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Physics

Physics
A person does some work of 1,000 J in 2 s. His power will be ________

50W
1000W
500W
25W

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Physics
A small gap is left at the joints of rails in a railway track to

Avoid the tracks being distorted due to seasonal temperature variation
Control the speed of train
Keep the rails equidistant
Avoid the heating of tracks to high temperature

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Physics
A good conductor while carrying current is

Positively charged
Negatively charged
Alternately charged positive and negative
Electrically neutral

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Physics
Light scattering takes place in

Electrolyte solutions
Acidic solutions
Basic solutions
Colloidal solutions

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Physics
A soap bubble shows colours when illuminated with white light. This is due to

Interference
Reflection
Polarisation
Diffraction

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Physics
Ozone layer above the surface of Earth provides a shield against

Infra-red rays
Ultra-violet rays
Gamma rays
X-rays

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