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Physics

Physics
When a body is immersed in a liquid, the force acting on it is

Both (A) and (B)
Mass
Weight
Upthrust

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Physics
Optical fibre works on which of the following principle of light?

Diffraction
Refraction
Reflection
Total internal reflection

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Physics
An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is

25 J
20 J
40 J
10 J

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Physics
Bolometer is used to measure

Wavelength
Velocity
Temperature
Frequency

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Physics
When a ring of metal is heated what happens to its hole ?

Contracts
Expands
It expands or contracts according to its diameter
It expands or contracts according to its coefficient of expansion

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

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

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