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Physics

Physics
The SI unit for measuring work and energy is

Joule
Farad
Watt
Ohm

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Physics
Radio waves sent out by a radio stations are reflected by

Ionosphere
Mesosphere
Troposphere
Stratosphere

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Physics
A single fixed pulley is used to draw water from a well because

Efficiency is 100%
Velocity ratio is low
Mechanical advantage is high
Force is applied in a convenient direction

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Physics
A body falling through a liquid acquires a steady velocity is known as

Terminal velocity
Steady state velocity
End velocity
Touch down velocity

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Physics
What is the reason for twinkling of stars ?

Atmospheric refraction
Atmospheric reflection
Dispersion of light
Total internal reflection

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Physics
A bird sitting on a high tension electric wire does not get electrocuted because

Its feet are good insulators
The body is earthed
It has high resistance
It does not form a closed path for the flow of current

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