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Physics

Physics
The instrument which uses sound waves to measure the depth of oceans is

Radar
Sonar
Venturimeter
Altimeter

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Physics
An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

6 units
60 units
0.6 units
600 units

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Physics
Sound travels fastest in

Vacuum
Air
Water
Glass

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Physics
The unit of magnetic permeability is

Henry/meter
Henry
Weber
Weber/meter

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Physics
A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be ________

20 J
50 J
30 J
40 J

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Physics
The absolute zero is a temperature at which ________

Molecular motion in a gas would cease
All gases become solid
All gases become liquid
Water freezes

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