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question_answer1)
In a current carrying conductor the net charge is
A)
\[1.6\times {{10}^{-19}}\]coulomb done
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B)
\[6.25\times {{10}^{-18}}\]coulomb done
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C)
zero done
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D)
infinite done
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question_answer2)
When no current is passed through a conductor,
A)
the free electrons do not move done
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B)
the average speed of a free electron over a large period of time is not zero done
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C)
the average velocity of a free electron over a large period of time is zero done
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D)
the average of the velocities of all the free electrons at an instant is non zero done
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question_answer3)
A current passes through a wire of non-uniform cross section. Which of the following quantities are independent of the cross-section?
A)
The charge crossing done
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B)
Drift velocity done
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C)
Current density done
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D)
Free-electron density done
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question_answer4)
In the equation AB = C, A is the current density, C is the electric field, Then B is
A)
resistivity done
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B)
conductivity done
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C)
potential difference done
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D)
resistance done
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question_answer5)
The speed at which the current travels, in conductor, is nearly equal to
A)
\[3\times {{10}^{4}}m/s\] done
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B)
\[3\times {{10}^{5}}m/s\] done
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C)
\[4\times {{10}^{6}}m/s\] done
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D)
\[3\times {{10}^{8}}m/s\] done
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question_answer6)
When a potential difference V is applied across a conductor at a temperature T, the drift velocity of electrons is proportional to
A)
\[\sqrt{V}\] done
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B)
V done
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C)
\[\sqrt{T}\] done
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D)
T done
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question_answer7)
For which of the following dependence of drift velocity \[{{v}_{d}}\]on electric field E, is Ohm's law obeyed?
A)
\[{{v}_{d}}\propto {{E}^{2}}\] done
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B)
\[{{v}_{d}}={{E}^{1/2}}\] done
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C)
\[{{v}_{d}}\]= constant done
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D)
\[{{v}_{d}}=E\] done
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question_answer8)
The current density (number of free electrons per\[{{m}^{3}}\]) in metallic conductor is of the order of
A)
1022 done
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B)
1024 done
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C)
1026 done
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D)
1028 done
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question_answer9)
A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it
A)
increases, thermal velocity of the electron increases done
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B)
decreases, thermal velocity of the electron increases done
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C)
increases, thermal velocity of the electron decreases done
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D)
decreases, thermal velocity of the electron decreases done
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question_answer10)
The electric field intensity E, current density J and specific resistance k are related to each other through the relation
A)
E=J/k done
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B)
E=J k done
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C)
E=k/J done
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D)
k=J E done
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question_answer11)
The unit of specific resistance is
A)
\[\Omega \,\,{{m}^{-1}}\] done
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B)
\[{{\Omega }^{-1}}\,\,{{m}^{-1}}\] done
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C)
\[{{\Omega }^{-1}}\] done
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D)
\[2.5\Omega {{m}^{2}}\] done
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question_answer12)
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_answer13)
Constantan wire is used for making standard resistance, because it has
A)
high melting point done
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B)
low specific resistance done
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C)
high specific resistance done
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D)
negligible temperature coefficient of resistance done
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question_answer14)
At temperature \[0{}^\circ K\], the germanium behaves as a/an
A)
conductor done
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B)
insulator done
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C)
super?conductor done
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D)
ferromagnetic done
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question_answer15)
Which of the following is used for the formation of thermistor?
A)
Copper oxide done
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B)
Nickel oxide done
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C)
Iron oxide done
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D)
All of the above done
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question_answer16)
What is the suitable material for electric fuse?
A)
Cu done
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B)
Constantan done
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C)
Tin-lead alloy done
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D)
Nichrome done
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question_answer17)
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
A)
the resistance and the specific resistance, will both remain unchanged done
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B)
the resistance will be doubled and the specific resistance will be halved done
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C)
the resistance will be halved and the specific resistance will remain unchanged done
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D)
the resistance will be halved and the specific resistance will be doubled done
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question_answer18)
Appliances based on heating effect of current work on
A)
only a. c. done
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B)
only d. c. done
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C)
both a. c. and d. c. done
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D)
d) None of these done
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question_answer19)
In the series combination of two or more than two resistances
A)
the current through each resistance is same done
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B)
the voltage through each resistance is same done
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C)
neither current nor voltage through each resistance is same done
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D)
both current and voltage through each resistance are same. done
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question_answer20)
The energy of a charged capacitor resides in
A)
the electric field only done
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B)
the magnetic field only done
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C)
Both the electric and magnetic fields done
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D)
Neither in electric nor magnetic field done
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question_answer21)
The capacity of a spherical conductor is 1 pf then its diameter would be
A)
1.8 m done
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B)
\[1.8\times {{10}^{4}}m\] done
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C)
\[1.8\times {{10}^{3}}m\] done
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D)
\[1.8\times {{10}^{10}}m\] done
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question_answer22)
Check the correct relation
A)
Potential = Charge/Capacity done
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B)
Charge = Potential/Capacity done
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C)
Capacity = Potential \[\times \] Charge done
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D)
Potential = Capacity \[\times \] Charge done
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question_answer23)
Which of the following has negative temperature coefficient of resistance?
