO₄
D.
CH₃COOH

Solution:

QUESTION: 104

Which of the following is a method of converting a ketone to hydrocarbon with same number of carbon atoms?

A.
Clemensen's reduction
B.
Reimer-Tiemann reaction
C.
Cannizzaro's reaction
D.
Rosenmund's reaction

Solution:

QUESTION: 105

Which of the following reactant in the presence of AlCl₃ gives acetophenone?

A.
benzene and acetone
B.
phenol and acetone
C.
phenol and AcOH
D.
Benzene and AcCl

Solution:

QUESTION: 106

The dissociation constant is highest for

A.
C₆H₅OH
B.
CH₃C≡CH
C.
CH₃NH₃⁺Cl⁻
D.
C₆H₅CH₂OH

Solution:

QUESTION: 107

Following stepis:

A.
chain initiation
B.
chain propagation
C.
chain termination
D.
chain disproportionation

Solution:

QUESTION: 108

Why only As⁺³ gets precipitated as As₂S₃ and not Zn⁺² as ZnS when H₂S is passed through an acidic solution containing As⁺³ and Zn⁺²?

A.
Solubility product of As₂S₃ is less than that of ZnS
B.
Enough As⁺³ are present in acidic medium
C.
Zinc salt does not ionise in acidic medium
D.
Solubility product changes in presence of an acid

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.HNO₃forms in presence of:

A.
conc.H₂SO₄
B.
Fe
C.
FeBr₃
D.
AlCl₃

Solution:

QUESTION: 111

p-type silicon is formed by adding a minute amount of an element with

A.
six valence electrons
B.
four valence electrons
C.
five valence electrons
D.
three valence electrons

Solution:

QUESTION: 112

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: 113

Quartz is a crystalline variety of

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

Solution:

QUESTION: 114

When molten Zn is cooled to solid, it assumes HCP structure. Then the number of nearest neighbours of Zn atoms will be

A.
4
B.
6
C.
8
D.
12

Solution:

QUESTION: 115

If 480 ml of 1.5 M solution and 520 mL of 1.2 M solution is mixed, then molarity of the final solution is

A.
1.20 M
B.
1.34 M
C.
1.50 M
D.
2.70 M

Solution:

QUESTION: 116

Liquid benzene burns in oxygen according to following equation.

2 C₆H₆(l) + 15 O₂(g) → 12 CO₂(g) + 6H₂O(g)

How many litres of oxygen are required for complete combustion of 39 gram of liquid benzene ?

A.
11.2
B.
22.4
C.
42
D.
84

Solution:

QUESTION: 117

Which of the following is not a colligative property?

A.
optical activity
B.
osmotic pressure
C.
elevation in boiling point
D.
relative lowering of vapour pressure

Solution:

QUESTION: 118

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: 119

Who was awarded Nobel Prize in chemistry for discovering laws of osmotic pressure for solution?

A.
Van't Hoff
B.
Pauling
C.
Seaberg
D.
Berkeley

Solution:

QUESTION: 120

Copper is extracted from copper pyrites ore by heating in a blast furnace. The method is based on the principle that

A.
Copper has more affinity for oxygen than sulphur at high temperature
B.
Iron has less affinity for oxygen than sulphur at high temperature
C.
Sulphur has less affinity for oxygen at high temperature
D.
Copper has less affinity for oxygen than sulphur at high temperature

Solution:

QUESTION: 121

Kupffer cells are involved in

A.
phagocytosis
B.
sensory activity
C.
toxin secretion
D.
enzyme synthesis

Solution:

QUESTION: 122

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 honey bee queen copulates only once in her life time.
Reason(R): The honey bee queen can lay fertilized as well as unfertilized eggs.

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:

Queen is the only fertile female in beehive, having immensely developed ovaries. She lives for several successive years laying about 2000 or more eggs a day and upto 1,500000 eggs during her life time. The queen has a remarkable capacity of controlling the fertilization of its eggs. A fertilized egg is laid in a worker or queen cell or honey comb, while an unfertilized egg in a drone cell, the later developes parthenogenetically. The queen mates only once in lifetime. The sperms stored in her spermatheca fertilize her eggs as long as she lives.

