Question # 1

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

A device that shows the visible path of ionizing particle is called.

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GM counter

Solid state detector

Scalar

Wilson cloud chamber

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

The potential difference between the head and tail of an electrical to

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600 Volt

700 Volt

800 Volt

900 Volt

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

Balmer series lies in

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Visible region

Invisible region

Ultraviolet region

Infrared region

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