Work is said to be done when __________ produces displacement of a body.
force
energy
distance
speed
Which one of the following energies can be replenished?
Solar energy
Wind energy
Water energy
All of the above
Electrical energy can be produced by
coal
water
uranium
all of the above
The energy used for cycling comes from
the chemical energy of food
the heat energy of our body
the sound energy
the light energy
The above transformation takes place in
electric bulb
electric heater
battery cell
solar cell
The capacity to do work is called
machine
movement
Which energy conversion takes place during photosynthesis?
Heat energy to Light energy
Light energy to Heat energy
Light energy to Chemical energy
Heat energy to Chemical energy
Which one of the following statements is NOT true?
Friction makes a moving object slow down and stop
Friction between two surfaces will make them hot
Friction also enables an object to stay in a stationary position
Friction decreases if roughness of an object increases
In the battery cell, the energy is stored in the form of
electrical energy
muscular energy
chemical energy
solar energy
The ultimate source of our energy is
sun
wind
plants
