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Online Tests
ECAT Pre General Science Physics Chapter 14 Electromagnetism Online Test MCQs With Answers
Question # 1
The SI unit of flux density is.
Choose an answer
Tesla
Weber
Gaun
Weber/meter
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Question # 2
The current is measured in
Choose an answer
volts
watt
ampere
ohm
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Question # 3
It is customary represent a current flowing towards the reader by a symbol
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(x)
(+)
(.)
(-)
(
รท)
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Question # 4
A current carrying conductor sets up its own:
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Electric field
Nuclear field
Magnetic field
Both (A) and (C)
All of these
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Question # 5
Which is modified form of galvanometer
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potentiometer
battery
voltmeter
slide wire bridge
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Question # 6
Which one of the following relations is correct?
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1 Wb-m
2
= Nm
-1
A
-1
1 tesla = 104 gausses
1 Wb-m
2
= 1 tesla
All of the above
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Question # 7
The field around a moving charge is called
Choose an answer
magnetic field
conservative field
non-conservative field
none of these
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Question # 8
NmA
-1
is commonly called:
Choose an answer
Weber
Apmere
Guass
Coulomb
None of these
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Question # 9
The most suitable material for permanent magnet is
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cobalt
iron
steel
alaminium
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Question # 10
Electron gun consist of
Choose an answer
three anodes
heating cathode
three anodes
three anodes , heating cathode, grid
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Question # 11
The force acting as one meter length of the conductor placed at right angle to the magnetic field, when one A current is passing through it, defines the
Choose an answer
magnetic flux
magnetic induction
magnetic field
self inductance
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Question # 12
The torque per unit twist of coil is called
Choose an answer
proportionality constant
gravitational constant
boltzman constant
coupling constant
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Question # 13
In order to make a voltmeter, high resistance is connected with galvanometer, in
Choose an answer
perpendicular
may be paralled or pendicular
series
none of these
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Question # 14
Magnetic flux passing through a element whose vector area makes an angle
0ยบ with lines of magnetic force is:
Choose an answer
BA
Cosัฒ
Zero
BA
BA sin
ัฒ
None of these
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Question # 15
The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by
Choose an answer
F=IB/L
F= L x B/I
F = IL x B
F = IL . B
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Question # 16
The direction of lines of force depends upon the direction of
Choose an answer
voltage
current
charges
none of these
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Question # 17
If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are
Choose an answer
n/AL
Al/n
nAL
nA/L
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Question # 18
Weber is a unit of
Choose an answer
magnetic flux
magnetic filed intensity
magnetic induction
magnetic flux density
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Question # 19
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 # 20
When an electron enters in a magnetic field right angle to its motion, the magnitude of its velocity will be
Choose an answer
changed
zero
unchanged
none of these
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Question # 21
Total number of turns on 0.15 m length solenoid is 300. the value of n is:
Choose an answer
Greater than 300
Smaller than 300
Equal to 300
Any of (A) or (B)
Any of (A) or(C)
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Question # 22
A resistance used in voltmeter is called
Choose an answer
shunt resistance
high resistance
low resistance
zero resistance
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Question # 23
Current is measured in
Choose an answer
volts
watt
ohm
ampere
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Question # 24
A magnetic force on an electron travelling with 10
8
ms
-1
parallel to a field of strength 1 Wb m
-2
is
Choose an answer
Zero
10
5
m
10
-10
N
10
8
N
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Question # 25
The magnetic field inside a solenoid can be increased by:
Choose an answer
Increasing n
Decreasing I
Increasing I
By using iron core within solenoid
All correct except (B)
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Question # 26
The CRO is used for displaying the waveform of a given
Choose an answer
current
voltage
both of them
none of them
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Question # 27
The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by
Choose an answer
F =q(v/B)
F=q
2
(v x B)
F=q(v x B)
F= vx B
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Question # 28
When charged particle is projected perpendicular to a uniform magnetic field its trajectory is
Choose an answer
circular
elliptical
cycloid
straight line
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Question # 29
The unit of flux density is also given by
Choose an answer
Weber/m
2
or Wb . m
-2
Weber/mor Wb . m
Weber/mor Wb . m
-1
Weber or Wb
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Question # 30
The permeability of free space is measured in:
Choose an answer
Wb/Am
Wb A/m
Am/Wb
m/Web A
None of these
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Question # 31
'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?
Choose an answer
0
1
0.5
-1
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