# ELECTRICITY PROBLEMS BASED ON PRACTICAL SKILLS

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1 ELECTRICITY PROBLEMS BASED ON PRACTICAL SKILLS

2 1 To determine the equivalent resistance of two resistors when connected in series, a student arranged the circuit components as shown in the diagram. But he did not succeed to achieve the objective. Which of the following mistakes has been committed by him in setting up the circuit? (A) Position of ammeter is incorrect. (B) Position of voltmeter is incorrect. (C) Terminals of ammeter are wrongly connected. (D) Terminals of voltmeter are wrongly connected.

3 2 The following circuit diagram shows the experimental set-up for the study of dependence of current on potential difference. Which two circuit components are connected in series? (A) Battery and voltmeter (C) Ammeter and Rheostat (B) Ammeter and voltmeter (D) Resistor and Voltmeter

4 3 For the circuit arrangement shown below, a student would observe: (A) Some reading in both the ammeter and the voltmeter. (B) No reading in either the ammeter or the voltmeter. (C) Some reading in the ammeter but no reading in the voltmeter. (D) Some reading in the voltmeter but no reading in the ammeter.

5 4 In an experiment to determine equivalent resistance of two resistors R 1 and R 2 in series, which of the circuit correctly shows connection the voltmeter in the circuit? (A) (i) only (B) (i) and (iii) (C) (iii) only (D) (ii) and (iv)

6 5 Which two circuit components are connected in parallel in the following circuit diagram? (A) Rheostat and voltmeter (C) Voltmeter and Ammeter (B) Voltmeter and resistor (D) Ammeter and resistor

7 6 In an experiment to study the dependence of current on potential difference across a resistor, a student obtained the graph as shown in the diagram. The value of resistance of the resistor is, (A) 0.1 ohm (C) 10 ohm (B) 1.0 ohm (D) 100 ohm.

8 7 Four students A, B, C and D. set up the circuits for studying the dependence of the current through a resistor on the potential difference across it, as follows. The correct set up is that of student: (A) A (B) B (C) C (D) D

9 8 The given circuit diagram shows the experimental arrangement of difference circuit components for determination of equivalent resistance of two resistors connected in series. The components X, Y and Z shows in the circuit respectively represent. (A) Rheostat, Resistor, Ammeter (B) Ammeter, Voltmeter, Rheostat (C) Voltmeter, Ammeter, Rheostat (D) Rheostat, Ammeter, Voltmeter

10 9 The current flowing through a resistor and the potential difference developed across its ends are show in the given diagrams. The values of resistance of the resistor is (A) ohm (C) 529 ohm (B) 5.29 ohm (D) 500 ohm

11 10 In the experiment on finding the equivalent resistance of two resistors, connected in parallel, three students connected the voltmeter in their circuits, in the three ways, X,Y and Z shown here. The voltmeter has been correctly connected in: (A) cases X and Y only (C) cases Z and X only (B) cases Y and Z only (D) all the three cases

12 11 Students A and B connect the two resistors R 1 and R 2 given to them in the manners shown below: And then insert them at X and Y into the measuring circuit shown below: We can say that

13 (A) both the students will determine the equivalent resistance of the series combination of R 1 and R 2. (B) both the students will determine the equivalent resistance of the parallel combination of R 1 and R 2. (C) Student A will determine the equivalent resistance of the series combination while student B will determine the equivalent resistance of the parallel combination of R 1 and R 2 (D) Student A will determine the equivalent resistance of the parallel combination while student B will determine the equivalent resistance of the series combination of R 1 and R 2.

