AIIMS Full Mock Test 8


200 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Full Mock Test 8


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This mock test of AIIMS Full Mock Test 8 for NEET helps you for every NEET entrance exam. This contains 200 Multiple Choice Questions for NEET AIIMS Full Mock Test 8 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Full Mock Test 8 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Full Mock Test 8 exercise for a better result in the exam. You can find other AIIMS Full Mock Test 8 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

In an induction coil, the secondary e.m.f. is

Solution:
QUESTION: 2

The de-Broglie wavelength of an electorn having 80 eV of energy is nearly (1eV = 1.6 x 10−19 J , Mass of the electron = 9 x 10−31K g , planck′s constant = 6.6 x 10−34J − sec

Solution:
QUESTION: 3

Equivalent capacitance between A and B is

Solution:
QUESTION: 4

An electron and a proton have same de-Broglie's wavelength. The kinetic energy of an electron is

Solution: As electron and proton have same de Broglie wavelength then the electron must have more more velocity as compared to proton because there momentum will be same Nd mass of proton is greater than mass of electron so.....we know k.E =1/2mv^2 or 1/2(momentum)*v....hence velocity of electron will be more that proton so...k.Eof electron will be more than proton...
QUESTION: 5

A heavy steel ball of mass greater than 1 kg moving with a speed of 2 m sec⁻1 collides head on with a stationary ping-pong ball of mass less than 0.1 gm. The collision is elastic. After the collision the ping-pong ball moves approximately with speed

Solution:
QUESTION: 6

A photon in motion has a mass

Solution:
QUESTION: 7

Consider the two following statements A and B and identify the correct choice given in the answers;
(A) In photovoltaic cells the photoelectric current produced is not proportional to the, intensity of incident light.
(B) In gas filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation.

Solution:
QUESTION: 8

In a Wheatstone's bridge, all the four arms have equal resistance R. If resistance of the galvanometer arm is also R, then equivalent resistance of the combination is

Solution:
QUESTION: 9

A particle of mass m at rest decays into two masses m₁ and m₂ with non-zero velocities. The ratio of de-Broglie wavelengths of the masses λ₁/λ₂ is

Solution:
De broglie wave length is given by λ=h/p
where h is planks constant and p is  momentum. 
Now the mass M was at rest initially so from the momentum conservation 
we can write that 
p1=p2
Since the momentum is equal, the de broglie wavelength will be equal.
Hence answer (A) is corect option. 
QUESTION: 10

In a D.C. motor induced e.m.f will be maximum

Solution:
QUESTION: 11

In an a.c. circuit, the current

Solution:
QUESTION: 12

An inductance L having a resistance R is connected to an alternating source of angular frequency ω. The quality factor (Q) of the inductance is L/R

Solution:
QUESTION: 13

What is the value of inductance L for which the current is a maximum in series LCR circuit with C = 10 μF and ω = 1000s−1 ?

Solution:
QUESTION: 14

A doubly ionised He+2 atom travels at right angles to a magnetic field of induction 0.4T at a velocity of 105ms−1 describing a circle of radius r. A proton travelling with same speed in the same direction in the same field will describe a circle of radius

Solution:
QUESTION: 15

The displacement current arises when electric field in a region

Solution:
QUESTION: 16

A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10 volt. The potential at the centre of the sphere is

Solution:
QUESTION: 17

A body of mass 2 kg is thrown up vertically with kinetic energy of 490 joules. If the acceleration due to gravity is 9.8 m/s2, then the height at which the K.E. of the body becomes half its original value is given by

Solution:
QUESTION: 18

A light and a heavy body have equal kinetic energy. Which one has a greater momentum ?

Solution:
QUESTION: 19

The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by

Solution:
QUESTION: 20

A 10 Ω electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts.

Solution:
QUESTION: 21

In a deflection magnetometer experiment in tan A position, a short-bar magnet placed at 18 cm from the centre of the compass needle produces a deflection of 30º . If another magnet of same length but 16 times pole strength as that of first magnet is placed in tan B position at 36cm, the deflection will be

Solution:
QUESTION: 22

In a deflection magnetometer experiment the deflections produced separately by two short bar magnets kept at the same distance are 45º and 30º . Then the ratio of the magnetic moments of the two magnets is

Solution:

For deflection magnetometer

QUESTION: 23

A cube is subjected to a uniform volumatric compression. If side of cube decreases by 1%, then its bulk strain is

Solution: The answer should be 0.03.as per the question side of cube decreased by 1% or by 0.01.since we know bulk strain=change in volume divided by original volume. as volume of cube =cube of side of square. hence bulk strain=change in volume by original volume = 3*(change in side by original side) =0.03
QUESTION: 24

The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is

Solution:
QUESTION: 25

A sample of wood decayed to 1/16 of its original value. What is the number of T1/2 ?

