# AIIMS Physics Mock Test - 4

## 60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Physics Mock Test - 4

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Attempt AIIMS Physics Mock Test - 4 | 60 questions in 60 minutes | Mock test for NEET preparation | Free important questions MCQ to study AIIMS Mock Tests & Previous Year Papers for NEET Exam | Download free PDF with solutions
QUESTION: 1

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QUESTION: 2

Solution:
QUESTION: 3

### Putting a dielectric substance between two plates of a condenser, the capacity, potential and potential energy respectively

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QUESTION: 4

A block of mass 0.50 kg is moved with a speed of 2.00 m/s on a smooth surface . It strikes another mass of 1.00 kg and then they move together as a single body . The energy loss during the collision is

Solution:
QUESTION: 5

What will happen to de-Broglie's wavelength if the velocity of electron is increased ?

Solution:
QUESTION: 6

A battery having emf 4 V and internal resistance 0.5 Ω is connected with a resistance of 4.5 Ω, then the voltage at the terminals of battery is

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QUESTION: 7

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

Solution:
QUESTION: 8

Mutual inductance of two coils can be increased by

Solution:

∴ M can be increased by increasing the number of turns in the coils.

QUESTION: 9

In an electron gun, the electrons are accelerated by the potential V. If e is the charge and m is the mass of an electron, then the maximum velocity of these electrons will be

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QUESTION: 10

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

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QUESTION: 11

The essential distinction between X-rays and γ-rays is that

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QUESTION: 12

The coil of a dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. The phenomenon can be correctly described as

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QUESTION: 13

A light bulb and a parallel plate capacitor (including a dielectric material between the plates) are connected in series to the 60-Hz ac voltage at a wall outlet. When the dielectric material is removed from the space between the plates, does the brightness of the bulb,

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QUESTION: 14

The velocity of light in vacuum can be changed by changing

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QUESTION: 15

If the distance between the plates of a parallel plate condenser is halved and the dielectric is doubled, then its capacity increases by

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QUESTION: 16

If the stone is thrown up vertically and return to ground, its potential energy is maximum

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QUESTION: 17

Two masses of 1 gm and 4 gm are moving with equal kinetic energies. The ratio of the magnitudes of their linear momentum is

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QUESTION: 18

The region between two concentric spheres of radii R1 and R2 includes a volume charge density given by where a is a constant and r is the distance from the centre. There is a charge Q located at the centre. The value of a for which the region R1 ≤ r ≤ R2 has a constant electric field intensity is

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QUESTION: 19

Out of the following bulbs which has the maximum resitance,

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QUESTION: 20

When red glass is heated in dark room it will seem

Solution: Option A is correct. while piece of red glass heated in high temperature it glows green only for further a piece of green glass heated in high temperature it glows red only.
QUESTION: 21

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

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QUESTION: 22

A bar magnet is held perpendicular to a uniform field. If the couple acting on the magnet is to be halved by rotating from above position, the angle by which it is to be rotated is

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QUESTION: 23

A metallic wire is suspended by attaching some weight to it. If α is the longitudinal strain and Y is Young's modulus, then the ratio between elastic potential energy and the energy density is equal to

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QUESTION: 24

If the lift in quenstion no. 39 moves up with an acceleration equal to the acceleration due to gravity, the reading on the spring balance will be

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QUESTION: 25

Gamma rays are

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QUESTION: 26

A mass m is vertically suspended from a spring of negligible mass. The system oscillates with a frequency n. What will be the frequency of the system, if a mass 4m is suspended from the same spring ?

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): Whether the electromagnetic field will show up as an electric field or a magnetic field or a combination, depends on the frame from which we are looking at the field.
Reason(R): Electromagnetic field is frame independent.

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):If a dielectric is placed in an electrical field, induced surface charges appear which tend to weaker the original field within the dielectric.
Reason(R) : All dielectric materials have permanent dipole moments due to atomic or molecular dipoles.

