Assertion and Reason: Fun with Magnets | Class 6: Additional Practice PDF Download

The questions below consists of an assertion and a Reason. Use the key to choose the appropriate answer. 
Q1: Assertion: Magnet attracts materials like iron, nickel, cobalt are called magnetic materials.
Reason: Materials that are not attracted to magnets are called non-magnetic materials.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (b)
The assertion is correct. Materials like iron, nickel, and cobalt are indeed attracted to magnets and can become magnetized. These materials are termed magnetic materials.
The reason is also correct. Materials that are not attracted to magnets are referred to as non-magnetic materials. Non-magnetic materials include substances like wood, plastic, and glass, which do not exhibit any magnetic properties.
The reason provided in this case is a correct explanation for the assertion, as it clarifies the distinction between magnetic and non-magnetic materials.

Q2: Assertion: Opposite pole of two magnets attract each other where as similar pole repel one another.
Reason: A freely suspended magnet always aligns in n-s direction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (b)
The assertion is correct. Opposite poles of magnets do attract each other due to the magnetic field's nature, while similar poles repel each other.
The reason is correct. A freely suspended magnet, when allowed to rotate without any external interference, will align itself in the north-south direction. This phenomenon is due to the Earth's magnetic field, and it helps in determining the geographical north-south directions.
However, the reason provided is not a direct explanation for the assertion. The two statements, though both correct, are not logically connected in terms of explanation.

Q3: Assertion: There are two poles of bar magnet only.
Reason: The magnet have north and south pole.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (b)
The assertion is incorrect. A bar magnet indeed has two poles, a north pole and a south pole. However, it's important to note that there are many types of magnets, and some may have more than two poles, depending on their configuration.
The reason is correct. A magnet always possesses a north pole and a south pole. This is a fundamental characteristic of magnets.
In this case, the assertion is the incorrect statement, but the reason is accurate.

Q4: Assertion: the process of making magnet from iron are artificial method
Reason: There are different shapes of magnet like bar magnet, horsehoe magnet cylindrical or ball ended magnet.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (b)
The assertion is correct. Making magnets from iron typically involves an artificial process. This process often includes rubbing the iron object with a magnet or using electric current to induce magnetism in the iron.
The reason is correct. Magnets come in various shapes, including bar magnets, horseshoe magnets, cylindrical magnets, and ball-ended magnets. These different shapes serve different purposes and are used in various applications.
Furthermore, the reason is a correct explanation for the assertion. The assertion states that making magnets from iron is an artificial process, and the reason explains the diversity of magnet shapes that can be artificially created.

Q5: Assertion: Magnets always have two poles, North and South.
Reason: The Earth itself acts as a huge magnet with a North and South pole.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (b)
It is true that magnets always have two poles and the Earth acts as a huge magnet with a North and South pole. However, the reason does not explain why magnets have two poles, as it's a property of magnets not because of the earth.

Q6: Assertion: Magnetic poles exist in pairs.
Reason: If a magnet is cut into pieces, each piece will have a North and a South pole.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
Magnetic poles exist in pairs, that is, they always have both a North and a South pole. If you cut a magnet in half, you don't get a separate North and South pole. Instead, each half will again have both a North and a South pole.

Q7: Assertion: Magnets can attract all types of metals.
Reason: All metals contain iron.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (d)
Magnets do not attract all types of metals. They only attract ferromagnetic materials like iron, nickel, and cobalt. Not all metals contain iron.

Q8: Assertion: Like poles of magnets repel each other.
Reason: Magnetic fields of like poles push against each other.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
Like poles of magnets (North-North or South-South) do repel each other. This occurs because the magnetic fields of like poles push against each other.

Q9: Assertion: The magnetic field is the strongest at the poles of a magnet.
Reason: The magnetic lines of force are most concentrated at the poles.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (d)
The magnetic field is indeed the strongest at the poles of a magnet. This is because the magnetic lines of force are most concentrated at the poles.