Question

The SI unit of work done is : [ ]

a) erg b) joule c) eV d) kWh

10. Formula for calculating potential energy is : [ ]

a) Weight × Vertical distance b) Force × displacement

c) Weight

vertical distance d)

Force

displacement

11. In the given diagram the stretched spring possess _____________ energy [ ]

a) Kinetic

b) Potential

c) Both potential and kinetic

d) heat

12. The kinetic energy of a body depends : [ ]

a) on its mass only b) on its speed only

c) on its mass as well as on its speed d) neither on its mass nor on its speed

13. Gravitational potential energy GPE = [ ]

a) mgh b) gmn c) ½mv2 d) all the above

14. Work is said to be done when : [ ]

a) object gets displaced b) object is in constant c) both a and b d) none of these

15. Match the following : [ ]

Column – I Column – II

a) Potential energy p)

1

2 mv2

b) Kinetic energy q) mgh

c) Mechanical energy r) Potential energy + kinetic energy

s) joule

The correct one is :

a) a – q, s; b – p, s; c – r, s b) a – q; b– p, r; c – s

c) a – q; b – p; c – r d) a – r; b – q; c – q

APPLICATION SKILL ACHIEVER

Choose the correct Answer :

1. A particle of mass 100 g moves at a speed of 1 m/s. Its kinetic energy is : [ ]

a) 50 J b) 5 J c) 0.5 J d) 0.05 J

2. When body is not displaced after applying force, then the work done is: [ ]

a) positive b) negative c) zero d) undefined

3. In the case of a freely falling body : [ ]

a) Potential energy decreases b) Kinetic energy increases

c) Kinetic energy decreases d) both a and b​

Answer 1

1.joule

2.mgh

3.both potential and kinetic energy

4.on it's mass as well as speed

5.mgh

6.objects get displaced