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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.

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