Solution:
QUESTION: 26

A particle execute simple harmonic motion with a frequency f. The frequency with which its kinetic energy oscillates is

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): In a uniform circular motion angle between velocity vector and acceleration vector is always π/2 .
Reason(R): For any type of motion, angle between acceleration and velocity is always π/2 .

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): In an organ pipe the antinode is formed exactly at the open end, but slightly outside.
Reason(R): Vibrations of the air particles in the pipe are not restricted to the open end but occur outside also.

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): 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 .

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): Two identical charged particles enter a uniform magnetic field with speeds v1 and v2 (where v2 > v1) , then they move along circles of radii (r1 > r2) respectively .
Reason(R): The radius of the path is proportional to the momentum of the charged particle.

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): Interference can happen in sound waves.
Reason(R): In Quincke's tube, interference is present due to initial phase difference as well as the phase difference due to path difference.

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): The limits of a derived quantity in terms of base quantities is called dimensional formula and raised powers on the base quantities are called dimensions
Reason (R): Dimensions does not depend on the units of quantity

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): A system of cylinder with non-accelerated motion of piston and larger temperature gradient is called a quasistatic process.
Reason(R) In quasi-static processes, the pressure and temperature of the surrounding and the cylinder are the same.

Solution:
QUESTION: 34

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 workdone in pushing a block is more than the work done in pulling the block in a rough surface.
Reason(R): In the pushing condition normal reaction is more.

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): Speed of light in water is less than the speed in air.
Reason(R): Refractive index of water is greater than one .

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): A body of mass m1 collides head on elastically with another stationary body of mass m2. After the collision, velocity of mass m2 is maximum, when m1<<m2.
Reason(R): Velocity of second body is always maximum, when its mass m2 is greater than mass of the hitting body.

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 the tempered scale, the ratio of frequencies between all successive notes is 1.059.
Reason (R): In equal tone temperament, the octave is divide into twelve exactly equal intervals.

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): Potential energy is defined for only conservative forces.
Reason(R):

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): By roughening the surface of glass sheet its transparency can be reduced.
Reason(R): Glass sheet with rough surface absorbs more light.

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): Radioactive decay can be accelerated by increasing the temperature.
Reason(R): Energy ∝ Temperature.

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): Out of galvanometer, ammeter and voltmeter resistance of ammeter is lowest and resistance of voltmeter is highest.
Reason(R): An ammeter is connected in series and a voltmeter is connected in parallel in a circuit.

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

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): Radio waves are not electomagnetic waves.
Reason(R): Basic source of electromagnetic wave is an accelerated charge .

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): Penetrating power of β-particles is more compared to α-particles.
Reason(R): Ionising power of β-particles is more compared to α-particles.

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): Two S.H.M's along x and y axes with angular frequency ratio ω1 : ω2 = 1 : 2 with same amplitude results in a parabolic path on super-position.
Reason(R): The x and y displacements are related as y∝x2 .

Solution:

The equations of simple harmonic motions of the particle in X and Y directions are
x = a cos ωt .....(i)
y = a sin 2 ωt .....(ii)
From (i), cos ωt = x/a
and sin ωt  
From (ii), y = 2 a sin ωt cos ωt

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): Rise of water level in capillary tube should be accounted vertically and not on the length of the pipe in which it has rised.
Reason(R): More the radius, the rise will decrease for different liquids tested.

Solution:
QUESTION: 47

A motor boat is travelling with a speed of 3.0 m/sec. If the force on it due to a water flow is 500 N, the power of the boat is

Solution:
QUESTION: 48

The maximum range of a gun on horizontal terrain is 16 km. If g = 10 m/s2. What must be the muzzle velocity of the shell

Solution:
QUESTION: 49

The far point of a myopic eye is 1.5 m. To correct this defect of the eye, the power of lens is

Solution:
QUESTION: 50

The splitting of white into several colours on passing through a glass prism is due to

Solution:
QUESTION: 51

In an intrinsic semiconductor the Fermi level is

Solution:
QUESTION: 52

Single from a remote control to the device operated by it travels with the speed of

Solution:
QUESTION: 53

Which of the following, when added as an impurity atom in the silicon, produces n-type semiconductor?

