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Physics

Physics
Among the following materials sound travels fastest in

Vacuum
Air
Water
Steel

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Physics
An electron and a proton starting from rest get accelerated through potential difference of 100 kV. The final speed of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?

Cannot be determined
Ve = Vp
Ve < Vp
Ve > Vp

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Physics
Which metal is the best conductor of heat?

Silver
All of these
Gold
Copper

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Physics
Flywheel is an important part of a steam engine because it :

Helps the engine in keeping the speed uniform
Accelerates the speed of the engine
Decreases the moment of inertia
Gives strength to the engine

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Physics
When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :

Reflection
Damped vibrations
Refraction
Forced vibrations

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Physics
When two semiconductors of pand n-type are brought in contact, they form p-n junction which acts like a/an

Conductor
Amplifier
Rectifier
Oscillator

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