Question # 1

Which of the following can be used to calculate electrical power.

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Current x resistance

Potential difference x current

Potential difference / current

Potential difference /resistance

The unit of time constant RC is.

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Second

second-1

Second -2

Second 2

A radio tuning capacitor is.

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Cylindrical capacitor

Spherical capacitor

parallel plates capacitor

Cylindrical condenser

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

In which device is a permanent magnet used

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An electric bell

An electromagnet

A plotting compass

A relay

The work done is moving a very small charge in an electric field from one point to another is

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Independent of the path

Equal to the potential difference between the two points.

Measured in V m-1

Measured in J c-1

The basic circuit element is a D.C. circuit is

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An inductor

A resistor

A capacitor

A battery

The magnetic field inside a solenoid is

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Zero

Infinite

Uniform

Non uniform

At which temperature a ferromagnetic material is converted into a paramagnetic one.

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curie temperature

Boyle's temperature

Natural temperature

Neutral temperaturre

In which form energy is stored in acondenser.

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Electric energy

Potential energy

Kinetic energy

Magnetic energy

The unit of magnetic induction is.

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weber -metre

weber -metre 2

weber-meter-2

weber-metre-1

The measure of how strongly a material oppose the flow of electrical current is known as

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Electrical resistivity

Specific electrical resistivity

Volume resistivity

All of the above

A 100 Hz A.C. is following in A 7 mH inductance What is its reactane.

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0.4 Ohms

4.4 Ohms

7Ohms

44 Ohms

As electric field intensity is a potential gradient, if may be expressed ni the units of NC-1 or

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volt

Volt metre

Volt per metre

Joule

Why is an oxide coated filament used in vacuum tube.

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It has a longer lime

Irt can with stand high

It emit electrons at low temperature

It reduces the effect of space charge

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

The current passing through the switch s will be

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Zero

3 A

4.5 A

10 A

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

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

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

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Resistance

Impedance

Inductance

Capacitance

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

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Magnetic flux

electric flux

Electric field

Magnetic field

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