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Physics

Physics
The speed of sound travel fastest through

None of these
Gas
Liquid
Solid

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Physics
Which of the following is not caused by atmospheric refraction of light ?

Sun appearing higher in the sky than it actually is
Twinkling of stars at night
Sun becoming visible two or three minutes before actual sunrise
Sun appearing red at sunset

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Physics
The pressure exerted by a 760 mm column of mercury at 0°C is known as

1 poise
1 atmosphere
1 bar
1 pascal

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Physics
Convex mirrors are used as a rear view mirror in motor cycles because

It forms smaller image as compared with object
All of these
It forms erect (upright) image
It forms real image

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Physics
The washing machine works on the principle of

Reverse osmosis
Diffusion
Dialysis
Centrifugation

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Physics
Mud houses are cooler in summers and warmer in winters as compared to brick houses because

Evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Mud is a bad conductor
Mud is a poor insulator
Mud is a good conductor

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