Question # 1

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

The peak voltage in a 200 volt A.C supply is nearly

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220

253

311

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized

A bullet is short from a rifle. As a result the rifle recoils, The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?

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12

6

3

2

The part of a transistor which is heavily doped to produce large number of majority carriers is

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Emitter

Base

Collector

Any of the above depending on nature of transistor.

What remains constant when the earth revolves around the sun?

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Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

Both transverse and longitudinal

When boron is added as an impurity to silicon the resulting material is

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

The average power dissipation in a pure capacitor in AC circuit is

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1/2 CV²

CV²

2CV²

Zero

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

The half-life of a radio-isotope is 5 years. The fraction of atoms decayed in this substance after 15 years will be

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1

3/4

7/8

5/8

For obtaining appreciable extension, the wire should be

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Short and thin

Long and thin

Short and thick

Long and thick

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

In a common base transistor circuit, the current gain is 0.98. On changing the emitter current by 5.00 mA, the change in collector current is

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0.916 mA

2.45 mA

4.9 mA

5.1 mA

The angle between rectangular components of a vector is

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0°

60°

90°

120°

To make the frequency double of an oscillator, we have to

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Double the mass

Half the mass

Quadruple the mass

Reduce the mass to one fourth

When boron is added as an impurity to silicon, the resulting material is.

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

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°

When we apply reverse bias to a junction diode, it

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Lowers the potential barrier

Raise the potential barrier

Increase the majority carrier current

Increase the minority carrier current

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both A and B

None of these

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