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Physics

Physics
Lens is made up of which glass

Pyrex glass
Cobalt glass
Flint glass
Ordinary glass

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Physics
The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because

There is no air or any other gas in the bell jar
The ringing is not loud enough
The bell jar is too small
The glass of the bell jar absorbs the sound waves

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Physics
A doppler effect occurs when a source of sound moves

Away from you
None of these
Towards you
Both A & B

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Physics
The SI unit of resistance is:

Ohm
Joule
Coulomb
Newton

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Physics
The dimensional formula for universal gravitational constant is

M–1L3T–2
M 1L3T2
M–2
ML2T–2

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Physics
Gamma rays are emitions that have

Neither mass nor charge
Charge but no mass
Mass but no charge
Both mass and charge

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