QUESTION: 123

Flightless bird cassoway is native of

A.
Mauratius
B.
Indonesia
C.
New Zealand
D.
Australia

Solution:

QUESTION: 124

Which of these feeds upon dead organic matter with its maxillae picking up the food particles and bringing these to mandibles for mastication ?

A.
Mosquito
B.
Cockroach
C.
Earthwarm
D.
Honeybee

Solution:

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): Dormancy is required for good survival of seeds.
Reason (R): Dormant seeds serve the major part of our food.

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): The seeds have two separable seed coats, testa and tegmen.
Reason (R): Inner to testa is present in the embryo.

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 Reason(R) just below it. Read the Statement carefully and mark the correct answer-
Assertion(A): Leaves are present in different planes of branch.
Reason (R): A branch possesses leaf at terminal position.

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: 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): Flowering in plants occurs only when the length of dark period is suitable.
Reason (R): The flowers are the receptors of the photoperiodic stimulus.

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: 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): Aldosterone is a steroid hormone and is important in the control of sodium and potassium ion concentration in mammals.
Reason(R): It upgrades sodium ion concentration in the ECF by promoting reabsorption of sodium ions from renal tubules and excretion of postassium ions in urine.

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:

Aldosterone is a hormone that increases the reabsorption of sodium ions and water and the release (secretion) of potassium ions in the distal convoluted tubules of the kidneys. This increases blood volume and, therefore, increases blood pressure.
Acting on the nuclear mineralocorticoid receptors (MR) within the principal cells of the distal tubule and the collecting duct of the kidney nephron, it upregulates and activates the basolateral Na⁺ or K⁺ pumps, stimulating ATP hydrolysis leading to phosphorylation of the pump and a conformational change in the pump exposes the Na⁺ ions to the outside. The phosphorylated form of the pump has a low affinity for Na⁺ ions, hence reabsorbing sodium (Na⁺) ions and water into the blood, and secreting potassium (K⁺) ions into the urine. Aldosterone stimulates uptake of K⁺ into cells.Aldosterone stimulates Na⁺ and water reabsorption from the gut salivary and sweat glands in exchange for K⁺. Aldosterone stimulates H⁺ secretion by intercalated cells in the collecting duct, regulating plasma bicarbonate (HCO3^-) levels and its acid/base balance.

QUESTION: 130

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): Rhoeo leaves contain anthocyanin pigments in epidermal cells.
Reason(R): Anthocyanins are accessory photosynthetic pigments.

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:

Anthocyanin is a colouring pigment of certain higher plants that imparts a bluish or reddish colour.
Rhoeo leaves contain anthocyanin pigments in epidermal cells.

QUESTION: 131

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): Totipotency can be easily demonstrated in plant cells.
Resaon (R): In higher animals it has not yet been experimentally proved.

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.
Assertion is true but Reason is 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): Water absorption is reduced by lowering O₂ tension.
Reason (R): The accumulation of CO₂ reduces water absorption.

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: 133

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): Auxins are found in the growing tips of the plant.
Reason (R): The concentration of auxins is highest at the tip of the root.

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: 134

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 ionizing radiations can have direct effect on chromosomes. They may directly break chromosomes or alter one of the DNA bases or indirectly may initiate a chain of chemical reactions. The biological effect also depends on the kind of cell and stage of nuclear cycle.

QUESTION: 135

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): Unisexual flowers have separate male and female flowers.
Reason (R): Both monoecious or dioecious plants have unisexual flowers.

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: 136

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): Old age is not an illness. It is a continuation of life with decreasing capacity for adaptation.
Reason(R): Cessation of mitosis is a normal genetically programmed event.

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:

Old age is the result of ageing or senescence which may be defined as the progressive deterioration in structure and function of the body cells, tissues, organs and organ systems of the organism with their advancing age.In old age the body's immune system loses its ability to effectively deal with the antigens. This reduces the resistance as well as adaptation of the body.
Cessation of mitosis is not as such a genetically programmed event. During ageing, there is a decrease in multiplication of cells though it differs in various tissues.

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): Organ transplantation patients are given immunosuppressive drugs.
Reason(R): Transplanted tissue has antigens which stimulate the specific immune response of the recipient.

