Q. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

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Q. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

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Q. Intensity of sound at a point is ____ its distance from the source.

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Q. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

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Q. Radio telescopes are better than optical telescopes because

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Q. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

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Q. Out of the following pairs, which one does not have identical dimension?

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Q. Mercury is commonly used as a thermometric fluid rather than water because

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Q. Optical fibre works on the

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Q. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

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Q. Supersonic plane fly with the speed

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Q. Mach number is used in connection with the speed of

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Q. On a stationary sail boat, air is blown from a fan attached to the boat. The boat

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Q. Rainbow is due to

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Q. Stars which appear single to the naked eye but are double when seen through a telescope are

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Q. ML2T-2 is the dimensional formula for

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Q. Solar eclipse will take place when

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Q. Isotopes of an element contain

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Q. One watt-hour is equivalent to

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Q. Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?

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