Question # 1

In which of the following the loss of energy is less.

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Direct current

Alternating current

Thermoelectricity

Photoelectricity

Which part of a simple D.C. motor reverses the direction of current through the coil every half cycle.

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the armature

The commutator

the brushes

The slip rings

Which one of the following describes a measure of opposition to alternating current.

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Electrical impedance

Capacitance

Inductance

Admittance

The magnetic force is simply a

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Reflecting force

Deflecting force

Restoring force

Gravitational force

If air is replaced by any other dielectric medium, the force between two charges.

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Decreases

Increases

Remain the same

Becomes infinity

Which of the following is the ability to hold an electric charge in electromagnetism.

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Resistance

Impedance

Inductance

Capacitance

Object may acquire an excess or deficiency of charge by

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Rubbing them together

Grounding them

Applying coulomb's principle

Shielding them

The relation between the voltage and current that flows in a resistor is.

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V = 1/R

R = vi

V = I2 R

I = V /R

Two magnetic lines of force

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Out near the poles

Never cut each other

Cut at a neutral point

Cut according to position of the magnet

The output of a generator which uses a split ring commutator is.

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sinusoidal A.C. wave

Pulsating D.C. wave

Constant D.C Voltage

Linerly increasing voltage.

The ratio of average induced emf to the rate of changing of current in the coil is called.

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Self induction

Mutual induction

Self inductance

Mutual inductance

The resistance offered by one cubic meter of a substance is known as.

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Reactance

Conductance

Conductivity

Resistivity

When a following field is governed by Maxwell's equations.

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Electrodynamics

Optics

electric circuits

All of these

Coulomb found that the mutual force between tow electric charges varies.

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Inversely as the distance

Inversely as the square of the distance

directly as the distance

Directly as the distance squared

The magnetic field inside a solenoid is

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Zero

Infinite

Uniform

Non uniform

Which of the following parameters is irrelevant for a fuse wire.

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Its radius

Current flowing through it.

Its specific resistance

Its length

No current flows between two charged bodies when connected if they have same.

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Charge

Capacity

Potential

Shape

The circuit in which current and voltage are in phase the power factor is.

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Zero

Unity

Double

4 times

Charge to mass ration of an electron is determined by using the relation.

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e/m = B/rv

e/m = r/vB

e/m = V/Br

e/m = v/r

A charged particles moving in a magnetic field experiences a resultant force.

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Proportional to its K.E.

In the direction of the field

In the direction opposite to its motion

In the direction perpendicular to both the field and its motion

If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is

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5 A

10 A

12 A

15 A

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