Question # 1

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

An inductor may store energy in

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Its magnetic field

Its electric field

Its coils

A neighboring circuit

Which of the following a natural example of a capactor.

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Fire

Snow

Air

Lightining

Wattles current is said to flow when phase angle between virtual current and virtual voltage is

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0^o

90 ^o

180 ^o

270^o

A resistor connected to a battery is heated due to current passing through it. Which of the following quantity does not change.

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Resistivity

Resistance

Number of free electrons

Drift velocity

Super conductor are used in

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Fast computer chips

Magnetic resonance imaging

Magnetic levitation trains

All of the above

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

If we double both the current and the voltage in circuit while keeping its resistance constant the power.

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Remains unchanged

Halves

Doubles

quadruples

If the transformer turns ratio is 2 and the impedance of primary coil is 250 Ohms then the impedance secondary coil will be.

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

Which field is produced by electric charge on a body at rest.

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Electric field only

Magnetic field only

Neither electric nor magnetic field

Both electric and magnetic fields

In a simple D.C. motor the direction of current in the motor is reversed every half revolution to keep the motor turning in the same direction which part of the motor does this.

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Brushes

Coil

Commutator

Poles

A charged capacitor has charge on its

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Outside surface

Inner surface

Surroundings

Mid point

What for is a modulator circuit used.

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To eliminate carrier waves

To superpose the radio frequency signal on the carrier waves

To transmit the signal

To create sound waves

The magnetic flux density at the centre of a long solenoid is dependent on.

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The number of turns per unit length of the silenced

The volume of the solenoid

The diameter of each turn of the solenoid

All of above

Why an ammeter is always connected in series in a circuit.

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Its resistance is very high

Its resistance is very low

its resistance is infinity

It does not draw current from the circuit

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

When a positive charge is allowed to move from positive to negative plate, then it will gain

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P.E.

K.E

Gravitational energy

Electrical P.E.

What does the electricity meter record.

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Charge

Current

Energy

Power

Which of the following materials has highest magnetic suscaptibility.

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Uranium

aluminium

Platinum

Sodium

In what form is the energy stored in an inductor.

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Magnetic

electrostatic

Magnetic and electrostatic

All of the above

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

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