Study of the energy transformations shown here. In which of the following cases is this taking place?
Glowing of an electric torch
Photosynthesis in plants
Generation of electricity in windmills
Burning of woods
The ultimate source of our energy is
sun
coal
wind
plants
Which one of the following cannot be done by using muscular force?
Changing the direction of a moving body
Stopping a moving body
Changing or decreasing the speed of a body
Increasing or decreasing the speed of a body
The above transformation takes place in
electric bulb
electric heater
battery cell
solar cell
When a bomb explodes, it converts
heat energy to light and sound energy
chemical energy to heat, light and electrical energy
chemical energy to heat, light and sound energy
heat energy to electrical, sound and light energy
The capacity to do work is called
force
energy
machine
movement
Work is said to be done when __________ produces displacement of a body.
distance
speed
On the removal of heat energy from water we get
steam
vapours
ice
dew
An electrical heater converts
heat energy to electrical energy
electrical energy to heat energy
light energy to electrical energy
electrical energy to muscular energy
In which one of the following activities is force used for pulling?
Blowing air into a balloon
Cycling
Stretching a rubber band
None of these
