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Physics

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

Anemometer
Hygrometer
Hydrometer
Psycho Meter

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Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

3R/4
5R/4
2R
R/2

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Physics
What is the reason for twinkling of stars ?

Total internal reflection
Dispersion of light
Atmospheric refraction
Atmospheric reflection

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Physics
The instrument for measuring intensity of earthquakes is called

Ediograph
Ergograph
Pantagraph
Seismograph

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Physics
The point where total mass of a body is supposed to be concentrated is known as

Centre of mass
Centre of gravity
Centre of motion
Dead centre

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Physics
When light passes from one medium to another, this phenomenon of change in its direction is called ________

No option is correct
Refraction
Diffraction
Propagation

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