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Physics

Physics
The focal length of a concave mirror with a radius of curvature of 20.0 cm is :

15 cm
10 cm
20 cm
5 cm

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Physics
The ordinary and maximum tolerance limit of sound by human being is

60 db to 80 db (decibel)
50 db to 70 db (decibel)
70 db to 85 db (decibel)
65 db to 75 db (decibel)

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Physics
If the diameter of a capillary is doubled, then the rise of water in it will be

Four times
Half
No change
Two times

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Physics
What are the particles emitted by radioactive element after 3 consecutive disintegration?

1 alpha 1 beta
2 beta 1 alpha
2 beta 2 alpha
2 alpha 1 beta

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Physics
When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler.

Law of conservation of energy
Law of Inertia
Newton's third law of motion
Law of conservation of momentum

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Physics
Minimum number of unequal vectors which can give zero resultant are

three
more than four
two
four

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