Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

A commutator changes the direction of current in the coil of

A
an AC generator

B
a DC motor

C
a DC motor and an AC generator

D
a DC motor and a DC generator

Solution

The commutation in DC machine or more specifically commutation in DC generator is the process in which generated alternating current in the armature winding of a dc machine is converted into direct current after going through the commutator and the stationary brushes. Again in DC Motor, the input DC is to be converted in alternating form in armature and that is also done through commutation. This transformation of current from the rotating armature of a DC machine to the stationary brushes needs to maintain continuously moving contact between the commutator segments and the brushes.
Question 2
1 / -0

The magnetic field lines due to straight wire carrying a current are-

A
Straight

B
Parabolic

C
Elliptical

D
Circular

Solution

The nature of the magnetic field lines around a straight current carrying conductor is concentric circles with centre at the axis of the conductor.
Question 3
1 / -0

The power of an electric motor can be increased by

A
By decreasing the area of cross – section of the coil.

B
By increasing the number of turns in the coil.

C
By decreasing the strength of the magnetic field.

D
All of these

Solution

The power of an electric motor can be increase by one or all of the following means:
(i) By increasing the number of turns in the coil.
(ii) By increasing the area of cross section of the coil.
(iii) By increasing the strength of the radical magnetic field.
(iv) By increasing the magnitude of the current flowing the coil.
Question 4
1 / -0

What capacity of fuse wire is to be used for geyser?

A
5A

B
15A

C
10A

D
20A

Solution

The power circuit with a 15 A fuse is used for running electric heater, electric iron, geyser, refrigerator etc as it draws more current.
Question 5
1 / -0

A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is pushed into the coil with its north pole entering first

A
The needle of the galvanometer shows a momentary deflection towards left

B
The needle of the galvanometer shows a momentary defection towards right

C
The needle of the galvanometer shows no deflection

D
The needle of the galvanometer shows a momentary defection upward

Solution

When a bar magnet is pushed into the coil of insulated copper wire connected to a galvanometer, an induced current is set-up in the coil due to change of magnetic field through it. As a result, galvanometer gives a deflection (say towards left).
Question 6
1 / -0

The phenomena of electromagnetic induction is

A
the process of rotating coil of an electric motor.

B
the process of charging a body

C
producing induced current in a coil by the relative motion between a magnet and the coil

D
the process of generating magnetic field due to a current passing through a coil

Solution

When a straight coil and a magnet are moved relative to each other, a current is induced in the coil. This phenomenon is known as electromagnetic induction.
Question 7
1 / -0

The device used for producing current is called

A
voltmeter

B
galvanometer

C
ammeter

D
generator

Solution

Electric current is produced by electric generator which converts mechanical energy into electricity.
Question 8
1 / -0

The magnetic axis of earth makes an angle of ___________ with geographic axis of earth.

A
16⁰

B
20⁰

C
17⁰

D
18⁰

Solution

Magnetic axis is the line passing through earth’s magnetic north and south poles which is inclined at an angle of nearly 17° with the geographic axis.
Question 9
1 / -0

What type of currents is produced by most of the power stations in India?

A
AC current having frequency of 100 Hz

B
AC current having frequency of 50 Hz

C
DC current having frequency of 100 Hz

D
DC current having frequency of 50 Hz

Solution

Most of the power stations in India produce alternating current. The alternating current produced in India changes its direction after every 1/100 th of a second. India got 50Hz, because it was colonized by England, which when they developed their electrical systems, choose 50 Hz.
Question 10
1 / -0

What is the current rating of domestic circuits used for appliances like electric bulb, tube light and fans?

A
2 ampere

B
15 ampere

C
5 ampere

D
10 ampere

Solution

The lighting circuit with a 5 A fuse is used for running electric bulbs, fan, radio, TV, tube lights etc

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Magnetic Effects of Electric Current Test - 10

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Magnetic Effects of Electric Current Test - 10

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Question 1

an AC generator

a DC motor

a DC motor and an AC generator

a DC motor and a DC generator

Solution

Question 2

Straight

Parabolic

Elliptical

Circular

Solution

Question 3

By decreasing the area of cross – section of the coil.

By increasing the number of turns in the coil.

By decreasing the strength of the magnetic field.

All of these

Solution

Question 4

5A

15A

10A

20A

Solution

Question 5

The needle of the galvanometer shows a momentary deflection towards left

The needle of the galvanometer shows a momentary defection towards right

The needle of the galvanometer shows no deflection

The needle of the galvanometer shows a momentary defection upward

Solution

Question 6

the process of rotating coil of an electric motor.

the process of charging a body

producing induced current in a coil by the relative motion between a magnet and the coil

the process of generating magnetic field due to a current passing through a coil

Solution

Question 7

voltmeter

galvanometer

ammeter

generator

Solution

Question 8

160

200

170

180

Solution

Question 9

AC current having frequency of 100 Hz

AC current having frequency of 50 Hz

DC current having frequency of 100 Hz

DC current having frequency of 50 Hz

Solution

Question 10

2 ampere

15 ampere

5 ampere

10 ampere

Solution

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16⁰

20⁰

17⁰

18⁰