Question # 1

House hold circuits are mostly

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Wired in sires

Wired in parallel

Made using wires of gold

Made using wires of silver

What for is semiconductor diode used.

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To convert D.C. to A.C.

To convert A.C. to D.C.

To increase voltage

To decrease voltage

For which material magnetic susceptibility is negative.

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Paramagnetic

Diamagnetic

Ferromagnetic

All of these

In a R-L-C series circuit, when the frequency of A.C. source is high the circuit is.

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R-L Circuit

R-C circuit

L-C circuit

R-L or R-C

The field inside a hollow spherical conductor is.

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Constantin zero

Constant but not necessarily zero

A function of charge on sphere

a function of distance from the centre

Which one of the following represents an ohm.

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Volt per ampere

Joule per second

Watt per ampere

Joule per coulomb

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

The circuit of full wave rectification consists of

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Only one diode

Two diodes

Three diodes

Four diodes

Which of the following is an example of induced magnetism.

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A compass needle pointing north

A north pole attracting iron filings

A northpole repelling a north pole

The coil of a motor turning in a magnetic field.

An uncharged di electric body experience a force when placed in an electric field if.

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A field in non zero at the body

The electric is a polar material

The dielectric is a non polar material

The field is non uniform over the body

Which factor remains constant in a transformer.

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Current

Voltage

Power

Frequency

The phase angle between the voltage and current is A.C. circuit though a resistor is.

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0 ^o

45 ^o

90 ^o

180 ^o

If a conductor sun infirmly stretched so that its length is increased in timed, then its resistance becomes.

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n times the original resistance

1/n times the original resistance

n2 times the original resistance

n3 times the original resistance

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

Potential of earth's surface is.

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Negative

Positive

Zero

Infinite

A germanium atom is

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Monovalent

Diavalent

Travalent

Tetravalent

The unit of magnetic induction is.

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weber -metre

weber -metre 2

weber-meter-2

weber-metre-1

The net charge on a condenser is

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Zero

Q/2

2Q

Infinity

The electric supply line in houses works at 220 V what will be the amplitude of emf.

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120 V

331 V

220 V

440 V

In alternating current circuits the quantity which plays the same role as resistance in direct current circuits is called.

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Reactance

Admittance

Conductance

Impedance

A straight wire carrying current will experience a force when place in uniform magnetic field if

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The current and field are parallel

The current and field are at an angle

the current and field are parallel in opposite directions

All of the above

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