AIIMS MBBS Entrance Test 2019 Physics Paper with Answer & Solutions 25 May First Shift Part 10

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Q-45: Assertion: Paramagnetic substances get poorly attracted in magnetic field.

Reason: Because magnetic dipoles are aligned along external magnetic field weakly

Options:

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of assertion.

(3) If assertion is true but reason is false.

(4) If both assertion and reason are false.

Answer: (1)

Q-46: Assertion: Heavy water is used to slow down nuclear reactor

Reason: It does not react with slow speed neutron and mass of deuterium is comparable to the neutron

Options:

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of assertion.

(3) If assertion is true but reason is false.

(4) If both assertion and reason are false

Answer: (1)

Q-47: Assertion: Collision between two billiard’s balls are inelastic

Reason: Momentum remains conserve during the collision

Options:

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of assertion.

(3) If assertion is true but reason is false.

(4) If both assertion and reason are false.

Answer: (2)

Solutions:

Billiard’s ball is not perfect elastic body. Some part of initial kinetic energy is lost in form of deformation energy and momentum remains conserved during every collision.

Q-48: Assertion: Rayleigh scattering can be considered as elastic collisions of photons with massive particles.

Reason: In Rayleigh scattering, the energy of incident and scattered is same

Options:

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of assertion.

(3) If assertion is true but reason is false.

(4) If both assertion and reason are false.

Answer: (1)

Solutions:

In Rayleigh scattering, when a photon (of momentum P) collide with a very massive particles (of mass m) (distant particles, etc.) then the momentum transferred will be

So energy transferred is which will be very small.

Q-49: Assertion: FM broadcast is better than AM broadcast.

Reason: Noise change is maximum in amplitude of AM waves.

Options:

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of assertion.

(3) If assertion is true but reason is false.

(4) If both assertion and reason are false.

Answer: (1)

Solutions:

FM broadcast is better than AM broadcast because in AM broadcast electric signals superimpose with main signal.

Q-50: Assertion: In adiabatic process, work is independent of path.

Reason: In adiabatic process, work done is equal to negative of change in internal energy.

Options:

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of assertion.

(3) If assertion is true but reason is false.

(4) If both assertion and reason are false.

Answer: (1)

Solutions:

For adiabatic process

Q-51: Assertion: Water drops take spherical shape when falling freely.

Reason: Water has minimum surface tension among all liquids.

Options:

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of assertion.

(3) If assertion is true but reason is false.

(4) If both assertion and reason are false.

Answer: (4)

Solutions:

Water drops take oval shape when falling freely. Surface tension of water is not minimum among all liquids.

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