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PHYSICS

Physics
Which of these is not a simple machine?

A lever
A ramp
The pulley
A pair of scissors

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Physics
The plastic material commonly used for making gear wheels is

Polyesters
Bakelit
Nylons
Polystyrene

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

Interference
Refraction
Light scattering
Reflection

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

No option is correct
Diffraction
Propagation
Refraction

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

Refraction
Total internal reflection
Reflection
Diffraction

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