Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 3

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Question 1
1 / -0

In electric heater:

A
Chemical energy is converted to electrical energy

B
Electrical energy is converted to chemical energy

C
Heat energy is converted to electrical energy

D
Electrical energy is converted to heat energy

Solution

When a current passes through an electric heater, it becomes very hot and becomes a source of heat. Therefore, in an electric heater, electrical energy is converted into heat energy.
Question 2
1 / -0

A/an ............... is employed in an electric bell.

A
steel bar

B
electromagnet

C
permanent magnet

D
copper cylinder

Solution

An electromagnet is employed in an electric bell.
When the push button is pressed the electric circuit is completed and the armature is attracted towards the electromagnet. As a result, the small spring gets detached from the screw due to which the electric circuit is broken and the electromagnet is demagnetized. Hence, the attraction disappears and the armature is brought back by the spring to its original position. Contact of the spring with the screw is now remade, which completes the electric circuit. The action is repeated over and over again continuously. The armature vibrates and the hammer attached to it strikes the gong and the bell rings and sound is produced.
Question 3
1 / -0

The longer line in the symbol of a cell denotes

A
the positive terminal

B
the negative terminal

C
the direction of current

D
all of these

Solution

The longer vertical line in the symbol of a cell represents the positive terminal and the shorter line in the symbol of a cell represents the negative terminal.
Question 4
1 / -0

The shorter line in the symbol of a electric cell represents:

A
The positive terminal

B
The negative terminal

C
The direction of current

D
All of these

Solution

The shorter, thicker vertical line in the symbol of a cell represents the negative terminal.
The longer, thinner vertical line in the symbol of a cell represents the positive terminal.
Question 5
1 / -0

A rheostat is used in an electrical circuit

A
to change the resistance of the circuit.

B
to change the potential difference.

C
to change the emf.

D
to change the current through a particular instrument.

Solution

A rheostat is a variable resistor which is used to control current. they are able to vary the resistance in circuit without interruption. the construction of a rheostat is very similar to potentiometer .Thus A rheostat is used in circuit to change the resistance of the circuit. so option correct is A.
Question 6
1 / -0

Which of the following is the symbol for a bulb?

A

B

C

D

Solution

Option D represent symbol of bulb.
Question 7
1 / -0

The figure given represents:

A
switch in the 'ON' position

B
switch in the 'OFF' position

C
circuit breaker

D
battery

Solution

Correct Option is B.
Explanation for the correct answer :
The given figure represents the open circuit. Current do not flows in the circuit, and switch is said to be in OFF position.
Question 8
1 / -0

When the two terminals of a battery are connected directly with a wire then:

A
More electrical energy is stored in the cell

B
The chemicals get used up very fast

C
No current flows in the wire

D
None of these

Solution

When the two terminals of a battery are connected directly with a wire there will be a low resistance path for the current to flow. The wire will get heated a little bit (depends on the diameter of the wire less the diameter more heat) and the battery will be quickly discharged. During depletion, it may become very hot, emit gasses, and possibly explode. The shorting wires will draw heavy current that may melt the wire or even cause them to soften and break.
Question 9
1 / -0

Electric door bell employs

A
Permanent Magnet

B
Electromagnet

C
Thermistor

D
Electric bulb

Solution

An electric bell is a mechanical or electronic bell that functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing, clanging or ringing sound.
Question 10
1 / -0

Which of the following equipment does not work on principle of Joule's law?

A
Electric Heater

B
Electric Iron

C
Electric Bulb

D
Electric Fan

Solution

The electric iron, electric heater and electric bulb are some of the familiar devices based on Joule’s Law, but electric fan is not based on Joule's Law. Thus option $$D$$ is correct.