The capacity to do work is called
force
energy
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 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
A football kicked by a boy rolls on the ground to some distance and stops. The force which stops the ball is
muscular force
gravitational force
mechanical force
frictional force
The force which pulls a body towards the earth is called
friction
gravity
tension
collision
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
While playing football, the ball is passed from player to player at different speeds. It is possible because of
players expertise
the ground
gravitational pull
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
On the removal of heat energy from water we get
steam
vapours
ice
dew
Work is said to be done when __________ produces displacement of a body.
distance
speed
