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Basic Electricity Quiz

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Basic Electricity Quiz

shape Introduction

Electricity is the flow of electrons from one place to another. Electrons can flow through any material but do so more easily in some than in others. How easily it flows is called resistance. The resistance of a material is measured in Ohms.
Conductors: electrons flow easily. Low resistance.
Semi-conductors: An electron can be made to flow under certain circumstances. Variable resistance according to the formulation and circuit conditions.
Insulator: electrons flow with great difficulty. High resistance.
Since electrons are very small, as a practical matter they are usually measured in very large numbers. A Coulomb is 6.24 x 1018 electrons. However, electricians are mostly interested in electrons in motion. The flow of electrons is called current and is measured in AMPS. One amp is equal to a flow of one coulomb per second through a wire.
Making electrons flow through a resistance requires an attractive force to pull them. This force, called Electro-Motive Force or EMF, is measured in volts. A Volt is a force required to push 1 Amp through 1 Ohm of resistance. As electrons flow through resistance, it performs a certain amount of work. It may be in the form of heat or a magnetic field or motion, but it does something. This work is called Power and is measured in Watts. One Watt is equal to the work performed by 1 Amp pushed by 1 Volt through a resistance.

shape Electricity

1. In a current carrying conductor the net charge is
    A. 1.6 x [latex]{10}^{-19}[/latex]coulomb A. 6.25 x [latex]{10}^{-18}[/latex]coulomb C. zero D. infinite

Answer: Option C
2. When no current is passed through a conductor,
    A. the free electrons do not move B. the average speed of a free electron over a large period of time is not zero C. the average velocity of a free electron over a large period of time is zero D. the average of the velocities of all the free electrons at an instant is non zero

Answer: Option D
3. A current passes through a wire of nonuniform cross- section. Which of the following quantities are independent of the cross-section?
    A. The charge crossing B. Drift velocity C. Current density D. Free-electron density

Answer: Option D
4. In the equation AB = C, A is the current density, C is the electric field, Then B is
    A. resistivity B. conductivity C. potential difference D. resistance

Answer: Option A
5. The speed at which the current travels, in conductor, is nearly equal to
    A. 3 × [latex]10^4[/latex]m/s B. 3 × [latex]10^5[/latex]m/s C. 4 × [latex]10^6[/latex]m/s D. 3 × [latex]10^8[/latex]m/s

Answer: Option D
6. When a potential difference V is applied across a conductor at a temperature T, the drift velocity of electrons is proportional to
    A. [latex]\sqrt{V}[/latex] B. V C. [latex]\sqrt{T}[/latex] D T

Answer: Option B
7. For which of the following dependence of drift velocity[latex] {v}_{d}[/latex] on electric field E, is Ohm’s law obeyed?
    A. [latex] {v}_{d}[/latex] α [latex] E^2[/latex] B. [latex] {v}_{d}[/latex] = [latex] E^1/2[/latex] C. [latex] {v}_{d}[/latex] = constant D. [latex] {v}_{d}[/latex] = E

Answer: Option D
8. The current density (number of free electrons per [latex]m^3[/latex]in metallic conductor is of the order of
    A. [latex]10^{22}[/latex] B. [latex]10^{24}[/latex] C. [latex]10^{26}[/latex] D. [latex]10^{28}[/latex]

Answer: Option D
9. 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 B. decreases, thermal velocity of the electron increases C. increases, thermal velocity of the electron decreases D. decreases, thermal velocity of the electron decreases

Answer: Option B
10. The electric field intensity E, current density J and specific resistance k are related to each other through the relation
    A. E = J/k B. E = J k C. E = k/J D. k = J E

Answer: Option B
1. The unit of specific resistance is
    A. Ω [latex]m^{-1}[/latex] B. [latex] Ω^{-1}[/latex] [latex]m^{-1}[/latex] C. [latex] Ω^{-1}[/latex] D. 2.5Ω [latex]Ω^{2}[/latex]

Answer: Option C
2. The example of non-ohmic resistance is
    A. diode B. copper wire C. filament lamp D. carbon resistor

Answer: Option A
3. Constantan wire is used for making standard resistance, because it has
    A. high melting point B. low specific resistance C. high specific resistance D. negligible temperature coefficient of resistance

Answer: Option D
4. At temperature 0°K, the germanium behaves as a/an
    A. conductor B. insulator C. super-conductor D. ferromagnetic

Answer: Option B
5. Which of the following is used for the formation of thermistor?
    A. Copper oxide B. Nickel oxide C. Iron oxide D. All of the above

Answer: Option D
6. What is the suitable material for electric fuse?
    A. Cu B. Constantan C. Tin-lead alloy D. Nichrome

Answer: Option C
7. 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 B. the resistance will be doubled and the specific resistance will be halved C. the resistance will be halved and the specific resistance will remain unchanged D. the resistance will be halved and the specific resistance will be doubled

Answer: Option C
8. Appliances based on heating effect of current work on
    A. only a.c. B. only d.c. C. both a.c. and d.c. D. None of these

Answer: Option C
9. In the series combination of two or more than two resistances
    A. the current through each resistance is same B. the voltage through each resistance is same C. neither current nor voltage through each resistance is same D. both current and voltage through each resistance are same.

