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ICSE Class X Sample / Model Paper 2023 : Physics

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MODEL QUESTION PAPER 1, 2022 23 I PUC PHYSICS (33) Time: 3 hours 15 minutes Max.Marks:70 General Instructions: (i) All parts are compulsory. (ii) Part A questions have to be answered in the first two pages of the answer booklet. For Part A questions, first written answer will be considered for awarding marks. (iii) Answers without relevant diagram/figure/circuit wherever necessary will not carry any marks. (iv) Direct answers to Numerical problems without detailed solutions will not carry any marks. PART A I. Pick the correct option among the four given options for ALL of the following questions 15 x 1 = 15 1. The method used to measure length indirectly A) decay of elementary particles B) parallax method C) gravitational method D) mass spectrograph 2. In the position time graph for a particle at rest, the graph is A) parallel to time axis B) perpendicular to time axis C) exponential D) inclined 3. The expression for centripetal acceleration is A) = 2 B) = 2 2 C) = 2 D) = 2 4. The inertia of a body depends on A) displacement B) velocity C) force D) mass 5. The force does not do work if angle between force and displacement is A) 0 B) 180 C) 90 D) 30 6. The example for body having variable axis of rotation A) ceiling fan C) potter s wheel D) spinning top B) 365 days C) 100 minutes D) 30 days B) 1 2 C) 1 2 D) 2 2 B) gaint wheel 7. The time period of polar satellite is about A) 200 minutes 8. The dimension of stress is A) FORUM OF P U COLLEGE PHYSICS LECTURES Page 1 9. The angle of contact is greater than 90 in A) water & glass interface B) mercury & glass interface C) milk & glass interface D) castor oil & glass interface 10. The melting point is the temperature at which the A) solid & liquid coexist B) solid & gas coexist C) gas & liquid coexist D) solid, liquid & gas coexist 11. The following gas is not a green house gas A) nitrus oxide B) ozone C) methane D) carbon monoxide 12. The thermodynamic variable internal energy is defined by using A) zeroth law of thermodynamics B) first law of thermodynamics C) second law of thermodynamics D) Newton s law 13. The number of degrees of freedom for diatomic gas molecule is A) 3 B) 5 C) 6 D) 7 14. Among the following, which is the characteristics of simple harmonic motion? A) It is periodic in nature. B) The time period and frequency are dependent of its amplitude. C) Acceleration is directed away from the mean position. D) It is non oscillatory motion. 15. The longitudinal wave can propagate in A) only solid B) only liquid C) only gas & solid D) solid, liquid & gas II. Fill in the blanks by choosing appropriate answer given in the brackets for ALL the following questions 5x1=5 (segment, force, critical velocity, temperature, gravitational pull) 16. A particle is said to be in translational equilibrium when net external on it is zero. 17. The minimum speed with which a body must be projected vertically upward so that it escapes the of the planet is escape speed. 18. For the streamline flow velocity of fluid must be less than 19. The velocity of the molecule increases with increase of . . 20. The region of the stationary wave between two consecutive nodes is called FORUM OF P U COLLEGE PHYSICS LECTURES . Page 2 PART B III. Answer any FIVE of the following questions 5 x 2 = 10 21. What are conserved quantities? Give one example. 22. Distinguish between path length and displacement. 23. State and explain triangle law of vector addition. 24. What are elastic and inelastic collisions? 25. Write the expression for distance of centre of mass of two particles system and explain the terms. 26. State the law of orbits and law of periods. 27. What is heat pump? Give its schematic representation. 28. What is Avogadro s number? Write its value. 29. Define beat period. Mention one use of beats. PART C IV. Answer any FIVE of the following questions 5 x 3 = 15 1 30. Deduce kinetic energy, = 2 2 by dimensional analysis, where the symbols have usual meanings. 