Free Online Tests Magnetism and Electromagnetism Test1

Thank you very much for taking test

Test your caliber

1. Tesla is a unit of _____.
field strength	inductance
flux density	flux

2. A permeable substance is one ______.
which is a good conductor	which is a bad conductor
which is a strong magnet	through which the magnetic lines of force can pass very easily

3. The materials having low retentivity are suitable for making ______.
weak magnets	temporary magnets
permanent magnets	none of the above

4. A magnetic field exists around ______.
iron	copper
aluminium	moving charges

5. Ferrites are _____ materials.
paramagnetic	diamagnetic
ferromagnetic	none of the above

6. Air gap has_______eluctance as compared to iron or steel path.
little	lower
higher	zero

7. The direction of magnetic lines of force is _______.
from south pole to north pole	from north pole to south pole
from one end of the magnet to another	none of the above

8. Which of the following is a vector quantity ?
Relative permeability	Magnetic field intensity
Flux density	Magnetic potential

9. The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is _____.
proportional to 7	proportional to X
proportional to distance between the conductors	inversely proportional to I

10. A material which is slightly repelled by a magnetic field is known as ______.
ferromagnetic material	diamagnetic material
paramag>etic material	conducting material

11. When an iron piece is placed in a magnetic field
the magnetic lines of force will bend away from their usual paths in order to go away from the piece	the magnetic lines of force will bend away from their usual paths in order to pass through the piece
the magnetic field will not be affected	the iron piece will break

12. Fleming's left hand rule is used to find
direction of magnetic field due to current carrying conductor	direction of flux in a solenoid
direction of force on a current carrying conductor in a magnetic field	polarity of a magnetic pole

13. The ratio of intensity of magnetisation to the magnetisation force is known as _____.
flux density	susceptibility
relative permeability	none of the above

14. Magnetising steel is normals difficult because ______.
it corrodes easily	it has high permeability
it has high specific gravity	it has low permeability

15. The left hand rule correlates to ______.
current, induced e.m.f. and direction of force on a conductor	magnetic field, electric field and direction of force on a conductor
self induction, mutual induction and direction of force on a conductor	current, magnetic field and direction of force on a conductor

16. The unit of relative permeability is _____.
henry/metre	henry
henry/sq. m	it is dimensionless

17. A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be ______.
zero	BLI
B2LI	BLI2

18. The force between two long parallel conductors is inversely proportional to _______.
radius of conductors	current in one conductor
product of current in two conductors	distance between the conductors

19. Materials subjected to rapid reversal of magnetism should have ______.
large area oiB-H loop	high permeability and low hysteresis loss
high coercivity and high retentivity	high coercivity and low density

20. Indicate which of the following material does not retain magnetism permanently.
Soft iron	Stainless steel
Hardened steel	None of the above