The annual world use of energy is……………..
a) 4x1010J
b) 4x1018J
c) 4x1020J
d) 4x1030J
An object of mass 10kg is lifted vertically through a
height of 5m at a constant speed. What is the gravitational potential energy
gained by the object?
a) 590J
b) 490J
c) 690J
d) 790J
Explanation: EG.P.E = mgh
Energy Conversion And Conservation:
According to law of conservation …………. can neither be created nor destroyed in any process.
a) momentum
b) work done
c) force
d) energy
A diver on a spring board is an example of …………..potential energy.
a) spring
b) chemical
c) inelastic
d) elastic
In dam for the generation of electricity when water is stored at certain height possess ………….energy.
a) Kinetic
b) chemical
c) potential
d) electrical
Explanation: potential energy of water which is stored at a certain height is converted into kinetic energy by making it fall on turbine to produce electricity.
