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Class 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 6 (25 MCQs)

Quiz Instructions

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1. What are the components of the electromagnets?

Correct Answer: C) Battery, copper wire and iron nail.

2. For making electromagnets, soft iron is preferred over steel as it has high permeability and low retentivity

Correct Answer: A) True.

3. What type of magnet that can turned on and off?

Correct Answer: A) Electromagnet.

4. The primary origin(s) of magnetism lies in(a) Pauli exclusion principle.(b) polar nature of molecules.(c) intrinsic spin of electron.(d) None of these.Explaination:The primary origin of magnetism lies in the fact that the electrons are revolving and spinning about the nucleus of an atom.

Correct Answer: B) B.

5. Magnetic field lines form continuous closed loops

Correct Answer: A) Magnet is always a dipole.

6. The correct expression for the magnetic filed at a pint P on the axial point of a circular coil is

Correct Answer: A) $B=\\frac{\mu_oIR^2}{2\left(x^2+R^2\right)^{\frac{3}{2}}}$.

7. In a ..... a spinning turbine moves magnets which generates an electric current.

Correct Answer: B) Generator.

8. What is the role of domain walls in the magnetization process of ferromagnetic materials?

Correct Answer: C) Domain walls are boundaries between magnetic domains where the magnetization direction changes.

9. How does the shape of a magnet affect its magnetic field?

Correct Answer: A) The shape of a magnet affects its magnetic field by influencing the distribution and strength of the magnetic field lines.

10. The Time period of freely suspended bar magnet is independent of

Correct Answer: C) Length of the suspension.

11. A magnet of length 2d and pole strength m is equally divided into two parts perpendicular to its length. What is the magnetic moment of each part?

Correct Answer: B) One-fourth of the total magnetic moment.

12. The plates of a parallel-plate capacitor are 2.50mm apart, and each carries a charge of magnitude 80.0nC. The plates are in vacuum. The electric field between the plates has a magnitude of 4.00x10$^{6}$V/m. What is the potential difference between the plates?

Correct Answer: D) 1.00x10$^{4}$V.

13. At magnetic poles, the angle of dip is

Correct Answer: C) 90$^\circ$.

14. The value of the magnetic susceptibility for a super-conductors is:-

Correct Answer: D) -1.

15. In terms of magnetic properties due to electrons, neon (A=10) may be described as .....

Correct Answer: A) Diamagnetic.

16. If a magnetic substance is kept in a magnetic field, then which of the following substance moves out of the magnetic field?

Correct Answer: A) Diamagnetic substance.

17. What is the property of a material that allows it to create a permanent magnet?

Correct Answer: B) Ferromagnetism.

18. This type of electricity is known as current electricity.

Correct Answer: A) Human Harnessed Electricity.

19. Where is the force of attraction the strongest on a magnet?

Correct Answer: A) At the poles.

20. Substances that retain their ferromagnetic property for long period of time are called

Correct Answer: B) Permanent magnet.

21. A superconductor exhibits perfect diamagnetism.

Correct Answer: A) True.

22. In a moving coil galvanometer, the radial magnetic field will always exert a maximum torque on the coil. In which orientation will the coil have the maximum torque?

Correct Answer: A) Magnetic field is parallel to the plane of the coil.

23. A magnetic needle is kept in a non uniform magnetic field experiences

Correct Answer: A) A force as well as torque.

24. What are some common applications of magnetic materials?

Correct Answer: C) Common applications of magnetic materials include electric motors, transformers, magnetic storage devices, MRI machines, and magnetic sensors.

25. A generator is a device which converts electrical energy into mechanical energy.

Correct Answer: B) False.

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