Question # 1

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h. His average speed will be:

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40 km/h

48 km/h

50 km/h

60 km/h

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

The distance between node and anti-node is

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λ

λ/2

λ/4

2λ

A photoelectric cell converts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

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°

In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie

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Ultraviolet

Infra red

Visible

X-ray

A force of 10N is acting along y-axis its component along x-axis is

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10N

20N

100N

Zero N

The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to

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√V

V²

1/√V

1/V

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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200 V, 50 Hz

2 V, 50 Hz

200 V, 500 Hz

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

A point charge Q is placed at the mid-point of a line joining two charges 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

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

According to the Hooke's law the force required to change the length of a wire by 'I' is proportional to

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I^-2

I^-1

I

I²

A wire is stretched to double of its length. The strain is

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2

1

zero

0.5

At 0°K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

A prism splits a beam of white light into its seven constituent colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

Choose the correct statement

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Both an ammeter and voltmeter should have small resistance

Both an ammeter and a voltmeter should have large resistance

An ammeter should have large resistance and a voltmeter should have small resistance

An ammeter should have small resistance and a voltmeter should have large resistance

Ultra-violet radiation of 6.2 eV falls on an aluminium surface. K.E. of fastest electron 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

For obtaining appreciable extension, the wire should be

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Short and thin

Long and thin

Short and thick

Long and thick

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

A body of mass 2 kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 m/s², the height at which the K.E, of the body becomes half its original value is given by:

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50 m

12.5 m

25 m

10 m

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

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