Classical Mechanics

JKPSC Assistant Professor (Physics) · Physics · 64 practice questions with answers and explanations: 10 Easy, 54 Medium, 0 Hard.

Sample questions

Sample Easy question 1

A satellite in a circular orbit is acted upon by:

  1. No force
  2. An outward force
  3. Gravitational force towards the centre
  4. A tangential force
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Answer: C. Gravity provides the centripetal force.

Sample Easy question 2

In a conservative system with a symmetry under time translation, which quantity is conserved?

  1. Charge
  2. Angular momentum
  3. Linear momentum
  4. Energy
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Answer: D. Noether's theorem.

Sample Easy question 3

Coriolis force acts on a body moving in a rotating frame and is:

  1. Along the axis of rotation always
  2. Parallel to the velocity
  3. Zero
  4. Perpendicular to the velocity
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Answer: D. F = −2m(Ω × v).

Sample Medium question 4

The scattering cross-section has the dimension of:

  1. Area
  2. Mass
  3. Time
  4. Length
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Answer: A. It is measured in barns in nuclear physics.

Sample Medium question 5

The Rutherford scattering cross-section varies as:

  1. 1/sin⁴(θ/2)
  2. sin θ
  3. cos θ
  4. Constant
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Answer: A. It is for the Coulomb force.

Sample Medium question 6

The moment of inertia of a solid sphere of mass M and radius R about a diameter is:

  1. (2/3)MR²
  2. MR²
  3. (1/2)MR²
  4. (2/5)MR²
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Answer: D. A hollow sphere has (2/3)MR².

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