# AIIMS Physics Mock Test - 2

## 60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Physics Mock Test - 2

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Attempt AIIMS Physics Mock Test - 2 | 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

Solution:
QUESTION: 2

### In photoelectric effect, the photoelectric current

Solution:

Higher photocurrent implies, higher no. of electrons emitted/sec which in turn implies higher no. of photons incident per sec per unit area of higher intensity.
Moreover by increasing frequency, energy of incident photon gets changed but not their number

QUESTION: 3

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

Solution:

C 1 = 10 μ F , C 2 = 20 μ F
Fquivalent capacitance in series

Chage on each capacitor

In series charge in both capacitor is same.

∴ total charge =

Now the capacitors are connected in parallel

Equivalent capacitance in parallel.

Ptential V' =

QUESTION: 4

The kinetic energy of an electron gets tripled, then the de Broglie wavelength associated with it changes by a factor

Solution:

QUESTION: 5

If we express the energy of a photon in KeV and the wavelength in angstroms, then energy of a photon can be calculated from the relation

Solution:
QUESTION: 6

Which of the following statements is correct ?

Solution:
QUESTION: 7

A uniform resistance wire of length L and diameter d has a resistance R. Another wire of same material has length 4 L and diameter 2 d, the resistance will be

Solution:
QUESTION: 8

A shell initially at rest explodes into two pieces of equal mass, then the two pieces will

Solution:
QUESTION: 9

Who indirectly determined the mass of the electron by measuring the charge of the electron ?

Solution:
QUESTION: 10

The core of a transformer is laminated so that

Solution:
QUESTION: 11

A metallic rod of length l is placed normal to the magnetic field B and revolved in a circular path about one of the ends with angular speed ω. The potential difference across the ends will be

Solution:
QUESTION: 12

What will be the phase difference between virtual voltage and virtual current, when the current in the circuit is wattless ?

Solution:
QUESTION: 13

What is the cause of "Green house effect"?

Solution:
QUESTION: 14

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: 15

An electric dipole consists of two opposite charges of magnitude q seperated by 2a. When the dipole is placed in uniform electric field E, to have minimum potential energy, then dipole moment p makes which the following angle with E

Solution:
QUESTION: 16

Two spherical conductors A and B having equal radii and carrying equal charges on them, repel each other with a force F, when kept apart at some distance. A third spherical conductor C having same radius as that of A, but uncharged, is brought in contact with A, then brought in contact with B and finally removed away from both. The new force of repulsion between the conductors A and B is

Solution:
QUESTION: 17

If the linear momentum is increased by 50%, the kinetic energy will increase by

Solution:
QUESTION: 18

The enegy stored in wound watch spring is

Solution:
QUESTION: 19

Radiation emitted by a surface is directly proportional to

Solution:
QUESTION: 20

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

Solution:
QUESTION: 21

When 2 ampere current is passed through a tangent galvanometer, it gives a deflection of 30º. For 60º deflection, the current must be

Solution:

For tangent Galvanometer

QUESTION: 22

The temperature above which a ferromagnetic material become a paramagnetic material is called

Solution:
QUESTION: 23

The ratio of tangential stress to the shearing strain is called

Solution:
QUESTION: 24

The time periode of simple pendulum measured inside a stationary lift is found to be T. If the lift starts acclerating upwards with an acceleration g/3, the time periode is

Solution:
QUESTION: 25

Which of the following is a moderator?

Solution:
QUESTION: 26

When the bob of a simple pendulum, held in hand is subjected to and fro motion at hill, then the oscillations of the bob will be

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): The centre of mass of an extended object is that point on the object where the resultant of all the external forces acting on the body acts.
Reason(R) : An object under the effect of several external forces moves as if it were a particle placed at its centre of mass and all forces transferred to the point.

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): Pressure in a bubble (σ) in an atmosphere of pressure P0 is where r is the radius.
Reason(R): is the excess pressure due to two surfaces exposed to the atmosphere.

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):When a slow neutron goes sufficient close to a U235 nucleus, energy is liberated.
Reason(R):Process of nuclear fusion takes place.

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): Magnetic field due to circular coil is maximum at the centre and decreases as we move away from the centre on the axis of loop.
Reason(R): Magnetic field on the axis of a circular loop is given by .

