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Physics

Physics
The electric current in a metal wire is due to the flow of -

Electrons
Holes
Protons
Ions

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Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going up with uniform speed
The lift is going down with an acceleration
The lift is going down with uniform speed
The lift is going up with an acceleration

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Physics
Electrical burns occur principally because of

Radiation pulses of the electricity
The high energy of electrons
All of these
The heat generated by the flow of electrical current through the body

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Physics
The force that keeps a body in a circular motion called

All listed here
The frictional force
The centrifugual force
The centripetal force

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Physics
On the Kelvin scale, the melting point of ice is

0 K
373K
100K
273K

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Physics
The quality or tone of a musical sound produced by a stringed instrument depends on

Amplitude of vibration
Wave form of the sound
Length of the strings in the instrument
Frequency of vibration

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