Q. If a plane glass slab is placed on the letters of different colors, then

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A

all the letters appear to be raised up to the same height

B

violet colored letters appear to be more raised up

C

Red colored letters appear to be more raised up

D

none of these

Solution:

Red colored letters appear to be raised more.

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4. 6. An ideal heat engine gives out heat at to have a of efficiency. The temperature of the source is

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