Solution:
QUESTION: 31

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Energy level of an atom with an vacancy in K-shell is below the L,M and N-shells that is lowest.
Reason(R): Electrons in K-shell are most tightly bound.

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): In an elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of oscillation of the balls, when they are in contact.
Reason(R): Energy spent against friction does not follow the law of conservation of energy.

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 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.

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 sum and difference of two vectors will be equal in magnitude, when the two vectors are perpendicular to each other.
Reason(R): Either of the two vectors is a null vector.

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): Photoelectric effect demonstrate the wave nature of light.
Reason(R): The number of photoelectrons is proportional to frequency of light.

Solution:
QUESTION: 36

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 formula connecting u,v and f for a spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature.
Statement-2:
Laws of reflection are strictly valid for plane surfaces, but not for large spherical surfaces.

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): Screw gauge with a pitch of 0.5 mm is more accurate than 1 mm for same number of circular scale divisions.
Reason(R): Higher pitch can make an accurate device.

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): A current carrying wire produces electric field.
Reason(R): The current in a wire is due to the flow of free electrons in a definite direction.

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):Nuclear fission is the basis of a hydrogen bomb.
Reason(R):Fission bomb is much more powerful and destructive than the fission bomb.

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): Internal energy change is zero if the temperature is constant, irrespective of the process being cyclic or non-cyclic.
Reason(R): dU = nC0dT for all processes and is independent of path.

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

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): Force is a polar vector.
Reason (R): Polar vectors are vectors with a point of application.

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): Y = 2Asin kx cos ωt refers to a travelling wave along -ve x-direction.
Reason(R): When a continuous travelling wave interacts with its reflection from a rigid support, forms a standing wave.

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): A changing magnetic field acts as a source of electric field known as induced electric field.
Reason(R): Induced electric field can be produced by any static charge distribution.

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 particle move from A (X1,Y1,Z1) to B (X2,Y2,Z2), displacement is given as (X2-X1)i, (Y2-Y1)j, (Z2-Z1)k.
Reason (R):Displacement can be positive, negative or zero.

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): Trajectory of an electron in a magnetic field is circular and radius of the path is proportional to the magnetic field.
Reason(R): F = evB. (Where e is charge , u is velocity, B is magnetic field).

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

A ball is projected with kinetic energy E at an angle of 45º to the horizontal. At the highest point during its flight, its kinetic energy will be

Solution:

Kinetic Energy = E = 1/2 mv2

Velocity of the particle at highest point = vcos 45

Kinetic Energy of the particle at the highest point =

QUESTION: 49

An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm. A real image is formed at a distance of 75 cm from the lens. The size of image will be

Solution:

O = 1.5

QUESTION: 50

A doctor advises a patient to use spectacles with a convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. What is the power of the combination ?

Solution: Let the power of convex lens be P1.. P1=100/40=2.5 D P1=2.5D let the power of concave lens be P2.. P2= -100/25= -4D P2= -4D let combined the both values...we get; P1+P2=2.5-4= -1.5 D.
QUESTION: 51

Refractive index

Solution:
QUESTION: 52

In a semiconductor

Solution:
QUESTION: 53

At room temperature, a P-type semiconductor has

Solution:
QUESTION: 54

A thermally insulated rigid container contains gas and a coil of resistance 100 Ω. The gas is heated by passing a current of 1 A for 5 min in the coil. The change in internal energy of gas after 5 min will be

Solution: Yes the option D is correct answer....solution;del W=0 and delQ=delUdel U=(i)^2×R×del Tdel U=(1)^2×100×(5×60)del U=30000joulesas per the qn and solution converts joules into kilojoules...and so u get 30KJ.
QUESTION: 55

The unit of force is a

Solution:
QUESTION: 56

If a star is moving towards the earth, then the spectrum lines are shifted towards

Solution:
QUESTION: 57

The S.I. unit of radioactivity is

Solution:
QUESTION: 58

Two waves of same frequency, but of amplitudes in the ratio 1:3 are superimposed. The ratio of maximum to minimum intensity is

Solution:
QUESTION: 59

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: 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 = t3/3, where x is in meters and t is in sec. The work done by the force in the first two seconds is

Solution:
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