Question
A soft-iron bar is not magnetised. It is held close to the N pole of a magnet and then to the S pole of the same magnet.
What will be the result?
| N pole | S pole |
A | attracts | attracts |
B | attracts | repels |
C | repels | attracts |
D | repels | repels |
Answer/Explanation
Ans: A
Question
Diagram 1 shows a small compass needle with its poles marked. It is not near any magnetic materials.
Diagram 2 shows a bar magnet with its poles marked. The compass needle is placed at point P.
In which direction will the N pole of the compass needle point?
to the left
to the right
down the page
up the page
Answer/Explanation
Ans: B
Question
Which diagram shows the pattern and direction of the magnetic field lines around a bar magnet?
Answer/Explanation
Ans: C
Question
The ends of three metal rods are tested by holding end Q of rod 1 close to the others in turn. 
The results are as follows.
End Q attracts end R.
End Q attracts end S.
End Q attracts end T.
End Q repels end U.
Which of the metal rods is a magnet?
rod 1 only
rod 1 and rod 2
rod 1 and rod 3
rod 3 only
Answer/Explanation
Ans: C
Question
Why is soft iron used for the core of an electromagnet?
A Soft iron easily becomes a permanent magnet.
B Soft iron is a good electrical conductor.
C Soft iron is a poor thermal conductor.
D Soft iron loses its magnetism when the current in the coil is switched off.
Answer/Explanation
Ans: D