31. Derive the relation between linear velocity and angular velocity. 32. Mention any three advantages of friction. 33. A rain drop of mass 2 g falling from a height 1 km. If it hits the ground with a speed of 60 ms-1, calculate the work done by the gravitational force. 34. Show that torque is equal to the rate of change of angular momentum of a particle. 35. Draw stress strain curve. Indicate yield point and fracture point. 36. State and explain Bernoulli s theorem. From which principle theorem follows? 1 37. Derive = . 38. Obtain Newton s formula for speed of sound in air. FORUM OF P U COLLEGE PHYSICS LECTURES Page 3 PART D V. Answer any THREE of the following questions 3 x 5 = 15 39. What is velocity time graph? Derive 2 = 0 2 + 2 using velocity time graph. 40. State Newton s second law. Obtain = . 41. Show that the total mechanical energy of a body falling freely under gravity is conserved. 42. i. What is acceleration due to gravity? 1 ii. Why gravitational constant is called universal gravitational constant? 1 iii. Derive the relation between acceleration due to gravity and universal gravitational constant. 3 43. Explain the working of Carnot heat engine with a P V diagram. 44. i. What is free oscillation? 1 ii. Write the expression for the period of oscillation of a mass attached to a horizontal spring and explain the terms. 2 iii. Where are velocity of particle executing S. H. M. maximum and what is its value? 2 VI. Answer any TWO of the following questions 2 x 5 = 10 45. A cricket ball is thrown at a speed of 80 ms -1 in a direction 60 above the horizontal. Calculate a) the maximum height reached by the ball. b) the distance from the thrower to the point where the ball returns to the same level c) the time taken by the ball to return to the same level. 46. A homogeneous metal bar of uniform cross section 80 cm long and 5 kg in mass supported on two knife edges placed 10 cm from each end. Find the reactions at the knife edges. 47. A copper block of mass 3 kg is at temperature of 30 is heated in a furnace to a temperature of 500 . Calculate the amount of heat gained by the copper block. Now the copper block is placed on a large ice block, determine the maximum amount of ice that can melt. Given specific heat of copper is 390 Jkg-1K-1, heat of fusion of water is 3.35x105 Jkg-1. 48. A wire stretched between two rigid supports vibrates in its fundamental mode with frequency of 45 Hz. The mass of the wire is 3.5x10 -2 kg and its linear density is 4x10-2 kgm-1. Calculate a) the speed of transverse wave in the string and b) the tension in the string. *********************************** FORUM OF P U COLLEGE PHYSICS LECTURES Page 4 MODEL QUESTION PAPER 2, 2022 23 I PUC PHYSICS (33) Time: 3 hours 15 minutes Max.Marks:70 General Instructions: (i) All parts are compulsory. (ii) Part A questions have to be answered in the first two pages of the answer booklet. For Part A questions, first written answer will be considered for awarding marks. (iii) Answers without relevant diagram/figure/circuit wherever necessary will not carry any marks. (iv) Direct answers to Numerical problems without detailed solutions will not carry any marks. PART A I. Pick the correct option among the four given options for ALL of the following questions 15 x 1 = 15 1. The SI unit for plane angle is A) degree B) radian C) steradian D) radian-1 C) displacement D) acceleration 2. The slope of position time graph gives A) velocity B) position 3. The unit vector along the x and z axis are respectively A) and B) and C) and D) none of these 4. When a stationary bus suddenly starts, a passenger on it falls in the backward direction. This is due to A) inertia of rest B) inertia of motion C) inertia of direction D) the bus pushes him in the forward direction 5. Einstein s mass energy relation is A) = B) = 2 C) = 2 D) = 2 2 6. Opening or closing of a lid of a bottle by turning it with our fingers is an example of A) couple B) energy C) force D) angular momentum 7. Polar satellites are not used for the purpose of