MCQ on Exploring Magnet Class 6
Class 6 Science Chapter 4 MCQ Exploring Magnet
Multiple Choice Questions :
Question 1.
Which of the following gets attracted to a magnet?
(a) Plastic comb
(b) Iron clip
(c) Paper notebook
(d) Silver cup
Answer:
(b) Iron clip
Question 2.
Which among the following in the given options is an example of a magnetic substance?
(a) Cobalt
(b) Nickel
(c) Iron
(d) All of these
Answer:
(d) All of these
Question 3.
A mixture contains sand and iron dust. How can the iron dust be separated from sand? Competency Based Que.
(a) Blow air over the mixture
(b) Sieve the mixture using a strainer
(c) Pour water in the mixture and then filter it
(d) Spread the mixture and run a magnet all over it
Answer:
(d) Spread the mixture and run a magnet all over it
Question 4.
North pole of a magnet can be identified by
(a) another magnet having its poles marked as north pole and south pole
(b) another magnet no matter whether the poles are marked or not
(c) using an iron bar
(d) using iron filings
Answer:
(a) another magnet having its poles marked as north pole and south pole
Question 5.
A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filings clinging to the NCERT Exemplar
(a) north pole is almost equal to the south pole
(b) north pole is much less than the south pole
(c) south pole is much less than the north pole
(d) magnet will be same all along its length
Answer:
(a) north pole is almost equal to the south pole
Question 6.
Three magnets A, B and C were dipped one-by-one in a heap of iron filings. Figure shows the amount of the iron fillings sticking to them.
The strength of these magnets will be NCERT Exemplar
(a) A>B>C
(b) A<B<C
(c) A=B=C
(d) A<B>C
Answer:
(a) A>B>C
Question 7.
A freely suspended magnet always points in the
(a) upside down
(b) east-west direction
(c) north-south direction
(d) Any direction by chance
Answer:
(c) north-south direction
Question 8.
Which of these will convert an iron rod into a magnet?
Competency Based Que.
(a) Bury the iron rod in soil for a week.
(b) Hit the iron rod with a hammer ten times.
(c) Place the iron rod in a stack of iron bars for a month.
(d) Rub the iron rod against a permanent magnet fifty times.
Answer:
(d) Rub the iron rod against a permanent magnet fifty times.
Question 9.
Attraction is seen between the poles of two bar magnets in the case of
(a) north pole of one magnet with the north pole of other
(b) south pole of one magnet with the south pole of other
(c) north pole of one magnet with the south pole of other
(d) All of the above
Answer:
(c) north pole of one magnet with the south pole of other
Question 10.
Which pair of cars will repel each other?
Competency Based Que.
(a) Pair 3 only
(b) Pair 4 only
(c) Both pair 1 and pair 3
(d) Both pair 2 and pair 4
Answer:
(c) Both pair 1 and pair 3
Question 11.
Which of these arrangements is best for storing a pair of bar magnets? Competency Based Que.
Answer:
Question 12.
The magnetic properties can be destroyed by
(a) hammering
(b) heating
(c) Both (a) and (b)
(d) None of these
Answer:
(c) Both (a) and (b)
Question 13.
Which of the following is a non-magnetic object?
(a) An iron key
(b) A stainless steel spoon
(c) A wooden tray
(d) Both b and c
Answer:
(d) Both b and c
Question 14.
Which of the following material can be magnetized?
(a) A plastic scale
(b) A sewing needle
(c) A silver coin
(d) A glass sheet
Answer:
(b) A sewing needle
Question 15.
Which two poles repel each other?
(a) North-North
(b) South-North
(c) North-South
(d) Both b and c
Answer:
(a) North-North
Question 16.
A long bar magnet is broken into 5 pieces. Total number of poles formed will be
(a) 2
(b) 4
(c) 6
(d) 10
Answer:
(d) 10
Fill in the Blanks :
1. A _________ is a naturally occurring rock having a property of attracting small pieces of iron.
Answer:
Lodestone
2. Horse shoe magnet is an example of _________ magnet.
Answer:
artificial
3. _________ pole of a magnet is generally coloured with red.
