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# ISC Specimen 2015 Physics Paper 2 (II of II)

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 Isc Indian School Certificate Examination (ISC), New Delhi
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(ii) Take out 1 plug from the resistance box RB so that R = 1 . By touching the jockey J gently at various points on the wire AB, find the null point N for which the galvanometer shows no deflection. Record l = AN in cm, correct upto one decimal place. (iii) Repeat the experiment for five more values of R in the range 1 10 , each time finding and recording the value of l. (iv) Show any one of the readings in (iii) above to the Visiting Examiner. 100 R (v) Tabulate all the six sets of values of R, l and y = , with their units. Compute y l upto one decimal place. (vi) Plot a graph of y vs R and draw the line of best fit. Change in y (vii) Determine the slope S of the line using S = . Change in R Record the value of S upto three significant figures. (viii) From the graph, read and record the value Yo of Y when R = 0. B. Find and record the least count of the given screw gauge in mm. Using it, determine the diameter D of the sample wire W . Record its value in your answer book, in mm. Then, find the radius r of the wire in cm. Using this value of r and the value of Yo from Part A , find the value of K where: K = r 2Yo 10 4. K is a measure of the resistivity of the material of the wire. Question 2 [8] This experiment determines the focal length of a convex lens by the displacement method. (i) Determine the approximate focal length f1 of the given convex lens (marked M) by projecting the image of a distant object on a wall or a screen. Record the value of f1 in cm, correct upto one decimal place. Figure 2(a) (ii) Arrange the object pin O, the image pin I and the lens M on the optical bench or table top as shown in Figure 2(a) so that the tips of O and I lie on the principal axis of the lens. ---------------------------------------------------------------------------------------------------------------------------38 ISC SAMPLE QUESTION PAPER 2015

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(iii) Adjust the distance x between O and I to be equal to 70 cm. Ensure that this separation is maintained throughout this particular set up. (iv) Move the convex lens towards the image pin I and adjust its position until the diminished and inverted image of O coincides with the image pin I. Record the position M1 of the lens on the metre scale. (v) Figure 2(b) (vi) Now move the lens towards the object pin O and adjust its position as shown in Figure 2(b) until the magnified and inverted image of O coincides with I. Record the new position M2 of the lens. (vii) The difference between the two positions M1 and M2 is the displacement d of the lens. Calculate and record the value of d in cm, correct upto one decimal place. (viii) Repeat the experiment to obtain four more sets of x and d where the range of x is between 70 cm and 100 cm. Note that parallax is to be removed by moving the lens M only. (ix) Show the image position when the parallax has been removed, in any one of the readings in (viii) above to the Visiting Examiner. (x) (xi) x2 -d 2 Tabulate all the five sets of values of x, x2, d, d2 and f = 4x Calculate F , the mean of the five values of f and record its value with proper unit in your answer book, correct upto one decimal place. Question 3 Show the following to the Visiting Examiner for assessment: (a) Project Report [7] (b) Physics Practical File. [3] ---------------------------------------------------------------------------------------------------------------------------39 ISC SAMPLE QUESTION PAPER 2015

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