A) remote sensing B) meteorology C) environmental studies D) telecommunication FORUM OF P U COLLEGE PHYSICS LECTURES Page 5 8. The ratio of change in length to the original length is called A) Young s modulus B) shear modulus C) longitudinal strain D) Poisson s ratio 9. Free liquid drops and bubbles are spherical (if effects of gravity is neglected) is due to A) Surface tension B) Pressure C) Viscosity D) Torque 10. Land breeze is an example for: A) Thermal conduction B) Thermal radiation C) Natural convection D) Black body radiation 11. The change from solid state to vapour state without passing through the liquid state is called A) fusion B) regelation C) melting D) sublimation 12. The first law of thermodynamics signifies A) law of conservation of charge B) law of conservation of momentum C) law of conservation of energy D) law of conservation of mass 13. The average kinetic energy of a gas molecule is directly proportional to: A) Volume of the gas B) pressure of the gas C) Absolute temperature of the gas D) mass of the gas 14. The length of second s pendulum is A) 2 m B) 1 cm C) 1 m D) 1 km 15. In a standing wave the points at which amplitude is the largest is known as A) node B) crest C) rarefaction D) antinodes II. Fill in the blanks by choosing appropriate answer given in the brackets for ALL the following questions 5x1=5 (beats, impulsive force, decreases, zero, large) 16. A large force acting for a short time to produce finite change in momentum is called___________. 17. The force of attraction due to a hollow spherical shell of uniform density, on a point mass kept inside it is_______ 18. Viscosity of liquid with temperature. FORUM OF P U COLLEGE PHYSICS LECTURES Page 6 19. According to kinetic theory of gases, a given amount of gas contains_____ number of molecules. 20. Artists use phenomenon of ________ while tuning their musical instruments with each other. PART B III. Answer any FIVE of the following questions 5 x 2 = 10 21. What are conserved physical quantities? Give an examples. 22. Define stopping distance. Give its importance. 23. Write the equation of path of the projectile. Give its name. 24. What is centripetal force? Specify its direction. 25. State and explain parallel axes theorem of moment of inertia. 26. Give two examples for weightlessness. 27. What is refrigerator? Give its schematic representation. 28. Mention the expression for mean free path. Explain the terms. 29. List the two differences between transverse wave and longitudinal wave. PART C IV. Answer any FIVE of the following questions 5 x 3 = 15 30. Name any three sources of systematic errors. 31. Find the magnitude of resultant of two vectors acting at a point by making an angle between them. 32. List any two advantages and one disadvantage of friction. 33. A police officer fires a bullet of mass0.05kg with kinetic energy of 1000 J on a soft ply wood. It emerges with 10% of its initial kinetic energy. What is the emergent speed of the bullet? 34. State law of conservation of angular momentum. Give two examples. 35. Define Young s modulus. Write the expression for Young s modulus of the material of a wire and explain the terms. 36. Distinguish between stream line flow and turbulent flow of fluids. 37. Show that for an ideal gas coefficient of volume expansion at constant pressure is inversely 1 proportional to temperature. ( = ) 38. Write the displacement relation (equation) of a progressive wave travelling in the negative direction of x axis with initial phase . Explain the terms. FORUM OF P U COLLEGE PHYSICS LECTURES Page 7 PART D V. Answer any THREE of the following questions 3 x 5 = 15 39. What is velocity time graph? Derive 2 = 0 2 + 2 using v t graph. 40. State Newton s second law of motion. Derive = . 41. Show that in a completely inelastic collision loss in kinetic energy is a positive quantity. 42. i. Define orbital speed of a satellite. ii. Derive an expression for total energy of a satellite. iii. What is the value of orbital speed on the surface of earth? 1 3 1 43. What is an isothermal process? Derive the expression for work done in an isothermal process. 