Magnetism

1. Magnetism
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
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

2. Magnetism
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
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

3. Magnetism
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
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

4. Magnetism
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
11.Which of the following is NOT a natural magnet?
[A] lodestone
[B] pyrrhotite
[C] columbite
[D] titanium
12.Which of the following is correct?
[A] The poles of a magnet always occur in pairs
[B] Like poles attract and unlike poles repel
[C] Both a and b
[D] None of the above
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

5. Magnetism
13.Which of the following is correct?
[A] Freely suspended magnet always align in north-south
direction
[B] Magnetic poles of a magnet are of equal strength
[C] Both a and b
[D] None of the above
14.Which of the following is NOT correct about the force of
interaction between two poles of a magnet, as per coulomb’s
law?
[A] directly proportional to the product of the pole strength
[B] directly proportional to the square of the distance r between
the poles
[C] Both a and b
[D] None of the above
15.What do we call an arrangement of two unlike poles of equal
strength separated by a small distance?
[A] Magnetic dipole
[B] Solenoid
[C] Toroid
[D] Electric dipole
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

6. Magnetism
16.Which of these is used to accelerate charged particles or ions
to high energies?
[A] Solenoid
[B] Cyclotron
[C] Electric motor
[D] Toroid
17.What is the magnetic field at any point in the open space
inside the toroid?
[A] zero
[B] one
[C] Depends on the current in the turns
[D] Depends on number of turns
18.What is the S.I. unit of magnetic dipole moment?
[A] joule/tesla
[B] joule/metre
[C] tesla/metre
[D] Newton/metre
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

7. Magnetism
19.How can a moving coil galvanometer be converted into a
ammeter?
[A] by introducing shunt resistance in parallel
[B] by introducing shunt resistance in series
[C] by introducing large resistance in series
[D] None of the above
20.How can a moving coil galvanometer be converted into a
voltmeter?
[A] by introducing shunt resistance in parallel
[B] by introducing shunt resistance in series
[C] by introducing large resistance in series
[D] None of the above
21.What happens to a bar magnet of dipole moment (m) is
placed in a uniform magnetic field (B)?
[A] the force on the bar magnet is zero
[B] the torque on the bar magnet is m × B
[C] Both a and b
[D] None of the above
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

8. Magnetism
22.Which of the following is a suitable material for making a
permanent magnet?
[A] alnico
[B] cobalt steel
[C] ticonal
[D] All of the above
23.Which of the following properties of a material make it
suitable to become a permanent magnet?
[A] The material should have high retentivity
[B] The material should have low coercivity
[C] The material should have low permeability
[D] Both b and c
24.What do we call the material which gets strongly magnetised
when placed in an external magnetic field?
[A] Pyromagnetic
[B] Ferromagnetic
[C] Paramagnetic
[D] Diamagnetic
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

9. Magnetism
25.What is the susceptibility of a diamagnetic material?
[A] positive and small
[B] positive and large
[C] negative
[D] None
26.What are the lines joining places of zero declination known
as?
[A] Isoclinic
[B] Agonic
[C] Aclinic
[D] Isogonic
27.Which of the following quantities indicate the degree of
magnetization of a material in response to an applied magnetic
field?
[A] Intensity of magnetisation
[B] Magnetic permeability
[C] Magnetizing force
[D] Magnetic susceptibility
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

10. Magnetism
28.What is the relationship between the magnetisation of a
paramagnetic material and the absolute temperature?
[A] they are directly proportional to each other
[B] they are inversely proportional to each other
[C] they are independent of each other
[D] None
29.What is the Meissner effect?
[A] perfect paramagnetism in superconductors
[B] perfect ferromagnetism in superconductors
[C] perfect diamagnetism in insulators
[D] perfect diamagnetism in superconductors
30.Which of the following is correct?
[A] Soft iron is a hard ferromagnetic material
[B] Alnico is a soft ferromagnetic material
[C] At high enough temperature, a ferromagnet becomes a
paramagnet
[D] All of the above
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com