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Blue colour of sea water is due to
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A bar magnet is equivalent to _______.
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How many times more intense is a 60 dB sound than a 30 dB sound?
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Hydrogen atom does not emit X-rays because
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If an electron and a proton have the same de-Broglie wavelength, then the kinetic energy of the electron is
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In an unbiased p-n junction
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Maximum diffraction takes place in a given slit for
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Pick out the correct statement from the following :
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Pick out the statement which is NOT correct.
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Solar spectrum is an example for
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The most stable particle in Baryon group is
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The spectrum of an oil flame is an example for _____.
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A convex and a concave lens seperated by distance d are then put in contact. The focal length of the combination
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A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will
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A convex lens of focal length 30 cm produces 5 times magnified real image of an object. What is the object distance?
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According to Einstein's photoelectric equation, the graph of K.E. of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope ______.
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An astronaut on a strange planet finds that acceleration due to gravity is twice as that on the surface of Earth. Which of the following could explain this?
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Electromagnetic wave consists of periodically oscillating electric and magnetic vectors ______.
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For a series LCR circuit at resonance, the statement which is not true is
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Hot water cools from 60°C to 50°C in the first 10 minutes and to 42°C in the next 10 minutes. Then the temperature of the surroundings is _____.

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