Page 1 SESSION ENDING EXAMINATION 2012 CLASS: Xl PHYSICS Max marks:70 > Allquestions are compulsory, There is no overall choice. However, an Internal choice one question of two marks, one question of three Time: 3h.s has been provided ln marks and all three questions of five marks each. Question numbers 1 to I are very mark each. Question numbers g to 18 are marks each. snon answer type questions, carrying one short answer type questions, carrying two Question numbers 19 lo 27 are also short answer type questions, carrying three marks each. Question numbers 28 to 30 are long answer type questions, carrying five marks each. Two bodies havinS different masses have the same linear momentum. Which 1 one ofthem will move faster? 1. 2. 5. State the first law of Thermodvnamics. Name the physical quantity whose unit in Sl system is Newton second. The length of a seconds pendulum is ,l' .lfthe length is halved find its new time period The angular speed of inner layer of the whirl wind(Tornado) is alarmingly high. Write the number of degrees offreedom for molecules ofa mono atomic gas. Absolute temperature of a gas is increased four times. What will be the increase in the rms velocity of its molecules? The momentum of an object is doubled. How does its kinetic energy change? I 7 1 'L 1 L 7. 8. Page 2 SESSION ENDING EXAMINATION 2012 CLASS: Xl PHYSICS Max marks:70 > Allquestions are compulsory, There is no overall choice. However, an Internal choice one question of two marks, one question of three Time: 3h.s has been provided ln marks and all three questions of five marks each. Question numbers 1 to I are very mark each. Question numbers g to 18 are marks each. snon answer type questions, carrying one short answer type questions, carrying two Question numbers 19 lo 27 are also short answer type questions, carrying three marks each. Question numbers 28 to 30 are long answer type questions, carrying five marks each. Two bodies havinS different masses have the same linear momentum. Which 1 one ofthem will move faster? 1. 2. 5. State the first law of Thermodvnamics. Name the physical quantity whose unit in Sl system is Newton second. The length of a seconds pendulum is ,l' .lfthe length is halved find its new time period The angular speed of inner layer of the whirl wind(Tornado) is alarmingly high. Write the number of degrees offreedom for molecules ofa mono atomic gas. Absolute temperature of a gas is increased four times. What will be the increase in the rms velocity of its molecules? The momentum of an object is doubled. How does its kinetic energy change? I 7 1 'L 1 L 7. 8. 9. 10. 11. State Hooke's law. Draw the labelled stress- st.ain graph for a cylindrical specimen subjected to a gradually increasing stress, A simple harmonic motion is represented by y(t)=5 cos(10t+0.2) y in meters and't'in seconds .Calculate its amplitude ,initia I phase and frequency. A 40 kg shell is flying at 60 m/s. When it explodes, its onc : rft of 10 kg stops, while the remaining part Jlies on. Find the velocity of the l. rr. Obtain an expression for kinetic energy of a rotating body. Deduce graphically the equation x{t).x(o)=Vo t+%at7 for uniformly accelerated linear motion. A carnot's engine absorbs 20001 of heat from the source of a heat engine at 2270c and rejects 1200.1 of heat during each cycle to the sink. Calculate a) Efficiency ofthe [ngine b) TemDe.ature of the sink Distlnguish between extensive and intensive variables with one example fol each At what altitude above the earth's surface would the acceleration due to gravity be half its value at the earth's surface{R=6400 km} (oR) The acceleration due to gravity at a depth'd' reduces by 25% from the value at the surface. Calculate the value of'd' if radius of earth is 6400 km. 2 2 t2. 14. f7. Write the expression for potential energy stored in a spring of spring constant 'k'. Sketch the graph showing the variation of KE, PE and total energy of an elastic spring with displacement, Prove that the oscillations of a mass 'm' attached to a spring are simple harmontc. State the laws of limiting friction. The coefficient of static fiction between block A and the tableis o.2.what would be the maximum mass of block B so 18. 19. Page 3 SESSION ENDING EXAMINATION 2012 CLASS: Xl PHYSICS Max marks:70 > Allquestions are compulsory, There is no overall choice. However, an Internal choice one question of two marks, one question of three Time: 3h.s has been provided ln marks and all three questions of five marks each. Question numbers 1 to I are very mark each. Question numbers g to 18 are marks each. snon answer type questions, carrying one short answer type questions, carrying two Question numbers 19 lo 27 are also short answer type questions, carrying three marks each. Question numbers 28 to 30 are long answer type questions, carrying five marks each. Two bodies havinS different masses have the same linear momentum. Which 1 one ofthem will move faster? 1. 2. 