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NEET UG Unit 3A: Work and Kinetic Energy Theorem — practice questions — page 2

Explore 47 free Unit 3A: Work and Kinetic Energy Theorem questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 3A: Work and Kinetic Energy Theorem questions and exercises with answers

Showing questions 31–47 of 47.

As per your syllabus, after 2 m of cord unwinds at 25 N pull, the work done by the pull is which?Read the answer and worked solution →As per your syllabus, the work done by an external torque equals which?Read the answer and worked solution →Inertia of a body depends on its:Read the answer and worked solution →Newton's first law holds in:Read the answer and worked solution →If F = 20 N acts on m = 4 kg, acceleration is:Read the answer and worked solution →Action-reaction pairs act on:Read the answer and worked solution →Rolling friction compared to sliding friction is:Read the answer and worked solution →Match each SI unit to the quantity it measures.Read the answer and worked solution →Match each kinematic equation to what it computes (constant a).Read the answer and worked solution →Pop only the good thermal conductors.Read the answer and worked solution →Match each SI unit to the quantity it measures.Read the answer and worked solution →Match each kinematic equation to what it computes (constant a).Read the answer and worked solution →Pop only the good thermal conductors.Read the answer and worked solution →Newton's second law of motion.Read the answer and worked solution →Ohm's law.Read the answer and worked solution →Kinetic energy formula.Read the answer and worked solution →NEET · Physics · Quantity ↔ DimensionRead the answer and worked solution →

Worked practice questions

As per your syllabus, after 2 m of cord unwinds at 25 N pull, the work done by the pull is which?

  1. 100 J
  2. 12.5 J
  3. 25 J
  4. 50 J
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Correct answer: D. 50 J

syllabus Ex 6.12(b): W = F × distance = 25 × 2 = 50 J. Equals KE gained (energy conservation).

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As per your syllabus, the work done by an external torque equals which?

  1. Heat dissipated
  2. Loss due to friction
  3. Zero in steady rotation
  4. The change in rotational KE
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Correct answer: D. The change in rotational KE

Your syllabus: no internal motion, no friction ⇒ τω = d/dt((1/2)Iω²) ⇒ W_ext = ΔK_rot. Work-energy theorem in rotation.

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Inertia of a body depends on its:

  1. Mass
  2. Position
  3. Velocity
  4. Acceleration
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Correct answer: A. Mass

### Step 1: Understanding Inertia Inertia is the inherent property of a body by virtue of which it resists any change in its state of rest or uniform motion in a straight line. It is not a force, but a property of matter. ### Step 2: Relate to Newton's First Law Newton's First Law of Motion, often called the **Law of Inertia**, states that an object will remain at rest or move with constant velocity unless acted upon by an external force. The magnitude of this resistance depends on the amount of matter in the object. ### Step 3: Identify the Quantitative Measure In classical mechanics, the mass ($m$) of an object is the quantitative measure of its inertia. - A larger mass requires a larger force to achieve the same acceleration ($F = ma$). - Inertia does not depend on the object's speed ($v$), its position, or the acceleration ($a$) it is currently experiencing. Therefore, the inertia of a body depends solely on its **mass**.

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