Solution:
QUESTION: 54

Thomson coefficient of a conductor is 10μV/K. The two ends of it are kept at 50ºC and 60ºC respectively. Amount of heat absorbed by the conductor when a charge of 10 C flows through it is

Solution:
QUESTION: 55

Which of the following pairs is related as in work and force ?

Solution:
QUESTION: 56

Universal time is based on

Solution: C is the correct answer because as we know that this cesium clock is a kind of an atomic clock which gives a particular, accurate , sure time. which works on the base of vibrations of cesium atom.
QUESTION: 57

If the ratio of intensities of two waves causing interference be 9:4, then the ratio of maximum and minimum intensities will be

Solution:
QUESTION: 58

Laser light is considered to be coherent as it consists of

Solution:
QUESTION: 59

If wavelength of a photon is 6000 Å, then energy of this photon will be

Solution:
QUESTION: 60

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

Solution:
QUESTION: 61

When wine is put in air, it becomes sour due to

Solution:
QUESTION: 62

Point out the incorrect statement about resonance?

Solution:
QUESTION: 63

How many moles of Helium gas occupy 22.4 L at 0ºC at 1 atm. pressure?

Solution:
QUESTION: 64

Toluene on oxidation with dil. HNO₃ gives

Solution:
QUESTION: 65

What is the end product of nitration of toluene?

Solution:
QUESTION: 66

Which of the following gas changes lime water in milky colour?

Solution:
QUESTION: 67

which of the following shows electrical conduction?

Solution:
QUESTION: 68

Which of the following is formed when toluene reacts with fuming nitric acid?

Solution:

Nitration of toluene using fuming HNO3 and conc. H2SO4 gives Trinitrotoluene

QUESTION: 69

Which of the following molecule is not linear?

Solution:
QUESTION: 70

In the reaction 4NH₃(g) + 5O₂(g) → NO(g) + 6H₂O(l), when 1.0 mole of ammonia and 1.0 mole of O₂ are made to react to completion

Solution:
QUESTION: 71

The enzyme which can catalyse the conversion of glucose to ethanol is

Solution:
QUESTION: 72

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): Nitric oxide acts as homogeneous catalyst in the oxidation of carbon monoxide by oxygen.
Reason(R): Nitric oxide increases the rate of oxidation.

Solution:
QUESTION: 73

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): Second ionisation energy of C,N,O,F, increases in the order. C < N < F < O.
Reason (R): Ionisation energy increase with deceasing size.

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): Bromide ion is serving as a reducing agent in a reaction.
2MnO₄⁻(aq) + Br⁻(aq) + H₂O(l)→2MnO₂(aq) + BrO₃⁻(aq) + 2OH⁻(aq).
Reason(R): Oxidation number of Br increases from -1 to 5.

Solution:
QUESTION: 75

What is the entropy change (in J K-1 mol-1), when one mole of ice is converted into water at 0ºC? (The enthalpy change for the conversion of ice to liquid water is 6.0kJ mol-1 at 0ºC)

Solution:


Here, ΔfH = 6000Jmol-1, Tf = 273 K

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): [Ni(CN)4]2- has square planar and [NiCl4]2- has tetrahedral shape.
Reason(R): [Ni(CN)4]2- is diamagnetic while NiCl22- is paramagnetic.

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): Moving phase is solvent and stationary phase is cellulose in paper chromatography.
Reason(R): Paper chromatography is used for analysis of polar organic compounds.

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): Li is strongest reducing agent among alkali metals.
Reason(R): Li has highest hydration energy among alkali metals.

Solution:
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): H2S, SO2 and H2O follow law of reciprocal proportions.
Reason (R): Law of definite proportions state that when two elements combine to form two or more chemical compounds, then the masses of one of the elements which combines with a fix mass of the other, bears a simple ratio to one another.

Solution:
QUESTION: 80

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.

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): Sedatives are given to patients who are mentally agitated and violet.
Reason(R): Sedatives can suppress the activities of central nervous system .

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): Primary benzylic halides are more reactive than primary alkyl halides towards S(N)1 reactions.
Reason(R): Reactivity depends upon the nature of the nucleophile and the solvent.

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): Heat absorbed in a reaction at constant temperature and constant volume is -∆G.
Reason(R): ∆G should be negative for the reaction to be spontaneous.

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): FeF63- is colourless.
Reason(R): This is because no spin-allowed transitions are possible in Fe3+ (high spin).

