Physics
The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?

2.0958333333333
1.0479166666667
0.12847222222222
0.21041666666667

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Physics
Specific gravity is defined as the ratio of

Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 4°C
Density of the substance to the density of water
Density of the substance to the density of water at 0°C

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Water in the pipes freezes and on freezing water expands, so pipes break
Frost makes the pipes rusty, so they break
None of these
The material of which pipes are made contracts due to cold and so breaks

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Physics
Kinetic energy depends on

The mass of the moving body
Both mass and velocity of the moving body
The velocity or speed of the moving body.
The pressure of the moving body

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