EE AND ECE IMPORTANT MCQ-ELECTRICITY AND MAGNETISM FUNDAMENTALS (PAT ONE)

l.     Who discovered the
relationship between magnetism and electricity that serves as the foundation
for the theory of electromagnetism?

A.  
Luigi Galvani

B.  
Hans Christian Oersted

C.  
Andre Ampere
D.   Charles Coulomb

2.  Who  demonstrated the theory of
electromagnetic  induction in  l83l?

A.  
Michael Faraday

B.  
Andre Ampere

C.   James Clerk Maxwell
D.   Charles Coulomb

3.  Who developed the
electromagnetic theory of light  in  l862?

A.   Heinrich Rudolf Hertz
B.   Wilhelm Rontgen

C.  
James Clerk Maxwell 

D.   Andre Ampere

4.      Who   discovered 
that   a  current-carrying  conductor 
would   move  
when  placed   in    a

magnetic
field?

A.  
Michael Faraday

B.  
Andre Ampere

C.   Hans Christian Oersted
D.   Gustav Robert Kirchhoff

5.      Who discovered the most
important electrical effects which is the
magnetic  effect?

A.  
Hans Christian Oersted

B.  
Sir Charles Wheatstone
C.   Georg Ohm
D.   James Clerk Maxwell


 6. Who demonstrated that there are magnetic effects around
every  current-carrying  conductor and that current-carrying
conductors can attract and repel
each other just like magnets?
A.  
Luigi Galvani
B.   Hans Christian Oersted
C.  
Charles Coulomb

D.  
Andre Ampere

7.      Who discovered
superconductivity in  1911?

A.  
Kamerlingh Onnes

B.  
Alex Muller

C.   Geory Bednorz
D.   Charles Coulomb

8.The magnitude of the
induced emf in a coil is directly proportional to the rate of change  of flux linkages. This is known
as

A.  
Joule’s Law

B.  
Faraday’s second law of
electromagnetic induction

C.  
Faraday’s first law of electromagnetic  induction
D.   Coulomb’s Law

9.  Whenever a flux inking a coil or current changes, an emf is induced in it. This is known    as

A.  
Joule’s Law
B.   Coulomb’s Law

C.  
Faraday’s first law of
electromagnetic induction

D.  
Faraday’s second law of electromagnetic induction

10. The force of attraction or repulsion between two
magnetic poles  is  directly
proportional  to their strengths.

A.  
Newton’s first law
B.   Faraday’s first law
of electromagnetic  induction

C.  
Coulomb’s first law

D.  
Coulomb’s second law


 ll. The force of
attraction or repulsion between two magnetic poles is inversely proportional 
to the square of the distance between them. This is known  as
A.  
Newton’s first law
B.   Faraday’s first law
of electromagnetic  induction
C.   Coulomb’s first law

D.  
Coulomb’s second law

l2.
Whenever a conductor cuts magnetic flux, an emf is induced in it. This is   known as

A.   Coulomb’s law
B.   Joule’s law

C.  
Faraday’s law

D.  
Ohm’s law

l3. A law that states that the polarity of the induced voltage
will oppose the change  in magnetic flux causing the induction.

A.  
Joule’s law
B.   Faraday’s law
C.   Coulomb’s law

D.  
Lenz’ law

 l4. A law that states that the current  in a
thermionic diode varies directly with the three-  halves power of anode voltage and inversely
with the square of the distance between the electrodes, provided operating
conditions are such that the current is limited
only by the space charge.
A.  
Hall’s law
B.   Joule’s law

C.  
Child’s law

D.  
Coulomb’s law

l5.
States   that   the  
ratio   of   the  
thermal   conductivity   is  
proportional   to   the absolute temperature
for all metals.

