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# AIIMS Physics Mock Test 9

## 60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Physics Mock Test 9

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This mock test of AIIMS Physics Mock Test 9 for NEET helps you for every NEET entrance exam. This contains 60 Multiple Choice Questions for NEET AIIMS Physics Mock Test 9 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Physics Mock Test 9 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Physics Mock Test 9 exercise for a better result in the exam. You can find other AIIMS Physics Mock Test 9 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### Three cells each of e.m.f. 1.5 V and internal resistance 1 Ω are connected in parallel. What would be the e.m.f. of the combination ?

Solution:
QUESTION: 4

Electron microscope use electron for their which property

Solution:
QUESTION: 5

The speed of electrons in a cathode ray beam which remains undeflected, in Thomson's experiment, under the simultaneous action of a magnetic field of 2 X 10−3 wbm−2 and that of an electric field of 3 . 4 X 10 4 V m − 1 is

Solution:
QUESTION: 6

The charge deposited on 4 μ F capacitor in the circuit is

Solution:
QUESTION: 7

A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is

Solution:
QUESTION: 8

If a radiation of energy E falls normally on a perfectly reflecting surface, then the momentum transferred to the surface is

Solution:
QUESTION: 9

If momentum of a particle is doubled, then its de-Broglie's wavelength will

Solution:
QUESTION: 10

The power factor of a good choke coil is

Solution:
QUESTION: 11

The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane, along the perpendicular direction. The induced current in the conducting plane is

Solution:

As per Lenz's law, induced current must be anticlockwise, so as to develop north polarity to oppose the incoming north pole.

QUESTION: 12

The energy stored in coil carrying current I s U. If current is halved, then energy stored in the coil will be

Solution:
QUESTION: 13

A coil of inductances 300mH and resistance 2 Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in

Solution: QUESTION: 14

Which of the following statement is true?

Solution:
QUESTION: 15

A point charge q is placed at the centre of a skeleton cube made of thin non-conducting wire. The electric flux passing through one face of the cube is

Solution:
QUESTION: 16

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Solution:
QUESTION: 17

Two bodies of mass m₁ and m₂ have equal kinetic energies. If p₁ and p₂ are their respective momentum, then ratio p₁ : p₂ is equal to

Solution:
QUESTION: 18

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

Solution:
QUESTION: 19

The lengths and radii of two rods made of same material are in the ratios 1:2 and 2:3 respectively. If the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them will be in the ratio

Solution:
QUESTION: 20

A 100 W, 200 V bulb is connected to a 160 volt supply. The actual power would be

Solution:
QUESTION: 21

When a material is placed in magnetic field 'B'. Magnetic moment proportional to 'B' but opposite in direction is induced. The material is

Solution:
QUESTION: 22

A thin rectangular magnet suspended freely has a period of oscillation equal to T. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is T ′ the ratio T ′ T is

Solution:
QUESTION: 23

The ratio of tangential stress to the shearing strain is called

Solution:
QUESTION: 24

A wagon 1000 kg is moving with a velocity 50 km/h on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now is

Solution:

m1u = m2v
1000 X 50 = (1000 + 250) ν, ν = 40 km / hr.

QUESTION: 25

The particle having a major role in binding the nucleus is-

Solution:
QUESTION: 26

Average value of K.E. and P.E. over entire time period 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): We use a thick wire in the secondary of a step down transformer to reduce the production of heat.
Reason(R): When the plane of the armature is parallel to the line of force of magnetic field, the magnitude of the induced emf is maximum.

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): A graph between the absolute temperature (T) of a gas and the square of speed of sound (v2) will bea parabola.
Reason(R): symbols have their usual meaning .

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): Frequency of note emitted by an organ pipe will decrease with rise in temperature.
Reason(R): Frequency = 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 uniform thin rod of length L is hinged about one of its end is free to rotate about the hinge without friction. Neglect the effect of gravity. A force F is applied at a distance x from the hinge on the rod such that force is always perpendicular to the rod. As the value of x is increased from zero to L, the component of reaction by hinge on the rod perpendicular to length of rod increases.
Reason(R) : Under the conditions given in statement 1 as x is increased from zero to L, the angular acceleration of rod increases.

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): In general magnetic force between two charges is much smaller compared to the electric force .
Reason(R): In general velocity of charges << velocity of light in free space.

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):A retarding force is applied to stop a motor car. If the speed of the motor car is doubled, it will cover a distance four times longer before coming to stop, under the same retarding force.
Reason(R):Distance=SpeedXtime

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

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): Thomson's method of determining e m of positive rays, a parabola is obtained on the screen.
Reason(R): Electric field e and magnetic field B are kept parallel to each other.

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): X-rays are electromagnetic waves.
Reason(R) : They can be deflected by electric and magnetic fields.

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):The speed of driving a car safely in darkness depends upon the range of the headlight.
Reason(R):The range of the headlight of the car is the limit of the maximum distance upto which an obstacle on the road can be seen by the driver in darkness.

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): It is given that and vector . The angle between vector and is π
Reason(R) : Vectors and must be in the opposite directions.

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): According to Bohr's postulates, the electrons in stationary orbits do not radiate energy.
Reason(R) : According to classical physics, an accelerated charged particle emits radiation.

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 electron passing through crossed magnetic and electric field is always deflected from its path.
Reason(R): If velocity of electrons is equal to the ratio of electric and magnetic field applied then electron beam may remain undeflected.

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): Heavy stable nuclides tend to have more number of neutrons than protons.
Reason(R) : In heavy nuclei, there is an excess of neutrons due to Coulomb repulsion between protons.

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):Speed of any particle cannot approach the speed of light.
Reason(R): (symbols have their usual meaning).

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 capacitance of a condenser increases when a dielectric medium is filled between its plate.
Reason(R): Potential difference between the plates of capacitor is reduced by dielectric medium.

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): 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.

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 ratio of rate of production (R) of neutrons to the rate of leakage of neutrons from a spherical body of 92U235 is directly proportional to radius (r).
Reason(R): Rate of production of neutron is directly proportional to volume but rate of leakage of neutrons is directly proportional to area.

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): Bulbs of ultraviolet lamps are made of quartz.
Reason(R): Ultraviolet radiations pass earily through glass.

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): Smell of ozone is found near electric spark.
Reason(R): Ozone protects ultraviolet radiations from reaching the earth.

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

Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

Solution:
QUESTION: 49

A mercury vapour lamp is the example of

Solution:
QUESTION: 50

A person cannot see clearly distances more than 40 cm. He advised to use lens of power

Solution:
QUESTION: 51

'Mirage' is a phenomenon due to

Solution:
QUESTION: 52

Donor type impurity is found in

Solution:
QUESTION: 53

If a full wave rectifier circuit is operating from 50 Hz, mains, the fundamental frequency in the ripple will be

Solution:
QUESTION: 54

The heat developed in an electric wire of resistance R by a current I for a time t is

Solution:
QUESTION: 55

A suitable unit for gravitational constant is

Solution:
QUESTION: 56

Laser light is considered to be coherent as it consists of

Solution:
QUESTION: 57

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

Solution:
QUESTION: 58

In Huygen's wave theory, the locus of all points oscillating in the same phase is called a

Solution:
QUESTION: 59

In C.G.S. system the magnitude of the force is 100 dynes. In another system where the fundamental physical quantities are kilogram, metre and minute, the magnitude of the force is

Solution:
QUESTION: 60

A body of mass m is moving in a circle of radius r with a constant speed v. The force on the body is mv 2 r and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle

Solution:

Work done by the centripetal force is zero

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