Question # 1

The minimum value of charge on any object is.

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1.6 x 10^-29 C

1.6 x 10^-19 C

1.6 x 10^-9 C

1 C

The phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristics temperature is called.

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Resistivity

Conductivity

Super conductivity

Volume resistivity

A choke coil is a coil with

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Low inductance and low resistance

Low inductance and high resistance

High inductance and low resistance

Low inductance and negligible resistance

In order to measure the true emf of an electrolytic cell it is necessary that.

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The measurement be made while charging the cell

No current be drawn from the cell

The cell be connected into a type circuit

The cell be connected into a parallel type circuit

The advantage of LEDs over filament lamp is their

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Small size

Reliability

High operating speed

All of the above

An ammeter can be converted into a voltmeter by connecting a

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Low resistance i series

High resistance in series

High resistance in parallel

Low resistance in parallel

Which of the following materials has highest magnetic suscaptibility.

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Uranium

aluminium

Platinum

Sodium

What is measured by the energy dissipated when a source drives a unit charge round a complete circuit.

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Electromotive force

Potential difference

Power

Resistance

The cosine of the phase angle between the current and voltage in an A.C. circuit is called the

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Lead factor

Lag factor

Dissipation factor

Power factor

What is used in an electric circuit to allow current in one direction only.

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A fuse

An ammeter

A diode

A relay

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

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ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

The unit of time constant RC is.

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Second

second-1

Second -2

Second 2

The Lenz's law is also a statement of the law of conservation of.

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Energy

Mass

Momentum

Torque

In which form energy in an inductance coil is stored.

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Heat energy

Light energy

Magnetic energy

Nuclear energy

In a crystal lattice

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Atoms are arranged in an order way

Atoms are arranged in a random way

Holes are arranged in an order way

Electrons are arranged in an order way

Which of the following is not the SI unit of magnetic flux density.

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Wb m2

N A-1 m-1

Tesla

N mA-1

Slip Rings are used in

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D.C. dynamo

A.C. dynamo

Transformers

Battries

In L - C parallel circuit the coil draws a.

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Lagging current

Leading current

Lagging voltage

Leading voltage

The process of mixing sound waves with carrier waves is known as.

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Rectification

amplification

Modulation

Demodulation

Which electrical component uses a low current circuit to switch a high current ON or OFF.

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Capacitor

Diode

Reed rely

Thermistor

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

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