Question # 1

In modulation, low frequency signal is called

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Fluctuated signal

Loaded signal

Modulated signal

Harmonic signal

The mains frequency in Pakistan is

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20 Hz

50 Hz

40 Hz

60 Hz

In which form energy in an inductance coil is stored.

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Heat energy

Light energy

Magnetic energy

Nuclear energy

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

A magnetic pole

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Is made of a magnetic material

Is a factious quantity

Is defined in terms of Ampere's law

Cannot be detected

The resistance of 10 micro F capacitance, when connected to A D.C. circuit is.

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Zero

Unity

-1

Infinity

Which physical law expresses the relationship between the heat generated and the current through a conductor.

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Ohm's law

Kirchoff's law

Joule's law

Ampere's law

An electrical device is rated at 12 W , 2 A How many 1.5 V batteries are needed in the device.

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2

4

6

8

The charge per unit volt which is a constant property of the system is known as the

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Dielectric constant

Permitivity

Capactance

Inductance

Direct current generators use.

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Coiled rings

Split rings

slip rings

solenoid rings

The cause of production of eddy current is the

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Current flowing in a conductor

Current flowing in a insulator

Motion of a conductor in a varying magnetic field

Motion of an insulator in a varying magnetic field

A resistance is a device which

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Acids the flow of current is a circuit

Converts electrical energy to heat

Is a type of charge pump

Is like a switch

The property of an object that causes it to create a magnetic field in opposition to an externally applied magnetic field is.

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Paramagnetism

Diamagnetism

Ferromagnetism

Demagnetism

The picture to be transmitted must be scanned because in T.V transmission light wave are first changing into.

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sound wave

Electric fluctuations

Magnetic fluctuations

Signals

A resistor whose resistance decreases with increasing intensity is.

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Light dependent resistor

Thermistor

Thermocouple

Strain gauge

High frequency radio wave is called

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Fluctuate wave

Carrier wave

Matre wave

Energetic wave

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

The ration of intensity of magnetization to the magnetic force is known as.

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Parmeability

Magnetic induction

Magnetic intensity

Magnetic susceptibility

The unit of magnetic induction is.

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weber -metre

weber -metre 2

weber-meter-2

weber-metre-1

If a charged body is moved against the electric field it will gain.

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P.E

K.E.

Electrical P.E.

Gravitational energy

With increase in temperature the electrical conductivity of intrinsic conductors.

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Increases

Descreases

Remain unaffected

First increases then decreases

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