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

Clinical Thermometer
Anemometer
Sling Psychrometer
Kata Thermometer

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Physics
Planets are

luminous heavenly bodies revolving around a star
luminous heavenly bodies that do not twinkle
non-luminous heavenly bodies
luminous heavenly bodies that twinkle

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is lesser than the density of river water
The sea is-deeper than the river
The sea is wider than the river
The density of sea water is more than the density of river water

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