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ISC Class XII Analysis Of Pupil Performance 2016 : Physics

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PHYSICS PAPER 2 (PRACTICAL) Answer all questions. You should not spend more than one and a half hours on each question. Question 1 [10+2] This experiment determines resistivity of the material of the given wire. It is based on Wheatstone Bridge principle. You are provided with: (a) A 100 cm long and uniform metallic wire AB attached to a metre scale on a wooden board. It is provided with connecting terminals at its ends. (b) A coiled resistor P on a wooden frame with terminals. (c) A resistance box R.B. of range 0 to 10 . (d) A central zero galvanometer G. (e) 2V d.c. source E. (f) A jockey J. (g) A plug key K. (h) A specimen wire W. (i) A micrometer Screw Gauge (j) A few connecting wires (A) (i) Arrange the circuit as shown in Figure 1 below. Make sure that all connections are tight. P R.B. G A 0 cm B 100 cm C J l E ( ) K Figure 1 (ii) Keep the value of E at 2V. (iii) Close the key K. Take out a 1 plug from the resistance box R.B so that x = 1 . (iv) Place the jockey J gently at different points on the wire AB till at a certain point C, the galvanometer G shows no deflection. Note and record the length AC = l in cm, correct upto one decimal place. 36

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Additional Info : ISC Class XII Analysis Of Pupil Performance 2016 : Physics
Tags : ISC Board, Class 11th, Class 12th, NDA/NA Entrance Examination

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