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Prelims

UPSC Prelims Questions

Practice UPSC Prelims MCQs by subject and year. Free questions with explanations for focused revision.

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Q.14419·Miscellaneous·2011·Easy

‘The stars seem to be higher on the sky than they actually are’. This can be explained by:

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Q.14420·Miscellaneous·2011·Easy

A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a:

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Q.14421·Miscellaneous·2011·Easy

If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called:

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Q.14422·Miscellaneous·2011·Easy

The surface temperature of the Sun is nearly:

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Q.14423·Miscellaneous·2011·Easy

A Jet engine works on the principle of conservation of:

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Q.14424·Miscellaneous·2011·Easy

The lines of force of a uniform magnetic field:

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Q.14425·Miscellaneous·2011·Easy

Light travels slower in glass than in air because:

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Q.14426·Miscellaneous·2011·Easy

Suppose you are standing 1 m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it?

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Q.14427·Miscellaneous·2011·Easy

The material used for electric fuse is an alloy of tin and lead. This alloy should have:

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Q.14428·Miscellaneous·2011·Easy

When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by:

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Q.14429·Miscellaneous·2011·Easy

Bats can ascertain distances, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted:

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Q.14430·Miscellaneous·2011·Easy

Which one among the following is the major cause of blurring and unsharp images of objects observed through very large telescope at the extreme limit of magnification?

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Q.14431·Miscellaneous·2011·Easy

A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton’s:

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Q.14432·Miscellaneous·2011·Easy

Light travels in optical fibre irrespective of its shape because it is a device by which signals can be transferred from one location to another. It is based on the phenomenon of:

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Q.14433·Miscellaneous·2011·Easy

Which one among the following statements is correct?

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Q.14434·Miscellaneous·2011·Easy

A jet plane flies through air with a velocity of 2 Mach. While the velocity of sound is 332 m/s the air speed of the plane is:

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Q.14435·Miscellaneous·2011·Easy

A body initially at rest is acted upon by a constant force. The rate of change of its kinetic energy varies:

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Q.14436·Miscellaneous·2011·Easy

Which one among the following statements is not correct?

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