Solution:
QUESTION: 85

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): Propadiene is optically active.
Reason(R): Propadiene has a plane of symmetry.

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): Molar conductance increases with dilution for an electrolyte solution while its specific conductance decreases.
Reason(R): The number of ions in one litre of electrolyte increases with dilution.

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): Mercuric chloride is known as corrosive sublimate.
Reason(R): Mercuric chloride is extremely poisonous substance.

Solution:
QUESTION: 88

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): Real gases obey ideal gas equation only if pressure is low or temperature is high
Reason(R): In high pressure and low temperature, volume occupied by gas molecules is negligible as compared to total volume of gas and force of attraction between gas molecules is also negligible.

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): Acetic acid in vapour state shows a molecular mass of 120.
Reason(R): It undergoes intermolecular hydrogen bonding.

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): Hydrazine does not give Lassaigne test for N.
Reason(R): Hydrazine does not form sodium cyanide.

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): Chloroform is stored in dark colour bottles. It oxidises to phoszene in presence of O₂ and sun light.
Reason(R): It oxidises to phoszene in presence of O₂ and sun light.

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): p-dimethylamino-benzaldehyde does not undergo benzoin condensation.
Reason(R): The aldehydic (-CHO) group is meta directing .

Solution:
QUESTION: 93

For the cell reaction,
Cu2⁺[C₁(aq)] + Zn(s) → Zn2⁺[C₂(aq)] + Cu(s)
of an electrochemical cell, the change in free energy ∆G at a given temperature is a function of

Solution:
QUESTION: 94

The highest electrical conductivity of the following aqueous solutions is of

Solution:
QUESTION: 95

A mixture of two gases is separated by

Solution:
QUESTION: 96

Which of the following oxidation state is/are exhibited by alkali metals in their compounds?

Solution:
QUESTION: 97

The metal that dissolves in liquid ammonia, giving a dark blue coloured solution is

Solution:
QUESTION: 98

Main process for the manufacture of Na₃CO₃ is

Solution:
QUESTION: 99

Which of the following alkaline earth metal is most abundant in the earth's crust?

Solution:
QUESTION: 100

Oxidation state of chlorine in hypochlorous acid is

Solution:
QUESTION: 101

One would expect proton to have very large

Solution:
QUESTION: 102

The pH of pure water at 25ºC is close to

Solution:
QUESTION: 103

In decinormal solution, CH₃COOH acid is ionised to the extent of 1.3%. If log 1.3=0.11. What is the pH of the solution?

Solution:
QUESTION: 104

How many ml of 1 M H₂SO₄ is required to neutralise 10 ml of 1 M NaOH solution?

Solution:
QUESTION: 105

When of the following statements is correct ?

Solution:
QUESTION: 106

Acetone is easily oxidising with

Solution:
QUESTION: 107

The conversion, PhCN → PhCOCH₃, can be achieved most conveniently by reaction with

Solution:
QUESTION: 108

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

Solution:
QUESTION: 109

Which of the following is the example of SN2 reaction?

Solution:
QUESTION: 110

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

Solution:
QUESTION: 111

Which gives more stable product ?

Solution:
QUESTION: 112

Which type of glass has a property to cut off ultra-violet rays?

Solution:
QUESTION: 113

Ultra-silicon is prepared by the process of

Solution:
QUESTION: 114

To get n-type doped semiconductor, impurity to be added to silicon should have the following number of valence electrons

Solution:
QUESTION: 115

3.65 grams of HCl is dissolved in 16.2 grams of water. The mole fraction of HCl in the resulting solution is......

Solution:
QUESTION: 116

0.01 M solution each of urea, common salt and Na₂SO₄ are taken, the ratio of depression of freezing point is

Solution:
QUESTION: 117

10 ml of conc. H₂SO₄ (10 molar) is diluted to 1 litre. The approximate strength of dilute acid could be

Solution:
QUESTION: 118

Isomers whose molecular structures are non-superimposable mirror images of each other are called:

Solution:
QUESTION: 119

The equivalent weight of a certain trivalent element is 20. The molecular weight of its oxide is

Solution:

As we know that Atomic mass = Equivalent weight x Valency
Mass of metal m = 20 x 3 = 60
Hence its oxide
= M2O3 = (2 x 60) + (3 x 16) = 168

QUESTION: 120

If KMnO₄ is reduced by oxalic acid in an acidic medium, then oxidation number of Mn changes from

Solution:
QUESTION: 121

In mammals haversian canals are connected with each other by transverse canals, which are called

Solution:
QUESTION: 122

Which one of the following is a matching pair of an animal and a certain phenomenon it exhibits?

