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Physics

Physics
The atmospheric layer reflecting radio waves is called

Mesosphere
Ozonosphere
Stratosphere
Ionosphere

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

Velocity of light
Length of an object
Space
Time

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Physics
The ''four stroke petrol engine' is based on

Carnot-cycle
Otto-cycle
Boyle's-cycle
Diesel-cycle

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Physics
Clouds float in the atmosphere because of their

Low pressure
Low temperature
Low density
Low viscosity

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Physics
When light passes from one medium to another, this phenomenon of change in its direction is called ________

Diffraction
Propagation
No option is correct
Refraction

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Physics
The width of depletion layer of a P-N junction

Increases with heavy doping
Is independent of applied voltage
Is increased under reverse bias
Decreases with light doping

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