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CBSE Class 12 Board Exam 2022 :

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Kendriya Vidyalaya (KV), Ashok Nagar, Chennai
12 CBSE

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KENDRIYA VIDYALAYA SANGATHAN-MUMBAI REGION SAMPLE QUESTION PAPER- TERM 2 SESSION: 2021-22 CLASS XI SUBJECT: PHYSICS SET: 1 MAX MARKS: 35 General Instructions: (i) (ii) (iii) (iv) (v) There are 12 questions in all. All questions are compulsory. This question paper has three sections: Section A, Section B and Section C. Section A contains three questions of two marks each, Section B contains eight questions of three marks each, Section C contains one case study-based question of five marks. There is no overall choice. However, an internal choice has been provided in one question of two marks and two questions of three marks. You have to attempt only one of the choices. You may use log tables if necessary but use of calculator is not allowed You may use the following values of physical constants, wherever necessary: R= 8.31 JK 1mol 1 kB= 1.38 10 23 J/K SECTION-A 1. Define coefficient of thermal conductivity. Write its SI unit. (2) 2. Write the equation of a progressive wave propagating along the positive x-direction, whose amplitude is 5 cm, frequency 250 Hz and velocity 500 m/s. (2) 3. Displacement versus time curve for a particle executing S.H.M is shown in Fig. Identify the points marked at which (i) velocity of the oscillator is zero, (ii) speed of the oscillator is maximum. (2) OR Why the amplitude of the vibrating pendulum should be small, while finding the value of acceleration due to gravity using the relation = 2 4. 5. 6. 7. l/g SECTION-B Define Young s Modulus. The length of a suspended wire increases by 10 4 of its original length when a stress of 107 N/m2 is applied on it. Calculate the Young s modulus of the material of the wire. (3) State Pascal s law in absence of gravity. In presence of gravity how does the Pascal s law get modified? (3) OR Find the expression for the excess pressure inside the soap bubble. If, at 50oC and 75 cm of mercury pressure, a definite mass of a gas is compressed (i) slowly, (ii) suddenly, then what will be the final pressure and temperature of the gas in each case if the final volume is one-fourth of the initial volume? (3) Define Coefficient of viscosity. Discuss the variation of fluid viscosity with temperature. (3) OR Describe the construction and working of Venturimeter. 8. A sphere of aluminum of 0.047 kg is placed for sufficient time in a vessel containing boiling water, so that the sphere is at 100oC. It is then immediately transferred to 0.14 kg copper calorimeter containing 0.25kg of water at 20oC. The temperature of water rises and attains a steady state at 23 oC. Calculate the specific heat capacity of aluminum. Given: specific heat capacity of water is 4186 J kg 1K 1 specific heat capacity of copper calorimeter is 386 J kg 1K 1 (3) 9. (a)Draw a graph to show the variation of P.E, K.E and total energy of a simple harmonic oscillator with displacement. (b)At what distance from the mean position is K.E in simple harmonic oscillator equal to P. E (3) 10. On the basis of Kinetic theory of gases, derive expression for the pressure exerted by idealgas. (3) 11. Calculate (i) r.m.s velocity, and (ii) mean kinetic energy of one gram molecule of hydrogen at STP. (Given, density of hydrogen at STP is 0.09 kg/m3) (3) SECTION-C 12. CASE STUDY: (5) When two sound waves of slightly different frequencies travelling along the same path in the same direction in a medium superpose upon each other, the intensity of resultant sound at any point in the medium rises and falls alternately with time. These periodic variations in the intensity of sound caused by the superposition of two sound waves of slightly different frequencies is called beats. The number of beats produced per second is called beat frequency. For beats to be audible, the difference in the frequency of the two sound waves should not exceed 10. QUESTIONS: (i) What is the frequency of beats when two sounds of frequencies 256Hz and 260 Hz are superposed on each other? (a) 12 Hz b)8 HZ c)10Hz d)4Hz (ii) Beats is a phenomenon that occur when frequencies of two harmonic waves are a) equal b) far away separated c)nearly same d) multiples of each other (iii)To hear the beats from two different sounds, which of the following condition should be met? (a) two sounds must have the frequencies in the audible range (b) difference in their frequencies must not be more than 10 Hz. (c) Amplitudes of the two sound waves should be equal (d) All the above conditions are necessary (iv) Each of the two strings of length 51.6 cm and 49.1cm are tensioned separately by 20 N force. Mass per unit length of both the strings is the same and equal to 1gm/m. When both the strings vibrate simultaneously, the number of beats is (a) 7 b)4 c)10 d) 1.5 (v) Which of the following is not the application of phenomenon of beats? (a) To produce low frequency oscillator in electronics (b) For detection of marsh gas in mines (c) for tuning musical instruments (d) none of these.

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