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ISC Class XI Final Term 2025 : Physics (St. Joans School, Kolkata)

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St. Joan's School Final Term Examination-2024-2025 ClassXI Physics Full Marks-100 Time : 3 Hrs. SECTION A- 10 MARKS Question 1: A) Choose the correct optionfrom the following (i) (10 marks) An adiabatic process occurs at constant a) Temperature b) Pressure c) Heat d) Temperature and Pressure (1) What condition must be satisfied for constructive interference to occur? a) The waves must have opposite amplitudes b) The waves must be out of phase c) The waves must have the same frequency and be in phase d) The waves must have different wavelengths (ii) Ifa source of sound is moving away from an observer, what happens to the perceived frequency of the sound? a) It incrcases b) It decrease c) It remains constant d) It depends on the medium Turn over 2 (iv) Ifthe distancei between two masses is doubled, how doesthe gravitational them change? It doubles a (v) In rotational a. b. It quadruples C. It halves d. None of these motion, what does torque represent? Linear force b. Rotational force c. Angular velocity d. Lincar displacement (vi) For monoatomic gases, degree of freedom is a) 4 b) 3 c) 4 d) 5 (vii) After terminal velocity is reached, the acceleration of a body falling through a viscous fluid is: a) equal to g b) zero c) less than g d) more than g (vii) If two vectors are perpendicular to each other, their dot product is: a) Zero b) Maximum c) Minimum d) Negative (ix) The absorptive power of a perfectly black body is: a) 0 b) 0.5 c) 1 d) Infinity (x) How is viscosity affected by an increase in temperature for most fluids? a) Increases b) Decrcases c) Remains constantd) Depends on the specific fluid X/Physics 3 Section B - 30 MARKS (2x10-20) Question 2: a) Write two consequence of escape velocity. b) A drop of oil poured on water surface spreads out, but a water drop poured on oil is compressed in a globule. Explain. c) Find the differentiation of y= x +7 x'- 4x' + 10x - 2, when x = 1. d) Equal masses of helium and oxygen gases are given equal quantities of heat. Which gas will undergo a greater temperature rise and why? e) What is the significance of critical velocity? f) State one condition when Doppler's effect is not applicable. g) Calculate the work done for the following case. P(I0 new ton/m ) 12A B C 12 3 4 5 6 V(litre) Turn over 4 h) You may have seen in na circus a motorcyclist driving in vertical loops inside a hollow spherical chamber with holes, so the deat can spectators watch from oute Explain clearly why the (a point, with i) Is j) no motorcyclist does not drop down when he is at the support from below. superheating of steam an isobaric process or Write the dimension Question 3: a) b) of Strain and Stress. isothermal process, and why? |10 marks] A tyre pumped to a temperature of Explain with a uppem pressure of2 atm at 27 degree Celsius suddenly bursts. What is the the escaping air? Given: Y = 1.4 for air, (2)7= 1.219. (3) graph the variation of the stress and strain in the wire subjected to a continuously increasing wire. c) d) 3) Find the expression for moment of inertia of a uniform disc about its diameter. (3) Write the significance of Reynold's Number. (1) SECTION C- 60 marks (Answer any 6 out of 7 question) Question 4: a) Explain the formation of standing waves with relevant diagram in a closed organ ppe and show how their frequencies are in a ratio of 1:3:5: .2. XI/Physics 5 b) coefficient of of friction between two surfaces in contact having the angle is What (2) friction accelerating in interstellar spaceship his of out thrown A An astronaut accidently gets What is the acceleration Space at a constant rate of 200 m/s'. of the astronaut just after he is outside the spaceship? revolving in an orbit close to the satellite a of energy kinetic the d) If doubled, will the satellite escape? (2) carth happens to be (2) Question 5: dimension under the action of constant one in moving particle a of x a) The displacement and t is in equation =x -3 where x is in meters the by time the to related force is seconds. 3s (ii) t= 6s. Find the velocity of the particle at (i) t = (2+2-4) bubble of surface tension 0.06 N/m from 2cm soap a blowing in done work the Find b) radius to 5cm radius. (2) projcctile when its angle of c) What will be the effect on the maximum height of a projection? (2) projection is changed from 30" o60", keeping the same initial velocity of first d) The fundamental frequency of an open organ pipe is 300Hz. The frequency of the overtone of another closed organ pipe is the sanme as the frequency of the first overtone of open pipe. What are the lengths of the pipes? The speed of sound is 300m/s. (2) Turn over 6 Question 6: a) Derive the intensity of electric field at a point in broadside position of an electric dipole with appropriate diagram. b) (4) Asimple harmonic oscillator is represented by the equation: Y = 0.20 sin(450t+0.26). values of i) Amplitude i1) Angular frequency Y is in metres, t is in seconds. Find the oscillation 11) Frequency of oscillation iv) Time period of (4) to First Law of Thermodynamics reference in following the for expression c) Write the Energy of the system for an isochoric Work done in acyclic process ii) Internal i) (2) process Question 7: obtain the relation: (a) Use principle of superposition of waves to [4) I(a,ta) [2) (b) State Hooke's law. particle, (c) The energy E of a particle oscillating in SHM depends on the mass m of the frequencynand amplitude a of oscillation. Show dimensionally that E a mn'a? (4) Question 8: a) Explain Carnot simaginary heat engine and obtain the expression for efficiency :(2+3 5) J-T2 XVPhysics 7 With what birds on a tree 39.6 mhigh and at a distance of 59,2 m. a observes b) Aperson angle of 45 so that it may hit the an at arrow an throw should velocity the person ole (3) bird? their ratio of their terminal be will What B. ball of that c) The diameter of ball A is triple (2) velocities in water? Question 9 gas. Which of the below processeS a) The below are P-V diagrams for cyclic processes fora (4) heat is absorbed by the gas? Give reason for your answer. P (a) P V (b) V (d) V P (c) P b) Derive an expression for the petentiatenergy of an electric dipole of dipole HOveTUnt p in the clectric field E (3) Turn over 8 c) The density of a gas at normal pressure and 0 degree Celsius temperature is 1.2 kgm' Calculate 0 degree mean square velocity of the molecules of the gas at Celsius. i) the root 1) the temperature at which the velocity will become three times the initial velocity. Normal pressure =1* 10 N/m ? (3) Question 10 a) Drawa P-V graplh for isothermal and adiabatic expansion and compare its slopes. (3+2) b) What is the phase difference between particles of mcdium on the 2 sides of a node? (1) c) Write two applications of resonance. (2))! d) Two cqual and like charges are placed at a distance d-6 cn. They cxert a force 12x10* N on cach other. What is the magnitude of cach charge? (2)

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