5. State the first law of Thermodvnamics. Name the physical quantity whose unit in Sl system is Newton second. The length of a seconds pendulum is ,l' .lfthe length is halved find its new time period The angular speed of inner layer of the whirl wind(Tornado) is alarmingly high. Write the number of degrees offreedom for molecules ofa mono atomic gas. Absolute temperature of a gas is increased four times. What will be the increase in the rms velocity of its molecules? The momentum of an object is doubled. How does its kinetic energy change? I 7 1 'L 1 L 7. 8. 9. 10. 11. State Hooke's law. Draw the labelled stress- st.ain graph for a cylindrical specimen subjected to a gradually increasing stress, A simple harmonic motion is represented by y(t)=5 cos(10t+0.2) y in meters and't'in seconds .Calculate its amplitude ,initia I phase and frequency. A 40 kg shell is flying at 60 m/s. When it explodes, its onc : rft of 10 kg stops, while the remaining part Jlies on. Find the velocity of the l. rr. Obtain an expression for kinetic energy of a rotating body. Deduce graphically the equation x{t).x(o)=Vo t+%at7 for uniformly accelerated linear motion. A carnot's engine absorbs 20001 of heat from the source of a heat engine at 2270c and rejects 1200.1 of heat during each cycle to the sink. Calculate a) Efficiency ofthe [ngine b) TemDe.ature of the sink Distlnguish between extensive and intensive variables with one example fol each At what altitude above the earth's surface would the acceleration due to gravity be half its value at the earth's surface{R=6400 km} (oR) The acceleration due to gravity at a depth'd' reduces by 25% from the value at the surface. Calculate the value of'd' if radius of earth is 6400 km. 2 2 t2. 14. f7. Write the expression for potential energy stored in a spring of spring constant 'k'. Sketch the graph showing the variation of KE, PE and total energy of an elastic spring with displacement, Prove that the oscillations of a mass 'm' attached to a spring are simple harmontc. State the laws of limiting friction. The coefficient of static fiction between block A and the tableis o.2.what would be the maximum mass of block B so 18. 19. that the twoblocks do not move.(The string and the pulley are assumed to be smoothand massless, C=1om/s'z ) 20. Explain with a diagram, how banking provides the centripetal force necessary 3 for a car moving along a circular path. Hence derive the expression for maximum veloclty with which a vehicle takes a safe turn on a banked road 21. The distance of two planets from sun are 1013 and 1012 m respectively. 3 Find the ratio of lTime period 2.speed of the two planets 22. The velocity of water waves may depend on their wavelength ,\,density of 3 water p and acceleration due to gravity'g'. Find the relation between these quantities by the method of dimensions. 23. State and explain perpendicular axis theorem. The moment of inertia of a disc 3 of mass'M' and radius 'R' about any of its diameter is lvR'?A.Find its moment of inertia about an axis normal to the disc and passing through a point on its edge. 2+ a) State Weins displacement law. 3 b)The wavelength corresponding to E.u, for moon is 14 microns. Estimate the temperature of moon(b=2.884 X 1O3 km) (oR) a) Define coefflcient of thermal conductivity. b) Describe an experimeni to find the thermal conductivity of a good conductor 25. Write the characteristics of elastic collision. Prove that in one dimensional 3 elastic collision the relative velocity of separation is numerically equal to the relatlve velocity of approach. 26, The motion of a particle along a straight line is described by the equation 3 x=6+4t z-tawhere x is in meters and t in seconds. Find the position, velocity and acceldhtion ofthe particle at t=2 seconds. 27. Obtain an expression for pressure exerted by an ideal gas, using the postulates 3 of k;netic theory of gases. Page 4 SESSION ENDING EXAMINATION 2012 CLASS: Xl PHYSICS Max marks:70 > Allquestions are compulsory, There is no overall choice. However, an Internal choice one question of two marks, one question of three Time: 3h.s has been provided ln marks and all three questions of five marks each. Question numbers 1 to I are very mark each. Question numbers g to 18 are marks each. snon answer type questions, carrying one short answer type questions, carrying two Question numbers 19 lo 27 are also short answer type questions, carrying three marks each. Question numbers 28 to 30 are long answer type questions, carrying five marks each. Two bodies havinS different masses have the same linear momentum. Which 1 one ofthem will move faster? 1. 2. 5. State the first law of Thermodvnamics. Name the physical quantity whose unit in Sl system is Newton second. The length of a seconds pendulum is ,l' .lfthe length is halved find its new time period The angular speed of inner layer of the whirl wind(Tornado) is alarmingly high. Write the number of degrees offreedom for molecules ofa mono atomic gas. Absolute temperature of a gas is increased four times. What will be the increase in the rms velocity of its molecules? The momentum of an object is doubled. How does its kinetic energy change? I 7 1 'L 1 L 7. 