The process of water vapour cooling down is called:
freezing
condensation
evaporation
melting
The instrument used to know the direction of wind is:
windmill
weathercock
barometer
thermometer
What do you see when you boil water in a kettle?
Smoke rising into the air
Steam rising into the air
Ice on the outside of the kettle
Nothing happens
What does the figure given below represent?
River cycle
Path of germs in air
Formation of clouds
Water cycle
Windmills are used to:
pump water
produce electricity
grind grains
all of the above
Observe the figure carefully. What will happen if a glass is put over a burning candle?
The candle keeps burning
The candle goes off
The candle shrinks in size
None of these
Fast and strong winds are called:
breeze
storm
wind
earthquakes
Evaporation is:
changing ice into water by heating
changing ice into water vapour by heating
changing water into ice by cooling
changing water into water vapour by heating
When the Earth is seen from outer space, it looks mainly blue. This is because most of the Earth is covered with:
ice
mountains
oceans
desert
Which of these activities does NOT need wind?
A windmill rotating
A boat sailing in the sea
A parachute in the sky
