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Physics

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

Cathode Ray
Infrared Ray
X-Ray
R-Ray

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Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The bell jar breaks up
The mercury level starts falling
The mercury level does not change
The mercury level starts rising

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Physics
A 4 kg object is moving horizontally with a speed of 5 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:

100 J
50 J
75 J
150 J

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Physics
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

> P
2P
< P
P

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Physics
Wind and solar energy are examples of

Limited
Unsustainable
Renewable
Non renewable

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Physics
Transformer is a device to convert

Mechanical energy into Electrical energy
Low voltage D.C. into high voltage D.C.
Low voltage A.C. into high voltage A.C.
C. to A.C.

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