PSEB / CBSE Class 11 – Physics (Sample Question Paper)
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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Question 2 to 8 carry two marks each with internal choice in Q2, Q4, and Q6.
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Question 9 to 15 carry three marks each with internal choice in Q9, Q12, and Q15.
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Question 16 carries 5 marks (comprehension type).
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Question 17 and 18 carry 5 marks each with internal choice.
Q1. Multiple Choice Questions (1 mark each)
i. The SI unit of electric current is:
(a) Ohm (b) Ampere (c) Volt (d) Coulomb
ii. The dimensional formula of Planck’s constant (h) is:
(a) [ML²T⁻¹] (b) [ML²T⁻²] (c) [ML²T⁻³] (d) [MLT⁻²]
iii. Which physical quantity has the unit N·m⁻²?
(a) Work (b) Pressure (c) Power (d) Torque
iv. The slope of a velocity-time graph represents:
(a) Speed (b) Displacement (c) Acceleration (d) Momentum
v. The equation of motion s = ut + ½ at² is valid only for:
(a) Variable acceleration (b) Non-uniform velocity
(c) Uniform acceleration (d) Circular motion
vi. If a body returns to its initial position, then displacement is:
(a) Zero (b) Positive (c) Negative (d) Infinite
vii. Which law of motion explains the recoil of a gun?
(a) First law (b) Second law (c) Third law (d) Law of gravitation
viii. A force of 10 N is applied on an area of 2 m². The pressure is:
(a) 2 Pa (b) 5 Pa (c) 10 Pa (d) 20 Pa
ix. Which of the following is a vector quantity?
(a) Work (b) Power (c) Momentum (d) Energy
x. The unit of coefficient of friction is:
(a) N (b) m/s² (c) Dimensionless (d) J
xi. In projectile motion, the horizontal component of velocity is:
(a) Constant (b) Increasing (c) Decreasing (d) Zero
xii. If two vectors are equal in magnitude but opposite in direction, their resultant is:
(a) 2A (b) Zero (c) A (d) √2A
xiii. Which quantity is conserved in elastic collisions?
(a) Only momentum (b) Only kinetic energy
(c) Both momentum & kinetic energy (d) Neither
xiv. Work done in moving a charge in an electric field depends on:
(a) Path (b) Potential difference (c) Speed (d) Time
xv. The acceleration due to gravity is maximum at:
(a) Equator (b) Poles (c) Tropic of Cancer (d) Centre of Earth
xvi. The escape velocity on Earth is nearly:
(a) 11.2 km/s (b) 7.5 km/s (c) 9.8 km/s (d) 3.2 km/s
xvii. Which of the following waves requires a medium?
(a) Light wave (b) Radio wave (c) Sound wave (d) X-rays
xviii. The dimensional formula of frequency is:
(a) [T] (b) [T⁻¹] (c) [M⁰L⁰T⁻²] (d) [L⁻¹]
xix. Which of the following is NOT a unit of energy?
(a) Joule (b) Erg (c) Calorie (d) Watt
xx. The work done in uniform circular motion is:
(a) Positive (b) Negative (c) Zero (d) Constant
Q2–Q8: Two Marks Questions
Q2. (a) Define dimensional analysis. Write one application.
OR
(b) Convert 1 electron volt (eV) into joules.
Q3. Write any two differences between accuracy and precision.
Q4. Differentiate between scalar and vector quantities with two examples each.
OR
Differentiate between mass and weight.
Q5. Derive the relation between linear velocity and angular velocity.
Q6. (a) Define impulse-momentum theorem with one example.
OR
(b) A force of 50 N acts on a body of mass 10 kg. Find its acceleration.
Q7. State the conditions of equilibrium of a rigid body.
Q8. State any three differences between elastic and inelastic collisions.
Q9–Q15: Three Marks Questions
Q9. (a) Explain the principle of a vernier caliper with least count formula.
OR
(b) A projectile is thrown with velocity 20 m/s at 30°. Find its maximum height and range. (Take g = 10 m/s²).
Q10. Define uniform circular motion. Derive an expression for centripetal acceleration.
Q11. State parallelogram law of vector addition and derive the expression for the resultant.
Q12. (a) Define potential energy and kinetic energy. Write expressions.
OR
(b) A stone of mass 2 kg is dropped from a height of 20 m. Find its velocity just before striking the ground.
Q13. Define torque. Write its SI unit and give one daily life example.
Q14. Why does a swimmer push water backward to move forward? Explain with Newton’s law.
Q15. (a) Derive the relation v² – u² = 2as from equations of motion.
OR
(b) Why are safety belts provided in vehicles? Explain with Newton’s law.
Q16. Comprehension (5 × 1 = 5 Marks)
Passage (from Laws of Motion):
Newton’s Laws of Motion form the foundation of mechanics. The first law, also known as the law of inertia, states that a body continues in its state of rest or uniform motion in a straight line unless acted upon by an external force. The second law gives the relation between force and acceleration: F = ma. It also defines force as the rate of change of momentum. The third law states that for every action, there is an equal and opposite reaction. These laws explain many daily life phenomena such as the recoil of a gun, the motion of vehicles, and the movement of rockets. Friction, an external force, often plays a major role in the application of Newton’s laws.
Questions:
(a) State Newton’s first law of motion in words.
(b) Write the mathematical form of Newton’s second law.
(c) Give one daily life example of Newton’s third law.
(d) Define inertia.
(e) Which external force usually opposes motion and affects Newton’s laws in practice?
Five Marks Questions
Q17.
(a) Derive the three equations of motion using the graphical method.
OR
(b) A car starts from rest and accelerates uniformly at 3 m/s² for 8 seconds.
(i) Find its final velocity.
(ii) Find the distance travelled in this time.
(iii) Draw the velocity-time graph and calculate the distance using area under the curve.
Q18.
(a) State and explain Newton’s three laws of motion with one example each. Derive the relation F = ma from the second law.
OR
(b) Derive the expressions for kinetic energy and potential energy of a body. Show that the total mechanical energy of a freely falling body remains conserved.