44. i. Define simple harmonic motion. ii. Derive the expression for velocity and acceleration in S. H. M. iii. What is resonance? 1 3 1 VI. Answer any TWO of the following questions 2 x 5 = 10 45. The position of a particle is given by = 3 + 2 2 + 5 , where in seconds and coefficients have the proper units for to be in metres. Find (a) ( ) and ( ) of the particle. Find the magnitude and direction of ( ) at = 1 s. 46. A solid cylinder of mass 20 kg rotates about its axis with angular velocity 100 rads -1. The radius of the cylinder is 0.25 m. What is the kinetic energy associated with the rotation of the cylinder? What is the magnitude of angular momentum of the cylinder about its axis? 47. Calculate the amount of heat required to convert 3 kg of ice at 12 into a steam at 100 . Given specific heat capacity of ice is 2100 Jkg-1K-1, specific heat capacity of water is 4200 Jkg-1K-1, latent heat of fusion of ice is 3.35x105 Jkg-1 and latent heat of steam is 2.256x106 Jkg-1. 48. A train standing at the outer signal of railway station blows a whistle of frequency 400 Hz. In still air. What is the frequency of the whistle for a platform observer when the train a) approaches with a speed of 10 ms-1? b) recedes from the platform with a speed of 10 ms-1? Given speed of sound in still air is 340 ms-1. *********************************** FORUM OF P U COLLEGE PHYSICS LECTURES Page 8 MODEL QUESTION PAPER 3, 2022 23 I PUC PHYSICS (33) Time: 3 hours 15 minutes Max.Marks:70 General Instructions: (i) All parts are compulsory. (ii) Part A questions have to be answered in the first two pages of the answer booklet. For Part A questions, first written answer will be considered for awarding marks. (iii) Answers without relevant diagram/figure/circuit wherever necessary will not carry any marks. (iv) Direct answers to Numerical problems without detailed solutions will not carry any marks. PART A I. Pick the correct option among the four given options for ALL of the following questions 15 x 1 = 15 1. The number of significant figures in 0.001020 m. A) 3 B) 4 C) 6 D) 7 2. The acceleration of a particle moving with uniform velocity 10 ms-1 for 2 s is A) 10 ms-2 B) 5 ms-2 D) 20 ms-2 C) 0 3. Expression for centripetal acceleration of a particle moving with uniform speed and in a circular path of radius is A) = 2 B) = 2 2 C) ) = 2 D) ) = 2 4. Dust in duster cleaned by hitting it on wall or ground. Dust removed out of duster due to A) inertia of rest B) inertia of motion C) kinetic energy of particle increase D) kinetic energy of particle decreases 5. The commercial unit of electrical energy equal to A) kilowatt B) horse power C) kilowatt hour D) joule 6. Dimensional formula for which of the following pair of physical quantities are same? A) Work & power B) Angular momentum & kinetic energy C) Torque & work D) angular momentum & force. 7. The period of revolution of Geo stationery satellite equal to A) one day B) one week C) one month D) one year FORUM OF P U COLLEGE PHYSICS LECTURES Page 9 8. Young s modulus inversely proportional to A) Lateral strain B) Bulk modulus C) longitudinal stress D) longitudinal strain 9. The instrument used to measure Gauge pressure is A) Thermometer B) Open tube manometer C) multi meter D) Barometer 10. Example for Convection mode of heat transfer is A) Land breeze B) Trade wind C) Sea breeze D) all the 3 options A,B and C are correct 11. Body temperature of normal human beings equal to 37 . Body temperature of normal human beings in Fahrenheit scale equal to A) 98.6 B) 310 C) 37 D)103.6 12. Heat energy supplied to a system, increase in internal energy and = work done by system then, the correct relation for isochoric process is A) = + B) = C) = D) = 13. The real gases approach ideal gas behaviour at A) Low pressure and high temperature B) High Pressure and high temperature C) High pressure and low temperature D) Low pressure and low temperature 14. Planets rotates about their own axis and revolve around Sun, their motion is A) Periodic and Oscillatory B) not