Question

To find out whether a metal piece is a magnet or not, what material(s) can one use from the following?

• A. Thread
• B. Compass
• C. A piece of magnetic material
• D. A piece of non-magnetic material

Answer 1

Answer: (A), (B), (C)

The correct options are
A Thread
B Compass
C A piece of magnetic material

If the piece is a magnet, it will always come to align with geographical North-South direction of the Earth when freely suspended using a thread.
If the metal piece is brought near a compass, the compass will start showing deviations from its original alignment.
When the metal piece is brought near a magnetic material, it will attract the material.
Hence, option A,B and C are correct.