Electromagnetism MCQ's 2
Here are MCQ's form Electromagnetism chapter 14 physics book 2 for the preparation of entry test of all engineering universies and Medical Colleges.
1.
The Lorentz force or a charged particle moving
in an electric flux F and magnetic filed B is given
a.
F = Fe +Fb
b.
F = Fe – Fb
c.
F = Fe/Fb
d.
F = fe X Fb
2.
The force experienced by an electron projected
in a magnetic field B with a velocity V is given by
a.
F = eVXB
b.
F = -e V X B
c.
F = e B X V
d.
Both b and c
3.
Charge to mass ratio (e/m) of a charged particle
is also called its
a.
Specific charge
b.
Specific force
c.
Gyro magnetic ratio
d.
Magneto mechanical ratio
4.
Which one of the following cannot be measure
with an avometer?
a.
Voltage (V)
b.
Inductance (H)
c.
Resistance (ohm)
d.
Current (A)
5.
Which one of the following particles projected
perpendicular to a uniform magnetic field with
the same velocity will be deflected least?
a.
Electron
b.
Proton
c.
Deuteron
d.
None of these
6.
A positively charged particle is moving perpendicular
to a uniform magnetic field the magnetic force makes the particle to move along
a.
An elliptical path
b.
A circular path
c.
A parabolic path
d.
None of these
7.
The working of all DC electric meters
(galvanometers, ammeters and voltmeters) depends upon
a.
Heating effect of current
b.
Chemical eff3ect of current
c.
Magnetic field of current
d.
Electromagnetic effect of current
8.
According to Faraday’s law of electromagnetic
induction
a.
Electric field is produced by time varying
magnetic flux
b.
Magnetic field is produced by time varying
electric flux
c.
Magnetic field is associated with a moving
charge
d.
None of the above
9.
A magnetic field
a.
Always exerts a force on a charged particle
b.
Never exerts a force on a charged particle
c.
Exerts a force on a charged particle if it is
moving across the magnetic lines of force
d.
Exerts a force on a charged particle if it is
moving along the magnetic lines of force
10.
Magnetic permeability is maximum for
a.
Diamagnetic substances
b.
Paramagnetic substances
c.
Ferromagnetic substances
d.
All of these
11.
The magnetic field used in a moving coil
galvanometer is
a.
Longitudinal
b.
Radial
c.
Transverse
d.
Non of these
12.
The galvanometer constant of a moving coil
galvanometer is given by
a.
K = BAN/C
b.
K = BN/Ca
c.
K = NAC/B
d.
K = C/BAN
13.
If the value of galvanometer constant k =C/BAN
is made small the galvanometer can be made
a.
Sensitive
b.
Accurate
c.
Stable
d.
None of these
14.
When a suitable small resistance is put in
parallel with the galvanometer coil, it is converted
a.
Voltmeter
b.
Avometer
c.
Ammmerter
d.
None of these
15.
A small parallel resistance (shunt) used to
convert a galvano0meter into an ammeter of suitable rang is given by
a.
Rs = lg/l + lg X Rg
b.
Rs = lg/l – lg X rg
c.
Rs = l + lg/lg X Rg
d.
Rs = lg/l-lg – Rs
16.
To increase the range of ammeter, the shunt
value should be
a.
Decreased
b.
Increased
c.
Kept constant and Rg should be increased
d.
None of these
17.
When a high resistance is connected in series
with the galvanometer coil, it is converted into
a.
Voltmeter
b.
Avometer
c.
Digital meter ammeter
d.
Ammeter
18.
To increase the measuring range of a voltmeter,
the series resistance should be
a.
Increased
b.
Decreased
c.
Kept constant and Rg should be increased
d.
None of these
19.
Flow of a current at right angled to the filed
per meter length of conductor will produce a
magnetic strength of
a.
1 Gauss
b.
1 Tesla
c.
1 joule
d.
Newton
20.
Magnetic flux is
a.
0.25 Wb
b.
0.25 T
c.
2 Wb
d.
2T
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