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Physics

Physics
The atmospheric layer reflecting radio waves is called

Mesosphere
Ozonosphere
Ionosphere
Stratosphere

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Physics
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?

All water will become ice
All ice will melt
No change will happen
Only some ice will melt

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Physics
Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.

Shining white
Rough black
Rough white
Shining black

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Physics
The angle in which a cricket ball should be hit to travel maximum horizontal distance is :

45° with horizontal
30° with horizontal
60° with horizontal
15° with horizontal

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Physics
What is the name of the device used to convert alternating current into direct current ?

Transformer
Galvanometer
Ammeter
Rectifier

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Physics
The Laser is a beam of radiations which are

Coherent and non-monochromatic
Coherent and monochromatic
Non-coherent and monochromatic
Non-coherent and non-monochromatic

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