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Physics

Physics
An object which absorbs all colours and reflects none appears:

Blue
Black
Grey
White

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Physics
If electric resistance is to be decreased, then the number of resistances should be connected in ________

None of these
Series
Parallel
Mixed arrangement

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Physics
What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?

Remains constant
Becomes zero
None of these
Increases exponentially

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Physics
It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

Needle exerts more pressure than nail on the balloon.
Nail exerts more pressure than needle on the balloon.
Gas is reactive with the needle.
Nail is more longer than needle.

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Physics
The quality or tone of a musical sound produced by a stringed instrument depends on

Amplitude of vibration
Length of the strings in the instrument
Frequency of vibration
Wave form of the sound

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Physics
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.

Diffraction
Reflection
Total internal reflection
Refraction

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