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Physics

Physics
A device used for converting a.c. into d.c. is called

Transformer
Induction coil
Dynamo
Rectifier

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Physics
Least audible sound for most of the human ear is :

0.005 µ bar
5.0 µ bar
0.0002 µ bar
10.0 µ bar

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Physics
A body absorbs heat most if it is

White and smooth
Black and smooth
Black and rough
White and rough

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Physics
What is the fundamental unit of amount of a substance?

Kelvin
Meter
Candela
Mole

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Physics
Which compressor is usually used in AC?

Centrifugal
Reciprocating
Rotary
Axial

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Physics
In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to

10 N
0.1 N
100 N
1 N

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