PU CSS 2026 Work and Energy Free Quiz 2

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PU CSS 2026 Work and Energy Free Quiz 2

PU CSS Quiz

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Navigator 5 Q

General

General 5 MCQs

11. What does the law of conservation of energy state?

A. Energy cannot be created or destroyed B. Momentum is conserved C. Mass is conserved D. Charge is conserved

12. What remains constant in the absence of external forces?

A. KE remains constant B. KE + PE remains constant C. PE remains constant D. Total energy changes

13. What happens to energy when a ball is thrown upward?

A. KE increases throughout B. PE decreases throughout C. KE converts to PE and vice versa D. Energy is lost

14. What is the formula for efficiency?

A. (Output / Input) × 100% B. (Input / Output) × 100% C. (Output × Input) × 100% D. (Input - Output) / Input × 100%

15. What is the efficiency of a machine with output work 80 J and input work 100 J?

A. 20% B. 80% C. 100% D. 50%

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