# SAMPLE PHYSICS QUESTIONS FROM PAKPREP.COM

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Topic:

Modern Physics

Question:

If energy of photon is 5 MeV. Kinetic energy of particles after pair production is?

Options:

• 4 MeV
• 5 MeV
• 6 MeV
• Not enough information given

4 MeV

Explanation:

Energy of photon = Energy required for pair production + KE of particles. Now energy required for pair production is 1.02 MeV so KE is approximately equal to 5-1 = 4 MeV.

Topic:

Physics of solids

Question:

A piece of Cu and another of Ge are cooled from room temp to -1500 C. The resistance of?

Options:

• Each of them increases
• Cu increases and that of Ge decreases
• Cu decrease and that of Ge increases
• Each of them decreases

Cu decrease and that of Ge increases

Explanation:

The resistivity of semiconductors increases with a decrease in the temperature while for conductors it decrease with a decrease in the temperature. As opposed to metals, semiconductors have high negative temperature.

Topic:

Nuclear physics

Question:

The energy obtained in a nuclear reaction is derived from:

Options:

• Mass defect and binding energy
• Fission
• Fusion
• All of these