Generating electricity by means of heat produced by burning of fossil fuels like coal, gas is called………..
a) thermal power
b) hydroelectric power
c) wind power
d) all of these
Generating electricity by means of solar energy is called…………
a) thermal power
b) hydroelectric power
c) wind power
d) solar power
Light is a form of………
a) heat
b) vibration
c) energy
d) none of these
Prism is a………….-dimensional transparent object, which divides light into different colors.
a) two
b) three
c) four
d) five
How many colors in sunlight?
a) 3
b) 5
c) 7
d) 9
After rain when sunlight passes through water droplets, they divide it into seven colors is called……….
a) prism
b) rainbow
c) indigo
d) all of these
