0 Science Electricity and Its Effects Test 02

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CBSE TEST PAPER-02 CLASS - X Science (Electricity and its Effects) 1. For the circuit arrangement shown below, a student would observe. (a) Some reading in both ammeter and 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. + _ [1] 2. A wire of resistance R is cut into five equal pieces. These pieces are connected in parallel and the equivalent resistances of the combination are R / . Then the ration (a) 1 5 1 25 R is R/ [1] (b ) 5 ( d ) 25 [1] (c) 3. The resistance of the conductor is R. If its length is doubled, then its new resistance will be (a) R (b) 2R (c) 4R (d) 8R A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 , R2 and R 3 respectively as shown in the figure. Which of the following is live? > > 4. [1] > > > = > = [1] 5. The nature of the graph between potential difference and the electric current flowing through a conductor is (a)parabolic (b) circle (c) straight line (d) hyperbolic Define the term “volt”? Why does the connecting rod of an electric heater not glow while the heating element does? n resistors each of resistance R are first connected in series and then in parallel. Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks 6. 7. 8. [2] [2] [2] What is the ratio of the total effective resistance of the circuit is series combination and parallel combination? 9. 10. Draw a schematic diagram of a circuit consisting of 3V battery, 5 ohm, 3 Ω and 1 Ω resistor, an ammeter and a plug key, all connected in series. The length of different metallic wires but of same area of cross

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