Physics
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

> P
< P
2P
P

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Physics
RADAR is used for:

detecting and locating the position of objects such as Aeroplanes.
locating geostationary satellites.
receiving a signals in a radio receiver.
locating submerged submarines.

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Physics
A Fuse wire is characterised by

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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