Physics
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

Zero
Same as the weight of the man
Greater than the weight of the man
Less than the weight of the man

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Physics
A standing wave occurs when

Two waves overlap
The speed of the wave is zero or near zero
The amplitude of a wave exceeds its wavelength
A wave reflects upon itself

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Physics
Specific gravity is defined as the ratio of

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

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