Physics
A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of

30 m/s
25 m/s
36 m/s
18 m/s

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short waves are unaffected by atmospheric disturbances.
Short waves are more energetic than long waves.
Short wave broadcasts are made by nearby radio stations.

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Physics
A Fuse wire is characterised by

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

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