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Physics RS Academy Ronak Shah - 9428239499 Page 2 of 7 7) Assertion: In the circuit shown in figure R is variable. Value of current I is maximum when R = r. Reason: At R = r, maximum power is produced across R. Choose the correct option. 1) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion. 2) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion. 3) If Assertion is true, but the Reason is false. 4) If Assertion is false, but the Reason is true. 8) In order to increase the resistance of a given wire of uniform cross-section to four times its value, a fraction of its length is stretched uniformly till the full length of the wire becomes 3/2 times the original length. What is the value of this fraction? (1) 1/4 (2) 1/8 (3) 1/16 (4) 1/6 9) The potential difference between points A and B is (1) 20/7 V (2) 40/7V (3) 10/7 V (4) Zero 10) The potential difference VA − VB between points A and B for the circuit segment shown in figure at the given instant is (1) 12 V (2)– 12 V (3) 6 V (4)– 6 V 11) Four ways of making a network of five capacitors of the same value are shown in four choices. Three out of four are identical. The one which is different is (1) (2) (3) (4) 12) A 2μF capacitor C1 is charged to a voltage 100 V and a 4 μF capacitorC2 is charged to a voltage 50 V. The capacitors are then connected in parallel. What is the loss of energy due to parallel connection? (1) 1.7 J (2) 0.17 J (3) 1.7 × 10−2 J (4) 1.7 × 10−3 J 13) Given that potential difference across 1 μF capacitor is 10 V. Then, A. potential difference across 4μF capacitor is 40 V B. potential difference across 4μF capacitor is 2.5 V C. potential difference across 3 μF capacitor is 5V D. value of E is 50 V Choose the correct answer from the options given below: (1) A,C and D only (2) B and D only (3) C and D (4) B Only. 14) A capacitor of 4 μ F is connected as shown in the circuit. The internal resistance of the battery is 0.5Ω. The amount of charge on the capacitor plates will be