14 12 To study the dependence of current (I) on potential difference (V) across a resistor R, two students used the two set ups shown in figure A and B respectively. They kept the contact point J in four different positions, marked (i), (ii), (iii) and (iv) in the two figures. For the two students, the ammeter and voltmeter readings will be maximum when the contact J is in the position: (A) (iv) in both the set ups (B) (i) in both the set ups (C) (iv) in set up A and (i) in set up B (D) (i) in set up A and (iv) in set up B

15 13 In the experiment on finding the equivalent resistance of two resistors connected in series, three students connected the ammeter in their circuits in the three ways X, Y and Z as shown here. Assuming their ammeters to be ideal, the ammeter have been correctly connected in (A) cases X and Y only (C) cases Z and X only (B) cases Y and Z only (D) all the three cases

16 14 Which of the circuit components in the following circuit diagram are connected in parallel? (A) R 1 and R 2 only (C) R 2 and V only (B) R 1, R 2 and V (D) R 1 and V only

17 15 To determine the equivalent resistance of a series combination of two resistors R 1 and R 2, a student arranges the following set up. Which one of the following statements will be true for this circuit? It gives: (A) incorrect reading for current I as well as potential difference V. (B) correct reading for current I but incorrect reading for potential difference V. (C) correct reading for potential difference V but incorrect reading for current I. (D) correct reading for both I and V.

18 16 The correct set up for determining the equivalent resistance if two resistors R 1 and R 2 when connected in parallel is (A) (I) (B) (II) (C) (III) (D) (IV)

19 17 For carrying out the experiment, on finding the equivalent resistance of two resistance connected in parallel, a student sets up the circuit as shown. The teacher checks it and tells him his circuit has one or more of the following faults. A. The resistors R 1 and R 2 have not been correctly connected in parallel. B. The voltmeter has not been correctly connected in the circuit. C. The ammeter and key have been incorrectly connected in the circuit. Out of these three, the actual fault in his circuit is/are: (A) both A and B (C) only A (B) both B and C (D) only B

20 18 While doing experiment, on finding the equivalent resistance of two resistors connected in series, three students A, B and C set up their circuit as shown below: The correct set up is that of: (A) students A and B (C) students C and A (B) students B and C (D) all the three students

21 19 For the circuits shown in Figure I and II, the voltmeter reading would be: (A) 2V in circuit (I) and 0V in circuit (II) (B) 0V in both circuits (C) 2V in both circuits (D) 0V in circuit (I) and 2V in circuit (II)

22 20 In a voltmeter, there are 20 divisions between the 0 mark and 0.5 V mark. The least count of the voltmeter is: (A) V (B) V (C) 0.050V (D) 0.250V

23 21 The current flowing through a conductor and the potential difference across its two ends are as per readings of the ammeter and the voltmeter shown below. The resistance of the conductor would be: (A) 0.02 ohm (C) 20.4 ohm (B) 0.24 ohm (D) 24.0 ohm

24 22 The following instruments are available in laboratory: Milliammeter A 1 of range ma and least count 10 ma. Milliammeter A 2 of range ma and least count 50 ma. Voltmeter V 1 of range 0-5V and least count 0.2V. Voltmeter V 2 of range 0-3V and least count 0.3V. Out of the following pairs of instruments, which pair would be the best choice for carrying out the experiment to determine the equivalent resistance of two resistors connected in series? (A) Milliammeter A 1 and voltmeter V 1 (B) Milliammeter A 2 and voltmeter V 2 (C) Milliammeter A 1 and voltmeter V 2 (D) Milliammeter A 2 and voltmeter V 1

25 23 Which one of the given four milliammeter would you use for measurement of current flowing in a circuit? (A) I (B) II (C) III (D) IV

26 24 The resistors R 1 and R 2 are connected in: (A) parallel in both circuits. (B) series in both circuits. (C) parallel in circuit I and in series in circuit II. (D) series in circuit I and in parallel in circuit II.

27 25 Circuit I : ammeter reads current i 1 and voltmeter reads V 1 Circuit II : ammeter reads current i 2 and voltmeter reads V 2 The relationship between the readings is (A) i 1 > i 2 ; V 1 = V 2 (B) i 1 < i 2 ; V 1 = V 2 (C) i 1 > i 2 ; V 1 > V 2 (D) i 1 < i 2 ; V 1 < V 2

28 ANSWER KEY C C A B B C A B B D C C A B B B A B D B C A B C B

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