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Physics

Physics
The substance which conducts current in the solid state is

Sodium chloride
Graphite
Iodine
Diamond

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Physics
Which of the following has the shortest wavelength?

Radio waves
Infrared rays
Gamma rays
Microwaves

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Physics
What type of lens is used in a magnifying glass

None of these
Convex
Plano-concave
Concave

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Physics
Which results in an increase in power?

Doing less work in more time.
Doing more work in less time.
Doing more work in more time.
Doing less work in less time.

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Physics
Which of the following is a good conductor of heat but a bad conductor of electricity ?

Celluloid
Asbestos
Rubber
Mica

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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:

2 T
8 T
4 T
1 T

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