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Physics

Physics
Which of the following liquids is most viscous?

Oil
Water
Milk
Petrol

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Physics
Which of the metals has the maximum thermal conductivity?

Copper
Silver
Aluminium
Iron

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Physics
The strength of an electromagnet can be increased by

All of these
Increasing the number of turns
Increasing the length of the coiled wire
Increasing current supply

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Physics
Why do birds not have respiratory trouble at the time of flying at high altitude ?

Their lungs are very large
They have extra air sacs
They use less oxygen
They fly inactively

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Physics
A periscope works on the principle of

Refraction
Reflection
Total internal reflection
Diffraction

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Physics
The impurity atoms with which silicon should be doped to make p-type semiconductors are

Boron
Phosphorus
Antimony
Germanium

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