Question # 1

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

A forward based p-n semiconductor diode is called.

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Photodiode

Photovoltaic cell

Amplifier

Ligh emitted diode

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

Which law states that magnetization is inversely proportional to temperature for a fixed value fo the field.

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Curie's law

Voltmeter

Ammeter

Wattmeter

At room temperature the p.d. between the two sides of depletion region for germanium is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

Which current can pass through a capacitor continuously.

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Alternating current

Direct current

Eddy current

Pulsating current

An electrical device is rated at 12 W , 2 A How many 1.5 V batteries are needed in the device.

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2

4

6

8

The highest value reached by the voltage or current in one cycle is its.

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Top value

Maximum value

Average value

Peak value

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 straight wire carrying current will experience a force when placed in a 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

What happens to a soap bubble, when some charge is given to it.

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It collapses

It increases in size

It decreases in size

It feels nothing

The coulomb's law is valid for the charges which are.

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Moving and point charges

Moving and non point charges

Stationary and point charges

Stationary and large size charges

Which of the following statemtents is worng.

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Charge is quantized

Charge is conserved

There is not field near an isolated charge at rest

A moving charge produces both electric and magnetic field.

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

If the output voltage is not smooth but pulsating then it can be made smooth by using a circuit known as.

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Filter

Gate

shunt

Fuse

When ever current is drawn from a cell Its terminal potential difference and emf become

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Different

Same

Zero

Negative

One volt is equal to.

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One joule per coulomb

One dyne per coulomb

One newton per coulomb

One watt second

When the battery is being charged its terminal potential difference than its emf is.

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Less

Greater

Double

Squared root

The relation between the voltage and current that flows in a resistor is.

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V = 1/R

R = vi

V = I2 R

I = V /R

A voltmeter is a

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High resistance galvanometer

Low resistance galvanometer

Zero resistance galvanometer

Infinite resistance galvanometer

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

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