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Physics

Physics
Sound cannot pass through

Water
Vacuum
Air
Steel

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Physics
Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre?

-3.75 diopters
11.25 diopters
-11.25 diopters
3.75 diopters

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Physics
Person who is colourblind cannot distinguish between

Black and yellow
Yellow and white
Green and blue
Red and green

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Physics
A body absorbs heat most if it is

Black and rough
Black and smooth
White and smooth
White and rough

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Physics
The mercury and sodium street lamps light up because of :

Atomic absorption
Electron emission
Electron absorption
Atomic emission

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Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

4 R/5
R/5
5 R
5 R/4

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