Question # 1

The negative of the potential gradient is

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Potential energy

Electrostatic force

Electric field intensity

Electromotive force

The cause of ferromagnetism is.

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Orbital motion of elections

spin Motion of electrons

Permanent dipole memento

Spin angular momentum

Alternating current generator consists of a coil and a pair of.

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Split rings

Slip rings

Metal rings

Copper rings

The rms value of alternating current is always

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Infinity

Unity

Positive

Negative

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

The ratio of the rms value of the applied voltage to the rms value of resulting A.C. is called.

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Reluctance

Impedance

Reactance

Resistance

Which quantity decay exponentially when a capacitors is discharged.

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Charge only

Charge and voltage only

Charge and current only

Charge voltage and current

Which one of the following is diamagnetic

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Liquid oxygen

Air

Water

Copper sulphate

Inductance are measured in

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Coulombs

Volts

Henrys

Farads

Resistance and resistivity of a substance

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Increase with rise in temperature

Decrease with rise in temperature

Remains same at every temperature

Increases at high voltage

Why is an oxide coated filament used in vacuum tube.

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It has a longer lime

Irt can with stand high

It emit electrons at low temperature

It reduces the effect of space charge

Where is the velocity of electrons maximum in a diode.

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Near the cathode

Near the anode

In the space ini between the two elecrode.

It is same throughout the tube

The ratio of the magnitude of charge on one of the two conductors in proximity to the potential difference between the two is called.

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Inductance

Reactance

Resistance

Capacitance

Which of the following has teh maximum permeability.

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Paramagnetic substances

Ferromagnetic substances

Diamagnetic substances

Iron oxide

How are the electrons produced in a cathode ray tube.

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By applying an electric field to the x plates

By heating a metal filament

By ionization of the air

By radioactive decay

What is the power factors of wattles current.

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Infinity

Unity

0.5

Zero

The Step up transformer

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Increase the input current

Increases the input voltage

Has more turns in the primary coil

Has less time in the secondary coil

The mains frequency in Pakistan is

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20 Hz

50 Hz

40 Hz

60 Hz

The cathode ray oscilloscope is used

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For viewing the wave shape of rapidly changing electric current

As voltmeter

For measuring time intervals between electricalimpulses

All of the above

The cathode ray oscilloscope is used for

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Displaying the waveform of given voltage

Displaying the wave form of given vibrations

Rectifying a.c to d.c.

Rectifying D.C. to A.C.

Inserting a di electric between the plates of a charged parallel plate capacitor.

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Decrease the capacitance

Leaves teh capacitance the same

Encourages breakdown between the plates

Reduces the electric intensity between the plates

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