Question # 1

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

The critical temperature of mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

When a platinum wire is heated, it appears orange red at

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500°C

900°C

1100°C

1300°C

Dimensions of velocity are

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[L]

[T]

[LT^-1]

[LT^-2]

Referring to above figure, current in coil P falls from its maximum value to zero

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

The number of vibrations in two seconds can be expressed as______if frequency of vibration is f.

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f

2 f

3 f

1/2 f

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

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220 volt

253 volt

.311 volt

440 volt

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 kg

3 kg

4 kg

8 kg

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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Ve

V/e

e/V

2Ve

A rheostat can e used:

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As variable resistor

As potential divider

For varying the current

All of these

None of these

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

Which of the following is not an example of adiabatic process

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the rapid escape of air from a burst type

the rapid expansion and compression of air through which a sound wave is passing

cloud formation in the atmosphere

none of them

Improper biasing of a transistor circuit produces

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Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

Light year is a unit of:

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Time

Distance

Velocity

Intensity of light

The field around a moving charge is called

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magnetic field

conservative field

non-conservative field

none of these

A body moves a distance of 10 m among a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which the force makes with the direction of motion of a body is:

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0°

30°

60°

90°

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

When brakes are applied to a fast moving car, the passenger will be thrown:

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Forward

Backward

Downward

none of these

Example of vibratory motion is

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mass suspended from a spring

a bob of simple pendulum

mass attached to a spring placed

all of them

If two bodies of equal masses moving in the same direction collide elastically, then their velocities.

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Are added

Are subtracted

Do not change

Are exchanged

The space around the earth within it exerts a force of attraction on other bodies of known as:

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Nuclear field

Conservative field

Electric field

Gravitational field

By CAT scans, we can detect the density difference of the order of:

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1%

20%

30%

50%

70%

Amorphous solids:

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Have definite melting points

Are called glassy solids

Have no definite melting point

Both (B) and (C)

Both (A) and (C)

Conventionally the angular velocity is directed at an angle of

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of the above

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

Density is defined as:

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Mass per volume

Volume per mass

Mass X volume

Mass per length

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

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positive temperature

negative temperature

absolute temperature

zero temperature

The work done by the system on its environment is considered as

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positive

negative

zero

any one of them

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