Question # 1

Copper and germanium are cooled to 70 K from room temperature then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

A wire is stretched to double of its length.The strain is

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2

1

Zero

0.5

A man pushes a wall but fails to displace it. He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by monochromatic blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

The fringe width will remain unchanged

Fringes will become less intense

When we apply reverse bias to a junction diode it

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Lowers the potential barrier

Raises the potential barrier

Increase the majority carrier current

Decrease the majority carrier current

A body of mass 2 kg is thrown up vertically with K.E of 490 joules If the acceleration due to gravity is 9.8 m/s² the height at which the K.E of the body becomes half its original value is give by:

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50 m

12.5 m

25 m

10 m

How does the Young's modulus vary with the increase of temperature?

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Decrease

Increase

Remains constant

First increases and then decreases

A particle moves along a circular path under the action of a force. The work done by the force is

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Zero

Positive and non-zero

Negative and non zero

None of above

Two forces are acting together on an object. The magnitude of their resultant is minimum when the angle between the force is.

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0°

60°

120°

180°

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

A charge Q is divided into two parts q and Q - q and separated by a distance R. the force of repulsion between them will be maximum when:

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q = Q/4

q = Q/2

q = Q

None of these

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