11th physics

 

KM

QUARTERLY EXAM — 2025

11th Standard — Physics (Tamil Nadu State Board)

Time: 3 Hours
Maximum Marks: 100
Date: ____________

Instructions:

• Answer all questions. Write neat diagrams where necessary.
• Start each unit section on a new page if printing is required (you may use page breaks).
• Use g = 10 m/s² unless otherwise specified.

Unit 1 — Nature of Physical World and Measurement

Very Short Answer (2 Marks each)

1. Q.No.4a. Write short notes on Unit. (2)
2. Q.No.4c. Write short notes on Dimensionless quantities. (2)
3. Q.No.2. The radius of the circle is 3.12 m. Calculate the area of the circle with regard to significant figures. (2)

Short Answer (3 Marks each)

4. Q.No.1. Briefly explain the types of physical quantities. (3)
5. Q.No.3. Write the rules for determining significant figures. (3)
6. Q.No.4. What are the limitations of dimensional analysis? (3)
7. Q.No.5. Define precision and accuracy. Explain with one example. (3)
8. Q.No.5. Explain the principle of homogeneity of dimensions. Give example. (3)

Long Answer (5 Marks each)

9. Q.No.1 i). Explain the use of screw gauge and vernier caliper in measuring smaller distances. (5)
10. Q.No.1 ii). Write a note on triangulation method and radar method to measure larger distances. (5)
11. Q.No.2. Explain in detail the various types of errors. (5)
12. Q.No.3. What do you mean by propagation of errors? Explain the propagation of errors in addition and multiplication. (5)
13. Q.No.3. Assuming that the frequency γ of a vibrating string may depend upon (i) applied force (F) (ii) length (l) (iii) mass per unit length (m), prove that γ ∝ (1/l)√(F/m) using dimensional analysis. (5)

Unit 2 — Kinematics

Very Short Answer (2 Marks each)

1. Q.No.1. Explain what is meant by Cartesian coordinate system? (2)
2. Q.No.2. Define a vector. Give examples. (2)
3. Q.No.3. Define a scalar. Give examples. (2)
4. Q.No.6. How do you deduce that two vectors are perpendicular? (2)
5. Q.No.7. Define displacement and distance. (2)
6. Q.No.8. Define velocity and speed. (2)
7. Q.No.9. Define acceleration. (2)
8. Q.No.11. Define a radian. (2)
9. Q.No.14. Write down the kinematic equations for angular motion. (2)

Short Answer (3 Marks each)

10. Q.No.4. Write a short note on the scalar product between two vectors. (3)
11. Q.No.5. Write a short note on the vector product between two vectors. (3)
12. Q.No.10. What is the difference between velocity and average velocity? (3)
13. Q.No.12. Define angular displacement and angular velocity. (3)
14. Q.No.6. An object at an angle such that the horizontal range is 4 times of the maximum height. What is the angle of projection of the object? (3)
15. Q.No.13. Compare the components for the following vector equations:
    1. a) Tj - mgj = maj
    2. b) T + F = A + B
    3. c) T - F = A - B
    4. d) Tj = mgj + maj
    (3)

Long Answer (5 Marks each)

16. Q.No.1. Explain in detail the triangle law of addition. (5)
17. Q.No.2. Discuss the properties of scalar and vector products. (5)
18. Q.No.3. Derive the kinematic equations of motion for constant acceleration. (5)
19. Q.No.4. Derive the equations of motion for a particle: (a) falling vertically (b) projected vertically. (5)
20. Q.No.5. Derive the equation of motion, range and maximum height reached by the particle thrown at an oblique angle θ. (5)
21. Q.No.6. Derive the expression for centripetal acceleration. (5)

Unit 3 — Laws of Motion

Very Short Answer (2 Marks each)

1. Q.No.2. State Newton’s second law. (2)
2. Q.No.3. Define one newton. (2)
3. Q.No.7. What is the meaning by ‘pseudo force’? (2)
4. Q.No.9. State Newton’s third law. (2)
5. Q.No.10. What are inertial frames? (2)

Short Answer (3 Marks each)

6. Q.No.1. Explain the concept of inertia. Write two examples each for inertia of motion, inertia of rest and inertia of direction. (3)
7. Q.No.4. Show that impulse is the change of momentum. (3)
8. Q.No.6. Explain various types of friction. Suggest a few methods to reduce friction. (3)
9. Q.No.8. State the empirical laws of static and kinetic friction. (3)
10. Q.No.11. Under what condition will a car skid on a leveled circular road? (3)
11. Q.No.2. What are concurrent forces? State Lami’s theorem. (3)
12. Q.No.7. Briefly explain ‘centrifugal force’ with suitable examples. (3)
13. Q.No.9. Describe the method of measuring angle of repose. (3)
14. Q.No.10. Explain the need for banking of tracks. (3)
15. Q.No.1. A force of 50 N acts on the object of mass 20 kg shown in the figure. Calculate the acceleration of the object in x and y directions. (3)

Long Answer (5 Marks each)

