Q. Radio waves sent out by a radio stations are reflected by
This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.
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Q. A person feels cold after a deep in sea water because
Q. For Gamma radiation, what stops its penetrating abilities?
Q. Out of the following, which is not emitted by radioactive substance?
Q. Which among the following denotes the correct usage of an instrument called ―Theodolite‖?
Q. Nuclear fission is caused by the impact of
Q. In superconductors, the energy gap is due to
Q. The apparatus used to measure the intensity of light is known as
Q. An optically plane surface reflects a beam of light
Q. Addition of suitable impurities into semiconductor, is called
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