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): Kirchoff's loop law represents conservation of energy.
Reason(R): If the sum of potential changes around a closed loop is not zero, unlimited energy could be gained by repeatedly carrying a charge around a loop.

Solution:
QUESTION: 30

In the following question, a Statement-1 is given followed by a corresponding Statement-2 just below it. Read the statements carefully and mark the correct answer-
Statement-1:
The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.
Statement-2:
Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

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): If a battery is connected across a circuit consisting of two identical capacitors and it is found that, in steady state, two capacitors have equal charge the two capacitors must be in series with each other.
Reason(R): When capacitors are in series, same charge passes through the capacitors.

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): 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.

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 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: 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): 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

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 current carrying solenoid is equivalent to a bar magnet.
Reason(R): The magnetic lines of force due to a bar magnet are not similar to those shown by a current carrying solenoid.

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 photon has no rest mass, yet it carries definite momentum.
Reason(R): Momentum of photon is due to its energy and hence its equivalent mass.

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): Two bodies having the same mass and same angular velocity of rotation may have different rotational kinetic energies.
Reason(R) : The moments of inertia of the two bodies will be different

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): SI unit of T-m2/s is equivalent to volts.
Reason(R): Both are the units of potential difference

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): If a projectile explodes in air in different parts, the path of centre of mass remains unchanged.
Reason(R): During the explosion no external force acts on the C.O.M.

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): 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.

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): The frequency of the fundamental tone of an open pipe is not exactly twice the frequency of the fundamental tone of a closed pipe of the same length .
Reason(R): Open pipe produces both even and odd harmonics.

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):Size of nuclear reactor should be less than a critical size.
Reason(R):Energy produced is kept under control.

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):Chemical properties of isotopes are same.
Reason(R):Two isotopes of same element cannot be separated by any chemical process.

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): Gravitational potential of the earth at every place is negative.
Reason(R): Everybody on earth is bound by the attraction of earth.

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): A car of mass 200 kg is taking a turn of radius 20 m on a road which is banked for a speed of 10 m/s. If the coefficient of friction between road and tyre of car is 0.7, then the maximum safe speed for turning is 19.2 m/s. [Take g = 10 m/s2 ]
Reason(R) : In above described situation, the friction force value acquires limiting value when car is moving with maximum or minimum safe turning speed.

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):Different ionising particles produce different tracks in Wilson Cloud chamber.
Reason(R):Penetration ranges are different.

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

Solution:
QUESTION: 48

Range of a projectile is R, when the angle of projection is 30º. Then, the value of the other angle of projection for the same range is

Solution:
QUESTION: 49

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

Solution:
QUESTION: 50

A plano convex lens is made refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is

Solution:
QUESTION: 51

Which of the following forms a perfect image free from all aberrations?

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QUESTION: 52

The intrinsic semiconductor becomes an insulator at

Solution:
QUESTION: 53

For a thermocouple the neutral temperature is 270ºC when its cold junction is at 20ºC. What will be the neutral temperature and the temperature of inversion when the temperature of cold junction is increased to 40ºC

Solution:
QUESTION: 54

In a P-type semiconductor the electrical conduction is due to

Solution:
QUESTION: 55

A quantity X is given by ∈₀ L ∆V∕∆t where ∈₀ is the permittivity of free space, L is a length, ∆V is a potential difference and ∆t is a time interval. The dimensional formula for X is the same as that of

Solution:
QUESTION: 56

The S.I unit of Moment of Inertia is

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QUESTION: 57

When two coherent monochromatic light beams of intensities I and 4I are superimposed, the ratio between maximum and minimum intensities in the resultant beam is

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QUESTION: 58

Which of the following property of light waves is not observed in sound waves?

Solution:
QUESTION: 59

Both light and sound waves produce diffraction. It is more difficult to observe the diffraction with light waves because

Solution:
QUESTION: 60

A body of mass m kg is lifted by a man to a height of one meter in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done by them are in the ratio

Solution:
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