Solution:
QUESTION: 123

Long hollow bones connected by passages are characteristic of

Solution:
QUESTION: 124

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): Compound umbel is branched.
Reason (R): In compound umbel, both involucre and involucels are present.

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): Placenta bears ovules.
Reason (R): An ovary has one placenta.

Solution:
QUESTION: 126

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): Histamine is involved in allergic and inflammatory reactions.
Reason(R): Histamine is a vasodilator.

Solution:

Histamine is a derivative of the aminoacid histidine produced by damaged cells of vertebrates. When released it has the effect of dialting capillaries and lowering of blood pressure. Histamine is involved in allergic and inflammatory reactions.

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

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): Tapetum helps in the liberation of microspores from tetrad.
Reason (R): Tapetum shows callose activity.

Solution:
QUESTION: 129

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): Plants mostly transpire through stomata.
Reason (R): Lenticular transpiration is found only in the woody branches.

Solution:
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): All insect pollinated flowers are cross pollinated.
Reason (R): Okra is a self pollinated plant.

Solution:

Pollination by insects is of very general occurrence among plants. pollination of a flower in which the pollen is carried on an insect is called entomophily. Entomophilous flowers are usually brightly coloured and scented and often secrete nectar. In some species (e.g. Primulas) there are structural differences between the flowers to ensure that cross- pollination occurs. Other examples of entomophilous flowers are orchids and antirrhinums. In Okra, the androecium is monoadelphous. It has a staminal column to which are attached monothecous anthers by small filaments. The capitate stigman projects beyond the staminal column. Bristile beetles are closely associated with the flowers of Okra and feed upon is petals and pollen grains.
While crawling inside the flower the beetles transfer pollen grains to the upper surface of the stigma.
Although, an insect is involved in this pollination, it is self pollination as pollen is transferred to the stigma of same flower

QUESTION: 131

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): A father may be a haemophilic, only if his mother is a carrier.
Reason(R): The father cannot pass on a sex-linked gane to his son.

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): Vessel and sieve tube, both are meant for transport purposes.
Reason (R): Vessels are lignified.

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

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: 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): In bacteria, photosynthesis occurs by utilizing wavelengths longer than 700 nm.
Reason(R): Here the reaction centre is P-890.

Solution:

Bacterial photosynthesis occurs by utilizing wavelengths longer than 700 nm. Here, the reaction centre is P-890 and the reductant is NADH + H+. In bacteria, the donar is hydrogen sulphide or malate or succinate instead of water.

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): Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason(R): Anti-diuretic hormone (ADH) is secreted by the posterior lobe of pituitary gland.

Solution:

Anti-diuretic hormone (ADH) or vasopressin is a peptide hormone, synthesized in the hypothalamus and released by the posterior pituitary gland, that stimulates capillary muscles and reduces the flow of urine and increases its concentration. It is released in response to a fall in the water content of blood plasma and lead to an increase in the permeability to water of the distal and collecting tubules of the nephron. Deficiency or hyposecretion of ADH results in diabetes insipidus.
Diabetes insipidus is characterized by micturating dilute urine several times a dday which results in excessive thirst and dehydration.

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

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): Interferons are a type of antibodies produced by body cells infected by bacteria.
Reason(R): Interferons stimulate inflammation at the site of injury.

Solution:

Interferons are not antibodies.These are defence proteins that are produced by body cells that are infected by a virus. They travel to nearby cells and prevent the spread of the virus.
Cells that have been infected produce chemical called histamine. This chemical causes the blood capillaries to dilate (get wider) and become more porous. As a result the area swells, gets red, becomes warm, and is painful. This results in more white blood cells coming to the area to fight the infection. If the inflammation happens over the whole body we get a fever. The fever is the body’s way to combat bacteria and viruses. The higher temperature inhibits the pathogen from reproducing.Interferons do not stimulate inflammation at the site of injury.

QUESTION: 138

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): Estuaries are generally productive.
Reason (R): An estuary is formed by river.

Solution:
QUESTION: 139

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): An organism with lethal mutation may not even develop beyond the zygote stage.
Reason(R): All types of gene mutations are lethal.

