Question # 1

The induced current in a circuit can be increased by

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Using a strong magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All of the above

An A.C. dynamo operates on the principle of

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Mutual induction

Self induction

Electromagnetic induction

Mechanical induction

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 5 C of charge flows through a particular resistor 10 J of energy is converted What is the p.d. across the resistor.

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0.5 V

2.0 V

15 V

50 V

Conductance is the reciprocal of.

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Capacitance

Inductance

Resistance

Admittance

The ratio of the magnitude of charge on one of the two conductors in proximity to the potential difference between the two is called.

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Inductance

Reactance

Resistance

Capacitance

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

Which of the following has teh maximum permeability.

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Paramagnetic substances

Ferromagnetic substances

Diamagnetic substances

Iron oxide

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

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

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

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Magnetic flux

electric flux

Electric field

Magnetic field

When a current of 2 A flows for 5 s through a lamp 120 W of power are used How much charge flows through the lamp.

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10 C

12 C

24 C

60 C

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

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

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

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

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A few miliamperes

10² A

10³ A

10⁴ A

Which electrical component may be used to store electrical energy in a time delay circuit

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Capacitor

Light dependent resistor

Resistor

Thermistor

The value of electric field intensity is.

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Volt

Coulomb

Newton

Newton coulomb

The energy supplied in charging a capacitor resides after the charging in.

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The magnetic field

The electric field

the battery

The moving conduction charges

Capacitance is directly proportional to

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Distance between the plates

Di electric strength

Area of the plates

Charge multiplied by the applied voltage

When the frequency of A.C in L - C- R circuit is incrased the impedance of L-C-R circuit.

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Increase

Decrease

Remain unchanged

First decrease and then increases

What is the range of values of power factor.

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0 to -1

0 to +1

0 to 2

2 to 3

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