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Physics

Physics
Centrifugal force increases with

Acceleration
Pressure
Temperature
Humidity

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Physics
The time period of a pendulum when taken to the Moon would:

Remain the same
Become zero
Increase
Decrease

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Physics
Water is not suitable as a calorimetric substance because it :

Low latent heat of vapourization
Has high boiling point
Has high specific heat
Is a good conductor

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Physics
Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by

Ammonia
Ozone
Chlorine
Carbon dioxide

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Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

5 R/4
5 R
4 R/5
R/5

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Physics
A bird sitting on a high tension electric wire does not get electrocuted because

The body is earthed
It has high resistance
It does not form a closed path for the flow of current
Its feet are good insulators

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