Solution:

Mutations are sudden and abruptive qualitative or quantitative change in the genetic material of an organism. According to their effects on the phenotype, mutations may be classified as lethals, and supervitals. Lethal mutations results in death of the cells or organism in which they occur. The organism may not even develop beyond the zygote stage. Subvital reduces the chances of survival. Supervital mutations results in the improvement of biological fitness under certain conditions. There may also be mutations which are neither harmful nor beneficial to the organisms in which they occur.

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): Mostly in a tetrad, all microspores are free.
Reason (R): Compounds pollen grain and pollinium are formed by grouping of microspores.

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): C4-plants photosynthesize more efficiently than C3-plants.
Reason(R): C4-plants have a shorter carbon dioxide fixation cycle.

Solution:

The initial work of Kortschak, Hartt and Barr, which demonstrated that rapidly photosynthesizing sugarcane plants fix CO2 into aspartic and malic acids, was confirmed by Hatch and Slack. Hatch and Slack proposed this pathway as Hatch and Slack pathway and named such plant as C4 plants (as the products are four carbon compounds).
C4 plants possess two types of chloroplasts bundle sheath cells and mesophyll cells. The mesophyll cells of C4plants exhibit high activity of phosphoenolpyruvate (PEP) carboxylase, which catalyzes the fixation of CO2 with PEP to form oxaloacetic acid. The bundle sheath cells exhibit high RuBP carboxylase and the other enzymes of the Calvin – Benson cycle. C4 plants are highly productive photosynthetically in view of the low affinity of the RuBP carboxylase for its substrate. But CO2 is concentrated as C4acids due to the activity of the PEP carbgoxylase, which in effect maintains high pool levels of CO2 C4 plants are related to very high light – harvesting saturation points. C4 plants exibit low rates of photorespiration only in bundle sheath cells. C4 plants are adapted to high temperature. C4 plants show better utilization of available water.

QUESTION: 142

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): Pollen-grain reaches directly to the egg, which is seated deep in the ovarian cavity.
Reason(R): To effect fertilization in this group of plants the pollengrains germinate on the stigma by putting forth tubes.

Solution:
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): Root pockets are similar in all terms to root caps.
Reason (R): Root caps and root pockets have the ability to regenerate.

Solution:
QUESTION: 144

The stored food material found in muscles is

Solution:
QUESTION: 145

Which of the following would describe the path of the blood in the pulmonary circuit?

Solution:
QUESTION: 146

Common phase between aerobic and anaerobic modes of respiration is

Solution:
QUESTION: 147

The membrane that hangs like an apron over the intestines is the _____.

Solution:

A fatty membrane called the greater omentum hangs like an apron from the inferolateral margin of the stomach and overlies the intestines . It is unattached at its inferior border and can be lifted to reveal the intestines.

QUESTION: 148

Transformation experiment was first performed on :

Solution:
QUESTION: 149

A milk like preparation can be made from the seeds of

Solution:
QUESTION: 150

The spice yielding family is

Solution:
QUESTION: 151

Cardamoms are ripe dried fruits of

Solution:
QUESTION: 152

Cranial capacity is minimum in

Solution:
QUESTION: 153

Okazaki fragment are joined by enzyme

Solution:
QUESTION: 154

During transcription, if nucleotide sequence of DNA strand, that is being coded is ATACG, then the nucleotide sequence in the m-RNA would be

Solution:
QUESTION: 155

Phenotype ratio of dihybrid test cross is :

Solution:
QUESTION: 156

Colour blindness is disease in which the factor is usually transmitted to children by woman. It is because the factor is located on

Solution:
QUESTION: 157

Resistance against disease is provided by

Solution:
QUESTION: 158

Rh factor is named after

Solution:
QUESTION: 159

A blood group has both A and B antigens but no antibodies. It is

Solution:
QUESTION: 160

Interferons are synthesised in response to

Solution:
QUESTION: 161

Which is true

Solution:
QUESTION: 162

Streptomyces griseus produces antibiotic

Solution:
QUESTION: 163

Plasmid is

Solution:
QUESTION: 164

The ATP production in photosynthesis, is called

Solution:
QUESTION: 165

Which of the following best describes the location of ions during resting potential?

Solution:
QUESTION: 166

What is true for photosynthesis

Solution:
QUESTION: 167

Hypothesis for oxygen coming from water was put forward by

Solution:
QUESTION: 168

Humilin is

Solution:
QUESTION: 169

Sieve tube is component of

Solution:
QUESTION: 170

The example of a chemical pollutant is

Solution:
QUESTION: 171

Amino acids are formed during digestion of

Solution:
QUESTION: 172

In vanda (orchid) velamen root or the function of velamen is