Physics
A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.

0.042361111111111
Cannot be found from the given information.
0.044444444444444
0.043055555555556

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Physics
Holography is a technique of

Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional black and white photograph
Recording a permanent three dimensional multicolour photograph

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Physics
RADAR is used for:

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

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Physics
Superconductors are substances which

conduct electricity at high temperatures
offer no resistance to the flow of electricity
offer high resistance to the flow of current
conduct electricity at low temperature

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Physics
Which of the following events occurred first ?

Marconi first tranmitted a wireless signal
Madame Marie Curie became the first woman Nobel Prize winner
Max Planck unveiled the Quantum Theory
Albert Einstein propounded the General Theory of Relativity

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