Exploring Magnets — Quiz

Q1. When a bar magnet is suspended freely by a thread tied at its middle, it eventually rests along the

• A. North–south direction
• B. East–west direction
• C. Direction the wind blows
• D. Direction of sunlight

Q2. The end of a freely suspended bar magnet that points towards geographic north is called the

• A. North-seeking pole (North pole)
• B. South-seeking pole
• C. Magnetic equator
• D. Inert pole

Q3. On a bar magnet, the South pole is the end that

• A. Points towards geographic east
• B. Has no particular direction
• C. Points downwards
• D. Points towards geographic south

Q4. A freely suspended magnet rests in the north–south direction because

• A. The wind always pushes it that way
• B. The Sun's rays line it up
• C. The Earth itself behaves like a giant magnet
• D. Iron in the magnet rusts in moist air

Q5. A magnetic compass uses which of the following to find directions?

• A. A needle-shaped magnet that can rotate freely
• B. A piece of copper wire
• C. A wooden pointer
• D. A glass prism

Q6. Reshma puts her compass down on a level table. Once the needle stops moving, it points

• A. Towards the nearest wall
• B. Towards a fluorescent light
• C. Along the north–south direction
• D. Always exactly upward

Q7. Which of these is NOT a part of a typical magnetic compass shown in the chapter?

• A. A magnetised needle
• B. A pin on which the needle balances
• C. A circular dial with directions marked
• D. A small battery

Q8. Ravi wants to magnetise a sewing needle. What should he do?

• A. Heat the needle in a flame and then cool it.
• B. Rub the needle repeatedly with one pole of a bar magnet, always in the same direction.
• C. Pass an electric current from a torch cell through the needle.
• D. Tie the needle to a piece of plastic.

Q9. While magnetising an iron needle using a bar magnet, what is the rule for repeated strokes?

• A. Use both poles alternately, in any direction.
• B. Use the same pole each time, always stroking in the same direction.
• C. Use the same pole each time, but stroke back-and-forth.
• D. Use different poles, but always stroke from left to right.

Q10. When the North pole of one magnet is brought near the North pole of another magnet, the two

• A. Attract each other strongly
• B. Repel each other
• C. Stick together permanently
• D. Show no effect at all

Q11. Two bar magnets attract each other when their facing ends are

• A. Both North poles
• B. Both South poles
• C. One North pole and one South pole
• D. Either of the above (any combination)

Q12. When the North pole of a bar magnet is slowly brought close to the North pole of a compass needle, the needle

• A. Stays exactly where it was
• B. Moves towards the bar magnet
• C. Moves away from the bar magnet
• D. Spins continuously without stopping

Q13. In Activity 4.7, a piece of wood, cardboard, plastic and glass are each placed between a magnet and a compass needle. The needle

• A. Stops responding to the magnet
• B. Still deflects in each case
• C. Only deflects when wood is used
• D. Only deflects when glass is used

Q14. The ‘How to keep the magnets safe?’ box advises against all the following EXCEPT

• A. Heating the magnet
• B. Dropping or hammering the magnet
• C. Storing the magnet wrapped in a soft cloth in a wooden box
• D. Keeping the magnet near a mobile phone

Q15. Which of the following items should a magnet be kept away from?

• A. A wooden ruler
• B. A rubber eraser
• C. Mobile phones and remote controls
• D. A glass tumbler