# AIIMS MBBS Entrance Test 2019 Physics Paper with Answer & Solutions 25 May First Shift Part 5

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Q-20: A disc of radius and mass half is rolling on an inclined plane. Find out friction force so that disc performs pure rolling.

Options:

(1)

(2)

(3)

(4)

Answer: (2)

Solutions:

.

Or

So

Q-21: If temperature of, radius of Sun is, radius of & distance between earth and. Find intensity of light on Earth.

Options:

(1)

(2)

(3)

(4)

Answer: (1)

Solutions:

Total energy emitted by

Energy received by earth

Q-22: If radius of. Find the time of relaxation.

Options:

(1)

(2)

(3)

(4)

Answer: (2)

Solutions:

Now

So