CBSE Class 6 Science Exploring Magnets (Class 6 NCERT New) Quiz 10

1. A student has two bar magnets and notices that one end of Magnet A strongly repels one end of Magnet B. The student then brings the opposite end of Magnet A close to the same end of Magnet B. What will happen, and why?

A They will repel again, because all ends of magnets repel each other B They will attract, because opposite poles attract each other C Nothing will happen, because the magnets are too far apart D They will repel, because the same poles are now facing each other

2. A student draws magnetic field lines for a bar magnet but draws them crossing each other near the north pole. Why is this drawing incorrect, and what does it tell us about how magnetic field lines actually behave?

A The drawing is correct; field lines can cross at the poles B The drawing is incorrect; field lines never cross because each point in a magnetic field has only one direction C The drawing is incorrect; field lines only exist inside the magnet D The drawing is correct; field lines always cross near the poles where the force is strongest

3. A compass needle always points toward the geographic North Pole of the Earth. Using your knowledge of magnetic poles, explain what this tells us about Earth's geographic North Pole in terms of magnetism.

A Earth's geographic North Pole acts as a magnetic north pole B Earth's geographic North Pole acts as a magnetic south pole, because opposite poles attract C Earth has no magnetic poles; the compass points north due to gravity D Earth's geographic North Pole repels the compass needle northward

4. A student wants to separate iron filings from a mixture of iron filings and sand. Which strategy using magnets would best help the student, and why?

A Place the mixture in water and wait for the iron to sink, then use a magnet to confirm B Pass a magnet over the mixture so that the iron filings are attracted to it and separated from the sand C Heat the mixture so the iron melts and then use a magnet to pull it away D Use a magnet to push the sand away, leaving the iron filings behind

5. Two magnets are placed with their north poles facing each other. A student claims that if they push the magnets hard enough together, the poles will eventually attract. Is the student correct? Justify your reasoning based on the properties of magnetic poles.

A Yes, because applying enough force can change the polarity of a magnet B No, because like poles always repel each other regardless of the force applied C Yes, because the magnetic force weakens when magnets are very close together D No, because magnets lose their magnetism when pushed together

6. A student cuts a bar magnet in half. What will most likely happen to the two pieces?

A Each piece will have only one pole — one piece will have a north pole and the other a south pole B Each piece will become a new magnet with both a north pole and a south pole C Both pieces will lose their magnetism completely D One piece will become stronger and the other will become weaker

7. Which of the following best explains why a material like copper is NOT attracted to a magnet?

A Copper is too heavy for a magnet to attract B Copper does not have magnetic domains that align with a magnetic field C Copper has too many poles that cancel each other out D Copper melts when placed near a magnet

8. A student observes that closely spaced magnetic field lines indicate a stronger magnetic field, while widely spaced lines indicate a weaker field. Using this knowledge, where on a bar magnet would the field lines be most closely spaced, and what does this mean about the force at that location?

A In the middle of the magnet; the force is weakest there B At the poles of the magnet; the force is strongest there C Along the sides of the magnet; the force is evenly distributed D Everywhere equally; the spacing of field lines does not change

9. An engineer is designing a device that needs to pick up heavy iron objects in a junkyard and then release them on command. Which type of magnet should the engineer use, and why?

A A permanent bar magnet, because it is always strong enough to lift heavy objects B An electromagnet, because its magnetic force can be turned on and off by controlling the electric current C A lodestone, because it is a natural magnet and very powerful D A horseshoe magnet, because its shape makes it the strongest type of magnet

10. A student tests four materials — iron, aluminum, plastic, and nickel — with a magnet. Iron and nickel are attracted to the magnet, but aluminum and plastic are not. What conclusion can the student draw about which materials are ferromagnetic?

A Only iron is ferromagnetic because it is the most common magnetic material B Iron and nickel are ferromagnetic because they are strongly attracted to the magnet C Aluminum is ferromagnetic because it is a metal like iron D All metals are ferromagnetic, so aluminum must also be ferromagnetic