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Indian Navy SSR (Sailor) Kinetic Theory — practice questions

Explore 3 free Kinetic Theory questions in Indian Navy SSR (Sailor) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Kinetic Theory questions and exercises with answers

Showing questions 1–3 of 3.

The mean translational kinetic energy of one molecule of an ideal gas at temperature $T$ is: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 →As per your syllabus, a body moving on it must do which?Read the answer and worked solution →

Worked practice questions

The mean translational kinetic energy of one molecule of an ideal gas at temperature $T$ is:

  1. $\dfrac{1}{2} kT$
  2. $kT$
  3. $\dfrac{3}{2} kT$
  4. $3 kT$
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Correct answer: C. $\dfrac{3}{2} kT$

Equipartition theorem: each translational degree of freedom contributes $\dfrac{1}{2} kT$ of energy. There are 3 translational degrees ($x, y, z$) so total mean translational KE per molecule is $\dfrac{3}{2} kT$. For a mole: $\dfrac{3}{2} RT$. If the molecule has internal degrees (rotation, vibration), more energy is stored — but those don't add to **translational** KE specifically.

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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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As per your syllabus, a body moving on it must do which?

  1. Reverse its direction
  2. Decelerate and stop
  3. Continue with constant velocity
  4. Continually accelerate forward
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Correct answer: C. Continue with constant velocity

Your syllabus: no horizontal force ⇒ no acceleration ⇒ constant velocity. This is Galileo's inertia law.

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