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DELHI PUBLIC SCHOOL NEWTOWN SESSION 2023-24 MONDAY TEST CLASS: XI SUBJECT: PHYSICS FULL MARKS : 40 DATE: 24.07.2023 Instructions: All questions are compulsory. This paper consists of three printed pages. Allworking, including rough work slhould be done on the same sheet as and adjacent to the rest of the answer. Answers to sub parts of the same question must be given in one place only. This question paper is divided into 2 Sections Aand B. Question number 1 carries a total of 10 marks. Question numbers 2 to 6 carry 2 marks each. Question numbers 7 to 11 carry 3 marks each. " Question number 12 carries 5 mnark. The intended marks for questions are given in brackets | |. A simple scientific calculator without a programnmable memory may be used for calculations. SECTION A Answer all questions. Question 1 (A)Choose the correct alternative (i), (i), (ii)or (iv) for each of the questions |5x1] given below: (a) What is the number of significant figures in 6400.00 (i) 2 (i 4 (iii) 6 (iv) none of the above (b) The error in the measurements of mass and volume of a solid are $% and 2 respectively. The maximum percentage error of its density will be (i) 10% ) 7% ( i) 25%o (iv)3% 1 Two veetors A and B are perpendicular to cach other. If A= 4it3j. then B will (c) be () k (ii) 4i-3j (iii) 6i (iv) -4i+3j Distances of some stars are measured by spectroscopic methods if they are (d) situated (i) Less than 100 light year (i) More than 100 light year (i i)More than 200 light year (iv) none of the above (e) Which one is the field particle of cleetromagnetic force? (i)) I meson (ii) gluon (iii) neutrino (iv) photon |5x1| (B) Answer the following questions briefly and to the point: a. The distance of a galaxy is 1.1x10* m. Calculate the order of magnitude of time taken by light to reach us from the galaxy. b. Round off 5.3850to the second place of decimal. c. State Avogadro's hypothesis method for measuring small distances. d. Mention any one property of laser that is used to measure the distance between the earth and the moon. e. Name onequantity that has unit, but still dimensionless. SECTION B Answer all questions Question 2 The figure below shows the aceeleration graph of a body. Draw the corresponding velocity-time graph. At time t=0, the velocity v= 0. 3 0 -2 (S) |2| Question3 R=(2.5 0.1) A potential difference, V= (9.5+0.2) volt is applied across a resistance, ohm. Find the current with error limits. Question 4 State the triangle law of vector addition with a diagram. |2| |2| Question 5 mole one of volume atomic The radius of hydrogen atom is 5x10"m. Find the total of hydrogen atom. Question 6 = -2t+25 m/s. Given A particle moves along a line. Its acceleration function is a(t) that v(0)= 15m/s. Find the velocity funetion. Question 7 A jet of water of cross- sectional area A and velocity v strikes normally ona flat 3] plate. If the mass per unit volume of water be p, use dimensional analysis method to obtain an expression of force F exerted by the jet against the plate. |3| Question 8 Amanufacturing company findsthat its profit from assembling acertain number of bicyeles per day is given by the formula P(n) =-n'+s0n -100. How many bicycles need to beassembled per day to nmaximize profit? What is the maximum profit? Question 9 |3| Aball is dropped from a height. If it takes 0.2 s to cross the last 6.0 m before hitting the ground, find the height from which it is dropped. Take g=10m/s Question 10 Derive s= utt% at withthe help of calculus. [symbols have their usual meaningl Question 11 |3| |3] Draw a graph of time period vs mass for an inertial balance. State any two factors on which the time period of vibration of the pan of an inertial balance depends?. Question 12 Find the area of a parallelogram whose adjacent sides are represented as A= 2i+3j-2k and B-6i+5j-2k. Findavector whose magnitude is 12 and which is perpendicular to each of the vectors, 3
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