A)
Tungsten done
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B)
Carbon done
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C)
Mercury done
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D)
Dynamite done
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question_answer24)
The temperature coefficient of resistance of conductors is
A)
positive done
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B)
negative done
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C)
neutral done
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D)
None of these done
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question_answer25)
In a circuit containing two unequal resistors connected in parallel, then
A)
the current is same in both the resistors done
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B)
the current is larger in larger resistance done
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C)
the voltage drop is same across both the resistances done
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D)
the voltage drop is larger across larger resistances done
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question_answer26)
Which of the following is an ohmic conductor?
A)
Copper done
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B)
Silver done
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C)
Gold done
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D)
All of these done
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question_answer27)
Reciprocal of specific resistance is
A)
conductive resistance done
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B)
specific conductance done
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C)
specific reactance done
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D)
plate resistance done
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question_answer28)
The safe current for the fuse wire of radius r is I, then
A)
\[I\,\alpha \,{{r}^{1/2}}\] done
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B)
\[I\,\alpha \,r\] done
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C)
\[I\,\alpha \,{{r}^{3/2}}\] done
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D)
\[I\,\alpha \,{{r}^{2}}\] done
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question_answer29)
The resistance of a straight conductor does not depend upon its
A)
shape of cross-section done
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B)
temperature done
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C)
material done
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D)
length done
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question_answer30)
The specific resistance of all metals is most affected by
A)
temperature done
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B)
pressure done
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C)
degree of illumination done
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D)
charge carriers done
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question_answer31)
The element in an electric stove is made of
A)
copper done
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B)
nichrome done
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C)
platinum done
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D)
tungsten done
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question_answer32)
The example of non-ohmic resistance is
A)
copper wire done
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B)
nichrome wire done
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C)
diode done
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D)
tungsten wire done
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question_answer33)
The conductivity of a superconductor is
A)
infinite done
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B)
very large done
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C)
very small done
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D)
zero done
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question_answer34)
When the temperature of metallic conductor is increased, its resistance
A)
always decreases done
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B)
always increases done
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C)
may increase or decrease done
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D)
remains the same done
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question_answer35)
Electric current is a quantity of
A)
scalar done
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B)
vector done
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C)
Both [a] and [b] done
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D)
None of these done
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question_answer36)
The specific resistance of a wire depends upon
A)
its length done
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B)
its cross-sectional area done
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C)
its dimensions done
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D)
its material done
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question_answer37)
The temperature coefficient of resistance of some material is negative. The material is
A)
silicon done
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B)
aluminum done
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C)
arsenide done
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D)
germanium done
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question_answer38)
What is converted into heat when current is set-up through a conductor?
A)
Electric current done
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B)
Electric potential done
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C)
Electric energy done
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D)
None of these done
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question_answer39)
For which of the following substances the temperature coefficient of resistivity is positive?
A)
Carbon done
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B)
Germanium done
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C)
Cadmium done
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D)
Aluminium done
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question_answer40)
The total capacitance of two capacitors\[{{C}_{1}}\]and \[{{C}_{2}}\]connected in series will be
A)
less than smallest capacitor done
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B)
more than the highest capacitance done
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C)
equal to the highest capacitance done
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D)
equal to \[{{C}_{1}}+{{C}_{2}}\] done
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question_answer41)
Which of the following is an active component?
A)
Inductor done
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B)
Capacitor done
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C)
Resistor done
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D)
Diode done
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question_answer42)
What is The Basic Three Electrical Quantities?
A)
Resistance, Capacitance, Inductance done
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B)
Power, Voltage, Conductance done
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C)
Voltage, Current, Resistance (Impedance) done
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D)
Current, Reluctance, Inductance done
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question_answer43)
In case of Short Circuit, ____Current will flow in the Circuit.
A)
Zero done
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B)
Very Low done
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C)
Normal done
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D)
Infinite done
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question_answer44)
Siemens or Mho \[(\mho )\] is the unit of___?
A)
Conductance done
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B)
Admittance done
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C)
Both 1 & 2 done
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D)
None of the above done
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question_answer45)
Electric pressure is also called
A)
Resistance done
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B)
Power done
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C)
Voltage done
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D)
Energy done
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question_answer46)
The dielectric material used in variable capacitor is generally
A)
Mica done
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B)
Air done
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C)
Ceramic done
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D)
Electrolyte done
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question_answer47)
Power consumed in a pure inductive circuit is
A)
Zero done
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B)
Less done
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C)
High done
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D)
Infinity done
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question_answer48)
Frequency of direct current is
A)
Zero done
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B)
Unity done
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C)
(e) 50 Hz done
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D)
infinity done
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question_answer49)
Power factor of direct current is
A)
Zero done
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B)
Lagging done
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C)
Unity done
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D)
Leading done
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question_answer50)
The property of a conductor due to which it passes current is called
A)
Reluctance done
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B)
Conductance done
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C)
Admittance done
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D)
Inductance done
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