Engineering Mechanics

JKSSB Junior Engineer (Mechanical) · Technical Subjects (Mechanical) · 14 practice questions with answers and explanations: 5 Easy, 8 Medium, 1 Hard.

Sample questions

Sample Easy question 1

Impulse of a force equals the change in:

  1. Momentum
  2. Kinetic energy
  3. Potential energy
  4. Velocity only
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Answer: A. Impulse is force times the time it acts.

Sample Easy question 2

Newton's second law of motion states that:

  1. A body stays at rest unless acted on
  2. Energy is conserved
  3. Force equals mass times acceleration
  4. Every action has an equal and opposite reaction
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Answer: C. F = ma.

Sample Easy question 3

The moment of a force about a point is:

  1. Force divided by distance
  2. Mass times velocity
  3. Force times the perpendicular distance from the point
  4. Force times time
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Answer: C. Its unit is N·m.

Sample Medium question 4

The centroid of a triangle of height h lies at what distance from the base?

  1. h / 2
  2. h / 4
  3. 2h / 3
  4. h / 3
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Answer: D. It is where the medians meet.

Sample Medium question 5

The parallel axis theorem states that I = ?

  1. I_G / A·h
  2. I_G + A·h²
  3. I_G − A·h²
  4. A·h / I_G
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Answer: B. I_G is about the centroidal axis and h is the distance between the axes.

Sample Medium question 6

For a projectile launched at a fixed speed on level ground, the range is greatest at an angle of:

  1. 30°
  2. 90°
  3. 60°
  4. 45°
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Answer: D. R = u² sin 2θ / g is maximum when 2θ = 90°.

Sample Hard question 7

The centre of gravity of a semicircular lamina of radius R lies from its diameter at:

  1. R / π
  2. 2R / 3
  3. 4R / 3π
  4. R / 2
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Answer: C. It lies on the axis of symmetry.

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