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 an organ, such as a liver, heart or kidney, is transplanted from one person into another , the immune system of the recipient triggers the same response against the new organ that it would have against any foreign material, setting off a chain of events that can damage the transplanted organ. This process is called rejection. Acute rejection can occur rapidly , or chronic rejection over a long period of time . Rejection can occur despite close matching of the donated organ and the transplant patient. Immunosuppressant drugs greatly decrease the risks of rejection, protecting the new organ and preserving its function. These drugs act by blocking the recipient's immune system so that it is less likely to react against the transplanted organ. A wide variety of drugs are available to achieve this aim but work in different ways to reduce the risk of rejection.
Tissues that are antigenitically similar are said to be histocompatible such tissues do not induce an immunologic response that leads to graft rejection. Tissues displaying significant antigenic differences are histoincompatible; such tissues induce immune response leading to tissue rejection. Antigens that participate in graft rejection are called as transplantation or histocompatibility antigens. The blood group antigens are important in transplantation. The term major histocompatibility system is applied to a system of cell antigens that exert a decisive influence on the fate of allografts. The major antigen system in human beings is the human leucocytes antigen (HLA) system.

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): Cyclic pathway of photosynthesis first appeared in some eubacterial species.
Reason(R): Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.

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:

Cyclic pathway of photosynthesis appeared for the first time in some Eubacterial species. It is supposed to be the first evidence of production of ATP in the presence of light.
During non-cyclic photophosphorylation photolysis of water takes place. Under the influence of light energy and the catalytic action of chlorophyll, water, a substance of low energy value, is split into oxygen and hydrogen. Oxygen is used in the chloroplast. Non-cyclic photophosphorylation is the only natural process which adds molecular oxygen to the atmosphere.

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): The impbalance in concentration of Na⁺ , K⁺ and proteins generates resting potential.
Reason (R): To maintain the unequal distribution of Na⁺ and K⁺ ,the neurons use electrical 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: 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): Phloem translocates mostly carbohydrates.
Reason (R): Glucose is the most translocated carbohydrates.

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: 141

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): Generally, a woman does not conceive during the lactation period.
Reason(R): The hormone 'prolactin' initiates and maintains lactation in a postpartum woman.

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:

Generally a woman does not conceive during the lactation period. LActation stimulates prolactin secretion and there is evidence that prolactin inhibits GnRH secretion and antagonizes the action of gonadotropins on the ovaries. Ovulation is inhibited and the ovaries are inactive so estrogen and progestrone output falls to low levels.Only 5 to 10 % chances of getting pregnant are there during lactation period.
Prolactin is a protein hormone of the adenohypophysis of the pituitary gland that induces and maintains lactation in the postpartum mammalian female .

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): Replication and transcription occur in the nucleus but translation occurs in the cytoplasm.
Reason(R): mRNA is transferred from the nucleus into the cytoplasm where ribosomes and amino acid are available for protein synthesis.

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:

DNA replication is the process of forming carbon copy of DNA whereas transcription is the formation of RNA over DNA template.DNA replication and transcription takes place in nucleus as the required material DNA and RNA are present in the nucleus.
During transcription mRNA take the coded information from DNA to the cytoplasm where translation takes place. Translation is the process of protein synthesis. It is separated from transcription in both space and time. It prevents the intermixing of raw materials, protect DNA from respiratory enzymes and ribosomal machinery from nuclease.

QUESTION: 143

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): Growth rings are also called as annual rings.
Reason (R): Generally growth ring is formed in each year.

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

Why carbohydrates are more effiecient in providing energy than fats and proteins?

A.
They have less oxgyen content
B.
They have R.Q. infinity due to less CO₂
C.
Because of more O₂ content they require less molecular oxygen to provide energy
D.
They are easily consumed

Solution:

QUESTION: 145

In ABO system of blood grouping, transfusion is not possible from

A.
A to AB
B.
B to AB
C.
O to AB
D.
A to O

Solution:

QUESTION: 146

The major link in transfer of chemical energy is ATP-ADP system was first described by Lipman in-

A.
1940
B.
1950
C.
1960
D.
1970

Solution:

QUESTION: 147

Which of the following is true of the small intestine?

A.
Site of carbohydrate and protein but NOT fat digestion
B.
Site of the majority of water absorption in the GI tract
C.
First site of protein hydrolysis
D.
None of the above

Solution:

QUESTION: 148

Hydrogen bonds between cytosine and guanine are :

A.
1
B.
3
C.
2
D.
4

Solution:

QUESTION: 149

Which of the following can fix atmospheric nitrogen?

