NEET Physics: Work Energy and Power — MCQ Test 1

Q6. A motor lifts a \( 2500 \, \text{kg} \) load at \( 2.5 \, \text{m/s} \) against friction of \( 3000 \, \text{N} \). What is the power output? (Take \( g = 10 \, \text{m/s}^2 \))

Q7. A \( 4 \, \text{kg} \) mass at \( 15 \, \text{m/s} \) collides elastically with an identical stationary mass. What is the speed of the second mass after collision?

Q8. A motor lifts a \( 2000 \, \text{kg} \) elevator at \( 3 \, \text{m/s} \) against a frictional force of \( 5000 \, \text{N} \). What is the power delivered? (Take \( g = 10 \, \text{m/s}^2 \))

Q9. A \( 1400 \, \text{kg} \) car at \( 22 \, \text{m/s} \) hits a spring (\( k = 1.2 \times 10^4 \, \text{N/m} \)). What is the maximum compression?

Q10. A spring (\( k = 600 \, \text{N/m} \)) is stretched from \( 0.15 \, \text{m} \) to \( 0.25 \, \text{m} \). What is the work done by the spring force?

Q11. A \( 6 \, \text{kg} \) mass is lifted \( 5 \, \text{m} \) in \( 2 \, \text{s} \) at constant speed. What is the power? (Take \( g = 10 \, \text{m/s}^2 \))

Q12. A \( 12 \, \text{kg} \) mass at \( 9 \, \text{m/s} \) collides inelastically with a stationary \( 6 \, \text{kg} \) mass. What is the final speed?

Q13. A force \( \mathbf{F} = 6\hat{\mathbf{i}} + 4\hat{\mathbf{j}} \, \text{N} \) acts on a particle moving along \( \mathbf{d} = -2\hat{\mathbf{i}} + 5\hat{\mathbf{j}} \, \text{m} \). What is the work done?

Q14. A \( 35 \, \text{g} \) bullet at \( 1200 \, \text{m/s} \) emerges from a block with \( 80\% \) of its initial kinetic energy. What is its emergent speed?

Q15. A \( 3 \, \text{kg} \) mass moving at \( 12 \, \text{m/s} \) collides elastically with an identical stationary mass. What is the speed of the first mass after collision?

NEET Physics — Work Energy and Power

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A \( 8 \, \text{kg} \) mass at \( 5 \, \text{m/s} \) collides inelastically with a stationary \( 4 \, \text{kg} \) mass. What is the final speed?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Work Energy and Power. It contains 15 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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15
Medium
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Key concepts covered in this specific test include Collides, Inelastically, Stationary, Compression, Elastically, and Deuterium.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. A \( 8 \, \text{kg} \) mass at \( 5 \, \text{m/s} \) collides inelastically with a stationary \( 4 \, \text{kg} \) mass. What is the final speed?

  • A. 3 m/s
  • B. 3.3 m/s
  • C. 3.6 m/s
  • D. 4 m/s

Q2. A \( 4 \, \text{kg} \) mass falls from \( 6 \, \text{m} \) onto a spring (\( k = 800 \, \text{N/m} \)). What is the maximum compression? (Take \( g = 10 \, \text{m/s}^2 \))

  • A. 0.7 m
  • B. 0.78 m
  • C. 0.85 m
  • D. 0.9 m

Q3. A neutron (\( 1 \, \text{u} \)) at \( 6 \times 10^6 \, \text{m/s} \) collides elastically with a deuterium (\( 2 \, \text{u} \)). What fraction of its kinetic energy is transferred?

  • A. 0.85
  • B. 0.89
  • C. 0.92
  • D. 0.95

Q4. A neutron (\( 1 \, \text{u} \)) moving at \( 10^6 \, \text{m/s} \) collides elastically with a deuterium (\( 2 \, \text{u} \)). What fraction of its kinetic energy is lost?

  • A. 1/12
  • B. 1/9
  • C. 1/6
  • D. 1/3

Q5. A \( 4 \, \text{kg} \) ball at \( 20 \, \text{m/s} \) collides elastically with a stationary \( 12 \, \text{kg} \) ball. What is the speed of the \( 12 \, \text{kg} \) ball after collision?

  • A. 9 m/s
  • B. 10 m/s
  • C. 11 m/s
  • D. 12 m/s

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