periodic and not oscillatory C) Periodic but not Oscillatory D) Simple Harmonic motion 15. Electromagnetic waves are A) Longitudinal requires medium for their propagation B) Longitudinal do not require any medium for their propagation. C) Transverse do not require any medium for their propagation. D) Transverse requires medium for their propagation. II. Fill in the blanks by choosing appropriate answer given in the brackets for ALL the following questions 5x1=5 (Isothermal, number density, Pascal s law, Poles, law of conservation of momentum) FORUM OF P U COLLEGE PHYSICS LECTURES Page 10 16. When net force acting on system equal to zero, total linear momentum of system is conserved . This statement is_____________________ 17. Acceleration due to gravity on earth at _____ is greater than that in equator 18. Hydraulic lift work according to _________________ 19. The mean free path of a gas molecule inversely proportional to_______ 20. According to Newton, the propagation of sound in air is _______process. PART B III. Answer any FIVE of the following questions 5 x 2 = 10 21. Name the forces that exist and dominant between i) Two proton within nucleus ii) Two proton separated by distance 1 m. 22. Write any difference between speed and velocity. 23. Define i) null vector and ii) unit vector 24. Define elastic and inelastic collisions. 25. Write the condition for equilibrium of a rigid body. 26. Write the expression for acceleration due to gravity at depth d from earth surface and mention the terms. 27. State i) Zeroth law and ii) second law of thermodynamics. 28. State and explain law of equipartition of energy. 29. What is Doppler s effect in sound? Mention one use of it. PART C IV. Answer any FIVE of the following questions 5 x 3 = 15 1 30. Check the correctness of equation, = 0 + 2 2 using dimensional analysis. 31. Derive the expression for maximum height of a projectile. 32. Write two advantage and one disadvantage of friction. 33. A metal ball of mass 10 kg fall on ground from a height 25 m. Calculate its kinetic energy when it just touches the ground. (g = 9.8 ms-2) 34. Obtain the expression for position of centre of mass of two particle system. 35. Draw stress-strain curve for a metal like steel and identity proportionality limit and yield point on it. 36. Write Bernoulli s formula and explain the terms in it. What is the use of venturi metre? 37. What is thermal radiation? Mention one use and one disadvantage of greenhouse effect. 38. What is Simple harmonic motion? Mention its two properties. FORUM OF P U COLLEGE PHYSICS LECTURES Page 11 PART D V. Answer any THREE of the following questions 3 x 5 = 15 39. What is velocity time graph? Derive 2 0 2 = 2 using v t graph. 40. State and explain Newton s II law of motion and hence prove = . 41. Illustrate the law of conservation energy for a freely falling body of mass and falling from height . 42. i. State Kepler s law of orbit of planetary motion. 1 ii. State and explain Kepler s law of area of planetary motion. 2 iii. State and explain Kepler s law of periods of planetary motion. 2 43. With the help of P V diagram explain the working of Carnot s cycle of heat engine. 44. i. Derive an expression for period of oscillation of spring. 3 ii. What is damped oscillation? 1 iii. What is resonance in simple harmonic motion? 1 VI. Answer any TWO of the following questions 2 x 5 = 10 45. A projectile projected with velocity 49 ms-1 with angle of projection 30 . Find its time of flight and range. 46. A cord of negligible mass is wound round and the rim of a fly wheel (Disc) of mass 20 kg and radius 20 cm A steady pull of 25 N is applied on the cord to drag it downward. Fly wheel is mounted on a horizontal axle with frictionless bearings. Find a) the angular acceleration of the wheel and b) the work done by the pull, when 2 m of the cord is unwound. 