PSEB CLASS 11 – SEPTEMBER EXAM 2025 Set 1
Subject: Physics
Time: 3 Hours | Maximum Marks: 70
General Instructions
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Question 1 has 20 parts carrying 1 mark each.
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Questions 2 to 8 carry two marks each, with internal choice in Q2, Q4 and Q6.
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Questions 9 to 15 carry three marks each, with internal choice in Q9, Q12 and Q15.
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Question 16 is Comprehension-based, carrying 5 marks (1 mark each).
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Questions 17 and 18 carry 5 marks each, with internal choice.
Q1. Multiple Choice Questions (1 Mark Each)
i. The SI unit of frequency is:
(a) Joule (b) Watt (c) Hertz (d) Newton
ii. Which of the following has the dimension [ML⁰T⁻²]?
(a) Force (b) Pressure (c) Acceleration (d) Work
iii. One light year is a unit of:
(a) Time (b) Distance (c) Velocity (d) Intensity
iv. The number 6.022 × 10²³ has how many significant figures?
(a) 3 (b) 4 (c) 5 (d) 6
v. Which graph represents uniform acceleration correctly?
(a) Straight line, position vs. time
(b) Straight line, velocity vs. time
(c) Parabola, velocity vs. time
(d) Curve, displacement vs. time
vi. Which of the following motions is periodic but not simple harmonic?
(a) Motion of pendulum (b) Revolution of Earth around Sun
(c) Vibration of tuning fork (d) Motion of mass on a spring
vii. If velocity-time graph is a horizontal line, acceleration is:
(a) Zero (b) Constant (c) Increasing (d) Negative
viii. The equation of motion s = ut + ½at² is derived using:
(a) Newton’s first law (b) Calculus method
(c) Graphical method (d) Work-energy theorem
ix. Which is true about distance?
(a) It can never be zero
(b) It is always greater than displacement
(c) It is scalar
(d) All of these
x. The rate of change of displacement is:
(a) Speed (b) Acceleration (c) Velocity (d) Momentum
xi. The angle between velocity and centripetal acceleration in uniform circular motion is:
(a) 0° (b) 90° (c) 180° (d) 270°
xii. The vector product of two parallel vectors is:
(a) Zero (b) Maximum (c) Negative (d) Infinite
xiii. Which of the following is a non-contact force?
(a) Friction (b) Magnetic force (c) Tension (d) Normal reaction
xiv. The law of inertia is also known as:
(a) Newton’s first law (b) Newton’s second law
(c) Newton’s third law (d) Law of momentum
xv. The work done on a body moving in a circular path by centripetal force is:
(a) Positive (b) Negative (c) Zero (d) Variable
xvi. Kinetic energy depends upon:
(a) Mass only (b) Velocity only (c) Both mass and velocity (d) Acceleration
xvii. SI unit of impulse is same as that of:
(a) Force (b) Momentum (c) Work (d) Energy
xviii. The energy possessed by a body due to its position is called:
(a) Heat energy (b) Potential energy (c) Kinetic energy (d) Work
xix. The moment of inertia depends on:
(a) Mass (b) Distribution of mass (c) Axis of rotation (d) All of these
xx. The unit of torque is:
(a) Joule (b) Nm (c) N/m (d) Watt
Two Marks Questions
Q2. (a) State the difference between base and derived physical quantities. Give two examples each.
OR
(b) Convert 1 Newton (N) into dynes.
Q3. Define accuracy and precision in measurements. Give examples.
Q4. Distinguish between uniform motion and uniformly accelerated motion.
OR
State differences between scalar and vector quantities.
Q5. Derive the relation between linear velocity and angular velocity for circular motion.
Q6. (a) Define coefficient of friction. Write its SI unit.
OR
(b) A stone of mass 2 kg is tied to a string and whirled in a horizontal circle of radius 1 m with speed 5 m/s. Find the tension in the string.
Q7. Under what condition will the work done by a force be zero? Give an example.
Q8. State any three characteristics of a conservative force.
Three Marks Questions
Q9. (a) Derive the equation of motion v² – u² = 2as using graphical method.
OR
(b) The velocity of a body changes from 10 m/s to 20 m/s in 5 seconds. Find the acceleration and distance covered.
Q10. Define equilibrium of forces. State Lami’s theorem.
Q11. Define and explain angular momentum. Derive its relation with torque.
Q12. (a) Derive an expression for kinetic energy of a body in motion.
OR
(b) A stone of mass 0.5 kg is thrown vertically upward with speed 20 m/s. Find the maximum height and total time of flight. (g = 9.8 m/s²)
Q13. What is work done by variable force? State the work-energy theorem.
Q14. Explain why a cricket fielder lowers his hands while catching a fast-moving ball.
Q15. (a) Derive the expression for acceleration due to gravity at a depth h below Earth’s surface.
OR
(b) Explain why a person feels weightlessness inside a freely falling lift.
Q16. Comprehension (5 × 1 = 5 Marks)
Passage:
When a body is thrown at an angle with the horizontal, it follows a curved path called a projectile. The horizontal motion is uniform while the vertical motion is uniformly accelerated due to gravity. The path is a parabola. The maximum height depends on the vertical component of velocity, and the horizontal range depends on both velocity and angle of projection.
Questions:
(a) What is the shape of the trajectory of a projectile?
(b) Which component of velocity remains constant in projectile motion?
(c) What happens to vertical velocity during upward motion?
(d) On what factors does horizontal range depend?
(e) What is the horizontal range when the angle of projection is 45°?
Five Marks Questions
Q17. (a) Derive expressions for maximum height, time of flight, and range of a projectile.
OR
(b) Derive the parallelogram law of vector addition.
Q18. (a) State and explain the law of conservation of angular momentum with one example.
OR
(b) Derive the relation between torque, moment of inertia, and angular acceleration.
