# AIIMS Physics Mock Test - 3

## 60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Physics Mock Test - 3

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Attempt AIIMS Physics Mock Test - 3 | 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

Solution:
QUESTION: 3

### Three capacitors, each of capacity 4 μF are to be connected in such a way that the effective capacitance is 6 μF. This can be done by

Solution:
QUESTION: 4

A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV. Minimum value of reverse potential to be applied for stopping the emission of electrons is

Solution:
QUESTION: 5

When subjected to a transverse electric field, cathode rays move

Solution:
QUESTION: 6

A body of mass m1 moving with a velocity 10ms-1 collides with another body at rest of mass m2. After collision the velocities of the two bodies are 2 ms-1 and 5 ms-1 respectively along the direction of motion of m1. The ratio m1/m2 is

Solution:
QUESTION: 7

A galvanometer of resistance 25 Ω gives full scale deflection for a current of 10 milliampere, is to be changed into a voltmeter of range 100 V by connecting a resistance of 'R' in series with galvanometer. The value of resistance R in Ω is

Solution:
QUESTION: 8

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

Solution:
QUESTION: 9

The ratio of specific charge of an α-particle to that of a proton is

Solution:
QUESTION: 10

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

Solution:
QUESTION: 11

The current in a coil changes from 4 A to zero in 0.1 s. If average e.m.f. induced is 100 V, what is self-inductance of coil ?

Solution:
QUESTION: 12

A 220 V, 1000 watt bulb is connected across a 110 V mains supply. The power consumed will be

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 = 1000 s−1 ?

Solution:
QUESTION: 14

An electromagnetic wave passing through vacuum is described by the equations: E = E₀ sin (kx-ωt) and B = B₀ sin (Kx-ωt). Then

Solution:
QUESTION: 15

Six identical +ve charges, each +Q and two identical charges, each −Q are fixed at the corners of cube of edge a. The negative charges are located at diagonally opposite corners. The electo potential energy of the system is

Solution:
QUESTION: 16

The electric potential at any point (x,y,z) in a space is given by: V=4x2 volt. The electric field at (1,0,2) m in space is

Solution: Magnitude of electric field at the point (1m, 0, 2m) = −8V ∕ m

QUESTION: 17

A particle of mass m has momentum p. its kinetic energy will be

Solution:
QUESTION: 18

If the K.E of a particle is doubled, then its momentum will

Solution:
QUESTION: 19

The temperature of hot and cold end of a 20 cm long rod in thermal steady state are at 100ºC and 20ºC respectively. Temperature at the centre of the rod is

Solution:
QUESTION: 20

The magnetic needle of a vibration magnetometer makes 12 oscillations per minute in the horizontal component of earth's magnetic field. When an external short bar magnet is placed at some distance along the axis of the needle in the same line, it makes 15 oscillations per minute. If the poles of the bar magnet are interchanged, the number of oscillations it makes per minute is

Solution:

The frequency of a vibration magnetometer is QUESTION: 21

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20ºC? The temperature of boiling water is 100ºC.

Solution: QUESTION: 22

A magnet freely suspended in a vibration magnetometer makes 40 oscillations per minute at a place 'A' and 20 oscillations per minute at a place 'B'. If the horizontal component of earth's magnetic field at 'A' is 36 x 10−6T, then its value at 'B' is

Solution:
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

Solution:
QUESTION: 24

Three light strings are connected at the point P. A weight W is suspended from one of the strings .End A of string AP and end B of string PB are fixed as shown .In equilibrium PB is horizontal and PA makes an angle of 60º with the horizontal .If the tension in PB is 30 N then the tension in PA and weight W are respectively Solution:
QUESTION: 25

The half-life of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is-

Solution: QUESTION: 26

A particle of mass 0.1 kg is undergoing simple harmonic motion of amplitude 1m and period 0.2 second. If the oscillations are produced by a spring, what is the force consrant of the 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): 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.

