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Physics

Physics
Decibel is a term connected with :

Air
Water
Soil
Sound

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Physics
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly

Produce heat and radiate it toward earth
Prevent cold waves from the sky descending on earth
Absorb heat from the atmosphere send it towards earth
Reflect back the heat given by earth

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Physics
Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?

-4.33 diopters
4.33 diopters
12.33 diopters
-12.33 diopters

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Physics
Which waves cannot be transmitted through vacuum?

Heat
Sound
Electromagnetic
Light

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Physics
The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

1 MeV
10 MeV
0.1 MeV
100 MeV

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Physics
When a barometer is rising air pressure is

Constant
Increasing
Decreasing
Zero

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