We know that the continuous heating and cooling of rocks broke them down into small pieces. Which of the following is responsible for continuous heating and cooling?
Air and water
Sunlight and rains
Plants and trees
Plants and animals
Which of the following statements is wrong?
Snow and ice are both the same forms of water
On heating, water changes into steam
Evaporation and condensation are reverse of each other
On heating water changes into ice
Mr. Verma reuses water which was used to wash vegetables to water his plants. He is practising ___________ of water.
pollution
conservation
evaporation
desalination
When we boil water in a kettle, steam comes out of the kettle. Steam is __________ form of water.
solid
liquid
gaseous
none of these
Which of the following is the hardest layer of the soil?
Top soil
Sub soil
Bedrock
Sand
Loam contains:
very fine grains which stick together.
equal amounts of sand and clay.
large grains with lots of spaces between them.
grains which do not hold either water or air.
Water changes its state depending on its
size
volume
shape
temperature
Which soil is best for the growth of plants?
Gravel
Loam
Clay
Gopal took a small quantity of soil in a jar and poured some water on it. Then he has observed air bubbles coming up. This shows that:
soil has water in it.
trapped air is present in the soil.
soil contains clay and water.
different types of soil have different sizes.
The depletion in the ozone layer is caused by
nitrous oxide
carbon dioxide
chlorofluorocarbons
methane
