Q. Natural radioactivity was discovered by

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Q. Planets are

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Q. One nanometer is equal to

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Q. Mica is used in electrical appliances such as electric iron because mica is

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Q. It is easier to roll a barrel full of coal tar than to pull it because

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Q. Minimum number of unequal vectors which can give zero resultant are

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Q. Intensity of sound has

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Q. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from

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Q. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

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Q. Atomic bomb was first successfully developed by

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Q. Atomic bomb was successfully developed in

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Q. Atomic theory was developed by John Dalton in

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Q. John Dalton developed the 'Atomic Theory' in

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Q. Charles Goodyear invented the vulcanized rubber in

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Q. Who invented vulcanized rubber?

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Q. Cathode Ray Tube which used cold cathode diode was invented by

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Q. Earliest version of Cathode Ray Tube was invented in

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Q. Scientists who have provided basis for inventing Circuit Breaker are

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Q. Who invented circuit breaker with inspiration from the work of Faraday and Henry is

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Q. First electric 'DC' motor was invented by

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