Tiêu đề XI Physics QP R.pdf ✅

SESSION ENDING EXAMINATION 2022-23 CLASS-XI SUBJECT – PHYSICS TIME: 3 HR. MAX.MARKS:70 General Instruction (1) There are 35 questions in all. All questions are compulsory. (2) This question paper has five sections: Section A, Section B, Section C, Section D and Section E. All the sections are compulsory. (3) Section A contains eighteen MCQ of 1 mark each, Section B has seven Questions of 2 marks each, Section C contains five questions of 3 marks each, Section D contains three long questions of 5 marks each, and Section E contains two case study based questions of 4 marks each. (4) There is no overall choice. However internal choice has been provided in Sections B, C, D and E. You have to attempt only one of the choices in such questions. (5) Use of calculator is not allowed. Log tables can be used. SECTION A Q.1 The density of a liquid is 13.6 g cm-3. Its value in S.I. is (a) 13.6 kgm-3 (b) 136 kgm-3 (c) 13600 kgm-3 (d) 1360kgm-5 Q.2 The dimensional formula for angular momentum is same as that for: (a) Torque (b) Plank’s constant (c) Gravitational constant (d) impulse Q.3 Figures (i) and (ii) below show the displacement-time graphs of two particles moving along the x-axis. We can say that (a) Both the particles are having a uniformly accelerated motion (b) Both the particles are having a uniformly retarded motion (c) Particle (i) is having a uniformly accelerated motion while particle (ii) is having a uniformly retarded motion (d) Particle (i) is having a uniformly retarded motion while particle (ii) is having a uniformly accelerated motion Q.4Which of the following represents the correct dimension of the coefficient of viscosity? a) M L-1 T -2 c) M L-2 T -2 b) M L -1 T -1 d) M L T -1 Q.5 The displacement – time graph of the two particles A and B are shown in the figure. The ratio of their velocities Va : Vb is

(d) It does not have population For question number 16,17,18 two statements are given, One labelled Assertion (A) and other labelled Reason (R). Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true but R is not the correct explanation of A (c)A is true but R is false. (d) A is false and R is also false. Q. 16 ASSERTION: It is harder to open and shut the door if we apply force near the hinge. REASON: At the hinges the applied force to produce the required torque is maximum. Q. 17 ASSERTION: When distance between two bodies is doubled and also mass of each body is also doubled, gravitational force between them remains the same. R. REASON: According to Newton’s law of gravitation, force is directly proportional to Product of mass of two bodies and inversely proportional to square of distance between their centres. Q.18 ASSERTION: A hollow shaft is found to be stronger than a solid shaft made of same material. REASON: The torque required to produce a given twist in hollow cylinder is greater than that required to twist a solid cylinder of same size and material. SECTION B Q.19 A car of mass 1000kg travelling at 32m/s clashes into rear of a truck of mass 8000kg moving in the same direction with a velocity of 4m/s. After the collision, the car bounces with a velocity of 8m/s. what is the velocity of truck after the impact Q.20 Check the correctness of the equation . (i) T=2 l/g Where T- time period , l - length and g - acceleration due to gravity (ii) v= P/ where v- velocity of sound and P- pressure , - density Q.21 State Work Energy theorem and prove it for constant force. Q.22 State and explain Kepler’s laws of planetary motion. Q.23 A wire of length 150 cm and area of cross section 1 mm2 is stretched by a weight of 3 Kg. Determine the increase in length. Young’s modulus of material of the wire is 2x1011 N/m2 .( g=9.8 m/s2 ) OR Calculate percentage increase in length of wire of diameter 2 mm stretched by a force of 1 Kg weight, Young’s modulus of elasticity of wire is 1.5x1011 N/m2 . Q.24 State Bernoulli’s theorem? How it can be used to lift an aircraft wing. Q.25 Discuss any four factors which affects the speed of sound in gases. SECTION C Q.26 What do you mean by banking of curved road? Determine the angle of banking so as to minimize the wear and tear of the tyre of the car negotiating a banked curve. Q.27 What is perfectly inelastic collision? Show that kinetic energy is invariably lost in such a collision.
Q.28 Find the centre of mass of a uniform L- shaped lamina (a thin flat plate) with a dimensions as shown in fig. The mass of the lamina is 3 kg Q.29 Define escape velocity. Obtain an expression for the escape velocity of the body from the surface of the earth. Q.30 The equation of transverse travelling wave is given by y = 0.05sin 2(0.4 x - 5t) where x and y are in meters and t is in second calculate i) amplitude ii) wavelength iii) angular wave number. OR A string of mass 2.5 Kg is under a tension of 200 N. The length of the stretched string is 20 m. If the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other end? SECTION D Q.31 (a) A projectile is fired with a velocity u making an angle θ with the horizontal. Show that its trajectory follows the parabolic path. Explain it with suitable diagram. (b) Prove that maximum horizontal range is four times the maximum height attained by the projectile when fired at an inclination so as to have maximum horizontal range. OR (a) In projectile motion derive expression for (i) Time of maximum height (ii) Time of flight (iii) maximum height. (b) In projectile motion show that there are two angle of projections for the same horizontal range. (c) state and explain first law of thermodynamics Q.32 (a) On the basis of kinetic theory, derive an expression for the pressure exerted by an ideal gas. (b) Show that the average kinetic energy of a gas molecule is directly proportional to the temperature of the gas. Hence give the kinetic interpretation of temperature. OR (a) State law of equipartition of energy? Using the law of equipartition of energy determine the value of Cp, Cv and  for (i) Monoatomic (ii) Diatomic gases. (b)Calculate the internal energy of 1g of oxygen at N.T.P.(given R=8.31Jmol-1K-1 ) Q.33 (a)Derive expression for total energy of a particle executing Simple Harmonic motion. (b) A block whose mass is 1kg fastened to a spring .The spring constant of a spring is 50N/m. The block is pulled to a distance of x = 10cm from its equilibrium position x= 0 cm on a frictionless surface from rest at t = 0 s. calculate the kinetic and potential energy of the block. OR