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Work, Energy and Power Practice Questions - Page 2

Questions 11–20 of 38 · Page 2 of 4

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Questions
38
Solutions
All inline
Q11A force of 20 N moves a body 5 m in its direction. Calculate the work done.MediumSolve →Q12If a machine’s efficiency is 80% and input power is 500 W, its useful output power is:MediumSolve →Q13A bullet hits a wall and stops. Its kinetic energy is converted into:MediumSolve →Q14A car doubles its speed. Its braking distance becomes:MediumSolve →Q15Which of these machines works on the conservation of energy?MediumSolve →Q16If net external force on a system is zero, then its:MediumSolve →Q17In a projectile motion, which statement is correct? 1. Work done by gravity is zero. 2. Kinetic energy is maximum at the highest point. 3. Total mechanical energy is conserved.MediumSolve →Q18Which force does not change the mechanical energy of a system?MediumSolve →Q19Which option correctly relates power and work?MediumSolve →Q20Which of the following represents the correct unit equivalence?MediumSolve →
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