Basic Electrical and network MCQ's (Multiple choise Questions)

1. Electric potential is an____

A) Vector quantity
B) Tensor quantity
C) Scalar quantity
D) dimensionless quantity

ANSWER= (C) Scalar quantity
Explaination:- Electrical potential only has magnitude but no direction,thats why it is a scalar quantity.
Check Answer

2. What is responsible for the current to flow in a circuit?

A) Electron
B) Proton
C) Neutron
D) all of the above

ANSWER= (A) Electron
Explaination:- Electrons are responsible for current to flow in the circuit.Electrons are negtively charged and when the potential difference is applied these electrons flow through the circuit cause current to flow.the direction of curent is always opposite to electron flow.
Check Answer

 

3. The capacity of capacitor is NOT influenced by?

A) Plate thickness
B) Plate area
C) Plate sepration
D) nature of dielectric

ANSWER= (A) Plate thickness
Explaination:- The capacity of capacitor is NOT influenced by plate thickness because capacitance does not depand on the plate thickness.
Check Answer

 

4. The objective of earthing and grounding is?

A) To provide low resistance possible to the ground
B) To provide high resistance possible to the ground
C) both of the above
D) none of the above

ANSWER= (A) To provide low resistance possible to the ground
Explaination:- The purpose of earthing or grounding is To ptrovide low resistance possible to the ground.
Check Answer

5. Ampere hour is a unit of the

A) quantity of electricity
B) Strength of current
C) power
D) energy

ANSWER= (A) quantity of electricity
Explaination:- it is the quantity of electricty transferred by a current of one ampere in one second.
Check Answer

6. for domastic wiring purpose , how are circuit connected?

A) straight
B) parallel
C) serial
D) series

ANSWER= (B) parallel
Explaination:- in parallel wiring connection individual switching is possible. but in series connection switching one appliance will turnd off other devices as well.
Check Answer

 

7. A fuse protect electric circuit by which of the following?

A) overloading
B) currentsport
C) current uptake
D) none of the above

ANSWER= (A) overloading
Explaination:- the fuse works on the heating effact of current when current exceeds pre-determined value the fuse wire melt and break the circuit Fuse wire is made up of lead+tin.
Check Answer

 

8. which of the following is a measure of the flow of electric charge over time?

A) power
B) voltage
C) energy
D) current

ANSWER= (D) current
Explaination:- the rate of flow of charge over time is called current.
Check Answer

 

9. when three identical bulb of 60watt,200volt rating are connected in series to a 200volt supply the power drawn by them will be?

A) 150 watt
B) 10 watt
C) 20 watt
D) 600 watt

ANSWER= (C) 20 watt
Explaination:- By formula I^2R.
Check Answer

 

10. which is not the unit of electric current?

A) coulomb/sec
B) Farad-coulomb/sec
C) volt/ohm
D) ampere

ANSWER= (B) Farad-coulomb/sec
Explaination:- expect Farad-coulomb/sec all are the units of electric current.
Check Answer

 

11.resistivity of a wire depand upon its?

A) material
B) length
C) area of cross section
D) all of the above

ANSWER= (A) Material
Explaination:-resistivity of wire depand upon its material composition.
Check Answer

 

12.The superposition theorm is essentially based on the concept of ?

A) duality
B) linearity
C) reciprocity
D) non linearity

ANSWER= (B) linearity
Explaination:- amplifire is used to increase the magnitude of the signal basically it increase the streangth of weak signals.
Check Answer

 

13.A capacitor is basically ?

A) bilatweral and active component
B) non linear and bilateral component
C) linear and bilateral element
D) none of the above

ANSWER= (C) linear and bilateral element
Explaination:- capacitor is an linear and biletral component.
Check Answer

 

14.A good conductor shoud have ?

A) the resistivity must be high
B) the resistivity must be low
C) resistivity shoud be infinite
D) all of the above

ANSWER= (B) the resistivity must be low
Explaination:- resistivity of conductor must be low to reduce voltage drop and losses.
Check Answer

 

15.A source of voltage V maintains a current I in a circuit. the power input P to the circuit by the source is given by?

A) P=VI
B) P=V/I
C) P=I/V
D) P=1/IV

ANSWER= (A) P=VI
Explaination:- POWER: the rate of work done by an electric current is called power.it is denoted by P. the Si unit of power is watt.
Check Answer

 

16.A 500 W,220 V bulb is supplied with 110V . power consuption by the bulb will be ?

A) slightly less than 125 W
B) slightly greater than 125 W
C) 125 watt
D) 260 w

ANSWER= (A) slightly greater than 125 W

Check Answer

 

17.Resistance of a material always decrease if

A) temprature of the material is decreased
B) temprature of the material is increased
C) number of free electrons become more
D) none of the above

ANSWER= (c) number of free electrons become more
Explaination:- Resistance of a material always decrease if number of free electrons become more . if number of free electrons increased the reistivity will become decrease automatically.
Check Answer

 

18.A glass rod when rubbed with silk cloth is charged because ?

A) it takes in proton
B) its atom are removed
C) it gives away electrons
D) it gives away postive charge

ANSWER= (C) it gives away electrons

Check Answer

 

19.Resistance of carbon filament lamp will be ___ as the applied voltage increase ?

A) increase
B) decrease
C) remain same
D) none of the above

ANSWER= (B) decrease
Explaination:- Resistance of carbon filament lamp will be decreased as the applied voltage increase.
Check Answer

 

20.For testing the appliances,the wattage of the test lamp should be ?

A) High
B) Low
C) very low
D) zero

ANSWER= (A) high
Explaination:- For testing of appliances or equipments the wattage of test lamp should be high , because higher wattage lamp have lower resistance and will not blow up the testing appliances.
Check Answer