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Physics

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

Rubber
Mica
Asbestos
Celluloid

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Physics
If electric resistance is to be decreased, then the number of resistances should be connected in ________

Series
None of these
Parallel
Mixed arrangement

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Physics
One Kilowatt hour is equal to -

3.2 Mega Joule
3.6 Mega Joule
3.8 Mega Joule
4.0 Mega Joule

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Physics
A copper disc has a hole. If the disc is heated, the size of the hole

Increases
No change
Decreases
First increases and than decreases

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Physics
Sound of frequency below 20 Hz is called

infrasonic
supersonics
audio sounds
ultrasonic

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Physics
A photostat machine works on

Magnetic image making
Electrostatic image making
Electromagnetic image making
Thermal image making

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