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ISC Class XII Board Exam 2019 : Physics

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Yuvraj Singh
Ingraham Institute English Medium School ICSE, Ghaziabad
vII-XII PCM

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PHYSICS PAPER _ 2 (PRACTICAL) (Muximum Marks:30) (Time allowed: Three hours) (Candidates are allowed additional I5 minutes for only reading the paper. They must NOT start writing during this time.) ALL ANSWERS MUST BE WRITTEN IN THE ANSWER BOOKLET PROVIDED SEPAR.ATELY. If squared paper is used, it must be attached to the answer booklet. Marks are given Jbr a clear record of observations actually made, for their suitability and accuracy, andfor the use made of them. Statement of the theory, procedure of the experiment, apparatus, circuit diagrams, precautions are not required to be written unless spectfically askedfor. Candidates are adviserl to record their observations as soon as they have been made. All working, inclutling rough work, should be done on the same sheet as, and adjacent to, the rest of the answer. Mathematical tables and squared paper are provided. The intended marks Jbr questions or parts of questions are gtven in brackets I J . Note: Procedure of the Expertment, rfly diagram, circuit diagram ond precautions ure not to be written in your snshter booklet. Answer a,ll questions. You should not spend more than one and a half hours on each question. Question I t9l This experiment determines the focal length of the given convex lens by no parallax method. You are provided with: (a) (b) (c) (d) Two optical pins A convex lens A lens holder An optical bench Note: If an optical bench is not available, the experiment may be performed on a table top, using a metre scale. This Paper consists of 4 printed pages. t2l9-8618 @ Copyright reserved. Turn over (i) Arrange the object pin O, the image pin I and the lens L on an optical bench or a table top as shown in Figure I below. Adjust the height of the object pin O and that of the image pin I so that their tips lie on the principal axis of the lens. lI' I lz *Xir cm v l'<-- (ii) s Figure I Place the object pin O at the 0'0 cm mark and the lens L at 70'0 cm mark so that the object distance u : 70.0 cm (i.e. the distance between the lens and the object pin)' (iii) Look at the tip of the object pin 0 through the lens L frorn a distanoe so that you see an inverted image (I') of the object pin O. (iv) Now, adjust the position of the irnage pin I in such a way, that there is no parallax between I and I'. Ensure that tip to tip parallax is removed. If necessary, you may adjust the heights of the two pins O and I. (v) At no parallax, note the position of the image pin I and record the image distance y: LI (i.e. the distance between the lens and the image pin) in cm, correct upto one decimal place. (vi) Repeat the experiment for four more values of u, i.e. r : 60'0cm, 50'0cm, 40'0cm and 30'0cm. Each time, remove the parallax and find the value of v. (vii) For each value of u andu, calculate y:#andx two decimal places. (viii) = H andrecord its value upto Tabulate all five sets ofvalues of u,v, y andx with their units. (ix) Show any one of the readings in (viii) above, to the Visiting Examiner. (x) Plot a graph ofy vs x. (xi) Draw the best fit line. (It must be thin and unifurm.) (xii) (xiii) Find its srope s, using g:'4onge t-.n-y cnange tn x Record the value of S, rounded upto three significant figures. (xiv) Find f : S x L0 and record its value in your answer booklet, correct upto one decimal place with proper unit. 1219-8618 | .t'!i--:N:- 2 Question This experiment determines the resistance per unit length of the given wire. You are provided with: rcl (a) A 100 cm long and uniform metallic wire AB attached to a metre scale on board. It is provided with binding terminals at its ends. A resistance box R.B. of range 0 to l0 C). a wooden (b) (c) (d) (e) (f) (e) (h) (i) An ammeter A of range 0 - 1A AVoltmeterV of range 0-3V AjockeyJ A plug key K A 4V d.c. power supply E A few connecting wires. Arrange the circuit as shown in Figure 2 below. Make sure that all connections are tight. E K / a 75 cm--------------) 0 C J B cm Figure 2 (iii) (iv) (v) , Close the key K and take out a lQ plug from the resistance box R.B. so that R: lQ. Ensure that all other plugs in the resistance box are tightly closed. Place the jockey J at point C on the wire AC such that AC : 75 cm. The reading of the ammeter and the voltmeter must be within its range. Read and record the readings of the ammeter and the voltmeter, i.e. v and r with proper units. Repeat the experiment to obtain four more values of R , i.e. R : 2e,3e, 4e and 5O. Each time, record readings of R, V and L Ensure that the jockey is always kept at the same position c, such that AB : 75 cm in all five sets of readings. Determine the value of r using r=-V for each set, correct upto.three significant figures. (vi) v, r and r with proper units. (vii) Show any one of the above readings in (vi) above, to the visiting Examiner. (viii) Find ra the mean of all the five values of r and record its value in your answer Tabulate all the five sets of values of R, booklet, upto one decimal place with proper unit. (ix) Calculate X = I75 and record its value correct upto one decimal place with proper unit, in your answer booklet. (whereK is reisitance psy unit length) 3 12r9-8618 Turn over Question 3 Show the following to the Visiting Examiner for assessment: Project l10I Physics Practical File. lsI 4 1219-8618

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