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PHYSOL EXAMINATION SERIES, Physical World, Units and Measurement, SUNDAY 20-06-2021 @ 7.00pm, , PES01, , TIME: 1 HOUR, MAXIMUM SCORE:30, , General Instructions to Students, ● There is a ‘cool-off time’ of 15 minutes in addition to maximum writing time, ● Use cool-off time to get familiarise with questions and their answers, ● Read questions and instructions carefully before answering, ● Calculations, figures, graphs should be shown in the answer sheet itself, ● You can write any number of questions fully or partially to get a maximum, score of 30, ● Electronic devices except non-programmable calculators are not allowed in the, examination, Questions from 1 to 4 carries 1 score, 1 Unit of thermodynamic temperature is ........................, , 1, , 2 Branch of physics that deals with the study of objects in rest and motion under 1, the action of force is ..................(Mechanics, Thermodynamics, Optics), 3 .....................is the strongest force among fundamental forces, , 1, , 4 Pick out the odd one from the following, a) kilogram b) ampere c) second d) impulse f) candela, , 1, , Questions from 5 to 8 carries 2 score, 5 Write any two limitations of dimensional analysis., , 2, , 6 Find the dimensional formula for, a), Force, b), Kinetic energy, c), Momentum, d), Impulse, , 1/2, 1/2, 1/2, 1/2, , 7 Give two examples for dimensionless quantities., , 2, , 8 Find the physical quantities with following dimensions, , 2, , -1, , -2, , a. [ML T ], , -3, , 0, , b.[ML T ], , Questions from 9 to 12 carries 3 score, 9 Using the method of dimension check whether the following equations are, dimensionally correct or not., a., , 1, s=ut + a t 2, 2, , 1, , PHYSOL-The solution for learning Physics, Prepared by Higher Secondary Physics Teachers Association Malappuram
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b., c., , v =u+at, , 1, 1, , v 2 −u=2 as, , 10 Give examples for following:, , a) A dimensionless and unit less physical quantity., b) A dimensionless physical quantity but having unit in SI system., c) Two physical quantities which have the same dimensions., , 3, , 11 The correctness of an equation X= a + bt +ct 2 is checked using the principle of, , homogeneity of dimensions, where ‘X’ is in meter and t in second. What will 3, be the dimension of a, b and c?, , 12 One student doubts whether the expression for kinetic energy as, , 1, 2, , or K . E= m v, , 2, , K . E=mv 3, , 3, , .How can you help him with the method of dimension., , Questions from 13 to 16 carries 4 score, 13 “Velocity can not be added to temperature”, a), This is in accordance with which law of physics? State the law., 2, b), Check the dimensional correctness of the equation PV =Fx where P, 2, is the pressure, V is the volume, F is the force and x is the displacement., Check whether the equation, 14, Where, , T =2 π, , √, , m is dimensionally correct., g, , 4, , T is the time period, m is the mass of the bob, g is the acceleration due to gravity., , 15 Check whether the equation mv2 = mgh is dimensionally consistent. Based on 4, the above equation justify the following statement. “A dimensionally correct, equation need not be actually an exact equation”, 16 Mechanical Power is represented by P=Fv+ A v 3 ρ where F is the force, v, is the velocity, A is the area and ρ is the density., a), The dimensional formula of power is ................, b), Check the dimensional correctness of the given equation, , 1, 3, , Questions 17 and 18 scores 5 each, 17 A boy recalls the relativistic Equation for mass almost correctly but forgets to, put the constant ‘c’ the velocity of light. If he write the equation, , m=, , m0, , √(1−v 2), , Guess where to put the missing c using dimensional formula, , 5, , analysis., , PHYSOL-The solution for learning Physics, Prepared by Higher Secondary Physics Teachers Association Malappuram
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18 If dimension of Young’s modulus is [ML-1T-2], test by method of dimensions, the correctness of the equation, , Mg l3, δ=, 4 b d3 Y, , 5, , where δ is the depression at middle of a beam of length l, breadth b, and, thickness d and M is the mass. It is placed over two knife edges symmetrically, and loaded at the middle by a weight W., , Best wishes to all, HSPTA MALAPPURAM, , PHYSOL-The solution for learning Physics, Prepared by Higher Secondary Physics Teachers Association Malappuram