Answer:
North
4. When a bar magnet is broken into four pieces, there will be a total of _________ poles.
Answer:
8
5. In artificial magnets, magnetic attraction is strongest near the _________.
Answer:
poles
6. A _________ always rests itself in north-south direction.
Answer:
compass needle/ freely suspended magnet
7. The south pole of the earth’s magnet is near the geographical _________ pole.
Answer:
north
8. Like poles _________ each other.
Answer:
repel
9. Magnetic compass is used to find _________
Answer:
directions
10. Hammering destroy the _________ of a small magnet.
Answer:
magnetic properties
11. A freely suspended magnet always aligns itself in _________ direction.
Answer:
north-south
12. The end of a magnet with a dot represents _________ pole.
Answer:
north
13. Nickel is a _________ material.
Answer:
magnetic
14. Keep magnets in pairs with _________ poles on the same side.
Answer:
unlike
True/False :
1. The substances having the ability to attract iron are called magnets.
Answer:
True
2. Magnetite is an artificial magnet.
Answer:
False
3. Copper cannot be magnetized.
Answer:
False
4. Ball-ended magnet is an example of artificial magnet.
Answer:
True
5. An iron bar can be magnetized by heating.
Answer:
False
6. Dropping a magnet from height does not affect its magnetic properties.
Answer:
False
7. Like poles attract each other while unlike poles repel each other.
Answer:
False
8. A freely suspended magnet always rests itself in north-south direction.
Answer:
True
9. Bar magnet is a natural magnet.
Answer:
False
10. A permanent magnet is a device that retains a magnetic property without a power source.
Answer:
True
11. Magnetic field is a region around a magnet within which the force of magnetism acts.
Answer:
True
Match the following :
1. Match the phrases in column I with that of column II.
| Column I | Column II |
| (a) Magnet attracts | (i) rests along a particular direction |
| (b) Magnet is repelled | (ii) Lodestone |
| (c) Magnet if suspended freely | (iii) by another magnet in same direction |
| (d) Natural magnet | (iv) iron filings |
Answer:
| Column I | Column II |
| (a) Magnet attracts | (iv) iron filings |
| (b) Magnet is repelled | (iii) by another magnet in same direction |
| (c) Magnet if suspended freely | (i) rests along a particular direction |
| (d) Natural magnet | (ii) Lodestone |
2. A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. Effects observed in each case is given in column I. Possible reasons of the observed effects are given in column II. Match the given statement in Column I with those in Column II.
| Column I | Column II |
| (a) Boat gets attracted towards the magnet. | (i) Boat is fitted with a magnet with north pole towards its head. |
| (b) Boat is not affected by the magnet. | (ii) Boat is fitted with a magnet with south pole towards its head. |
| (c) Boat moves towards the magnet, if north pole of the magnet is brought near its head. | (iii) Boat has a small magnet fixed along its length. |
| (d) Boat moves away from the magnet when north pole is brought near its head. | (iv) Boat is made up of magnetic material. |
| (e) Boat floats without changing.its direction. | (v) Boat is made up of a non-magnetic material. |
Answer:
| Column I | Column II |
| (a) Boat gets attracted towards the magnet. | (iv) Boat is made up of magnetic material. |
| (b) Boat is not affected by the magnet. | (v) Boat is made up of a non-magnetic material. |
| (c) Boat moves towards the magnet, if north pole of the magnet is brought near its head. | (ii) Boat is fitted with a magnet with south pole towards its head. |
| (d) Boat moves away from the magnet when north pole is brought near its head. | (i) Boat is fitted with a magnet with north pole towards its head. |
| (e) Boat floats without changing.its direction. | (iii) Boat has a small magnet fixed along its length. |
Assertion reason questions :
The questions given below consist of an assertion and a reason. Based on that, choose the appropriate option.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
1. Assertion (A) A lot of iron filings are attracted towards the ends of a bar magnet.
Reason (R) The magnetic strength is more near the poles.
