# SAMPLE PHYSICS QUESTIONS FROM PAKPREP.COM

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Topic:

Fluid Dynamics

Question:

Water hose with internal radius of 0.01m has water flowing at the rate of 10 kg per 20s. What is the water speed at the outlet? Density of water is 1000 kg/m3.

Options:

• 6m/s
• 8m/s
• 1.6m/s
• 8m/s

Correct Option:

1.6m/s

Explanation:

From continuity equation A*V = flow rate of water = volume/s;

Volume/s = mass/s * density = 0.5/1000;

A*V = 0.5/1000; A = 3.14 * (0.01)2;

V = 0.5/ (3.14*(0.01)2*1000) = 1.6m/s

Topic:

Electromagnetism

Question:

The material used in florescent screen of CRO is?

Options:

• Magnesium
• Glass
• Phosphor
• Sodium

Correct Option:

Phosphor

Explanation:

A phosphor, most generally, is a substance that exhibits the phenomenon of luminescence. Somewhat confusingly, this includes both phosphorescent materials, which show a slow decay in brightness (>1 ms), and fluorescent materials, where the emission decay takes place over tens of nanoseconds.

### 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