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Physics

Physics
For a freely falling body, the sum of kinetic energy and potential energy is always

Zero
Variable
Unity
Same

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Physics
Light from Sun reaches Earth in approximately

12 minutes
3 minutes
8 minutes
10 minutes

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Physics
Sound is heard over longer distances on rainy days because

Moist air does not absorb sound
Sound travels faster in moist air
Sound travels slowly in moist air
Moist air absorbs sound

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Physics
Visible light has a higher frequency than

All listed here
X rays
Ultra violet
Radio waves

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Physics
Which one of the following determines the sharpness of image in a camera ?

The focal length of the lens
Size of the camera
The exposure time
The aperture

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Physics
Stars appear twinkling because of ......... of light.

Scattering
Emission
Reflection
Absorption

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