Physics
Ozone layer above the surface of Earth provides a shield against

X-rays
Ultra-violet rays
Infra-red rays
Gamma rays

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Physics
The nature of fuse wire is

High resistance and low melting point.
Low resistance and low melting point.
High resistance and high melting point.
Low resistance and high melting point.

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Physics
The wall of a dam is broader at the base

To withstand pressure that is increased with atmospheric pressure
Because streamlining is required
To withstand pressure that increases in a horizontal plane
To withstand pressure that increases with depth

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