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Physics

Physics
Which of the following device is used to measure humidity?

Anemometer
Hydrometer
Hygrometer
Psycho Meter

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Physics
The ''Greenhouse effect' is mainly due to increase in atmospheric

Sulphur dioxide
Carbon dioxide
Ozone
Nitrogen

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Physics
An oil drop spreads over water because

water has a higher surface tension
Oil is lighter than water
Oil does not mix with water
Oil is more viscous

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Physics
If the diameter of a capillary is doubled, then the rise of water in it will be

Two times
Half
Four times
No change

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Physics
A small gap is left at the joints of rails in a railway track to

Keep the rails equidistant
Avoid the heating of tracks to high temperature
Control the speed of train
Avoid the tracks being distorted due to seasonal temperature variation

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Physics
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

Water, iron and air
Iron, air and water
Iron, water and air
Air, water and iron

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