Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Electromagnets are made up of:

A
$$steel$$

B
$$copper$$

C
$$soft$$ $$iron$$

D
$$aluminum$$

Solution

Electromagnets are formed by the wounding of conducting wires like coil over the soft iron core.
Hence All option can be correct.
Question 2
1 / -0

In the circuit shown in figure, when the circuit is completed, the hammer strikes the gong. Which of the following force is responsible for the movement of hammer?

A
Gravitational force alone

B
Electrostatic force alone

C
Magnetic force alone

D
Frictional force alone

Solution

When the electric circuit is completed the electromagnet is activated and the soft iron armature is strongly pulled. The hammer strikes the gong producing the sound.
So, the magnetic force is responsible for the movement of hammer.
Question 3
1 / -0

Name one device that uses an electromagnet.

A
Electric bell

B
Barometer

C
Lactometer

D
All the above

Solution

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made of generally iron.
Electromagnets are widely used as components of electrical devices such as Electric Bell ,motors, generators, loudspeakers, hard disks, MRI machines, scientific instruments, etc.
Hence option A.
Question 4
1 / -0

An electric bell works on the .......... effect of a current and uses an ..........

A
Magnetic, Permanent magnet

B
Heating, Electromagnet

C
Magnetic, Electromagnet

D
Heating, Permanent magnet

Solution

An electric bell works with the principle of working of electromagnetism. When the switch is pushed on, the circuit gets completed and the current starts flowing through the U-shaped electromagnet which creates a magnetic field in the core. This attracts the iron armature. When the armature moves towards the electromagnet, the hammer strikes the gong and the bell rings.
Question 5
1 / -0

An electromagnet is a __________.

A
Temporary magnet

B
Permanent magnet

C
Both (A) and (B)

D
None of the above

Solution

An electromagnet is a temporary magnet.
It is because only we use apply electric current; it generates a magnetic field around it & when we stop the current, it looses its magnetic properly. So, we can say that electromagnet is a temporary magnet.
Hence, the answer is Temporary magnet.
Question 6
1 / -0

A fuse is used in an electrical appliance :

A
To earth the appliance

B
To protect the appliance and its cable

C
To change the efficiency of the applicance

D
To change the current rating of the applicance

Solution

Fuse is a device used to prevent overheating of appliances due to a sudden increase in the current in the circuit.
It protects the device and the user. When the electric current is higher than the normal current needed by a circuit, the fuse blows up and breaks the circuit.
Hence, it protects the circuit from a power overload.
Question 7
1 / -0

Which one of the following heater element is used in electric press

A
Copper wire

B
Nichrome wire

C
Lead wire

D
Iron wire

Solution

Heating appliances generally contain coils of high resistance wire made of nichrome alloy. When these appliances are connected to power supply by insulated copper wires then a large amount of heat is produced in the heating coils because they have high resistance.
Question 8
1 / -0

Symbol of electric cell is -

A

B

C

D

Solution

(A) This symbol represents bulb
(B)This symbol represents electric cell
(C)This symbol represents closed switch
(D)This symbol represents open switch
Question 9
1 / -0

The essential requirements for a good heating element are _________________.

A
High resistivity and low melting point

B
High resistivity and high melting point

C
Low resistivity and low melting point

D
Low resistivity and high melting point

Solution

ESSENTIAL REQUIREMENTS OF GOOD HEATING ELEMENT High-specific resistance so that small length of wire may be required to provide given amount of heat. High-melting point so that it can withstand for high temperature, a small increase in temperature will not destroy the element.
Question 10
1 / -0

Which of the following is the correct method of setting a circuit?

A

B

C

D
None of the above