Answer: Option A
10. The energy of a charged capacitor resides in
    A. the electric field only B. the magnetic field only C. Both the electric and magnetic fields D. Neither in electric nor magnetic field

Answer: Option C
1. The capacity of a spherical conductor is 1 mF then it's diameter would be
    A. 1.8 m B. 1.8 × [latex]10^4[/latex] C. 1.8 × [latex]10^3[/latex] D. 1.8 × [latex]10^{10}[/latex]

Answer: Option B
2. Check the correct relation
    A. Potential = Charge/Capacity B. Charge = Potential/Capacity C. Capacity = Potential × Charge D. Potential = Capacity × Charge

Answer: Option A
3. Which of the following has negative temperature coefficient of resistance?
    A. Tungsten B. Carbon C. Mercury D. Dynamite

Answer: Option B
4. The temperature coefficient of resistance of conductors is
    A. positive B. negative C. neutral D. None of these

Answer: Option A
5. In a circuit containing two unequal resistors connected in parallel, then
    A. the current is same in both the resistors B. the current is larger in larger resistance C. the voltage drop is same across both the resistances D. the voltage drop is larger across larger resistances

Answer: Option C
6. Which of the following is an ohmic conductor?
    A. Copper B. Silver C. Gold D. All of these

Answer: Option D
7. Reciprocal of specific resistance is
    A. conductive resistance B. specific conductance C. specific reactance D. plate resistance

Answer: Option B
8. The safe current for the fuse wire of radius r is I, then
    A. I α [latex]r^{1/2}[/latex] B. I α r C. I α [latex]r^{3/2}[/latex] D. I α [latex]r^2[/latex]

Answer: Option C
9. The resistance of a straight conductor does not depend upon its
    A. shape of cross–section B. temperature C. material D. length

Answer: Option A
10. The specific resistance of all metals is most affected by
    A. temperature B. pressure C. degree of illumination D. charge carriers

Answer: Option A
1.The element in an electric stove is made of
    A. copper B. nichrome C. platinum D. tungsten

Answer: Option B
2. The example of non–ohmic resistance is
    A. copper wire B. nichrome wire C. diode D. tungsten wire

Answer: Option C
3. The conductivity of a super conductor is
    A. infinite B. very large C. very small D. zero

Answer: Option A
4. When the temperature of metallic conductor is increased, its resistance
    A. always decreases B. always increases C. may increase or decrease D. remains the same

Answer: Option B
5. Electric current is a quantity of
    A. scalar B. vector C. Both (A) and (B) D. None of these

Answer: Option A
6. The specific resistance of a wire depends upon
    A. its length B. its cross–sectional area C. its dimensions D. its material

Answer: Option D
7. The temperature coefficient of resistance of some material is negative. The material is
    A. silicon B. aluminium C. arsenide D. germanium

Answer: Option D
8. What is converted into heat when current is set-up through a conductor?
    A. Electric current B. Electric potential C. Electric energy D. None of these

Answer: Option C
9. For which of the following substances the temperature coefficient of resistivity is positive?
    A. Carbon B. Germanium C. Cadmium D. Aluminium

Answer: Option D
10. The total capacitance of two capacitors [latex]{C}_{1}[/latex] and [latex]{C}_{2}[/latex] connected in series will be
    A. less than smallest capacitor B. more than the highest capacitance C. equal to the highest capacitance D. equal to [latex]{C}_{1}[/latex] + [latex]{C}_{2}[/latex]

Answer: Option A
1. Which of the following is an active component?
    A. Inductor B. Capacitor C. Resistor D. Diode

Answer: Option D
2. What is The Basic Three Electrical Quantities?
    A. Resistance, Capacitance, Inductance B. Power, Voltage, Conductance C. Voltage, Current, Resistance(Impedance) D. Current, Reluctance, Inductance

Answer: Option C
3. In case of Short Circuit,_______Current will flow in the Circuit.
    A. Zero B. Very Low C. Normal D. Infinite

Answer: Option D
4. Siemens or Mho(℧) is the unit of ____________?
    A. Conductance B. Admittance C. Both A & B D. None of the above

Answer: Option C
5. Electric pressure is also called
    A. Resistance B. Power C. Voltage D. Energy

Answer: Option C
6. The dielectric material used in variable capacitor is generally
    A. Mica B. Air C. Ceramic D. Electrolyte

Answer: Option B
7. Power consumed in a purely inductive circuit is
    A. Zero B. Less C. High D. Infinity

Answer: Option A
8. The frequency of direct current is
    A. Zero B. Unity C. 50 Hz D. infinity

Answer: Option A
9. The power factor of direct current is
    A. Zero B. Lagging C. Unity D. Leading

Answer: Option C
10. The property of a conductor due to which it passes current is called
    A. Reluctance B. Conductance C. Admittance D. Inductance

Answer: Option B
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