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Physics

Physics
Shaving mirror is

Concave
Parabolic
Plane
Convex

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Physics
In a Laser (say neon laser) all the atoms emit the light waves of

Same frequency
Same phase
Same amplitude
All of these

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Physics
Positive feedback is used in

None of these
Rectifiers
Amplifiers
Oscillators

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Physics
A decibel is

A musical note
A measure of sound level
A musical instrument
The wavelength of noise

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Physics
If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?

LUV > lVIS > lIR
LUV < lVIS < lIR
LUV < lIR < lVIS
LUV > lIR > lVIS

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Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

3R/4
2R
5R/4
R/2

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