A radio set of 60 watts runs for 50 hours.How many 'units ' (kWh) of electrical energy is consumed ?
6 kWh
4 kWh
3 kWh
30 kWh
A compressed spring possesses
Kinetic energy
Elastic potential energy
Electrical energy
Magnetic energy
Find the energy possessed by an object of mass 10 kg when it is at a height of 6 m above the ground.Given,g = 9.8 m / s2
588 J
688 J
858 J
600 J
The energy possessed by a body due to its motion is called
Potential energy
Static energy
Mechanical energy
A force of 7N acts on an object. The displacement is 8m in the direction of force. What is the work done?
24 J
56 J
54 J
64 J
By what factor does the kinetic energy of a particle increase if the velocity is increased by a factor of three?
6
7
8
9
Two bodies of equal weight are kept at heights of h and 1.5 h respectively.The ratio of their P.E. is
1:2
2:3
1:3
2:4
The energy used in households, industries and commercial establishments are usually expressed in
Joule
Watt
Kilowatt - hour
Volt
A boy of mass 50 kg runs up staircase of 45 steps in 9 s. If the height of each step is 15 cm, find his power. Take g = 10 m s-1
400 W
275 W
375 W
575 W
A porter lifts a luggage of 15 kg from the ground and pats it on his head 1.5 m above the ground. Calculate the work done by him on the luggage.
250 J
235 J
225 J
215 J
