Question # 1

The effective resistance in an A.C. circuit is

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An inductance

An impedance

A mutual inductance

Always zero

Electric field lines

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Start from a negative charge and terminal ate on a positive charge

Never cross each other

Always cross each other

Leaving a positive charge are not proportional to the maginitud of charge

When a magnet is moved into the coil of wire there is a small reading on the galvanometer Which change would increase the size of the reading.

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Pushing in the S-pole

Pulling the magnet out

Unwinding some of the turns of wire

Moving the magnet faster

They hysteresis losses are eliminated in power transformer by using

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Low resistivity power winding

Low reflectance steel cores

Laminated steel cores

soft iron cores

Which law states that an induced current is always in such a direction as to oppose the motion or change causing it.

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Ampere's law

Gauss's law

Lenz's law

Kirchoff's law

The impedance of a pure anti resonant circuit at resonance is.

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Zero

Unity

Infinity

0.5

What does a dynamo generate

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Electrons

Emf

anion

Cation

If a person winds a coil of wire around a steel rod and then passes an electric current through the wire then the

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Steel rod becomes an electromagnet

Steel rod becomes hot

Wire becomes magnetized

wire becomes demagnetized

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

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Alpha particles

Electrons

Protons

X rays

The resistance of a wire does not depend upon.

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Area of cross section of the wire

Length of the wire

Temperature of the wire

Current passing though the wire

Magnetic fields do not interact with

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Stationary electric charges

Stationary permanent magnets

Moving electric charges

Moving permanent magnets

If a capacitor is charged by using a 1.5 V battery, how much charge will capacitor gain.

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0 V

0.5 V

1.5 V

3 V

A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.

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To increase the resistance of the circuit

To make it easier for the current to flow

To protect the wiring form overheating

To reduce the voltage across thelamp

Under which of the following conditions current in a circuit is wattles.

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When inductance in the circuit is zero

When resistance in the circuit is zero

When current is alternating

When resistance and inductance both are zero

Which of the following is not an application of diodes.

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A filters

Bridge rectifier

Half wave rectifier

Full wave rectifier

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

The magnetic induction is also called the

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Magnetic intensity

Magnetic flux

Magnetic flux density

Magnetic magnetization

A number of spherical capacitors of different radii have same potentials The surface charge density on them

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I equal

Is proportional to their radii

Is inversely proportional to their radii

Is inversely proportional to square of their radii

A system of the equal and opposite point charges separated by a small distance is called.

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A capacitor

A dipole

An iinductor

A di electric

The terminals of a battery are joined by a length of resistance wire Which change on its own will increase the current though the battery.

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Connecting the wire with plastic insulation

Covering the wire with plastic insulation

Using a shorter wire of the same material and the same thickness

Using a thinner wire of the same material and the same thickness

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

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Zero

Unirorm

Non uniform

Negative

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