10 Electricity

Topic : Electricity, Electric potential, Resistance , Ohm’s law, Energy consumption
Q-I Multiple choice questions:

1. State whether the currents and potential difference in all the bulbs will be same or different
when in a circuit three bulbs of :
(a) same wattage are connected in series. (b) same wattage are connected in parallel.
(c) different wattage are connected in series. (d) different wattage are connected in parallel.
2. When a 4 V battery is connected across an unknown resistor, there is a current of 100 mA in the
circuit. The value of the resistance of the resister is
(a) 4 Ω (b) 40 Ω (c) 400 Ω (d) 0 4. Ω
3. The maximum resistance which can be made using four resistors each of resistance 1 / 2 Ω is :
(a) 2 Ω (b) 1 Ω (c) 2 5. Ω (d) 8 Ω
4. Electrical resistivity of a given metallic wire depends upon
(a) its length (b) its thickness (c) its shape (d) nature of the material
5. A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a
Cross section of the filament in 16 seconds would be roughly
(a) 1020 (b) 1016 (c) 1018 (d) 1023
6. What is the maximum resistance which can be made using five resistors each of 1 / 5Ω ?
(a) 1 5/ Ω (b) 10 Ω (c) 5 Ω (d) 1 Ω
7. What is the minimum resistance which can be made using five resistors each 1 / 5 Ω ?
(a) 1 5/ Ω b) 1 2/ 5 Ω (c) 1 1/ 0 Ω (d) 25 Ω
8. A student carries out an experiment and plots the V -I graph of three samples of nichrome wire with
resistances R R1 2 , and R3 respectively (Figure). Which of the following is true ?
(a) R 1 = R2 = R3 (b) R 1> R2> R3 (c) R3 > R2 > R1 (d) R 2 > R 3 > R1
9. Match the column I to column II and select the correct answer using the codes given below:
10. Which of the following represents the voltage ?
Work done Work done x Time

(a) ( B) Work done x Charge ( C) ( d) Work done x charge x
Current x Time Current
Time
11. Match the column I to column II and select the correct answer using the codes given below:
Q-II. Answer the following questions
1. How much will an electric iron draw from a 220 V source if the resistance of its elements when hot is
55 ohms? Calculate the wattage of the electric iron when it operates on 220 volts.
2. Can you run an electric geyser with power rating 2 kW, 220 V on a 5 A line? Give reason to justify
your answer.
3. V -I graph for the two wires A and B are shown in the figure. If we connect both the wires one by one
to the same battery which of the two will produce more heat per unit time? Give justification for your
answer.
5. Draw a schematic diagram of a circuit consisting of 24 V battery, a 10 ohm resistor, a 5 ohm resistor,
a 1 ohm resistors, an ammeter and a plug key, all connected in series. Calculate the ammeter
reading in this circuit.
6. Express the electrical energy in Joules. The rating of an electric heater is 1100 W; 220 V. Calculate its
resistance when it operates at 220 V. Also calculate the energy consumed in kWh in the month of
November if the heater is used daily for Four hours at the rated voltage.
8. An electric bulb is marked 60 W. What does this mean. How much energy does it consume if used for
1 hour ?
9. List two distinguishing features between the resistance and resistivity of a conductor.
10. Calculate the number of electrons that would flow per second through the cross-section of a wire
when 1 A current flows in it.
11. A V -I graph for a nichrome wire is given below. What do you infer from this graph? Draw a labelled
circuit diagram to obtain such a graph.
12. Why do we use copper and aluminum wire for transmission of electric current?
13. Which alloy has the minimum resistivity? Which alloy has the minimum resistivity?
What happens to resistance of a conductor when temperature is increased?
14. What do we mean when we say that the resistivity of aluminum is 2 . 63 x 108 - ohm-meter ?
15. What is the total voltage of the combination when the resistors are in series?
16. The current flowing through a resistor connected in a circuit and the potential difference developed
across its ends are as shown in the diagram by milliammeter and voltmeter readings respectively :
(a) What are the least counts of these meters?
(b) What is the resistance of the resistor?

17. The current flowing through a resistor connected in an electrical circuit and the potential difference
developed across its ends are shown in the given ammeter and voltmeter. Find the least count of the
voltmeter and ammeter. What is the voltage and the current across the given resistor?

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Topic : Electricity, Electric potential, Resistance , Ohm’s law, Energy consumption

Q-I Multiple choice questions:

circuit. The value of the resistance of the resister is

(a) 4 Ω (b) 40 Ω (c) 400 Ω (d) 0 4. Ω

(a) 2 Ω (b) 1 Ω (c) 2 5. Ω (d) 8 Ω

4. Electrical resistivity of a given metallic wire depends upon

5. A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a

Cross section of the filament in 16 seconds would be roughly

(a) 1020 (b) 1016 (c) 1018 (d) 1023

(a) 1 5/ Ω (b) 10 Ω (c) 5 Ω (d) 1 Ω

(a) 1 5/ Ω b) 1 2/ 5 Ω (c) 1 1/ 0 Ω (d) 25 Ω

resistances R R1 2 , and R3 respectively (Figure). Which of the following is true ?

10. Which of the following represents the voltage ?

Work done Work done x Time

reading in this circuit.

when 1 A current flows in it.

circuit diagram to obtain such a graph.

What happens to resistance of a conductor when temperature is increased?

(a) What are the least counts of these meters?

(b) What is the resistance of the resistor?

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