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ISC Class XI Sample / Model Paper 2026 : Physics

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Half Yearly Examination 2025-26 Class- XI Subject- Physics Fuil Marks: 70 Time- 3hrs SectionA-14 marks 1 (1*7=7] A. hoose the correct option: (a Which of the following is not a unit of length? A1) parsec (ii)micron (i ) barn (iv) AU (b Astone of s00 gis acted upon by two perpendicular forces of 3Nand 4N. The acceleration produced in the body is: (i) 15 m/s (iv) 25 m/s (ii) 10m/s (ii) 20 m/s ( The number of significant figures in 0.0009020*1024 m is: (ii) 3 (ii) 7 (iv) 4 )5 A body of mass M moves from rest under the action of a constant force Ffor 2 s. The maximum power attained by it is: () 2FM (i) 2F/M (iv) 2F /M (iii) F/M (ey Horizontal range of a projectiie is four times of the maximum height attained. The angle of projection with the horizontal is: (i)45 (E) 30 (i ) 60 (iv) 90 Assertion: Uniform circular motion is an acceierated motion. Reason: The rate of change of velocity is same over equal overeeual intervalof time. (0) Assertion and reason both are ceh (ii) Assertion is correct, reason is wrong (iji) Assertion and reason both are wrong (iv) Assertion is wrong, reason is correct (g)A particde of unit mass executes 1D motion with its velocity v = bnt-2n+2, Theforce acting on it is: (i)(-2n+1)b2n-1p-4n-l N 1. (i ) -2n b2ng-4n+1 N (ii)(-2n+2)b2ng-2n*1 N (iv) -2b2nt-an+l N B. Answer briefly and to the point: (a)) Explain the reason of separation of cream from milk. [1*7=7) ( Discuss non-conservative force with exampie. ( If the momentum of the body increases by 12.5%, how willits kinetic energy change? )Add three lengths 12.3 cm, 3.456 m and 0.28 m. find their sum in appropriate significant figures. e) Find the value of 3 rad in degree. (Y Give example of one dimensionless and unitless quantity. Ae) \A particle is moving in a straight line with unitorm velocity. Can its average velocity over any interval of tirme be same with its instantaneous velocity? Justify. Section B-14 marks 2. Find out the dimension of energy per unit volume. Which physical quantity matches the dimension you have obtained? (2) [2] 3 If A= -2i + j- kand i+ 5j - 6k , thefind the angle between them. .) Aparticle is projected with avelocity of 14 m/s at an angle of 60 with the horizontal direction, Write Gown the magnitude and direction of the particle at the highest point of the path. (2] Astone tied to the end string 75 cm long is whirled in a horizontal circle with a constant speed. If the stone makes 21 revolutions in 20 s, calculate the acceleration of the stone. [2) 6./The force acting on a particie is F = ax + bN. Find the work done in displacing the particle from 3 m to 5 m in the same direction of the applied force. 7. How is impulse related [2] to linear momentum of a body? [2] . A horizontal force of 500 N pulls twO masses 15 kg and 20 kg connected by a string lying on d frictionless table. Find the tension of the string. [2] Section C- 27 marks Write down one important limitation of dimension analysis. Check the correctness of the given equation: S,th = u +(2t-1), symbols have their usual meaning. [3] 10.A ball initially at rest falls freeiy on a perfectly elastic plate from a height of 6 m. Draw the velocity time graph for the motion of the bal. [3) L2. When a cyclist negotiates a circular path of radius r with velocity v, making an angle 5 with the horizontal, show that, tan 9 = 2 [3] 12.Finda vector whose magnitude is 15 and which is perpendicular to each of the vectors, A= 2i + 3j 4k and B= 7i- 5j+ k. (3] 3. Aboy can throwa ballto a maximum horizontal distance of 150 m. How much high above the ground tan the boy throw the same ball? 4. A toy train with two components having mass m and m2, is pulied by a force acting at angle with the horizontal. Calculate the acceieration of the system and tension of the string connecting the two masses. [3) 15. An object of mass 950 g is sliding on a surface inciined at an angle of 30 with the horizontal. The length of the inlined plane is 3 m. If u F 1 find out the veiocity of the object witn which it 2/3 reaches the bottom. 16/Prove that in an elastic collision in one dimension, the [3] relative velocity of approach before impact is equal to the relative velocity of separation after impact. [31 17/What is elastic potential energy? Find its expression. (3] Section D-15 marks 18. (a) Find the magnitude and direction of the resulkant of two vectors. heo ve ch () Calculate the unit vector parallel to the resuitant of two veciors A = 3i-j +2k and B= 2i-3j +k. [51 13. Derive an expression for velocity and tension in the string when a body moves in avertica! circie. Find the values of velocity and tension at the highest point of its journey. (5! 20. What do you understand by limiting friction? Draw a graph of frictional force vs applied forces on a a block kept on a rough horizontal table. Discuss angle of repose. (5)

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