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Class 10, Chapter Third Test (Electricity), Very Short Answer type questions (1 Mark each), 1. What is meant by the term potential difference between two points?, 2. What determines the flow of charge?, 3. How are the electric charge, electric current, and time-related to each other?, 4. Name the instrument used for measuring (a) current, (b) potential difference., 5. What is the name of physical quantity which is equal to V/I?, 6. What kind of plot would you get when I is plotted against V?, 7. What is work done in moving charge Q coulombs against a potential difference of V, volts?, 8. State the law of combination of resistance in (a) parallel and in (b) series., 9. Why is a series arrangement not used for connecting domestic electric appliances in a, circuit?, 10. The electrical resistivity of a few materials is given below in ohm-meter. Which of these, materials can be used for making elements of a heating device?, A 6.84 × 10-8 B 1.60 × 10-8, C 1.00 × 10-4, D 2.50 × 1012, E 4.40 × 10-5, F 2.30 × 1017, , Short Answer type questions (2 Mark each), 11. State Ohm’s law. Draw a circuit diagram to establish a relationship between potential, differences across the two ends of a resistor and the current flowing through it., 12. What do you conclude from the relationship, H= I2Rt., 13. Two students perform the experiment on series and parallel combinations of two given, resistors R1 and R2 and plot the shown alongside V-I graphs., Series, , Parallel, Parallel, , V, , I, , Series, , I, , V, , Which of the graph is (are) correctly labelled in terms of the word ‘series’ and ‘parallel’?, Justify Your answer., 14. A household uses the following electric appliances:, a) Refrigerator of rating 400 W for ten hours each day., b) Two electric fans of rating 80 W each for twelve hours each day., Calculate the electricity bill of the household for the month of June if the cost per unit, of electric energy is ₹3.00.

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15. Write expression for electric power when, a) Voltage and current are given., b) Current and resistance are given., c) Voltage and resistance are given., How are the domestic electrical appliances rated?, 16. The following set of results was obtained, Potential Difference (v), 2, 4, 6, 8, 10, Current (A), 0.74, 1.50, 2.22, 2.96, 3.70, a) Plot graph of potential difference on the y-axis against current on the x-axis., b) Explain graph., c) Use the graph to obtain a value for resistance of the conductor.