question_answer 1)
Coulomb's law is true for
A)
atomic distances \[(={{10}^{-11}}m)\] done
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B)
nuclear distances \[(={{10}^{-15}}m)\] done
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C)
charged as well as uncharged particles done
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D)
all the distances done
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question_answer 2)
Electric flux at a point in an electric field is
A)
positive done
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B)
negative done
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C)
zero done
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D)
none of these done
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question_answer 3)
As the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity
A)
increases done
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B)
decreases done
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C)
remains constant done
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D)
may increase or decrease depending on the actual temperature. done
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question_answer 4)
The unit of capacitance of a capacitor is
A)
joule done
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B)
henry done
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C)
farad done
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D)
ampere done
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question_answer 5)
Consider the following two statements. [A] Kirchoff's junction law follows from conservation of charge. [B] Kirchoff's loop law follows from conservative nature of electric field.
A)
Both A and B are correct done
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B)
A is correct but B is wrong done
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C)
B is correct but A is wrong done
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D)
Both A and B are wrong done
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question_answer 6)
The unit of specific resistance is
A)
\[\Omega \,{{m}^{-1}}\] done
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B)
\[\Omega \,{{m}^{-1}}\] done
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C)
\[\Omega \,m\] done
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D)
\[2.5\,\Omega \,m\] done
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question_answer 7)
The example of non-ohmic resistance is
A)
diode done
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B)
copper wire done
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C)
filament lamp done
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D)
carbon resistor done
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question_answer 8)
Kirchoff's first law, Le., S i = 0 at a junction, deals with the conservation of
A)
charge done
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B)
energy done
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C)
momentum done
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D)
angular momentum done
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question_answer 9)
One Kilowatt hour is equal to
A)
\[36\times {{10}^{5}}\,joule\] done
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B)
\[36\times {{10}^{3}}\,joule\] done
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C)
\[{{10}^{3}}\,joule\] done
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D)
\[{{10}^{5}}\,joule\] done
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question_answer 10)
The capacitance between points P and Q in circuit shown in fig is
A)
\[1\mu F\] done
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B)
\[1.5\mu F\] done
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C)
\[9\mu F\] done
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D)
\[6.75\mu F\] done
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question_answer 11)
Specific resistance of a conductor depends upon:
A)
composition of the conductor done
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B)
length of the conductor done
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C)
area of cross-section of the conductor done
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D)
resistance of the conductor done
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question_answer 12)
With increase in temperature, the resistance of copper:
A)
decreases done
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B)
increases done
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C)
becomes zero done
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D)
remains constant done
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question_answer 13)
Specific resistance of a substance is measured in:
A)
ohm/m done
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B)
m/ohm done
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C)
mho/m done
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D)
mho done
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question_answer 14)
One Kilowatt hour of electrical energy is the same as
A)
\[36\times 105\,\,Watts\] done
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B)
\[36\times 105\,\,ergs\] done
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C)
\[36\times 105\,\,Joules\] done
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D)
\[36\times 105\,\,B.T.V\] done
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question_answer 15)
Krichoffs current laws is applicable to only:
A)
closed loops in a network done
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B)
electronic circuits done
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C)
junctions in a network done
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D)
electric circuits done
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question_answer 16)
Filaments of electric bulbs are usually made of:
A)
nichrome done
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B)
carbon done
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C)
tungsten done
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D)
copper done
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question_answer 17)
Ohm's law is not applicable to:
A)
D. c. circuits done
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B)
High currents done
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C)
Small resistors done
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D)
Semiconductors done
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question_answer 18)
The element of electric heater is made of:
A)
copper done
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B)
carbon done
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C)
steel done
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D)
nichrome done
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question_answer 19)
In the SI system of units, the unit of force is:
A)
kg wt done
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B)
newton done
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C)
joule done
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D)
N-m done
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question_answer 20)
A light dependent resistors is basically a:
A)
power resistor done
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B)
non-metallic resistor done
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C)
carbon resistor done
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D)
variable resistor done
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question_answer 21)
In MKS system one Kilowatt is equal to
A)
1.36 HP done
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B)
1.34 HP done
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C)
1.5HP done
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D)
1.6HP done
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question_answer 22)
Voltage dependent resistors are used as:
A)
current stabilizers done
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B)
as heating elements done
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C)
for inductive circuits done
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D)
to suppress surges done
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question_answer 23)
In which of the following the resistance decreases with rise in temperature?
A)
LDR done
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B)
NTC thermistors done
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C)
Nichrome conductors done
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D)
ACSR conductors done
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question_answer 24)
An uncharged metal ball is placed in the uniform electric field of a plane capacitor. Which of them correctly represents the field lines on the ball?