A.   Wien’s displacement law
B.   Hartleys law
C.   Hall’s law

D.  
Wiedemann Franz law


 l6. A law establishing the fact that the algebraic su of the rises and drops of the mmf
around    a  closed loop of a magnetic
circuit is equal to  zero.
A.  
Kirchhoff’s circuital law
B.   Maxwell’s circuital law

C.  
Ampere’s circuital law

D.   Coulomb’s circuital law

l7. The
net electrical charge in an isolated system remains constant. This is
known   as

A.   Law of conservation of charge

B.   Coulomb’s first law
C.  
Coulomb’s second law

D.  
Law of conservation of energy
l8.
Lenz’s law is the consequence of the law of conservation   of

A.   Energy

B.   Charge

C.  
Field lines

D.  
Momentum

19.
Lenz’ law states that the direction of the induced emf and hence   current

A.   Is determined by the
rate of current flux
B.  
Is found by the right hand rule
C.   Is found by the left hand
rule

D.  
Always opposes the cause
producing it

20.  If you hold the
conductor with right hand so that the stretched thumb points  in  the direction of the current, then
encircling fingers will give the direction of magnetic lines of force round the
conductor. This is known as
A.  
Left hand cork screw rule
B.   Right hand cork screw rule
C.  
Left hand rule

D.  
Right hand rule

 2l. If the right handed bottle-opener cork screw is assumed to be along the
conductor so as to advance in the
direction of current flow, the motion
of its handle will indicate  the  direction of magnetic flux produced around
the conductor. This is known  as
A.    Right hand rule
B.    
Left hand rule
C.    
Cork screw rule
D.    End rule

22.  If on looking at any one
end of a solenoid; the direction of current flow
is found to be clockwise then the end under
observation is a south pole. This is known  as

A.  
Right hand rule
B.   Left hand rule
C.   Cork screw rule

D.  
End Rule

23.  If the solenoid is gripped by the right hand with the
fingers pointing the direction of current
flow, the outstretched thumb will then point the north pole. This is known  as 

A.  Right hand rule 
B.  Helix rule 
C. End rule 
D.  Cork screw rule

24.  The process by which an
emf and hence current is generated
or induced in a conductor when   there  
is  
a   change   in   the  
magnetic   flux   linking  
the   conductor   is   called

A. Electromagnetic induction 
B.  Mutual induction 
C.  Faraday’s law 
D.  Electromagnetic interference

25.  The emf induced in a coil due to the change of its own
flux linked with it is   called 

A. 
Mutually induced emf 
B.  Dynamically induced emf 
C. Statically induced emf 
D. Self induced emf 
26.  The emf induced in a coil due to the changing  current of another  neighboring coil is   called 
         A. Mutually induced emf

B. Self induced emf

C. Statically induced emf

D. Dynamically induced emf
27.  When a conductor is stationary and the magnetic field is moving or changing the emf
induced is called

A.  Statically induced emf

B.  Mutually induced emf

C. Self induced emf

D.  Dynamically induced emf

28.  The magnetic potential in a magnetic circuit can be measured in terms  of

A. Mmf

B. Emf

C. Farad

D. Coulomb

29.  A substance that
attracts pieces iron

A. Conductor

B. Semiconductor

C.  Magnet

D. All of the above

30.  The phenomenon by which
a subtracts pieces of  iron

A.  Magnetism

B.  Electromagnetism

C. Naturalism

D.  Materialism

31.  Which of the following is a natural magnet?

A.  Steel

B.  Magnesia

C. Lodestone

D.  Soft iron

 32.  Define as that pole which when placed in air from
a similar and equal pole repels it with a force
of newtons

A.  North pole

B.  South pole

C. Unit pole

D.  Magnetic pole

33.  The point in a magnet where the intensity of magnetic lines of force is maximum
A. Magnetic pole

B.  South pole

C.  North pole

D.  Unit pole

34.  The straight line passing through the two poles of magnet is   called

A.  Real axis

B.  Cartesian axis

C. Magnetic axis

D.  Imaginary axis
35.  The  branch of Engineering  which 
deals  with the  magnetic 
effect  of electric  current  is known
as