A.
Albugo
B.
Cystopus
C.
Saprolegnia
D.
Anabaena

Solution:

QUESTION: 150

Which of the following pair is incorrect?

A.
organochlorine - DDT
B.
carbamate - carbaryl
C.
pyrethroid - atrazine
D.
organophosphate - malathion

Solution:

QUESTION: 151

Cardamoms are ripe dried fruits of

A.
Piper nigrum
B.
Dolichos lablab
C.
Ficus religiosa
D.
Eletteria cardamonum

Solution:

QUESTION: 152

Who is considered as ancestor of modern apes?

A.
Dryopithecus
B.
Ramapithecus
C.
Oriopithecus
D.
None above

Solution:

QUESTION: 153

In repressible or negative operon

A.
Corepressor binds with inducer
B.
Corepressor binds with aporepressor
C.
Corepressor does not bind with repressor
D.
cAMP has negative effect

Solution:

QUESTION: 154

Wobble hypothesis was proposed by

A.
Holley
B.
Nirenberg
C.
Khorana
D.
Crick

Solution:

QUESTION: 155

Which of the following traits of garden pea studied by Mendel was a recessive feature ?

A.
Green seed colour
B.
Green pod colour
C.
Round seed shape
D.
Axial flower position

Solution:

QUESTION: 156

A late acting dominant disorder is

A.
Tay-sach's disease
B.
Polydactyly
C.
Huntington's chorea
D.
Phenylketonuria

Solution:

QUESTION: 157

Universal blood donor group is

A.
A
B.
B
C.
AB
D.
O

Solution:

QUESTION: 158

Basis of vaccination was discovered by

A.
Salk
B.
Kohler
C.
Landsteiner
D.
Pasteur

Solution:

QUESTION: 159

Interferon suppresses the pathogenicity of

A.
Bacteria
B.
Protozoa
C.
Viruses
D.
Helminths

Solution:

QUESTION: 160

Rejection of transplanted organ is due to

A.
B-cells
B.
Eosinophils
C.
T-cells
D.
Neutrophils

Solution:

QUESTION: 161

Cauliflory is

A.
Production of new plants from cauline buds
B.
Formation of flowers from old stem
C.
Development of flowers on young branches
D.
Clustering of flowers

Solution:

QUESTION: 162

The hereditary material present in the bacterium E. coli is

A.
RNA
B.
RNA-complex
C.
single-stranded DNA
D.
double-standed DNA

Solution:

QUESTION: 163

Depolarization of a nerve cell is caused by

A.
the sodium potassium pump
B.
Sodium ions entering the cell
C.
The opening of the potassium Gates
D.
A return of membrane potential to -60mV

Solution:

QUESTION: 164

Mineral present in cytochrome is

A.
Fe
B.
Cu
C.
Mg
D.
Mn

Solution:

QUESTION: 165

Sex factor of bacteria is

A.
RNA
B.
Sex pili
C.
F-factor
D.
Chromosome replicon

Solution:

QUESTION: 166

The law of limiting factors for photosynthesis was enunciated by

A.
R.Hill
B.
Calvin
C.
Krebs
D.
Blackman

Solution:

QUESTION: 167

Which is not required for synthesis of carbohydrates

A.
Chlorophyll
B.
Water
C.
Nitrogen
D.
Carbon dioxide

Solution:

QUESTION: 168

If by radiation all nitrogenase enzymes are inactivated, then there will be no

A.
fixation of nitrogen in legumes
B.
conversion of nitrate to nitrite
C.
fixation of atmospheric nitrogen
D.
conversion of ammonium to nitrate

Solution:

QUESTION: 169

A living mechanical tissue having cellulosic wall thickening is

A.
Sclerenchyma
B.
Collenchyma
C.
Parenchyma
D.
Aerenchyma

Solution:

QUESTION: 170

Angular collenchyma occurs in

A.
Cucurbita
B.
Helianthus
C.
Althaea
D.
Salvia

Solution:

QUESTION: 171

Occurrence of water blooms in a lake indicates

A.
Excessive nutrient availability
B.
Nutrient deficiency