Question # 1

The modulus of rigidity of a liquid is

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Zero

1

Infinity

A value not one of those mentioned above

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.

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

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

When the displacement is half of the amplitude the ratio of potential energy to the total energy is

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1/2

1/4

1

1/8

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

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

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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0.196 mA

2.45 mA

4.9 mA

5.1 mA

A pendulum clock set to give correct time in Karachi is taken to Quetta it would give correct time if

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The mass of the pendulum is increased

The mass of the pendulum is decreased

The length of the pendulum os increased

The length of the pendulum is decreased

Which of the following is the only vector quantity

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Temperature

Energy

Power

Momentum

A 50-volt battery is connected across 10-ohm resistor.The current is 4.5 A.The internal resistance of the battery is

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Zero

0.5 Ω

1.1 Ω

5.0 Ω

The modulus of rigidity of a liquid is

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Zero

1

Infinity

A value not one of those mentioned above

The twinkling of stars is due to

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The fact that stars do not emit light continuously

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of these

The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an a.c. supply of 20 V, 50 Hz. The secondary will have an output of

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200V, 50 Hz

2V, 50 Hz

200V, 500 Hz

2V, 5 Hz

A sun rise or sun set, the sun looks reddish because:

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

The peak voltage in 220 volt A.C. supply is nearly

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220 volt

253 volt

311 volt

440 volt

Angular momentum is

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Vector (axial)

Vector (polar)

Scalar

None of these

If the earth were to rotate faster, than its present speed the weight of an object will

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Increase at the equator but remain unchanged at the poles

Decrease at the equator but remain unchanged at the poles

Remain unchanged at the decrease but decrease at the poles

Remain unchanged at the equator but increase at the poles

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

The number of turns in the primary coil of a transformer is 200 and the number of turns in the secondary coil is 10. If 240 volts ac are applied to the primary, the output the secondary will be

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48A

24V

12V

6V

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁=2R₂

R₂=2R₁

R₂=4R₁

R₁=4R₂

The sieman is the SI unit of

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Resistance

Specific Resistance

Conductance

Inductance

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