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Online Tests
Physics ECAT Pre Engineering Chapter 14 Electromagnetism Online Test MCQs With Answers
Question # 1
Which is modified form of galvanometer
Choose an answer
potentiometer
battery
voltmeter
slide wire bridge
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Question # 2
To convert galvanometer into ammeter we connect
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small resistance in parallel with galvanometer
small resistance in series with galvanometer
high resistance in series with galvanometer
high resistance in parallel with galvanometer
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Question # 3
A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m
2
The force on the wire is
Choose an answer
5N
4N
1.5N
6N
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Question # 4
How many number of anodes used in electron gun
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one
two
three
six
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Question # 5
If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is
Choose an answer
F = B
2
F = 0
F = B
F = B/2
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Question # 6
A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is
Choose an answer
minimum
maximum
zero
none of these
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Question # 7
Flurescent screen is a screen where visible spot
Choose an answer
vanishes
is made
becomes small and large
none of these
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Question # 8
The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon
Choose an answer
Heating effect of current
Chemical effect of current
Magnetic effect of current
Electromagnetic effect of current
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Question # 9
Centripetal force for electron is given by
Choose an answer
mv
2
/ r
mv / r
2
mv
2
/ r
mr
2
/ v
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Question # 10
Magnetic flux and flux density are related by
Choose an answer
Flux density = flux x area
Flux density = flux / area
Flux density = flux - area
None of these
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Question # 11
Magnetic lines of force:
Choose an answer
Cannot intersect at all
Intersect at infinity
Intersect within magnet
Intersect at Neutral Point
None of these
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Question # 12
Electron gun consist of
Choose an answer
three anodes
heating cathode
three anodes
three anodes , heating cathode, grid
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