16. Q.No.1. Prove the law of conservation of linear momentum. Use it to find the recoil velocity of a gun when a bullet is fired from it. (5)
17. Q.No.3. Explain the motion of blocks connected by a string in (i) Vertical motion (ii) Horizontal motion. (5)
18. Q.No.4. Briefly explain the origin of friction. Show that in an inclined plane, angle of friction is equal to angle of repose. (5)
19. Q.No.5. State Newton’s three laws and discuss their significance. (5)
20. Q.No.6. Explain the similarities and differences of centripetal and centrifugal forces. (5)
21. Q.No.5. A bob attached to the string oscillates back and forth. Resolve the forces acting on the bob into components. What is the acceleration experienced by the bob at an angle θ. (5)
22. Q.No.11. Imagine that the gravitational force between Earth and Moon is provided by an invisible string that exists between the Moon and Earth. What is the tension that exists in this invisible string due to Earth’s centripetal force?
    Mass of the Moon = 7.34 × 10²² kg, Distance between Moon and Earth = 3.84 × 10⁸ m (5)

Unit 4 — Work, Energy and Power

Very Short Answer (2 Marks each)

1. Q.No.5a. Define Coefficient of restitution. (2)
2. Q.No.5b. Define Power. (2)
3. Q.No.5c. Define Law of conservation of energy. (2)
4. Q.No.1. Calculate the work done by a force of 30 N in lifting a load of 2 kg to a height of 10 m (g = 10 m s^-2). (2)

Short Answer (3 Marks each)

5. Q.No.1. Explain how the definition of work in physics is different from general perception. (3)
6. Q.No.2. Write the various types of potential energy. Explain the formulae. (3)
7. Q.No.3. Write the differences between conservative and non-conservative forces. Give two examples each. (3)
8. Q.No.4. Explain the characteristics of elastic and inelastic collision. (3)
9. Q.No.5d. Define loss of kinetic energy in inelastic collision. (3)

Long Answer (5 Marks each)

10. Q.No.1. Explain with graphs the difference between work done by a constant force and by a variable force. (5)
11. Q.No.2. State and explain work energy principle. Mention any three examples. (5)
12. Q.No.3. Arrive at an expression for power and velocity. Give some examples for the same. (5)
13. Q.No.4. Arrive at an expression for elastic collision in one dimension and discuss various cases. (5)
14. Q.No.5. What is inelastic collision? In which way it is different from elastic collision. Mention few examples in day to day life for inelastic collision. (5)
15. Q.No.3. A bob of mass m is attached to one end of the rod of negligible mass and length r, the other end of which is pivoted freely at a fixed centre O as shown in the figure. What initial speed must be given to the object to reach the top of the circle? (Hint: Use law of conservation of energy). Is this speed less or greater than speed obtained in the section 4.2.9? (5)
16. Q.No.5. A bullet of mass 20 g strikes a pendulum of mass 5 kg. The centre of mass of pendulum rises a vertical distance of 10 cm. If the bullet gets embedded into the pendulum, calculate its initial speed. (5)

Unit 5 — Motion of System of Particles and Rigid Bodies

Very Short Answer (2 Marks each)

1. Q.No.1. Define centre of mass. (2)
2. Q.No.3. Define torque and mention its unit. (2)
3. Q.No.5. Give any two examples of torque in day-to-day life. (2)
4. Q.No.6. What is the relation between torque and angular momentum? (2)
5. Q.No.7. What is equilibrium? (2)
6. Q.No.9. Define couple. (2)
7. Q.No.10. State principle of moments. (2)
8. Q.No.11. Define centre of gravity. (2)
9. Q.No.12. Mention any two physical significance of moment of inertia. (2)
10. Q.No.13. What is radius of gyration? (2)
11. Q.No.14. State conservation of angular momentum. (2)
12. Q.No.15. What are the rotational equivalents for the physical quantities, (i) mass and (ii) force? (2)
13. Q.No.16. What is the condition for pure rolling? (2)

Short Answer (3 Marks each)

14. Q.No.2. Find out the centre of mass for the given geometrical structures:
    1. Equilateral triangle
    2. Cylinder
    3. Square
    (3)
15. Q.No.4. What are the conditions in which force cannot produce torque? (3)
16. Q.No.8. How do you distinguish between stable and unstable equilibrium? (3)
17. Q.No.17. What is the difference between sliding and slipping? (3)
18. Q.No.1. A uniform disc of mass 100 g has a diameter of 10 cm. Calculate the total energy of the disc when rolling along a horizontal table with a velocity of 20 cm s^-1. (take the surface of table as reference). (3)
19. Q.No.3. A flywheel rotates with a uniform angular acceleration. If its angular velocity increases from 20π rad/s to 40π rad/s in 10 seconds. Find the number of rotations in that period. (3)

Long Answer (5 Marks each)

20. Q.No.1. Explain the types of equilibrium with suitable examples. (5)
21. Q.No.2. Explain the method to find the centre of gravity of a irregularly shaped lamina. (5)
22. Q.No.3. Explain why a cyclist bends while negotiating a curve road? Arrive at the expression for angle of bending for a given velocity. (5)
23. Q.No.4. Derive the expression for moment of inertia of a rod about its centre and perpendicular to the rod. (5)
24. Q.No.5. Derive the expression for moment of inertia of a uniform ring about an axis passing through the centre and perpendicular to the plane. (5)
25. Q.No.6. Derive the expression for moment of inertia of a uniform disc about an axis passing through the centre and perpendicular to the plane. (5)
26. Q.No.7. Discuss conservation of angular momentum with example. (5)
27. Q.No.8. State and prove parallel axis theorem. (5)
28. Q.No.9. State and prove perpendicular axis theorem. (5)
29. Q.No.10. Discuss rolling on inclined plane and arrive at the expression for the acceleration. (5)

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