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Indian Navy AA (Artificer Apprentice) Magnetism and Matter — practice questions

Explore 3 free Magnetism and Matter questions in Indian Navy AA (Artificer Apprentice) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetism and Matter questions and exercises with answers

Showing questions 1–3 of 3.

For a body on a horizontal surface, the NORMAL FORCE N equals:Read the answer and worked solution →A 5 kg block is pushed with 30 N along a frictionless surface. Acceleration:Read the answer and worked solution →Two equal masses (3 kg each) connected by a light string over a frictionless pulley. One on smooth horizontal table, other hangs over edge. Acceleration?Read the answer and worked solution →

Worked practice questions

For a body on a horizontal surface, the NORMAL FORCE N equals:

  1. mg/2
  2. mg (weight)
  3. 2mg
  4. Zero
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Correct answer: B. mg (weight)

For a body at rest on a horizontal surface, N must balance gravity: N = mg. (If inclined, N = mg cos θ; if accelerating vertically, N changes accordingly.)

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A 5 kg block is pushed with 30 N along a frictionless surface. Acceleration:

  1. 0.17 m/s²
  2. 2 m/s²
  3. 6 m/s²
  4. 150 m/s²
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Correct answer: C. 6 m/s²

We have a = F/m. That is a = 30/5. So a = 6 m/s². On frictionless surface, all applied force goes into acceleration.

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Two equal masses (3 kg each) connected by a light string over a frictionless pulley. One on smooth horizontal table, other hangs over edge. Acceleration?

  1. g/2 = 5 m/s²
  2. g/4 = 2.5 m/s²
  3. g = 10 m/s²
  4. Zero
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Correct answer: A. g/2 = 5 m/s²

**Hanging mass:** T = m(g - a). Mass on table: T = ma. **Equating:** m(g - a) = ma → g - a = a → a = g/2 = 5 m/s². (Atwood-like setup with no friction.)

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