Answer:
(a), The magnetic strength of a magnet is maximum at poles, therefore a lot of iron fillings are attracted towards the end of the bar magnet, i.e. the poles.
2. Assertion (A) Magnets lose their magnetic properties on heating.
Reason (R) Magnets should be stored in pairs with unlike poles on the same side.
Answer:
(b), Both the statements tell us the way of storing magnets but nót related to each other.
3. Assertion (A) A horseshoe magnet is a naturally occurring magnet.
Reason (R) It is used in the working of an electric bell.
Answer:
(d), A horseshoe magnet is an artificial magnet, not a naturakone. And it is used in the functioning of an electric bell.
4. Assertion (A) A compass needle always aligns itself in north-south direction.
Reason (R) Magnetic south of the earth which is aligned with geographic north pole, attracts the north pole of the compass needle.
Answer:
(a), A compass needle always aligns itself in north-south direction because the magnetic south of the earth which is aligned with geographic north pole, attracts the north pole of the compass needle.
The questions given below consist of an assertion and a reason. Based on that, choose the appropriate option.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
1. Assertion (A) The poles of freely suspended magnet can be determined by using an iron bar.
Reason (R) Iron bar is a magnetic material that gets attracted towards a magnet.
Answer:
(d) Assertion is false but Reason is true.
2. Assertion (A) No change is observed in the deflectir, of a compass needle when a wooden block is placed between the magnet and the compass needle.
Reason (R) Magnetic effect can act through non-magnetic materials.
Answer:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Case Based Questions :
1. Nikhil is performing an experiment to test 4 metal bars if they are magnets, iron rods or other metal rods. In order to identify that, he tied a bar magnet to a thread and hung it with the help of a wooden stand. He brought the bars one by one towards the bar magnet and recorded his observations in the table given below:
Question i.
What can Nikhil conclude?
(a) Bar 2 and Bar 4 could be magnets.
(b) Bar 1 and Bar 4 are neither magnets nor iron rods.
(c) Bar 2 could be made up of silver.
(d) None of the above
Answer:
(b) Bar 1 and Bar 4 are neither magnets nor iron rods.
Question ii.
Nikhil has now repeated his experiment by using metal wires of the same metals in place of metal bars. Will he see any difference in his observations? Explain.
Answer:
He will not see any difference in his observations. The results will be same as before because shape doesn’t affect the behaviour of the metal bar towards the magnet.
2. Ravi has a bar magnet which accidentally fell on the ground and broke into two pieces. Ravi was worried that the magnet would lose its magnetic properties now. He thought of testing each piece and to his surprise, he found that both the pieces were still attracting iron objects.
Question i.
What happens to a bar magnet when it is broken into two pieces?
(a) It loses its magnetic properties.
(b) Its magnetic strength reduces.
(c) It is converted into two new magnets.
(d) Both b and c
Answer:
(c) It is converted into two new magnets.
Question ii.
If Ravi tested the magnetic strength of the original and broken pieces, what might he find?
(a) The strength of each piece would be less than the original.
(b) The strength of each piece would be greater than original.
(c) Larger piece would have more magnetic strength.
(d) The strength would be the same for both the pieces.
Answer:
(d) The strength would be the same for both the pieces.
3. A compass is an instrument which is used to find the direction and it consists of a small metal needle which is magnetised and is free to turn in any direction. It has a dial with directions marked on it.
The picture shows a magnetic compass and the sun to its east. The four arrows point towards different directions. Competency Based Que.
(i) Which arrow is pointing towards the north?
(a) Arrow 1
(b) Arrow 2
(c) Arrow 3
(d) Arrow 4
Answer:
(c) Arrow 3
(ii) A magnetic compass is placed just beside a bar magnet. Will the compass now show direction correctly? Explain.
Ans.
Compass needle generally aligns itself in north-south direction. But when it is placed beside a bar magnet, it doesn’t show the directions correctly.
A change in the deflection of the compass needle can be seen based on the pole of the bar magnet brought closer to the compass needle.