Question # 1

Which of the following quantity is defined in terms of the rate of change of electric displacement field.

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Conventional current

Electronic current

Displacement current

Pulsating current

In a galvanometer the enameled copper wire is wound on.

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An insulator

A non magnetic material

A magnetic material

A conductor

The device in the circuit that consume electrical energy are known as.

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Resistors

Capacitors

Fuses

Load

The basic quantity used to describe the state of magnetization of a substance is the

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Magnetic strength

Magnetic susceptibility

Magnetic moment

Magnetic moment per unit volume

A single silicon photovoltaic cell produces a voltage of the order of.

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0.3 V

0.6 V

0.9 V

1.2 V

If we make the magnetic field stronger the value of induced emf is.

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Decreased

Increased

Vanished

Kept constant

Why does a transformer have a core made of iron.

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Iron has a high melting point

Iron is a magnetic material

Iron potential and high current

Iron is a conductor of electricity

Para magnetism is.

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A distrotion effect

An orientation effect

A skin effect

A resistance

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

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Decreases

Increases

Remains unaffected

Is zero

The mains frequency in Pakistan is

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20 Hz

50 Hz

40 Hz

60 Hz

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

What is emitted by the hot metal filament in a cathode ray tube.

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Alpha particles

Electrons

Protons

X rays

What is the power factors of wattles current.

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Infinity

Unity

0.5

Zero

The permittivity of a medium.

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Is a measure of the density

Is equal to unity for air

Depends on the charge derisory of the medium

Determines the magnitude of an electric field that can be established by the medium

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

A D.C Motor converts

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

Such an inductor coil which does not consume energy and is often employed for controlling A.C. without consumption of energy is called.

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Reactance

Choke

Impendence

Diode

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

A junction between P-Type and n-type materials is called.

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Ampilifier

Transistor

Rectifier

Diode

The electric current can be defined by its

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Chemical effect

Magnetic effect

Heating effect

All of these

An object gain excess negative charge after being rubbed against another object which is.

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Neutral

Negatively charged

Positively charged

either a, b, or c

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