Multiple Choice Questions

Multiple Choice Questions

Q.1. When a coil spring is compressed, the work is done on the spring. The elastic potential energy: 
(a) increases 
(b) decreases
(c) disappears
(d) remains unchanged
Q.2. Potential energy of a person is minimum when : 
(a) person is standing
(b) person is sitting on a chair
(c) person is sitting on the ground
(d) person is lying on the ground
Q.3. No work is done when :
(a) a nail is hammered into a wooden box
(b) a box is pushed along horizontal floor
(c) there is no component of force, parallel to the direction of motion
(d) none of these
Q.4. When the speed of a moving object is doubled, its : 
(a) acceleration is doubled
(b) weight is doubled
(c) kinetic energy is doubled
(d) kinetic energy increases 4 times
Q.5. When a stone of mass ‘m’ falls through a vertical height ‘d’, the decrease in the gravitational energy is :
(a) mg/d
(b) mg2/2
(c) mgd
(d) md/g
Q.6. A 1 kg mass has a kinetic energy of 1 joule when its / speed is :
(a) 0.45 m s-1
(b) 1 m s-1
(c) 1.4 m s-1
(d) 4.4 m s-1
Q.7. An iron sphere of mass 30 kg has the as an aluminium sphere whose mass is 10.5 kg. The spheres are dropped simultaneously from a cliff. When they are 10 m from the ground, they have the same : 
(a) acceleration 
(b) momentum
(c) potential energy
(d)  kinetic energy
Q.8. An object of mass 1 kg has a potential energy of 1 joule relative to the ground when it is at a height of: 
(a) 0.102 m 
(b) 1 m
(c) 9.8 m
(d) 32 m
Q.9. An object of mass 5 kg falls from a height of 5 m above the ground. The loss of potential energy of the mass is :
(a) 250 J
(b) 25 J
(c) 2.5 kJ
(d) 50 J
Q.10. A weightlifter lifts 240 kg from the ground to a height of 2.5 in 3 second. The average power is : 
(a) 1960 W 
(b) 19.6 kW
(c) 1.96 MW
(d) 196 W
Q.11. When a force retards the motion of a body, the work done is :
(a) positive
(b) zero
(c) negative
(d) uncertain
Q.12. The work done by a force on a body will be positive if the :
(a) body does not move
(b) body moves perpendicular to the direction of motion
(c) body moves along the direction of the applied force
(d) body moves opposite to the direction of the applied force
Q.13. The cgs unit of work is :
(a) joule
(b) erg
(c) dyne
(d) watt
Q.14. One joule work is said to be done when : 
(a) a force of 1 N displaces a body by 1 cm
(b) a force of 1 N displaces a body by 1 m 
(c) a force of 1 dyne displaces a body by 1 m
(d) a force of 1 dyne displaces a body by 1 m
Q.15. The speed of a particle is doubled, its kinetic energy: 
(a) remains same
(b) becomes double
(c) becomes four times
(d) becomes half

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