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CBSE Class 10 Science Worksheet

Unit IV: Effects of Current - Magnetic Effects of Electric Current

1.
State TRUE/FALSE: A fuse wire is an insulator.
A) TRUE B) FALSE
2.
How is induced current in a secondary coil related to the current in a primary coil?
3.
Write some devices in which electric motors are used.
4.
When is the force experienced by a current carrying placed in a magnetic field largest?
5.
What does the degree of closeness of magnetic field near the poles signify?
6.
Choose the correct option: An electric heater of 1500 W is operated in a domestic electric circuit (220 V). Then to prevent the overloading on the circuit, its current should be ___________.
A) 4A B) 5A C) 10A D) 6.5A
7.
Choose the correct option: If a long hollow copper pipe carries a direct current, the magnetic field associated with the direct current will be___________.
A) Only inside the pipe B) Only outside the pipe C) Both inside and outside the pipe D) Zero everywhere
8.
Fill in the blanks: Commercial motors uses _____________ for generating magnetic field.
9.
Why are magnetic field lines closed curves?
10.
Which type of quantity is magnetic field?
A) Scalar B) Vector C) Tensor D) None of these
11.
State TRUE/FALSE: Force experienced by a conductor carrying current in uniform magnetic is inversely proportional to the magnetic field strength.
A) TRUE B) FALSE
12.
What is the field line of a magnetic field passing through the straight current carrying conductor?
A) Straight line B) Helical C) Circular D) Elliptical
13.
State TRUE/FALSE: Isolated magnetic pole don't occur.
A) TRUE B) FALSE
14.
Choose the correct option: A fuse in an electric circuit acts as a _________.
A) Voltage multiplier B) Safety device C) Current multiplier D) None of these
15.
Choose the correct option: Fuse wire is always connected to ____________.
A) Neutral wire B) Livewire C) Either live wire or neutral wire D) None of these
16.
What happens to the direction of rotation of a motor if both current and magnetic field were reversed simultaneously?
17.
State TRUE/FALSE: Magnetic field of lines intersect each other.
A) TRUE B) FALSE
18.
What is used to changes the direction of current in the coil?
A) Armature B) Commutator C) Slip rings D) None of these
19.
Why two magnetic field lines never intersect each other?
20.
State TRUE/FALSE: Magnetic fields are produced due to stationary charges.
A) TRUE B) FALSE

CBSE Class 10 Science Worksheet

Unit IV: Effects of Current - Magnetic Effects of Electric Current

Answers

1.
Option B

2.
When the current in primary coil changes, the induced current in the secondary coil also changes.
3.
Electric fan, Mixers, Washing machine, MP3 player.
4.
When the conductor is kept perpendicular to the direction of the magnetic field.
5.
It signifies the crowding of magnetic field lines which indicates that the magnetic field in that region is strong.
6.
Option C
7.
Option B

8.
Electromagnet
9.
The direction of field lines outside a magnet is from Nort pole to South pole while it is from South to North pole inside the magnet and thus forms closed curves.
10.
Option B
11.
Option B
12.
Option C
13.
Option A
14.
Option B
15.
Option B

16.
The direction of rotation would remain unchanged.
17.
Option B
18.
Option B

19.
If two lines intersect, it means that the force is acting in two directions at that point which is not possible.
20.
Option B
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