Electricity: Class 10 Previous Year Questions

Electricity questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. (a) The resistance of a wire of 0.01 cm radius and 1.0 cm length is 7 2. Calculate its resistivity. OR (b) An electric heater is rated 220 V; 11 A. Calculate the power consumed if the heater is operated at 200 V.
   Board 20265 markslong answer
2. The values of current I flowing in a given resistor for the corresponding values of potential difference V applied across the ends of resistor are given below in the table : I (Amperes) 0·4 0·8 1·2 1·6 2·0 V (Volts) 1·2 2·4 3·6 4·8 6·0 Plot a graph between V a…
   Board 20264 marksshort answer
3. Read the following passage and answer the questions that follow : Swati, a class 10 student, observes that when she passes close to the refrigerator in her kitchen, she feels the heat, although the things kept inside the refrigerator are cool. (a) Describe the…
   Board 20264 markscase-based
4. (a) Describe an activity to show that a current carrying conductor, placed in an external magnetic field experiences a force. (b) Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally towards the front wall…
   Board 20265 markslong answer
5. (a) (i) Due to change in length and area of cross-section of a conductor, resistance of conductor changes while resistivity does not change. Why ? (ii) Conductors of electric toasters and electric iron are made of an alloy rather than a pure metal. Why ? (ii) …
   Board 20264 marksshort answer
6. Four identical resistors of 12  each are connected in series to form a square ABCD as shown in the figure. The resistance of the network between the two points 1 and 2 is : (A) 48  (B) 36  (C) 9  (D) 6 
   Board 20251 markMCQ
7. Three resistors of 2 , 3  and 6  are connected in (i) series, and (ii) parallel. Draw the arrangements of the resistors and find the equivalent resistance of each arrangement.
   Board 20253 marksshort answer
8. (a) Write the relationship between resistivity and resistance of a cylindrical conductor of length l and area of cross-section A. Hence derive the SI unit of resistivity. (b) Why are alloys used in electrical heating devices ?
   Board 20253 marksshort answer
9. (a) A wire of resistance R is cut into three equal parts. If these three parts are then joined in parallel, calculate the total resistance of the combination so formed. 2 OR (b) Define electric power. When do we say that the power consumed in an electric circu…
   Board 20252 marksshort answer
10. An electric kettle is rated 750 W; 220 V. Can this kettle be used in a circuit which has a fuse of current rating 3 A ? Give reason for your answer.
    Board 20252 marksshort answer
11. In our homes, we receive the supply of electric power through a main supply also called mains, either supported through overhead electric poles or by underground cables. In our country the potential difference between the two wires (live wire and neutral wire)…
    Board 20254 marksshort answer
12. Assertion (A) : Nichrome is an alloy which is commonly used in electrical heating devices such as electric irons, toasters, etc. Reason (R) : The resistivity of nichrome is high and its resistance decreases with increase in temperature.
    Board 20251 markAssertion-Reason
13. (A) (i) Define electric power. Express it in terms of potential difference (V) and resistance (R). (i) An electric oven is designed to work on the mains voltage of 220 V. This oven consumes 11 units of electrical energy in 5 hours. Calculate : (a) power rating…
    Board 20245 markslong answer
14. When electric current flows in a purely resistive circuit electrical energy gets fully converted into heat energy. The amount of heat produced (H) in the circuit is found to be directly proportional to (i) the square of current (I2) (ii) the resistance (R) of …
    Board 20244 marksshort answer
15. The maximum resistance of a network of five identical resistors of each can be - (A) 12 (B) 0.5 2 (C)0.25 Q (D) 0.1
    Board 20241 markMCQ
16. (A) Show how you would connect three resistors each of resistance 6 2, so that the combination has a resistance of 9 2. Also justify your answer. 13 (B)2() : 12 6 V 26. (i) () 27. (·a p hl (l) (i) 284.6 29. (i) (ii) (a) (b) 1 le e E (c) ··· (d) 14 OR (B) In th…
    Board 20242 marksshort answer
17. Use Ohm's law to determine the potential difference across the 3 resistor in the circuit shown in the following diagram when key is closed : 2 V 12 32 biological processes. Give two ways by which they harm various components of an ecosystem.
    Board 20242 marksshort answer
18. Study the I-V graph for three resistors of resistances Ri, R² and R, and select the correct statement from the following : R1 R2 R3 (ampere) V (volts) Ri = Rz = R3 (B) (A) Ri >R² >Rg R >R² >Ri (D) (C) Rz>Rg>R1
    Board 20241 markMCQ
19. (a) An electric iron consumes energy at a rate of 880 W when heating is at the maximum rate and 330 W when the heating is at the minimum. If the source voltage is 220 V, calculate the current and resistance in each case. (b) What is heating effect of electric …
    Board 20235 markscase-based
20. If four identical resistors, of resistance 8 ohm, are first connected in series so as to give an effective resistance Rs, and then connected in parallel so (a) 32 (b) (c) 0.5 (d) 16
    Board 20231 markMCQ

Practise all 47 Electricity questions with answers →

Other Class 10 Science chapters

Frequently asked questions