ELECTRICITY MCQ QUESTIONS

1.  What is the rate of flow of electric charges called?

(a)  Electric potential

(b)  electric conductance

(c)  Electric current

(d)  none of these

2.  Which of the following is the SI Unit of Electric Current?

(a)  ohm

(b)  ampere

(c)  volt

(d)  faraday

3.  Which instrument is used for measuring electric potential?

(a)  Ammeter

(b)  galvanometer

(c)  voltmeter

(d)  potentiometer

4.  When one unit electric charge moves from one point to another point in an electric circuit, then the amount of work done in joules is known as?

(a)  Electric current

(b)  electric resistance

(c)  electric conductance

(d)  potential difference

5.  The hindrance presented by material of conductor to the smooth passing of electric current is known as:

(a)  Resistance

(b)  Conductance

(c)  Inductance

(d)  None of these

6.  The resistance of a conductor is directly proportional to:

(a)  Its area of cross-section

(b)  density

(c)  melting point

(d)  length

7.  The purpose of a rheostat is:

(a)  Increase the magnitude of current only

(b)  Decrease the magnitude of current only

(c)  Increase or decrease the magnitude of current

(d)  None of these

8.  Point to be kept in mind for verification of Ohm’s Law is:

(a)  Ammeter and voltmeter should be connected in series

(b)  Ammeter should be connected in series and voltmeter in parallel

(c)  Ammeter should be connected in parallel and voltmeter in series

(d)  Ammeter and voltmeter should be connected in parallel

9.  When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. Find the value of the resistance of the resister:

(a)  5000 Ω

(b)  800 Ω

(c)  0.8 Ω

(d)  none of these

10.  A battery of 6V is connected in series with resisters of 0.1 ohm , 0.15 ohm,0.2 ohm,0.25 ohm and 6 ohm. How much current would flow through the 0.3 ohm resistor?

(a)  0.895A

(b)  2.22A

(c)  1A

(d)  none of these

11.  A fuse wire is inserted in a?

(a)  . Live wire

(b)  . In the neutral wire

(c)  . In the earth wire

(d)  . May be connected in any line.

12.How the charge will flow?
(a)By heating them
(b)By applying potential difference
(c)Both
(d)None of the above

13.If length of a conductor and it’s radius is increased twice, how the resistance will change?
(a)Resistance will remain unchanged
(b)Resistance increases twice
(c)Resistance will become half
(d)Resistance will increase 4 times

14. The potential difference applied is directly proportional to current only if
(a)Always
(b)Never
(c)Sometimes
(d)When temperature is constant

15.Equivalent resistance of 4 4Ω resistances in parallel is
(a)4Ω
(b)1Ω
(c)2Ω
(d)16Ω

16. Which of the following conditions represent more resistance at constant temp?
(a)The red line
(b)The yellow line
(c)Both are equal
(d)Can’t be said

17. There is a wire of length l and cross section A. Which of the following have least Resistance?
(a)Length doubled, Area halved
(b)Length tripled, Area doubled
(c)Length halved, Area doubled
(d)The original Wire

18.On which of the following parameters specific resistance depends?
(a)Length of wire
(b)Area of wire
(c)Current passing through it
(d)Temperature

19. A resistor of length l is connected to a battery and current I is flowing through it. If it is divided into 3 parts by length, and all are having same cross sectional area are connected in series with the same battery, the current flowing through them will be?
(a)I/3
(b)3I
(c)I
(d)3I/2

20.Two resistances R1 and R2 are connected with a cell in parallel. Find the ratio of current flowing through R1to the current flowing through R2.
(a)R1:R2
(b)R2:R1
(c)1:1
Data not sufficient

21. Which of the following statement is true regarding Ammeter and Voltmeter?
(a)Ammeter is connected in series with the required device, Voltmeter in Parallel
(b)Both Ammeter and Voltmeter are connected in series with required device
The Voltmeter is connected in series with the device, Ammeter in parallel
(d)They can be connected in any way.