PHYSICS MCQ (TERM-1) BOARD PAPERS

Transcription

1 GRADE: 10 PHYSICS MCQ (TERM-1) BOARD PAPERS 1 The number of division in ammeter of range 2A is 10 and voltmeter of range 5 V is 20. When the switch of the circuit given below is closed, ammeter reading is at 8th division and voltmeter reading is at 8th divisions. The value of resistance of resistor is (a) 1.25Ω (b) 2Ω (c) 0.75Ω (d) 1.5Ω. 2 In Ohm s law experiment, the physical quantity/quantities which is/are to kept constant while doing experiment is/are: (a) potential difference (b) current (c) Temperature (d) potential difference, current, temperature. 3 Ohm s law experiment is performed separately with individual resistors R1, R2 [R1>R2] and series combination of R1, R2. Graph is plotted between potential difference (V) and current (I) as shown in figure for each case: Identify which one is for R1, R2 and combination of resistors? In the graph A, B and C respectively represents : (a) R1, R2 and series combination (b) series combination, R2, R1 (c) R2, R1 and series combination (d) series combination, R1, R2. 4 Three students drew following circuit diagrams to find resistance of parallel combination of two resistors. Correct circuit diagram/diagrams are a) I, II (b) II, III (c) II only (d) I only.

2 5 The circuit diagram shown below is used to find the effective resistance of two resistors in series. Which circuit diagram represents correctly? (A) a (B) b (C) c (D) d. 6 Which of the following is the correct method to connect the ammeter and voltmeter with resistance in the circuit to verify Ohm s law? (a) Ammeter and voltmeter in series (b) Ammeter in series and voltmeter in parallel (c) Ammeter in parallel and voltmeter in series (d) Ammeter and voltmeter in parallel. 7 An ammeter has a range of (0 3) ampere and there are 30 divisions on its scale. What is its least count? (a) 1.0 A (b) 0.5 A (c) 0.1 A (d) 0.01 A 8 Equivalent resistance of three resistors each of resistance of 2Ω connected in series as determined experimentally should be : (a) 4Ω (b) 6Ω (c) 9Ω (d) 2Ω 9 The reading shown by milliammeter and voltmeter are : (a) 130 ma, 0.8V (b) 160mA, 0.8V (c) 160mA, 0.6V (d) 130mA, 0.6V 10 Four students plot graphs between V and I, showing dependence of current I on potential difference, V across a resistor, as shown:-

3 The correct graph is:- (a) I (b) II (c) III (d) IV 11 In the circuit given below, on plugging the key, the voltmeter reads 2.0 V but ammeter reads 0.6 A. The resistance of the combination is:- (a) 1.2Ω (b) 3.3Ω (c) 3.0Ω (d) 15Ω 12 In an experiment to find the equivalent resistance of two resistors connected in series, four circuits were set up as shown. The voltmeter has been correctly connected in the arrangement:- (a) I (b) II (c) III (d) IV 13 The readings of current flowing through a conductor and the potential difference across its two ends are shown in the ammeter and voltmeter given below. The resistance of the conductor would be: (a) 20Ω (b) 5Ω (c) 2Ω (d) 0.2Ω 14 Two students (A) and (B) connected their two given resistors R1 and R2 in the manners shown below:

4 Student A connects the terminals marked b1 and c1 while B connects the terminals marked d2 and c2 in their respective circuits at the points marked X and Y. The equivalent resistance measured by A and B will be: (a) of series combination of the two resistors. (b) of the parallel combination of the two resistors. (c) of series combination for student A while parallel combination of the two resistors for B. (d) of the parallel combination for A while of the series combination of the two resistors for B. 15 In figures given below : Circuit I : ammeter reads current i1 and voltmeter reads V1. Circuit II : ammeter reads current i2 and voltmeter reads V2. The relation between the readings is: (a) i1 > i2 ; V1 = V2 (b) i1 > i2 ; V1 > V2 (c) i1 < i2 ; V1 = V2 (d) i1 < i2 ; V1 < V2 16 The correct set up for studying the dependence of the current on the potential difference across a resistor is:

5 (a) A (b) B (c) C (d) D 17 In the circuits given below. The resistors R1 and R2 are connected : Circuit-I Circuit-II (a) in parallel in both circuits (b) in series in both circuits. (c) in parallel in circuit I and series in circuit II (d) in series in circuit I and parallel in circuit II 18 An ammeter has 20 divisions between 20 ma and 30 ma as marked. The least count of the ammeter. (a) 0.5 ma (b) 1mA (c) 0.25mA (d) 0.05 ma 19 What will happen to the current passing through a conductor if potential difference across it is doubled and the resistance is halved? (a) remains unchanged. (b) becomes double (c) becomes halved (d) becomes four times 20 A student has to connect 4 cells of 1.5 V each to form a battery of 6V. Which arrangement is correct? (a) A (b) B (c) C (d) D 21 If a student while studying the dependence of current on the potential difference keeps the circuit

