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PHYSICS

Physics
Which of these is not a simple machine?

A ramp
A pair of scissors
The pulley
A lever

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Physics
The plastic material commonly used for making gear wheels is

Polystyrene
Bakelit
Nylons
Polyesters

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Physics
The reason for a swimming pool to appear less deep than the actual depth is

Interference
Reflection
Light scattering
Refraction

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Physics
When light passes from one medium to another, this phenomenon of change in its direction is called ________

Refraction
Propagation
No option is correct
Diffraction

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

Refraction
Reflection
Diffraction
Total internal reflection

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