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NPCC Engineer Physics — practice by topic

Browse 30 questions across 3 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physics topics

Engineering Services (30)Physics (30)Static Equilibrium and Elasticity (30)

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A rigid body at rest in the chosen frame of reference is said to be in:Read the answer and worked solution →A body at rest for one observer may be moving steadily for another because motion is:Read the answer and worked solution →The first condition of equilibrium requires that the net external force be:Read the answer and worked solution →The second condition of equilibrium requires that the net external torque be:Read the answer and worked solution →

Worked practice questions

A rigid body at rest in the chosen frame of reference is said to be in:

  1. Static equilibrium
  2. Steady equilibrium
  3. Stable equilibrium
  4. Simple equilibrium
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Correct answer: A. Static equilibrium

1. The body neither moves nor rotates. 2. That state is judged in one chosen frame. 3. It is static equilibrium. _Source: OpenStax University Physics Volume 1, Chapter 12, Static Equilibrium and Elasticity._

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A body at rest for one observer may be moving steadily for another because motion is:

  1. Restricted
  2. Relative
  3. Reversible
  4. Repeatable
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Correct answer: B. Relative

1. Two observers can disagree about being at rest. 2. Each judgement depends on the frame used. 3. So motion is relative. _Source: OpenStax University Physics Volume 1, Chapter 12, Static Equilibrium and Elasticity._

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The first condition of equilibrium requires that the net external force be:

  1. Exactly zero
  2. Very large
  3. Straight up
  4. Ever growing
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Correct answer: A. Exactly zero

1. Any unbalanced force would accelerate the body. 2. Equilibrium forbids that acceleration. 3. So the net force must be exactly zero. _Source: OpenStax University Physics Volume 1, Chapter 12, Static Equilibrium and Elasticity._

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