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Physics

Physics
The distance between node and adjacent antinode is 30 cm. The wavelength is

120 cm.
90 cm.
30 cm.
60 cm.

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Physics
A colour-blind person cannot

Have persistence of vision
See black colour
See distant objects
Distinguish between certain colours

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Physics
The unit of noise pollution (level) is :

Decibel
Decimal
None of these
Ppm

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Physics
Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from

northeast
west
southeast
east

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Physics
Heat transfer by conduction occurs when molecules

Collide
Heated
Combine
None of these

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Physics
Which one among the following is not an electromagnetic wave?

X-Ray
Infrared Ray
Cathode Ray
R-Ray

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