Which of the following actions can cause a magnet to lose its magnetic properties? 1. Heating 2. Hammering 3. Dropping from a height 4. Storing in a wooden box Select the correct answer using the code given below:

Correct Option The correct option is (a) 1, 2 and 3 only. Explanation A permanent magnet possesses magnetic properties due to the orderly alignment of its magnetic domains (microscopic regions where atomic magnetic moments are aligned in the same direction). Any external influence that provides enough energy to randomize or disrupt this alignment results in the loss of magnetism, a process known as demagnetization. Statement-wise Analysis - Statement 1 is Correct: Heating increases the kinetic energy of the atoms within the magnet. This thermal agitation vibrates the atoms and disrupts the alignment of the magnetic domains. If a magnet is heated above a specific temperature called the Curie temperature, it loses its ferromagnetic properties entirely and becomes paramagnetic. - Statement 2 is Correct: Hammering delivers a sharp mechanical shock to the material. This physical impact forces the magnetic domains out of their aligned positions, causing them to become randomized, which weakens or destroys the magnetism. - Statement 3 is Correct: Dropping from a height creates a sudden impact upon landing. Similar to hammering, this mechanical shock disturbs the orderly arrangement of the magnetic domains, leading to a loss of magnetic strength. - Statement 4 is Incorrect: Storing in a wooden box does not cause demagnetization. Wood is a non-magnetic material and does not interact with the magnetic field in a way that disrupts domain alignment. In fact, magnets are often stored in non-magnetic containers (with soft iron keepers) to protect them. Key Takeaway Demagnetization occurs when the uniform alignment of magnetic domains is destroyed by external energy, primarily through thermal agitation (heating) or mechanical shock (hammering or dropping).

Which of the following actions can cause a… - NCERT Class 6 Science MCQ

NCERT Class 6 Science — Chapter 1: Fun with magnets

mcqmedium

Which of the following actions can cause a magnet to lose its magnetic properties?

Heating
Hammering
Dropping from a height
Storing in a wooden box

Select the correct answer using the code given below:

NCERT textbook question

From NCERT Science - class 6 · Page 132

Options

A1, 2 and 3 only
B2, 3 and 4 only
C1 and 4 only
D1, 2, 3 and 4

Did you get this right?

Solution

Correct Option

The correct option is (a) 1, 2 and 3 only.

Explanation

A permanent magnet possesses magnetic properties due to the orderly alignment of its magnetic domains (microscopic regions where atomic magnetic moments are aligned in the same direction). Any external influence that provides enough energy to randomize or disrupt this alignment results in the loss of magnetism, a process known as demagnetization.

Statement-wise Analysis

Statement 1 is Correct: Heating increases the kinetic energy of the atoms within the magnet. This thermal agitation vibrates the atoms and disrupts the alignment of the magnetic domains. If a magnet is heated above a specific temperature called the Curie temperature, it loses its ferromagnetic properties entirely and becomes paramagnetic.
Statement 2 is Correct: Hammering delivers a sharp mechanical shock to the material. This physical impact forces the magnetic domains out of their aligned positions, causing them to become randomized, which weakens or destroys the magnetism.
Statement 3 is Correct: Dropping from a height creates a sudden impact upon landing. Similar to hammering, this mechanical shock disturbs the orderly arrangement of the magnetic domains, leading to a loss of magnetic strength.
Statement 4 is Incorrect: Storing in a wooden box does not cause demagnetization. Wood is a non-magnetic material and does not interact with the magnetic field in a way that disrupts domain alignment. In fact, magnets are often stored in non-magnetic containers (with soft iron keepers) to protect them.

Key Takeaway

Demagnetization occurs when the uniform alignment of magnetic domains is destroyed by external energy, primarily through thermal agitation (heating) or mechanical shock (hammering or dropping).

Your note

More from Chapter 1: Fun with magnets

Which of the following principles explains the directional alignment of a magnetic compass needle?

medium

With reference to the properties of magnets, consider the following statements: 1. Magnetic influence cannot pass through a thin sheet of paper. 2. A magnet tends to lose its properties if kept without magnetic keepers for a long time. 3. A freely suspended magnet aligns in the North-South direction in the absence of other magnets. Which of the statements given above are correct?

hard

Consider the following statements: 1. Soil is completely free of any magnetic particles across all geographical regions. 2. A magnet can be used to separate iron filings from soil. 3. The separation of iron from soil is possible due to the difference in magnetic properties. Which of the statements given above is/are correct?

medium

For a steel needle to function as a compass when floated on water, which of the following is a necessary prerequisite?

medium

Which of the following statements correctly describes the properties of 'Magnetite'?

easy

Keep practising Chapter 1: Fun with magnets

Work through every question from this NCERT chapter.

Browse all NCERT Class 6 Science chapters