# AIIMS MBBS Entrance Test 2019 Physics Paper with Answer & Solutions 25 May First Shift Part 4

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Q-16: If sink and source temperature of a refrigerator are and respectively. Then efficiency of refrigerator is:

(1)

(2)

(3)

(4)

Answer: (2)

Solutions:

Q-17: In an isothermal process water drops of radius are combined to form a bigger drop. Find the energy change in this process if

Options:

(1)

(2)

(3)

(4)

Answer: (2)

Solutions:

By volume conservation

Q-18: The given transistor operates in saturation region then what should they be value of VBB:

Options:

(1)

(2)

(3)

(4)

Answer: (3)

Solutions:

Q-19: Body A of mass m moving with speed collides with another body of mass at rest the collision is head on and elastic in nature. After the collision the fraction of energy lost by colliding body A is:

Options:

(1)

(2)

(3)

(4)

Answer: (3)

Solutions:

Energy transferred to initial energy of

Final velocity of

Fraction of energy lost