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Physics

Physics
Instrument used to study the behaviour of a vibrating string is :

Hydrometer
Hygrometer
Barometer
Sonometer

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Physics
Why does a cannon recoil after firing ?

Conservation of energy
Newton's first law of motion
Backward thrust of gases produced
Newton's third law of motion

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Physics
Vehicle tyres are inflated properly

To allow the vehicle to take more load.
To go fast and save fuel.
To ensure smooth running.
To avoid skidding and to minimise friction

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Physics
Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.

Visible, infrared, microwave, X-rays
X -rays, visible, infrared, microwave
X - rays, infrared, visible, microwave
Microwave, infrared, visible. X-rays

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Physics
The threshold frequency is the frequency below which :

Photo electric emission is not possible
Photo current decreases with voltage
Photo current is constant
Photo current increases with voltage

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Physics
The instrument that measures and records the relative humidity of air is

Hydrometer
Barometer
Hygrometer
Lactometer

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