47. A sphere of aluminium of 0.047 kg placed for sufficient time in a vessel containing boiling water, so that the sphere is at 100 . It is then immediately transferred to 0.14 kg copper calorimeter containing 0.25 kg of water at 20 . The temperature of water rises and attains a steady state at 23 . Calculate the specific heat capacity of aluminium. (Specific heat of water is 4186 Jkg-1K-1, specific heat of copper is 386 Jkg-1K-1) 48. A wave travelling along a string described by ( , ) = 0.005 sin(80.0 3.0 ), in which numerical constants are in S. I. units. Calculate a) amplitude d) wavelength and b) period of wave e) speed of propagation of wave. c) frequency *********************************** FORUM OF P U COLLEGE PHYSICS LECTURES Page 12 Page 13 MODEL QUESTION PAPER 4, 2022 23 I PUC PHYSICS (33) Time: 3 hours 15 minutes Max.Marks:70 General Instructions: (i) All parts are compulsory. (ii) Part A questions have to be answered in the first two pages of the answer booklet. For Part A questions, first written answer will be considered for awarding marks. (iii) Answers without relevant diagram/figure/circuit wherever necessary will not carry any marks. (iv) Direct answers to Numerical problems without detailed solutions will not carry any marks. PART A I. Pick the correct option among the four given options for ALL of the following questions 15 x 1 = 15 1. Which of the following ratios express pressure A) force/area B) energy/volume C) force/ volume D) work/area 2. Relation between initial velocity ( 0 ), final velocity ( ), acceleration ( ) and time ( ) is A) = 0 B) 0 = + C) = ( 0 ) D) 0 = + 3. If resultant of two vectors and is | - | then angle between and is A) 0 B) 45 C) 90 D) 180 4. If external force on a body is zero, then its A) displacement is zero B) velocity is zero C) acceleration is zero D) none of these 5. When a body is thrown vertically upwards, work done by gravity is A) positive B) zero C) negative D) can t predict 6. Torque acting on a body is rotational analogue of A) mass B) force C) velocity D) kinetic energy 7. Kepler s law of areas is the law of conversation of A) linear momentum B) energy C) angular momentum D) mass 8. Young s modulus of elasticity of a perfectly rigid body is A) unity B) zero FORUM OF P U COLLEGE PHYSICS LECTURES C) infinity D) none of these Page 13 Page 14 9. The upward lift of an aeroplane is due to a phenomenon described by A) Archimede s principle B) Pascal s law C) buoyancy principle D) Bernoulli s principle 10. For a perfectly black body at temperature and the wavelength emitted is maximum( ) then A) 1 B) C) 2 D) is independent of temperature 11. The amount of heat conducted through a metal rod is directly proportional to A) time during which heat flows B) area of cross section C) temperature gradient D) all of these 12. The efficiency of heat engine working between 1 & 2 ( 1 > 2 ) is given by A) 1 1 2 B) 1 2 1 C) 1 + 2 D) 2 C) 5/7 D) 3/5 1 1 13. Ratio of specific heat for a mono atomic gas is A) 7/5 B) 5/3 14. In a simple harmonic motion the particle is A) always accelerated B) always retarded C) alternately accelerated and retarded D) neither accelerated nor retarded 15. The quantity which does not change, when sound enters from one medium to another is A) wavelength B) speed C) frequency D) amplitude II. Fill in the blanks by choosing appropriate answer given in the brackets for ALL the following questions 5x1=5 (mass, directly, Doppler s effect, Reynold s number, momentum) 16. Recoiling of gun explains law of conservation of . 17. The value of acceleration due to gravity is independent of ________ of the body. 18. _________ determines nature of flow of fluid in a pipe. 19. Average kinetic energy of gas is ________ proportional to temperature of the gas. 20. The apparent change in observed frequency of sound due to relative motion between the source and listener is called __________. FORUM OF P U COLLEGE PHYSICS LECTURES Page 14 Page 15 PART B III. Answer any FIVE of the following questions 5 x 2 = 10 21. What are conservative laws? Give an example. 22. Draw position time graph for a body moving with increasing velocity. 23. Explain scalar product of two vectors with an example. 24. Show that power is equal to dot product of force and velocity. 