Why water pipes are in danger of bursting in extremely cold weather ?
Because water pipes contract in extremely cold weather.
Because water freezes and hence expands.
Because water exerts greater pressure at lower temperatures.
Because short-range repulsive forces are produced between water' jand pipes.
Why cream separates out when milk is churned ?
Because cream particles are lighter than milk particles.
Because cream particles are heavier than milk particles -
Because the force of adhesion between the molecules of cream and milk is very weak.
Because of none of these reasons.
Why does the moon not have an atmosphere ?
Because all its gases have been attracted by the sun.
Because of extreme variations in temperature on its surface.
Because the magnetosphere of the moon does not allow any gas to enter its atmosphere.
Because its gravitational pull is too weak to hold down gases.
Why ice floats on water ?
Because ice is cooler than water.
Because water exerts an upward pressure on the ice.
Because the surface of water behaves like a stretched membrane.
Because the density of ice is less than that of water.
Why does a thermos flask keep cold liquid cold and belt liquid hot
Because of a special inner lining in the thermos flask.
Because the thermos flask is double-walled and the spacee, inbetween contains air under pressure.
Because the walls of the thermos flask are very thick.
Because thermos flask is constructed in such a way that heat can neither leave the flask nor enter the flask.
The energy possessed by a body, due to its motion, is known as
A lump of ice floaft In a vessel of ice-cold water. How the level of water will be affected when ice melts completely?
The level will fall.
The level will rise.
The level will remain unchanged.
None of these.
Why is it easier to lift a heavy stone under water than in air ?,
Because the gravitational pull of the earth is less in water than in air.
Because water offers comparatively less resistance to the motion of the stone.
Because water cools the stone.
Because there is an apparent loss in weight, of the stone, in water.
How the weight of a body changes when it is brought to the mom"s surface from earth ?
It may or may not change.
It does not change.
How will you distinguish between a raw egg and the one that has been hard boiled in its shell ?
Each egg is given a spin on the table. The hard boiled egg will spin longer and faster than the raw egg.
Place both the eggs in glycerine for some time. When they are taken out, the shell of the raw egg would show a greenish yellow tinge.
Each egg is given a spin on the table. The raw egg will spin longer and faster than the hard boiled egg.
They can be distinguished only by breaking the shell.
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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