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Physics

Physics
Which one among the following is not an electromagnetic wave?

R-Ray
X-Ray
Infrared Ray
Cathode Ray

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Physics
Who enunciated the laws of planetary motion?

Nicolaus Copernicus
Isaac Newton
Johannes Kepler
Galileo

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Physics
Lakes freeze in cold countries in winter, leaving the water underneath at

0°F
4°F
0°C
4°C

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Physics
Rectifiers are used to convert:

Direct current to Alternating current
High voltage to low voltage
Alternating current to Direct current
Low voltage to high voltage

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Physics
The energy stored in a watch spring is

Potential energy
Heat energy
Chemical energy
Kinetic energy

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Physics
Water is used in car radiator because of its

Easy availability
Low density
Low boiling point
High specific heat capacity

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