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Physics

Physics
The distance between node and adjacent antinode is 30 cm. The wavelength is

90 cm.
120 cm.
60 cm.
30 cm.

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Physics
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A horizontal straight line
A circle
A vertical straight line
A parabola

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Physics
Noise is measured in

Watt
REM
Decibel
Centigrade

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Physics
If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to ________.

3 m
300 m
30 m
0.3 m

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Physics
An atom bomb based upon the principal of ________

Nuclear fission
Controlled chain reaction
Nuclear fussion
None of these

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Physics
Magnetism in materials is due to

Circular motion of electrons
All neutrons at rest
Electrons at rest
Protons at rest

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