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): Kirchhoff's first law expresses the law of conservation of energy .
Reason(R): When a steady current flows in a circuit there is neither any acumulation of charge at any point in the circuit nor any charge is removed from there .

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):The quartz fibres in moving coil galvanometer are silvered .
Reason(R): Silvered surface reflects maximum light.

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): 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.

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): Pressure of a gas in a discharge tube for the production of cathode rays is of the order of 10-1mm of mercury.
Reason(R): At very low pressure, the number of atoms will be too small.

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): Electric lines of force do not intersect each other.
Reason(R) : The electric field at any point along a line of force is unique and its direction is given by the tangent to the line of force at that point.

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): If bodies slide down an inclined plane without rolling then all bodies reach the bottom simultaneously.
Reason(R): Acceleration of all bodies are equal and independent of the shape.

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): During sunset, sun appears large in size, red and circular.
Reason(R) : It is the consequence of scattering and refraction of light due to the atmosphere.

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): 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: 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): In projectile motion both magnitude and direction of v change.
Reason (R):Force is antiparallel.

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): 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: 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): Due to opposition offered by self-inductance, work is done by external agent in establishing current in circuit. This work done is stored as potential energy.
Reason(R): Self-inductance of a coil depends on the geometry of coils and medium.

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 pin-sited hole is created in an otherwise uniform spherical shell of definite mass and radius, the gravitational field at a point just out side and close to hole is zero
Reason(R): In the given case, the field just inside and just outside (along the hole) must be same the field inside is zero, hence the field outside should also be zero.

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): Steel ball bearings are used in ceiling fans in regulating the speed of rotation of the fan.
Reason(R) : Frictional torques act as a dissipative sources for loss of power in rotation

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): Specific gravity of a fluid is a dimensionless quantity.
Reason(R): It is the ratio of density of fluid to the density of water.

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):If a body is not in rest position then the net external force acting on it cannot be zero.
Reason(R):If a body is moving with uniform speed it will continue doing so unless frictional force exceeds the force of motion.

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): Work done by a force is independent of path followed by the body.
Reason(R): Velocity is a vector physical quantity.

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): The Lorentzian force acts like a torque on the charge moving with a velocity.
Reason(R) : As any torque is I α , the Lorentzian force produces acceleration.

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

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): As the radius of earth reduces by 50% without any change in mass, length of a day reduces.
Reason(R): Angular momentum conservation provides drop in time as l decreases to 25% of the original.

Solution:
QUESTION: 47

If a force is applied on a body and it moves with a velocity ν, the power will be

Solution:
QUESTION: 48

A particle reaches its highest point when it has covered exactly one half of its horizontal range. The corresponding point on the displacement time graph is characterised by

Solution:
QUESTION: 49

The distance between an object and a divergent lens is m times the focal length of the lens. The linear magnification produced by the lens is

Solution:
QUESTION: 50

Red light is used as danger signal because it is

Solution:
QUESTION: 51

The dominant contribution to current comes from holes in case of

Solution:
QUESTION: 52

A ray of light travelling in water is incident on its surface open to air. The angle of incidence is θ, which is less than the critical angle. Then there will be

Solution:
QUESTION: 53

A example of a semiconductor is

Solution:
QUESTION: 54

Which of the following is not the reason for the conductivity of electrolytes?

Solution:
QUESTION: 55

The unit of e.m.f. is

Solution:
QUESTION: 56

Unit of energy of SI system is

Solution:
QUESTION: 57

The wave theory of light was given by

Solution:
QUESTION: 58

The phase difference between any two points on a wavefront is

Solution:
QUESTION: 59

In Young's double slit interference experiment the wavelength of light used is 6000 Å . If the path difference between waves reaching a point P on the screen is 1.5 microns, then at that point P

Solution:
QUESTION: 60

A body moves a distance of 10 m along a straight line under the action of a force of 5N. If the work done is 25 joules, the angle which the force makes with the direction of motion of the body is

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