A.  Magnetism

B.  Electromagnetism

C. Electrical engineering

D.  Electronics engineering

36.  The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called

A. Magnetic field

B.  Electric field

C.  Electromagnetic field

D.  Free Space Field

37.  The total number of
magnetic lines of force in a
magnetic field is called 
A. Magnetic flux

B.  Magnetic flux density

C.  Magnetic flux intensity

D.  Magnetic potential
 38.  The phenomenon by which
a magnetic substance becomes a magnet when it
is place near  a magnet

A.  Magnetic effect

B.  Magnetic phenomenon

C. Magnetic induction

D.  Electromagnetic induction

39.  Which of the following
magnetic materials can be easily
magnetized in both direction? 
A. Soft magnetic materials

B.  Hard magnetic materials

C.  High hysteresis loss materials

D.  Low hysteresis loss materials
40.  Which of the following
materials has permeability slightly less than that of free  space?

A.  Paramagnetic

B.  Non- magnetic

C. Ferromagnetic 
D. Diamagnetic

4l. Materials whose permeabilities are slightly greater than
that of free space 
A. Paramagnetic

B.  Non- magnetic

C.  Ferromagnetic

D.  Diamagnetic

42.  Materials that  have very high permeabilities (hundreds and
even thousands times of that of free
space)

A.  Paramagnetic

B.  Non- magnetic

C.  Ferromagnetic

D.  Diamagnetic

43.  The current of electric
circuit is analogous to which
quantity of a magnetic  circuit

A.  Mmf

B.  Flux

C.  Flux density

D.  Reluctivity
 44.  What is the diameter of an atom?
A. About 10^-10 m

B.  About
l0^-l0 cm

C.  About
l0^-l0 mm

D.  About
l0^-l0 µm

45.  Defined as a closed path
in which magnetic induction or flux  flows

A.  Electric circuit

B.  Magnetic circuit

C.  Electronic circuit

D.  Electromagnetic circuit
46.  The force which set ups
or tends to set up magnetic flux in a magnetic  circuit

A.  Dynamic force

B.  Electromotive force

C. 
Potential   difference
D. Magnetomotive
force

47.  Referred to as the
specific reluctance of a material

A.  Resistivity

B.  Reluctivity

C.  Conductivity

D.  Permeability

48.  The property of a
material which opposes the creation of magnetic flux in  it

A.  Resistance

B.  Reluctance

C.  Permeance

D.  Conductance
49.  It is the reciprocal of reluctance and implies the case of readiness with which magnetic 
flux is developed.

A.  Resistance

B. 
Conductance
C. Permeance

D.
Inductance
 50.  The ability of a material to conduct magnetic flux
through it.

A.  Permittivity

B.  Reluctivity

C. 
Conductivity
D. Permeability

      5l. The
ratio of the permeability of material
to the permiabiity of air or vacuum.

A.  Relative permeability

B.  Relative permittivity

C. Relative conductivity

D.  Relative reluctivity

52.  Permeance is analogous to
A. Conductance

B.  Reluctance

C.  Admittance

D.  Resistance

53.  The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known
as

A.  Retentivity

B.  Reluctivity

C.  Resistivity

D.  Conductivity

54.  The quantity of magnetism retained by a magnetic material
after withdrawal of the magnetizing force is called

A.  Leftover magnetism

B.  Hysteresis

C.  Residual magnetism

D.  Coercivity

55. The  amount 
of magnetizing  force 
to counter balance 
the residual magnetism of a magnetic
material is referred to as

A.  Reluctivity

B.  Susceptivity

C.  Coercivity

D.  Retentivity

 

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ELECTRONICS AND COMMUNICATION ENGINEERING IMPORTANT MCQ-ELECTRICITY AND MAGNETISM FUNDAMENTALS (PART TWO)
ELECTRICAL ENGINEERING IMPORTANT MCQ-SEMICONDUCTOR DIODE

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