Why are cloudy nights warmer ?
Because clouds do not allow radiation of heat from earth. Thus, only very less heat escapes into the atmosphere.
Because clouds emit heat radiations.
Because cool light of the moon is obstructed by the clouds.
None of these.
Moon is a natural satellite of the earth. In how many weeks it completes one orbit around the earth ?
Why rain water is soft but river water is hard ?
Because rain water is free from chemical impufities and river water contains carbonates and chlorides of magnesium and calcium.
Because rain water contains carbonates and chlorides of magnesium and calcium while the river water is freeftom all chemical impurities.
Because rain water contains carbonates of magnesium while the river water contains chlorides of calcium.
Because rain water contains chlorides of magnesium while the river water contains sulphates of calcium.
Why lightni ng coinductors are fixed at the top of high buildings ?
Because they protect the building from the destructive effects of lightning.
Because they protect the building from cosmic radiations.
Because they protect the building, during summer, from excess heat.,
Because they receive radio and television waves.
What is the main constituent of the sun ?
Which of the following statements is incorrect about ultra-sonics ?
These are sounds whose frequencies are higher than 20,000 cycles per second.
These are inaudible to the human ear.
Bats produce ultra-sonic sounds.
Ultra-sonic sounds are produced when ultra-violet light is incident on sea-water.
Why does a green object look green ?
Because green object absorbs no colour.
Because green object absorbs all the colours except green. Green colour is reflected. Therefore, the object looks green.
Because green object absorbs only the green light and rejects all other colours.
Because of none of these.
Why light, passing thrcugh a glass prism, produces a coloured pattern on the wall ?
Because some colours are absorbed by the wall while others are reflected by the wall.
Because white light, on striking against the wall, is split into seven colours.
Because white light, on passing through a prism is split into seven colours.
None of these.
Why does not all the ink run out of fountain pen when it is left wwiitthh nib downwards and the cover off ?
Because of a valve in the pen.
Because ink is too viscous to flow out.
Because the atmospheric pressure outside the pen is greater than the pressure inside the pen tube.
Because the atmospheric pressure outside the pen is less than inside the pen tube.
The outer covering of the flower is called
none of these.
1. World Geography -Test-01
2. World Geography -Test-02
3. World Geography -Test-03
4. Geography of India -Test-01
5. Geography of India -Test-02
6. Geography of India -Test-03
7. Geography of India -Test-04
8. Geography of India -Test-05
9. History of India - Test - 01
10. History of India - Test - 02
11. History of India - Test - 03
12. History of India - Test - 04
13. History of India - Test - 05
14. History of India - Test - 06
15. History of India - Test - 07
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