6 closed for a long time to measure the current and potential difference, then: (a) Ammeter s zero error will change. (b) ammeter will show more reading than the actual one. (c) voltmeter will show higher readings than actual one. (d) resistor will get heated up and its value will change. 22 In an experiment on studying the dependence of the current (I), flowing through a given resistor, on the potential differences (V) applied across it, a student is to change the value of the current. For doing this, he should change the: (a) number of cells used. (b) resistor itself. (c) ammeter used in the circuit. (d) voltmeter used in the circuit. 23 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 (b) Ammeter and Voltmeter (c) Ammeter and rheostat (d) Resistor and Voltmeter 24 We use thick copper wires as connecting wires for studying the dependence of current on the potential difference across a resistor. The reason of using thick copper wire is its: (a) easy availability (b) low cost (c) high resistance (d) low resistance 25 The rest positions of the needle in a milliammeter and volt meter when no current flows are shown in figure A. When a student used these in his experiments, the final readings of the needle were in the position shown in figure B. The correct readings of the two instruments are (a) 34m A and 4.7V respectively (b) 37m A and 4.8V respectively (c) 31m A and 4.8V respectively (d) 31m A and 4.7V respectively 26 To determine the equivalent resistance of three resistors R1, R2 and R3 which connected in parallel

7 arrangement, four students, A, B, C and D connected the resistors as follows:- The correct arrangement of the resistors is that of student (a) A (b) B (c) C (d) D 27 Study the combination of resistors given below and find the two resistors in parallel combination. 28 Following circuits are drawn by four students, to determine the equivalent resistance of two resistors when connected in parallel : The correct circuit diagram is drawn by student : (a) I (b) II (c) III (d) IV 29 A student sets up the following circuit for finding the equivalent resistance of two resistors connected in series :

8 The circuit will give : (a) correct reading for V but incorrect reading for I. (b) correct reading for I but incorrect reading for V. (c) correct reading for both V and I. (d) incorrect reading for both V and I 30 A student, while performing the experiment to find the equivalent resistance of two resistors connected in parallel, kept the circuit 'ON' for a long time and finds : (a) the voltmeter starts giving wrong observation. (b) zero error of the ammeter changes (c) potential difference of the cell changes. (d) the resistor gets heated up changing the value of R. 31 Four students connected identical cells (4 in number) of 1.5 V to form a battery of 6 V as shown below. The correct set up is that of student. (a) P (b) Q (c) R (d) S 32 For the circuits shown in figure I and II, the ammeter reading would be: (a) 1 A in circuit I and 0 A in circuit II. (b) 0 A in both circuits. (c) 1 A in both circuits. (d) 0 A in circuit I and IA in circuit II. 33 While performing the experiment of Ohm s law, a student has plotted the following graph. The resistance of the conductor would be:

9 (a) 1000 Ω (b) 10 Ω (c) 100 Ω (d) 1 Ω 34 Which one of the following is the correct statement for the electric circuit given below : (a) The voltmeter has been correctly connected. (b) The ammeter has been correctly connected. (c) Resistors, R1 and R2 have been correctly connected in series. (d) Resistors R1 and R2 have been correctly connected in parallel. 35 All elements of an electric circuit are connected in series except: - (a) Voltmeter. (b) ammeter. (c) Rheostat. (d) resistor. 36 In the experiment to study the dependence of current on the potential difference across a resistor a key is used in the circuit. Key used in the circuit should be kept off while not taking ammeter and voltmeter readings. It is necessary. (a) To avoid resistance variation. (b) To avoid heating of the resistor. (c) To satisfy the condition of the law. (d) For all the three above. 37 The following precautions were listed by a student in the experiment on the study of dependence of current on potential difference : (i) All the connections should be kept tight. (ii) The zero error in the voltmeter and ammeter should be noted and taken into consideration while recording the measurements. (iii) Use copper wire as their as possible for making connections. (iv) The positive and negative terminals of the voltmeter and ammeter should be correctly connected. (v) The key in the circuit, once plugged in, should not be taken out till all the observation has been completed. The precautions which must be observed are (a) (i), (ii) and (iv) (b) (i), (iii) and (v).(c) (i), (ii) and (v) (d) (i), (iii) and (iv) 38 A student draws the circuit diagram as shown below. The parts labelled X, Y and Z respectively are:

10 (a) Ammeter, resistor, voltmeter. (b) Ammeter, voltmeter, resistor. (c) Voltmeter, resistor, ammeter. (d) Voltmeter, ammeter, resistor. 39 The given circuit diagram shows the experimental arrangement of different circuit components for determination of equivalent resistance of two resistors connected in series. The components X, Y and Z shown in the circuit respectively, represent: (a) Rheostat, Resistor, Ammeter. (b) Ammeter, Voltmeter, Rheostat (c) Voltmeter, Ammeter, Rheostat. (d) Rheostat, Ammeter, Voltmeter. 40 In an experiment to study the dependence of current on potential difference across the terminals of a resistor, a student recorded his observations as shown: If the least counts of milliammeter and voltmeter are 2 ma and 0.1 V respectively then the correct observation is show at serial number: (a) 1 (b) 2 (c) 3 (d) 4