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The cloud float in the atmosphere because of their low
Correct Answer Is : Temperature The change of a solid into vapour directly is called Correct Answer Is : Sublimation The audible frequency range of a human ear is Correct Answer Is : 20 Hz to 20000 Hz The wavelength of X-rays is of the order of Correct Answer Is : 1 angstrom Who discovered wireless communication ? Correct Answer Is : Marconi Q.Which instrument is used for the measurement of angular distances between two objects? Correct Answer Is : Sexant The Outer part of a Railway track near the bend or a curve is generally raised Correct Answer Is : To produce the necessary centripetal force Q.What are Sunspots? Correct Answer Is : These are cooler areas which move about on the sun`s surface and show up as dark spots. The number of images of an object formed by two mirrors inclined at an angle of 60° is Correct Answer Is : 5 What is the technology used in a compact disc? Correct Answer Is : Laser