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# AIIMS Physics Mock Test - 1

## 60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Physics Mock Test - 1

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

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### Three capacitors each of capacitance C and of breakdown voltage V are joined in series. The capacitance and breakdown voltage of the combination will be:

Solution: In series,
capacitance.1/Cs=1/C1+1/C2+1/C3.
1/Cs=1/C+1/C+1/C.
1/Cs=3/C.
Cs=C/3.
in series, charge remains constant...
Vs=V1+V2+V3.
Vs=V+V+V.
Vs=3V
QUESTION: 4

A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragements with equal masses fly in mutually perpendicular directions with speeds of 21 m/sec. The velocity of the heaviest fragment will be

Solution:

Momentum of first body
p1 = 1 x 21 = 21 kg-m / sec.

Momentum of second body
p2 = 1 x 21 = 21 kg. m / sec.
Momentum of third body p3 = 3V kg - m / sec
Initial momentum = zero
∴ final momentum = 0

QUESTION: 5

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are

Solution:

Since cross-section is non-uniform, therefore, only current will be constant

QUESTION: 6

de-Broglie hypothesis treated electrons as

Solution:
Louis de Broglie proposed that all particles could be treated as matter waves with a wavelength \lambdaλlambda, given by the following equation:
λ = h/mv

QUESTION: 7

Gases begin to conduct electricity at low pressure because

Solution:
QUESTION: 8

In a discharge tube at 0.02 mm, there is formation of

Solution:
QUESTION: 9

The effective value of a.c. in a circuit is 10 A. The peak value of current is

Solution: I rms =10 A. Peak value(I0)=I rms*root 2=10 root 2=14.14A.
QUESTION: 10

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:

I = I0 (1 - e-Rt/L)

= 150 x 0.693 x 10-3
= 0.10395 s = 0.1 s

QUESTION: 11

On increaing the number of electrons striking the anode of an X-ray tube, which one of the following parameters of the resulting X-ray would increase

Solution:
QUESTION: 12

A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. The current in transmission line is

Solution: V/V'=I'/I, so 240000/4000=100/I , I=10/6=1.67
QUESTION: 13

If the current is halved in a coil, then the energy stored is how much times the previous value

Solution:
QUESTION: 14

Which rays are not the portion of electro magnetic spectrum?

Solution:
QUESTION: 15

A conducting sphere of radius 10 cm is charged with 10 μC. Another uncharged sphere of radius 20 cm in allowed to touch it for some time. If both the spheres are separated, then surface density of charges on the spheres will be in the ratio of

Solution:
QUESTION: 16

If the unit of force and length be each increased by four times, then the unit of energy is increased by

Solution:
QUESTION: 17

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

Solution:
QUESTION: 18

At a common temperture, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are

Solution:
QUESTION: 19

A wire of resistance 20 Ω is covered with ice and a voltage of 210 V is applied across the wire, then rate of melting the ice is

Solution:
QUESTION: 20

A magnetic needle suspended freely orients itself

Solution:
QUESTION: 21

In Fig. 16.38, a third point charge -q is placed at point P. What is the electric force on -q due to the other two point charges?

Solution:

QUESTION: 22

A magnetic needle is kept in a non-uniform magnetic field. It experiences

Solution:
QUESTION: 23

How much force is required to produce an elongation of 0.2% in the length of a brass wire of diameter 0.6 mm? (Take Young's modulus for brass = 0.9x1011 N-m⁻2)

Solution:
QUESTION: 24

A bomb of mass 9 kg explodes into two pieces of masses 3kg and 6kg. The velocity of 3kg mass is 16m/s . The K.E of 6kg mass is

Solution:
QUESTION: 25

Which of the following is used as neutron absorber in the nuclear reactor?

Solution:
QUESTION: 26

A simple harmonic motion is represented by :y = 10 sin (20 t + 0.5). The amplitude of this motion 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): Hollow prism forms no spectra as a solid equilateral prism of glass.
Reason(R): Neglecting the thickness of the hollow glass surface, the media is same. So dispersion is not to take place.

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): We cannot think of a magnetic configuration with three poles.
Reason(R): A bar magnet does exert a torque on itself due to its own field.

Solution:

It is quite clear that magnetic poles always exists in pairs. Since, one can imagine magnetic field configuration with three poles. When north poles or south poles of two mangets are glued together. They provide a three pole field configuration. It is also know that a bar magnet does not exert a torque on itself due to its own field.