A)
B)
C)
D)
None of the above done
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question_answer 25)
There is a point charge +q inside a hollow sphere and a point charge -q just outside its surface. The total flux passing through the sphere
A)
\[\frac{-q}{{{\in }_{0}}}\] done
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B)
\[\frac{q}{{{\in }_{0}}}\] done
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C)
\[\frac{2q}{{{\in }_{0}}}\] done
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D)
zero. done
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question_answer 26)
Figures below show regular hexagons, with charges at the vertices, hi which of the following cases the electric field at the centre is not zero. (1)
(2)
(3)
(4)
A)
1 done
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B)
2 done
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C)
3 done
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D)
4 done
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question_answer 27)
For a given surface the Gauss's law is stated as \[\oint{\overrightarrow{E}}.d\overrightarrow{A}=0\] From this we can conclude that
A)
E is necessarily zero on the surface done
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B)
E is perpendicular to the surface at every point done
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C)
The total flux through the surface is zero done
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D)
The flux is only going out of the surface done
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question_answer 28)
The electric field due to a uniformly charged sphere of radius R as a function of the distance from its centre is represented graphically by
A)
electric field is zero but potential is not zero done
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B)
electric field is not zero but potential is zero done
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C)
neither electric field nor potential is zero done
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D)
None of these done
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question_answer 29)
Two charges are at a distance d apart. If a copper plate (conducting medium) of thickness \[\frac{d}{2}\]is placed between them, the effective force will be
A)
2F done
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B)
F/2 done
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C)
0 done
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D)
\[\sqrt{2F}\] done
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question_answer 30)
Electric potential at any point is \[V=-5x+3y+\sqrt{15z},\] then the magnitude of the electric field is
A)
\[3\sqrt{2}\] done
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B)
\[4\sqrt{2}\] done
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C)
\[5\sqrt{2}\] done
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D)
\[7\] done
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question_answer 31)
The RMS value of the voltage u(t} = 3 + 4cos (3t is
A)
\[\sqrt{17}V\] done
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B)
\[5V\] done
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C)
\[7V\] done
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D)
\[(3+2\sqrt{2})\,\,V\] done
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question_answer 32)
If E is the electric field intensity then \[\Delta .(\Delta \times E)\] is equal to
A)
\[E\] done
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B)
\[|\overrightarrow{E}|\] done
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C)
null vector done
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D)
zero done
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question_answer 33)
A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of the electric field intensity, E, at a distance r (0 < r < R) inside the sphere?
A)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{Qr}{{{R}^{3}}}\] done
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B)
\[\frac{3}{4\pi {{\varepsilon }_{0}}}\frac{Qr}{{{R}^{3}}}\] done
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C)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{Q}{{{r}^{2}}}\] done
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D)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{QR}{{{r}^{3}}}\] done
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question_answer 34)
The number of chords in the graph of the given circuit will be
A)
3 done
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B)
4 done
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C)
5 done
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D)
6 done
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question_answer 35)
The current through the\[2K\Omega \]resistance in the circuit shown is
A)
zero done
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B)
1 mA done
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C)
2 mA done
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D)
6 mA done
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question_answer 36)
Which of the following statements associated with capacitors is wrong?
A)
A capacitor resists an abrupt change in the voltage across it in a manner analogous to the way a spring resists abrupt change in the current flowing through it. done
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B)
A capacitor resists an abrupt change in the current flowing through it. done
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C)
It is impossible to change the voltage across capacitor ' by a finite amount in zero time, for this requires infinite current through the capacitor. done
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D)
A finite amount of energy can be stored in a capacitor even if the current through the capacitor is zero, such as when the voltage across it is a constant. done
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question_answer 37)
To a highly inductive circuit, a small capacitance is added in series. The angle between voltage and current will
A)
increase done
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B)
Decrease done
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C)
remain nearly the same done
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D)
become in determinant done
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question_answer 38)
The resistivity of the conductor depends on
A)
Area of the conductor. done
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B)
Length of the conductor. done
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C)
Type of material. done
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D)
None of these. done
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question_answer 39)
A capacitor carries a charge of \[0.1C\,\,at\,\,5\,\,V\]Its capacitance is
A)
0.02 F done
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B)
0.5 F done
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C)
0.05 F done
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D)
0.2 F done
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question_answer 40)
1 F is theoretically equal to
A)
1 ohm of resistance done
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B)
Ratio of 1 V to 1 C done
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C)
Ratio of 1 C to 1 V done
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D)
None of these done
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question_answer 41)
Which of the followings is/are active element?
A)
Voltage source done
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B)
Current source done
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C)
Both done
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D)
None of these. done
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question_answer 42)
Power dissipation in ideal inductor is
A)
Maximum done
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B)
Minimum done
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C)
Zero done
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D)
A finite value done
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question_answer 43)
Which of the following are the passive elements?
A)
Resistor done
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B)
Bulb done
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C)
Both done
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D)
None of these. done
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question_answer 44)
Internal resistance of ideal voltage source is
A)
Zero done
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B)
Infinite done
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C)
Finite done
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D)
100 ohms done
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question_answer 45)
Mesh analysis is applicable for
A)
Planar networks done
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B)
Non planar networks done
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C)
Both planar & non-planar networks. done
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D)
Neither planar nor non planar networks done
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question_answer 46)
KCL works on the principle of which of the following
A)
Law of conservation of charge done
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B)
Law of conservation of energy done
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C)
Both done
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D)
Nose of the above done
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question_answer 47)
Average power taken by the pure capacitor is
A)
Zero done
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B)
Minimum done
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C)
Maximum done
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D)
Any of the above done
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question_answer 48)
KVL works on the principle of
A)
Law of conservation of charge done
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B)
Law of conservation of energy done
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C)
Both done
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D)
None of the above done
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question_answer 49)
Super position theorem is not applicable for
A)
Current calculations done
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B)
Voltage calculations done
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C)
Power calculations done
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D)
None of the above done
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question_answer 50)
Internal resistance of ideal current source is
A)
Zero done
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B)
Infinite done
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C)
Finite done
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D)
100 ohms done
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