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Q. X-rays are
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Q. Waves that are required for long distance wireless communication are
Q. Danger signals are generally red as red light
Q. In barometer mercury is preferred over water because
Q. When a detergent is added to pure water, its surface tension
Q. The ratio of the total distance travelled by a body to the total time taken by it is its
Q. If a sound travels from air to water, the quantity that remain unchanged is
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