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PHYSICS

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

X-rays
radio waves
visible light
ultraviolet light

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

Moment of inertia and moment of a force
Work and Torque
Impulse and Momentum
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
specific heat of mercury is more than water
specific heat of mercury is less than water
density of mercury is more than the water

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Physics
Optical fibre works on the

scattering
total internal reflection
principle of refraction
interference

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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 years
42 seconds
4.2 years

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