Conservation of Mechanical Energy MCQs
Practice Conservation of Mechanical Energy multiple-choice questions from Work, Energy, and Simple Machines (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Conservation of Mechanical EnergyQuiz - Solve & Score
Q1. Energy can neither be created nor destroyed. This is the law of:
- A.conservation of energy
- B.conservation of momentum
- C.inertia
- D.gravitation
Answer: A. conservation of energy
Concept involved: It is the law of conservation of energy. Connecting concept to answer: Correct. Wrong options at a glance: option B) 'conservation of momentum' is incorrect: About momentum; option C) 'inertia' misses the point - Newton's first law; option D) 'gravitation' doesn't hold - A force law. Therefore the correct option is A) conservation of energy.
Q2. Find the impact speed of a 1 kg body falling freely from 45 m (g=10):
- A.30 m/s
- B.900 m/s
- C.21.213 m/s
- D.450 m/s
Answer: A. 30 m/s
Given 1 kg, 45 m, asked for Find the impact speed of a 1 kg body falling freely from 45 m (g=10). By v = u + a*t or s = u*t + (1/2)*a*t^2. v = u + a*t or s = u*t + (1/2)*a*t^2 → so the required answer = 30 m/s. write the kinematic relation that links the named quantities, e.g. Therefore option A) 30 m/s. Others fail: option B) '900 m/s' is wrong because Wrong: a step was skipped or a unit not converted; option C) '21.213 m/s' doesn't hold - Wrong: this uses an incorrect intermediate result.
Q3. Find the impact speed of a 2 kg body falling freely from 5 m (g=10):
- A.10 m/s
- B.100 m/s
- C.7.071 m/s
- D.50 m/s
Answer: A. 10 m/s
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