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PHYSICS

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

ultraviolet light
radio waves
X-rays
visible light

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

Work and Torque
Impulse and Momentum
Moment of inertia and moment of a force
Angular momentum and Planck's constant

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

mercury has greater visibility than water
density of mercury is more than the water
specific heat of mercury is more than water
specific heat of mercury is less than water

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Physics
Optical fibre works on the

total internal reflection
interference
scattering
principle of refraction

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

4.2 seconds
42 seconds
4.2 years
42 years

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