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

Correct Answer:

All of these

Explanation:

The sum of the individual masses of the parts of a nucleus is less than their mass when they are bound into the nucleus producing mass defect. The mass from the mass defect is converted into the energy that holds the nucleus together and is released in fission. Fusion also produces energy when individual nuclei are forced to combine (fusion) and form new elements in a process that produces energy.

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