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Physics

Physics
Sources of geothermal power are

None of these
Earth's heat
Water
Both A & B

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Physics
The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be:

1 T
8 T
4 T
2 T

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Physics
If the phase difference between two points is 120° for a wave with velocity of 360 m/s and frequency 500 Hz, then path difference between the two points is

1 cm
12 cm
24 cm
6 cm

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Physics
A nuclear reactor is said to have become 'critical' when

It is ready to produce controlled energy
It starts emitting dangerous radioactive radiations
It stops due to malfunctioning
It is shut down to avoid explosion

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

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

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Physics
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

0.41666666666667
24 A
8.5 A

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