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- 1. Multiple Choice
What is that instrument which can detect the presence of electric current in a circuit?
galvanometer
motor
generator
none of above
- 2. Multiple Choice
The direction of magnetic field developed around a current -carrying conductor can be easily found by the use of
right hand thumb rule
left hand thumb rule
Fleming's left hand rule
Fleming's right hand rule
- 3. Multiple Choice
The strength of magnetic field around a current - carrying straight conductor
is same every where around the conductor
is directly proportional to the square of distance of a point from the conductor
is directly proportional to the current flowing in the conductor
is inversely proportional to the current
- 4. Multiple Choice
What should be the core of an electromagnet?
soft iron
hard iron
rusted iron
none of above
- 5. Multiple Choice
The strength of a magnetic field inside a long current-carrying straight solenoid coil is
more at the ends than at the centre
minimum in the middle
same at all points
found to increase from one end to the other
- 6. Multiple Choice
A magnetic field existing around a magnet can be represented by magnetic field lines. Magnetic field lines always form
open loops
closed loops
straight lines
both closed loops and straight lines
- 7. Multiple Choice
A vertical wire carries a current straight down. To the east of this wire , the magnetic field points:
southwards
downwards
eastwards
northwards
- 8. Multiple Choice
If a charged particle does not experience any force in a magnetic field, then..
A) it is stationary
B) it moves in the direction parallel to magnetic field
both A and B
it moves perpendicular to the field
- 9. Multiple Choice
The function of commutator or slip ring is to
increase the current flowing through the coil
change the direction of current through coil
decrease the current flowing through the coil
change the direction of magnetic field
- 10. Multiple Choice
A beam of alpha particles enters a chamber moving along the magnetic field. The force acting on them is
maximum and perpendicular to the magnetic field
maximum and along the magnetic field
minimum and perpendicular to the magnetic field
zero
- 11. Multiple Choice
Induced current found to be highest when coil moves
at an angle of 45 degree
at angle of 20 degree
parallel to magnetic field
right angle to magnetic field
- 12. Multiple Choice
when current flows clockwise in a loop the polarity of its face is
east
south
west
north
- 13. Multiple Choice
Magnets having temporary magnetism are called
electromagnets
bar magnet
circular magnet
horse shoe magnets
- 14. Multiple Choice
Direction of induced current produced by motion of a conductor in a magnetic field is given by
Fleming's right hand rule
Fleming's left hand rule
Lenz's rule
Faraday's rule
- 15. Multiple Choice
An electron enters a magnetic field at right angle to the MF moving from west to east. The direction of force acting on the electron will be
to the right
to the left
out of the page
into the page
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