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PHYSICS

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

visible light
X-rays
ultraviolet light
radio waves

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

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

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

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

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Physics
Optical fibre works on the

scattering
principle of refraction
interference
total internal reflection

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

42 seconds
42 years
4.2 years
4.2 seconds

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