Question # 1

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

The modulus of rigidity of a liquid is

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Zero

1

Infinity

A value not one of those mentioned above

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

For obtaining appreciable extension the wire should be

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Short and thin

Long and thin

Short and tick

Long and thick

How much water a pump of 2kW can raise in one minute to a height of 10 m. take g = 10 m/s²?

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1000 liters

1200 liters

100 liters

2000 liters

Radio waves of constant amplitude can be generated with

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Rectifier

Filter

FET

Oscillator

In which of the following states does the incandescent substance give continuous spectrum?

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Vapours in atomic state

Vapours in molecular state

Solid or fluid in bulk state

Solid or fluid in plasma state

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

What remains constant when the earth revolves around the sun?

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Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

A body moves a distance of 10 m along a straight line under the action of a force of 5 Newtons, if the work done is 25 joules the angle which the force takes with the direction of motion of the body is:

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0°

30°

60°

90°

The nucleus 6C12 absorbs an energetic neutron and emits a beta particle (β) The resulting nucleus is

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₇N¹⁴

₅B¹³

₇N¹³

₆N¹³

A ten-ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts:

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1310 W

670 W

810 W

1210 W

The length of a telescope is 36 cm. The focal lengths of its lenses can be

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30 cm, 6 cm

-30 cm, -6 cm

30 cm, -6cm

-30cm, 6cm

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

Which one of the following phenomena is not explained by Hugen's construction of wavefront?

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Refraction

Reflection

Diffraction

Origin of sepectra

A moving charge will gain energy due to the application of

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Electric field

Magnetic field

Both of these

None of these

How much water a pump of 2kW can raise in one minute to a height of 10 m, take g = 10 m/s²?

Choose an answer

1000 liters

1200 liters

100 liters

2000 liters

When the length of a microscope tube increase, its magnifying power

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Decreases

Increases

Does not Change

May increase or decrease depending on the observer and the place of observation

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 the above

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

According to classical theory the proposed circular path of an electron in Rutherford model of atom will be

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Circular

Straight line

Parabolic

Spiral

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

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