25. Differentiate between centre of mass and centre of gravity. 26. Mention two applications of polar satellites. 27. State first law of thermodynamics. Mention its significance. 28. What are degrees of freedom of gas molecule? Mention an expression relating degrees of freedom and ratio of specific heats. 29. Mention two characteristics of simple harmonic motion. PART C IV. Answer any FIVE of the following questions 5 x 3 = 15 30. Explain parallax method of determining large distances. 31. Derive an expression for magnitude of resultant of two concurrent vectors. 32. State laws of friction. 33. A man pushes a roller with a force of 50 N through a distance of 20 m. Calculate the work done by him if the handle of the roller is inclined at 60 with the ground. 34. State and explain parallel axes theorem. 35. Derive an expression for young s modulus in the case of a cylindrical wire stretched by mass. 36. State Pascal s law. Mention two applications of Pascal s law. 1 37. Derive = for an ideal gas. 38. Mention three differences between progressive waves and stationary waves. FORUM OF P U COLLEGE PHYSICS LECTURES Page 15 Page 16 PART D V. Answer any THREE of the following questions 3 x 5 = 15 39. Derive the expression, 2 = 0 2 + 2 using velocity time graph. 40. State Newton s second law of motion and hence arrive at the expression = , where symbols have their usual meanings. 41. State the law of conservation of mechanical energy. Prove it in the case of a freely falling body. 42. i. State and explain Newton s law of gravitation. ii. Derive the relation between and 2 3 43. Derive an expression for work done in an isothermal process. 44. i. Derive an expression for potential energy of a particle executing SHM 3 ii) At what positions potential energy of a particle executing SHM is maximum and minimum? 2 VI. Answer any TWO of the following questions 2 x 5 = 10 45. The ceiling of a long hall is 20 m high. A ball is thrown with a speed of 39.2 ms -1. Calculate a) angle of projection b) maximum horizontal distance covered by the ball such that the ball moves without hitting ceiling (g=9.8 ms-2) 46. A solid cylinder of mass 20 kg rotates about its axis with angular speed of 100 rads -1. The radius of cylinder is 0.25 m. a) What is the kinetic energy associated with rotation of the cylinder? b) What is the magnitude of momentum of cylinder about its axis? 47. A brass boiler has a base area 0.15 m2 and thickness 1.0 cm. It boils the water at a rate of 6.0 kg per minute when placed on a gas stove. Estimate the temperature of part of the flame in contact with boiler. ( Thermal conductivity of brass = 109 Wm -1K-1 and heat of vaporization of water = 2256x103 Jkg-1) 48. A train, standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air. What is the frequency of whistle for an observer on the platform when the train a) approaches him with a speed of 10 ms-1? b) recedes from him with a speed of 10 ms-1? (The speed of sound in still air is 340 ms-1) ********************************* FORUM OF P U COLLEGE PHYSICS LECTURES Page 16 Page 17 ANSWERS MODEL QUESTION PAPER 1 Q. NO. ANS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 B A A D C D C B B A D B B A D Q. NO. 16. Force Q. NO. 17. Gravitational pull Q. NO. 18. Critical velocity Q. NO. 19. Temperature Q. NO. 20. Segment MODEL QUESTION PAPER 2 Q. NO. ANS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 B A B A C A D C A C D C C C D Q. NO. 16. Impulsive force Q. NO. 17. Zero Q. NO. 18. Decreases Q. NO. 19. Large Q. NO. 20. Beats MODEL QUESTION PAPER 3 Q. NO. ANS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 B C D A C C A D B D A C A C C Q. NO. 18. Pascal s law Q. NO. 19. Number density Q. NO. 20. Isothermal Q. NO. 16. Law of conservation of momentum Q. NO. 17. Pole MODEL QUESTION PAPER 4 Q. NO. ANS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 A A D C C B C C D B D B B C C Q. NO. 16. Momentum Q. NO. 17. Mass Q. NO. 18. Reynold s number FORUM OF P U COLLEGE PHYSICS LECTURES Q. NO. 19. Directly Q. NO. 20. Doppler effect Page 17

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