Physics GK 22 - Magnetism

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1).
Which of the following is correct about magnetic field?
2).
Which is the direction of magnetic field inside a magnet?
3).
Which of the following is correct about magnetic field lines?
4).
What is the relationship between the magnetic field in the straight conductor and the distance from it?
5).
What is the direction of force as per Fleming’s left hand rule?
6).
Which of the following is correct about an electric motor?
7).
Which of the following phenomenon is the basis of an electric generator?
8).
What is the net magnetic field in a solenoid?
9).
What is the SI unit of magnetic flux?
10).
Which of the following is correct about Permeability of free space?
11).
Which of the following is NOT a natural magnet?
12).
Which of the following is correct?
13).
Which of the following is correct?
14).
Which of the following is NOT correct about the force of interaction between two poles of a magnet, as per coulomb's law?
15).
What do we call an arrangement of two unlike poles of equal strength separated by a small distance?
16).
Which of these is used to accelerate charged particles or ions to high energies?
17).
What is the magnetic field at any point in the open space inside the toroid?
18).
What is the S.I. unit of magnetic dipole moment?
19).
How can a moving coil galvanometer be converted into a ammeter?
20).
How can a moving coil galvanometer be converted into a voltmeter?
21).
What happens to a bar magnet of dipole moment (m) is placed in a uniform magnetic field (B)?
22).
Which of the following is a suitable material for making a permanent magnet?
23).
Which of the following properties of a material make it suitable to become a permanent magnet?
24).
What do we call the material which gets strongly magnetised when placed in an external magnetic field?
25).
What is the susceptibility of a diamagnetic material?
26).
What are the lines joining places of zero declination known as?
27).
Which of the following quantities indicate the degree of magnetization of a material in response to an applied magnetic field?
28).
What is the relationship between the magnetisation of a paramagnetic material and the absolute temperature?
29).
What is the Meissner effect?
30).
Which of the following is correct?
1. Which of the following is correct about magnetic field?
[A] Magnetic field has magnitude but no direction
[B] Magnetic field has both magnitude and direction
[C] Magnetic field may or may not have direction
[D] None of the above
2. Which is the direction of magnetic field inside a magnet?
[A] from south pole to north pole
[B] from north pole to south pole
[C] from north pole till centre of the magnet
[D] None of the above
3. Which of the following is correct about magnetic field lines?
[A] Magnetic field lines are closed curves
[B] Degree of closeness of the field lines shows the strength of the magnetic field
[C] Both a and b
[D] None of the above
4. What is the relationship between the magnetic field in the straight conductor and the distance from it?
[A] magnetic field decreases as the distance increases
[B] magnetic field increases as the distance increases
[C] magnetic field is independent of the distance
[D] None of the above
5. What is the direction of force as per Fleming’s left hand rule?
[A] parallel to the direction of magnetic field and perpendicular to the direction of current
[B] parallel to the direction of magnetic field and current
[C] perpendicular to the direction of magnetic field and current
[D] perpendicular to the direction of magnetic field and at 45° to the direction of current
6. Which of the following is correct about an electric motor?
[A] It converts potential energy to chemical energy
[B] It converts electrical energy to mechanical energy
[C] It converts mechanical energy to electrical energy
[D] None of the above
7. Which of the following phenomenon is the basis of an electric generator?
[A] Electromagnetic Induction
[B] Ferroelectric effect
[C] Telluric currents
[D] Electroluminescence
8. What is the net magnetic field in a solenoid?
[A] product of the fields due to all the turns
[B] equal to the field due to the largest turn
[C] vector sum of the fields due to all the turns
[D] arithmetic mean of the fields due to all the turns
9. What is the SI unit of magnetic flux?
[A] teslas
[B] maxwell
[C] weber
[D] Newton
10. Which of the following is correct about Permeability of free space?
[A] It is a scalar quantity
[B] Its S.I unit is T m A-1
[C] Both a and b
[D] None of the above
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