Physics
If electric resistance is to be decreased, then the number of resistances should be connected in ________

None of these
Mixed arrangement
Parallel
Series

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Physics
The velocity of sound in air

Increases with decrease of temperature
Decreases with increase of temperature
Decreases with decrease of temperature
Does not depend on temperature

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Physics
Energy in reflected light :

Becomes maximum for angle of incidence equal to 45°
Does not depends on the angle of incidence
Increases with the increase in angle
Decreases with the increase in angle of incidence

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Physics
Specific gravity is defined as the ratio of

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

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