8. 9. 10. 11. State Hooke's law. Draw the labelled stress- st.ain graph for a cylindrical specimen subjected to a gradually increasing stress, A simple harmonic motion is represented by y(t)=5 cos(10t+0.2) y in meters and't'in seconds .Calculate its amplitude ,initia I phase and frequency. A 40 kg shell is flying at 60 m/s. When it explodes, its onc : rft of 10 kg stops, while the remaining part Jlies on. Find the velocity of the l. rr. Obtain an expression for kinetic energy of a rotating body. Deduce graphically the equation x{t).x(o)=Vo t+%at7 for uniformly accelerated linear motion. A carnot's engine absorbs 20001 of heat from the source of a heat engine at 2270c and rejects 1200.1 of heat during each cycle to the sink. Calculate a) Efficiency ofthe [ngine b) TemDe.ature of the sink Distlnguish between extensive and intensive variables with one example fol each At what altitude above the earth's surface would the acceleration due to gravity be half its value at the earth's surface{R=6400 km} (oR) The acceleration due to gravity at a depth'd' reduces by 25% from the value at the surface. Calculate the value of'd' if radius of earth is 6400 km. 2 2 t2. 14. f7. Write the expression for potential energy stored in a spring of spring constant 'k'. Sketch the graph showing the variation of KE, PE and total energy of an elastic spring with displacement, Prove that the oscillations of a mass 'm' attached to a spring are simple harmontc. State the laws of limiting friction. The coefficient of static fiction between block A and the tableis o.2.what would be the maximum mass of block B so 18. 19. that the twoblocks do not move.(The string and the pulley are assumed to be smoothand massless, C=1om/s'z ) 20. Explain with a diagram, how banking provides the centripetal force necessary 3 for a car moving along a circular path. Hence derive the expression for maximum veloclty with which a vehicle takes a safe turn on a banked road 21. The distance of two planets from sun are 1013 and 1012 m respectively. 3 Find the ratio of lTime period 2.speed of the two planets 22. The velocity of water waves may depend on their wavelength ,\,density of 3 water p and acceleration due to gravity'g'. Find the relation between these quantities by the method of dimensions. 23. State and explain perpendicular axis theorem. The moment of inertia of a disc 3 of mass'M' and radius 'R' about any of its diameter is lvR'?A.Find its moment of inertia about an axis normal to the disc and passing through a point on its edge. 2+ a) State Weins displacement law. 3 b)The wavelength corresponding to E.u, for moon is 14 microns. Estimate the temperature of moon(b=2.884 X 1O3 km) (oR) a) Define coefflcient of thermal conductivity. b) Describe an experimeni to find the thermal conductivity of a good conductor 25. Write the characteristics of elastic collision. Prove that in one dimensional 3 elastic collision the relative velocity of separation is numerically equal to the relatlve velocity of approach. 26, The motion of a particle along a straight line is described by the equation 3 x=6+4t z-tawhere x is in meters and t in seconds. Find the position, velocity and acceldhtion ofthe particle at t=2 seconds. 27. Obtain an expression for pressure exerted by an ideal gas, using the postulates 3 of k;netic theory of gases. 28. a) Derive an expression for the height 'h' of a liquid of density 'p' rising 5 through a capillary tube of radlus 'a' b) small drops of water are spherical ,while large ones are flat . Explain (oR) a) What is meant by terminal velocity b) Write an expression forviscous force on the basis of Stoke's formula c) Hence derive an expression for terminal velocity of a spherical body in terms of radius of the body, density of the liquid and object and viscosity ofthe liquid. 29. (a) show that the path followed by a projectile is parabolic, when it is 5 projected at an angle'0'with the horizontal. b) Prove that the maximum horizontal range is four times the maximum height attained by a projectile, which is fired along the requiled oblique direction. (oR) a) State parallelogram law of vector addition b) Find the magnitude and direction of the resultant of two vectors 'A' & 'B' inclined at an argle '0' c) An object of mass'm' is moving in an circular path of radius 'R'with linear velocity 'v' . Obtain an expression for 'v' in terms of w. 30. a) Write NeMon's formula fof speed of sound in a gaseous medium. What is 5 the correction applied by Laplace and Why? b) At what temperature will the velocity of sound be double its value at 273K, {oR) a) What is Doppler Effect b) Derive an expression of apparent frequency of sound, when both the source and the observer are in motion. c) A train standing at the outer signal of railway station blows a,lshistle of frequency 400 Hz in still air. Find the frequency of the whistle when the train approaches the platform with a speed of mrn/s.(speed of sound in stillair= 340 m/s.)Read More

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