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Yes or No: 1 Mark
Reasons: 4 Marks
Yes, magnets can lose their magnetic property.
Magnets lose their properties if they are heated, hammered or dropped from some height. Take care to protect the magnets against mechanical shock. Some magnets are brittle. They will crack or breakif they fall on a hard surface or bang against metal or another magnet. Do not strike them with a hammer.Also, magnets become weak if they are not stored properly. To keep them safe, bar magnets should be kept in pairs with their unlike poles on the same side.

Answer: Option D. -> Nickel   
:
D
Materials which gets attracted to a magnet are called magnetic substances. Materials which don't get attracted to a magnet are called non-magnetic substances. Glass, wood and chinaware are not attracted to magnets, so, they are non - magnetic materials. Nickel is attracted to a magnet, hence, it is a magnetic material.

Answer: Option C. -> Magnetic compass 
:
C
A magnetic compass is a tool used for navigation. A magnetic compass aligns in North-Southdirection. This is because Earth behaves like a huge magnet and the poles of the Earth behave like poles of a huge bar magnet. As such, a freely suspending magnet gets attracted to the opposite poles and rotates in the direction of attraction. This direction is the North-South direction.

Answer: Option B. -> False
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B
Magnetic materials like cobalt, nickel and iron are always attracted by magnets. Magnets cannot repel them, as magnets can only repel other magnets because they have poles, and like poles repel each other.

Answer: Option A. -> attract
:
A
Every magnet has two poles i.e North pole and South pole. Unlike poles of magnets attract and like poles of magnets repel each other. So, when the South pole of a bar magnet is brought near the North pole of a ring magnet, they will attract each other.

Answer: Option A. -> Lodestone
:
A
Lodestone is a naturally occurring magnet. In ancient times, it was used as a compass to determine directions. A lodestone, when suspended aligns in North-South direction.

Answer: Option C. -> equal to 
:
C
A magnet has two poles i.e north pole and south pole. In a bar magnet, strength of the north pole is always equal to strength of the south pole.

Answer: Option D. -> Iron nail
:
D
Materials which gets attracted by a magnet are called magnetic materials. In the given options only iron is amagnetic material.Hence, an iron nailgets attracted toa magnet and the rest don't.

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Solution: 5 Marks
A compass is an instrument which is used to find the direction of a magnetic field. A compass consists of a small metal needle which is magnetized and is free to turn in any direction. Therefore, in the presence of a magnetic field, the needle is able to line up in the same direction as the field.
Compasses are mainly used in navigation to find direction on the earth. This works because the Earth itself has a magnetic field which is similar to that of a bar magnet. The compass needle aligns with the Earth's magnetic field direction and points north-south. Once you know where north is, you can figure out any other direction.

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Entire Conversion: 5 Marks
The iron strip can be converted into a magnet by 'touch and stroke' method. For this, a bar magnet is required. The bar magnet is moved along the length of the iron strip. Thus, the bar magnet is lifted from the other end and brought to the starting point again with the same pole of the bar magnet its moved back. On repeating the process for at least 40 to 50 times, the iron strip will become a bar magnet with two poles.