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Physics

Physics
Coolis tube is used to produce

Radio waves
Micro waves
Gama rays
X-rays

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Physics
Large astronomical telescopes always use as objective

lens
None of these
combinations of lenses
mirror

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Physics
The oil in the wick of an oil lamp rises up due to:

Gravitational force
Low viscosity of oil
Capillary action
Pressure difference

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Physics
Radio telescopes are better than optical telescopes because

they can work even in cloudy conditions
All of these
they can detect faint galaxies which no optical telescope can
they can work during the day and night

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Physics
If a band is played on the moon the sound will

Be heard upto 10km from it
Be heard by us faintly
Not be heard at any distance at all from it
Reverberate

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Physics
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

3.33 km
1200 m
0.33 km
33 km

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