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Which of the following phenomena is responsible for making a rainbow?

Refraction
Internal reflection
Bath A & B
None of the above


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Radiocarbon dating technique is used to estimate the age of

Rocks
Soil
Monuments
None of the above


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Light year is a unit to measure

Length
Distance
Depth
Width


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Light from sun reaches us in approx

2 minutes
4 minutes
6 minutes
8 minutes


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What happens to water when we replace a thin capillary tube with another tube of insufficient length?

will not rise
Change its meniscus
will overflow
depressed


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On a rainy day, small oil films show brilliant colours due to

polarization
interference
diffraction
dispersion


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Some inpurities are added to a semiconductor in order to

increase its resistivity
enable it to withstand higher voltages
increase its electrical conductivity
increase its life


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Which of the below is known as ''deers thirst'' in sanskrit?

mirage
halo
earthshine
rainbow


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Intensity of sound at a point is ____ its distance from the source.

inversely proportional to
directly proportional to square of
inversely proportional to square of
directly proportional to


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When the air is blown from a fan attached to the boat, the boat

moves in same direction
spins around
does not move
moves in opposite direction


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