Question Paper
Class / Subject: Class 9 (CBSE) · Science
Chapter: Chapter 10 — Chapter 10: Work and Energy
Time Allowed: 15 minutes
Max Marks: 6
1. Work is calculated as: [1]
(A) Force × displacement
(B) Force × time
(C) mass × acceleration
(D) Force ÷ time
2. No work is done, scientifically, when: [1]
(A) there is no displacement despite applied force
(B) force and displacement are in the same direction
(C) an object moves freely
(D) energy is transferred
3. The SI unit of work is the: [1]
(A) joule
(B) newton
(C) watt
(D) metre
4. Kinetic energy is calculated as: [1]
(A) ½mv²
(B) mgh
(C) mv
(D) m/v
5. Potential energy is calculated as: [1]
(A) mgh
(B) ½mv²
(C) Fd
(D) m/g
6. Calculate the potential energy of a 2kg object at a height of 5m (g=9.8 m/s²): [1]
(A) 98 J
(B) 49 J
(C) 19.6 J
(D) 9.8 J