Question # 1

A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton's. 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°

A photoelectric cell coverts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

In case of p-n junction diode, at high value of reverse bias, the current rises sharply. The value of reverse bias is known as:

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Cut off voltage

Zener voltage

Inverse voltage

Critical voltage

A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

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 is increased

The length of the pendulum is decreased

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

An ideal choked (used along with fluorescent tube) would be

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A pure resistor

A pure capacitor

A pure inductor

A combination of an inductor and a capacitor

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

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

When light wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however, light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters?

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1 : 2

2 : 1

4 : 1

1 : 4

A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen

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Half the image will disappear

No change either in size or in intensity

Intensity of image will increase

Intensity of the image will decrease

A cable that can support a load W is cut into two equal parts. The maximum load that can be supported by either part is:

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W/4

W/2

W

2W

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

As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1, the kinetic energy K and potential energy U change as

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K two fold, U also two fold

K four fold, U also four fold

K four fold, U two fold

K two fold, U four fold

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

The dimensional formula of torque is:

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[ML²T^-2]

{MLT^-2]

[ML^-1T^-2]

[ML^-2T^-2]

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