Class 10 Magnetic Effects Of Electric Current CBSE Questions & Answers

Class 10 · Magnetic Effects Of Electric Current

Class 10 Magnetic Effects of Electric Current CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

A commutator changes the direction of current in the coil of

A
an AC generator
B
a DC moor and an AC generator
C
a DC motor
Correct
D
a DC motor and a DC generator

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

A
Elliptical
B
Circular
Correct
C
Parabolic
D
Straight

The power of an electric motor can be increased by

A
By increasing the number of turns in the coil
Correct
B
By decreasing the strength of the magnetic field
C
All of these
D
By decreasing the area of cross – section of the coil

What capacity of fuse wire is to be used for geyser

A
5A
B
15A
Correct
C
10A
D
20A

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
Correct
B
The needle of the galvanometer shows no deflection
C
The needle of the galvanometer shows a momentary defection towards right
D
None of these

The phenomena of electromagnetic induction is

A
producing induced current in a coil by the relative motion between a magnet and the coil
Correct
B
the process of generating magnetic field due to a current passing through a coil
C
the process of charging a body
D
the process of rotating coil of an electric motor.

The device used for producing current is called

A
generator
Correct
B
voltmeter
C
galvanometer
D
ammeter

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

A
\({\rm{1}}{{\rm{8}}^0}\)
B
\({\rm{1}}{{\rm{6}}^0}\)
C
\({\rm{2}}{0^0}\)
D
\({\rm{1}}{{\rm{7}}^0}\)
Correct

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

A
A. C current having frequency of 50 Hz
Correct
B
D. C current having frequency of 50 Hz
C
D. C current having frequency of 100 Hz
D
A. C current having frequency of 100 Hz

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
10 ampere
D
5 ampere
Correct

Two circular coils each having a radius ‘a’ carry current I and 2I respectively. How do the magnetic fields, at the centres of the two coils compare with each other?

A
The magnetic field at the centre of the second coil is double that at the centre of the first coil
Correct
B
None of these
C
The magnetic field at the centre of the first coil is double that at the centre of the second coil
D
Magnetic fields are same in both

Which of the following involves electro magnetic induction?

A
A magnetic field exerts a force on a current- carrying wire
B
A rod is charged with electricity
C
An electric current produces a magnetic field.
D
The relative motion between a magnet and a coil produces an electric current.
Correct

Statement A : H. C oersted, a Danesh physicist first noticed the magnetic effect of electric current. , Statement B : The strength of the magnetic field is indicated by the closeness of the field lines.

A
Statement B is true, A is false
B
Both the statement A and B are true
Correct
C
Neither statement A nor statement B is true
D
Statement A is true, B is false

Statement A : The line joining the earths magnet is called magnetic axis. , Statement B : chemical energy is converted into electrical energy in AC generator.

A
Statement B is true, A is false
B
Neither statement A nor statement B is true
C
Both the statements A and B are true
D
Statement A is true, B is false
Correct

What does the tangent at any point on magnetic field lines indicate?

A
direction of induced current
B
direction of magnetic field
Correct
C
Direction of current
D
direction of the force