Question # 1

In the equation P = IV cos Theta Cos theta is known as

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Phase angle

Liming angle

Phase

Power factor

Which device converts alternating current to direct current.

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Motor

Generator

Transformer

Rectifier

The immediate cause of alternating currrent in the secondary coil of a transformer is

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A changing electric field

a changing magnetic field

The motion of primary coil

The iron core of the trnasformer

Which law states that magnetization is inversely proportional to temperature for a fixed value fo the field.

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Curie's law

Voltmeter

Ammeter

Wattmeter

A generator running in reverse may be called as.

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A.C. Generator

D.C. generator

Motor

Commutator

A preset or trimmer can be a.

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Variable resistor

Variable capacitor

Variable inductor

All of these

Mutual inductance has a practical role in the performance of the

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Radiochoke

Transformer

Generator

Trnasistor

Which law states that an induced current is always in such a direction as to oppose the motion or change causing it.

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Ampere's law

Gauss's law

Lenz's law

Kirchoff's law

If a di electric is placed between the plates of a capacitor, its capacitance.

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Decreases

Increases

Remains unaffected

Is zero

By placing soft iron inside a coil

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Increases the magnetic flux

Decreases the magnetic flux

Creates no change in magnetic flux

Decreases the diameter of the core

What is the power factor of LR circuit.

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Unity

Zero

infinity

Between 0 and 1

The magnitude of induced emf during electromagnetic induction is controlled by.

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Magnetic flux

electric flux

Electric field

Magnetic field

The thermionic current increases when

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Area of filament is decreased

Area of filament is increased

Temperature is decreased

Work function is increased

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

What is the degree of magnetization of a material.

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Susceptibility

Ablitity

Retentivity

Capacity

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

When forwarded bias is applied to a junction diode it.

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Increases the potential barrier

Decreases the potential barrier

Reduces the majority carrier current to zero

Reduces the minority carrier current to zero

What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A.

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4.8 W

14.5 W

30 W

60 W

The steady current which produces the same heating effect in a resistance in a given time as the alternating current does in the same resistance in the same time is called.

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Induced current

Root mean square value of an alternating current

Mean value of alternating current

Electromotive force

The impedance of a pure anti resonant circuit at resonance is.

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Zero

Unity

Infinity

0.5

What is the part of a simply D.C. motor that reverses the direction of current through the coil every half cycle.

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Armature

Brushes

Commutator

Slip rings

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PPSC Physics Chapter 6 Electricity and Magnetism MCQs With Answers

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