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): Surface area of a drop of liquid reduces to reduce energy.
Reason(R): Molecules on the surface of a drop have more energy than the molecules in the interior.

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 laser beam of 0.2 W can drill holes through a metal sheet whereas a 1000 W torch light cannot.
Reason (R): The frequency of laser is much higher than torch light.

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):When there is an electric current through a conducting wire along its length, then an electric field must exist insire the wire but parallel to it.
Reason(R): Electric current flows through a wire due to flow of electrons.

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): Everybody will have natural tendency to remain at rest.
Reason(R): Force always acts in the direction of motion.

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): Fluorescence is produced by ultraviolet light whereas infrared rays never excite fluorescence.
Reason(R) : The photon energy of ultraviolet rays is greater than that of infrared rays.

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):Neutrons are required for both fision and fission.
Reason(R):Penetrating power of neutron is very high.

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 intensity of sound is doubled loudness is also doubled.
Reason(R):The sensation of sound (intensive or feeble ) depends directly on the loudness of sound.

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): 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: 37

When two surfaces are coated with a lubricant, then they

Solution:

Due to lubricant, friction force will not act. And surface will slide

QUESTION: 38

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:
Two cylinders, one hollow (metal) and the other solid (wood) with the same mass and identical dimensions are simultaneously allowed to roll without slipping down an inclined plane from the same height. The hollow cylinder will reach the bottom of the inclined plane first.
Statement-2:
By the principle of conservation of energy, the total kinetic energies of both the cylinders are identical when they reach the bottom of the incline.

Solution:
QUESTION: 39

This question contains Statement - 1 and Statement - 2. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement - 1: The temperature dependence of resistance is usually given as R = R(1 + αΔt)    . The resistance of a wire changes from 100 Ω to 150 Ω when its temperature is increased from 27ºC to 227ºC . This implies that α = 2.5 x 10 − 3 ∕ ºC .
Statement - 2: R = R(1 + αΔt) is vaild only when the change in the temperature ΔT is small and ΔR = (R − R0) < < R0 .

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): In Thomson's method of determining e/m , the electric and magnetic fields are kept parallel to each other.
Reason(R): So that the electric and magnetic forces on the electron will be in the same plane.

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): A red object appears dark in yellow light.
Reason(R): The red colour is scattered less.

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): 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: 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): 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: 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): When a light wheel of mica is placed in the path of cathode rays, it starts rotating.
Reason(R): Cathode rays produce heat when they strike a material surface.

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): By lowering her extented hands, an ice-skater is able to spin her body at a large speed.
Reason(R) : Angular momentum is conserved if no torques act on a system.

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): For stable equilibrium, Force has to be zero and potential energy should be minimum.
Reason(R): For equilibrium, it is not necessary that the force is not zero.

Solution:
QUESTION: 47

An electric motor creates a tension of 4500 newton in a hoisting cable and reels it in at the rate of 2 m/sec. What is the power of electric motor

Solution:
Power (P) = Energy used (E) / time period (t)

P=E/t

We know that

E= Force(F) * Displacement(s)

So, P= F*s/t

We know that

Velocity(v) = displacement (s)/time(t)

Using this

→ P=Fv

→ P= 4500N * 2m/s

P= 9000Watts = 9KW
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:
QUESTION: 49

A mercury vapour lamp is the example of

Solution:
QUESTION: 50

The refractive index of a certain glass is 1.5, for a light of wavelength 6000Å . When light (c = 3 x 108 ms−1) passed through this glass, its wavelength is

Solution:
QUESTION: 51

'Mirage' is a phenomenon due to

Solution:
QUESTION: 52

Electronic configuration of Germanium is 2, 8, 18 and 4. To make it extrinsic semiconductor small quantity of antimony is added

Solution:
QUESTION: 53

When the forward voltage is increased in the crystal diode, then the thickness of depletion layer

Solution:
QUESTION: 54

The two bulbs as in the above question are connected in series to a 200 volt line. Then

Solution:
QUESTION: 55

The pair having the same dimensions is

Solution:
QUESTION: 56

The scientific principle involved in laser is

Solution:
QUESTION: 57

In a Young's experiment, two coherent sources are placed 0.90 mm apart and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be

Solution:
QUESTION: 58

When a source of light is receding away from an observer, then the spectral lines will get displaced towards

Solution:
QUESTION: 59

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: 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: A=2t and dx = t^2dthence f=2*2t=4tdw=f.dx=4t*t^2dt=4t^3dtintegrating =t^4 from 0 to 2=16 joules