Physics Test | Class 9 Physics

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Class: 9th
Subject: Physics (SNC)
Chapter: 8 – Magnetism

Test Date: Current Date
Time Allowed: 60 minutes
Total Marks: 50
Paper Type: Objective + Subjective

Multiple Choice Questions (10×1 = 10 Marks)

1. When a pole is induced in the near end of an iron nail placed near the S-pole of a bar magnet, what pole is induced?
   (A) N-Pole
   (B) S-Pole
   (C) N-Pole is induced
   (D) Both Poles are induced
2. How does magnetic field strength change with distance?
   (A) Increases
   (B) Decreases
   (C) Becomes zero
   (D) None of these
3. What is the magnetic field near a magnet’s poles?
   (A) Weak
   (B) Strong
   (C) Uniform
   (D) Zero
4. What is the use of permanent magnets in magnetic resonance imaging (MRI) machines?
   (A) Conduction
   (B) Treat
   (C) Magnetize
   (D) None of these
5. What is the application of permanent magnets in wind turbines?
   (A) Generation
   (B) Transformation
   (C) Transmission
   (D) None of these
6. What is the application of permanent magnets in magnetic storage devices?
   (A) Store
   (B) Transform
   (C) Convert
   (D) None of these
7. What is the advantage of using an electromagnet?
   (A) Permanent
   (B) Temporary
   (C) Strong
   (D) Weak
8. What type of magnetism is exhibited by iron?
   (A) Diamagnetic
   (B) Ferromagnetic
   (C) Paramagnetic
   (D) None of these
9. What happens to a magnet when it is heated?
   (A) Magnetization
   (B) Demagnetization
   (C) Polarization
   (D) None of these
10. What is the method of demagnetizing a material by heating it above its Curie temperature?
    (A) Heating
    (B) Hammering
    (C) Magnetization
    (D) None of these

Short Answer Questions (15×2 = 30 Marks)

Answer the following questions briefly.

1. Name some uses of permanent magnets and electromagnets.

2. Two bar magnets are stored in a wooden box. Label the poles of the magnets and identify objects P and Q.

3. What happens when a magnet is brought close to iron filings?

4. List three non-magnetic materials.

5. What are the two poles of a magnet?

6. What happens when a magnet is cut into two pieces?

7. Write three properties of magnets.

8. What happens to an iron nail when it is placed in contact with a bar magnet?

9. What is a permanent magnet?

10. What type of magnet is made of iron?
11. What is the difference between a natural magnet and an artificial magnet?
12. What are some common uses of permanent magnets?
13. What is the advantage of using an electromagnet?
14. How can heating be used to demagnetize a material?
15. How can hammering be used to demagnetize a material?
    ____________________________________________________

Detailed Answer Questions (Answer any 2) (2×5 = 10 Marks)

1. What are magnetic field lines? Explain how magnetic field lines emerge from a magnet and how they interact with other magnets.
   Answer:

2. Compare and contrast the different methods of magnetization, including stroking (single touch, double touch) and using a solenoid.
   Answer:

3. How can you identify whether an object is a magnet or magnetic material?
   Answer:

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