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# AIIMS MBBS Entrance Test 2019 Physics Paper with Answer & Solutions 25 May First Shift Part 9

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Q-38: The temperature of food material in refrigerator is and temperature of environment is . If Carnot cycle is used in its working gas, then find its Carnot efficiency.

Options:

(1)

(2)

(3)

(4)

Solutions:

Q-39: The graph between velocity and position for a damped oscillation will be.

Options:

(1) Straight line

(2) Circle

(3) Ellipse

(4) Spiral

Solutions:

In damped oscillation, the amplitude will decrease so the graph of will be

Q-40: Assertion: In fission reaction neutrons are required to be slowed down.

Reason: The probability of capture of slow moving neutrons is high for .

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.

Q-41: Assertion: graph is straight line for adiabatic process

Reason: PV = constant for adiabatic process

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.

Solutions:

Is straight line process equation for adiabatic is constant.

Q-42: Assertion: Electron moving perpendicular to will perform circular motion

Reason: Force by magnetic field is perpendicular to velocity

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.

Solutions:

If at all instants then motion will be circular

Q-43: Assertion: A glass ball is dropped on concrete floor can easily get broken compared if it is dropped on wooden floor

Reason: On concrete floor glass, ball will take less time to come to rest

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.

Solutions:

Force exerted by concrete floor is more because change in momentum is fast.

Q-44: Assertion: Distance between position of bright and dark fringe remain same in YDSE

Reason: fringe width

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.