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Published on: 28/08/2019
Magnetic Effects of Electric Current
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Questions + Answers key
Take MCQ Science Test
1.
The most important safety method used for protecting home appliances from short circuiting or overloading is
Earthing
Use of fuse
Use of stabilisers
Use of electric meter.
2.
To convert an AC generator into DC generator
Split-ring type commutator must be used
Slip rings and brushes must be used
A stronger magnetic field has to be used
A rectangular wire has to be used.
3.
The strength of magnetic field inside a long current carrying straight solenoid is
More at the ends than at the centre
Minimum in the middle
Same at all points
Found to increase from one end to the other.
4.
Which of the following property of a proton can change while it moves freely in a magnetic field ?
mass
speed
velocity
momentum
5.
The magnetic field inside a long straight current carrying solenoid
is zero
decrease as we move towards its end
increases as we move towards its end
is the same at all points.
6.
What kind of quantity is magnetic field?
7.
Name the device that converts electric energy into mechanical energy.
8.
Distinguish between DC and AC.
9.
What does an electric current carrying wire behaves like?
10.
What is electric generator?
1.
(b)
Use of fuse
2.
(a)
Split-ring type commutator must be used
3.
(c)
Same at all points
4.
(d)
momentum
5.
(d)
is the same at all points.
6.
It is a vector quantity as it has both magnitude and direction.
7.
An electric motor.
8.
| DC | AC |
| 1. Unidirectional flow of current. | Current changes its direction in a cycle. |
| 2. Cells and batteries produce DC. | Dynamo produces AC. |
9.
It behaves like a magnet.
10.
It is a device that converts mechanical energy into electrical energy.
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