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Physics

Physics
A wheel-barrow is an example of

Class III lever
Pulley system
Class II lever
Class I lever

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Physics
What part of the atom has a positive charge?

Neutron
Electron
All listed here
Proton

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Physics
Fish and other aquatic creatures can live inside a deep frozen pond because

They can adapt themselves to live in ice
Ice is a bad conductor of heat
There will always be water just beneath the ice level
Fish are cold-blooded animals

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Physics
Angle of friction and angle of repose are

Equal to each other
Not equal to each other
Proportional to each other
None of these

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Physics
According to the theory of relativity, which of the following always remains constant ?

Space
Length of an object
Time
Velocity of light

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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 ________

50 J
30 J
40 J
20 J

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