11th Physics Short & Long Answer Questions EM Based on reduced Syllabus 2020-21

BASED ON REDUCED SYLLABUS 2020-21

UNIT 1 NATURE OF PHYSICAL WORLD AND MEASUREMENT

II. Short Answer Questions

2. How will you measure the diameter of the Moon using parallax method?

3. Write the rules for determining significant figures.

III. Long Answer Questions

1. i) Explain the use of screw gauge and vernier caliper in measuring small­er distances.

    ii) Write a note on triangulation method and radar method to measure larger distances.

2. Explain in detail the various types of errors.

3. What do you mean by propagation of errors? Explain the propagation of errors in addition

    and multiplication.

4. What are the limitations of dimensional analysis?

5. Define precision and accuracy. Explain with one example.

4. Write short notes on the following.

b) Rounding - off

c) Dimensionless quantities

UNIT 2 KINEMATICS

II. Short Answer Questions

1. Explain what is meant by Cartesian coordinate system?

4. Write a short note on the scalar product between two vectors.

5. Write a short note on vector product between two vectors.

6. How do you deduce that two vectors are perpendicular?

8. Define velocity and speed.

9. Define acceleration.

10. What is the difference between velocity and average velocity.

 

III. Long Answer Questions

1. Explain in detail the triangle law of addition.

2. Discuss the properties of scalar and vector products.

3. Derive the kinematic equations of motion for constant acceleration.

4. Derive the equations of motion for a particle (a) falling vertically (b) projected vertically

 

UNIT 3 LAWS OF MOTION

II. Short Answer Questions

1. Explain the concept of inertia. Write two examples each for inertia of motion, inertia of rest and inertia of direction.

2. State Newton’s second law.

3. Define one newton.

5. Using free body diagram, show that it is easy to pull an object than to push it.

6. Explain various types of friction. Suggest a few methods to reduce friction.

8. State the empirical laws of static and kinetic friction.

9. State Newton’s third law.

10. What are inertial frames?

11. Under what condition will a car skid on a leveled circular road?

III. Long Answer Questions

3. Explain the motion of blocks connected by a string in i) Vertical motion ii) Horizontal

     motion.

4. Briefly explain the origin of friction. Show that in an inclined plane, angle of friction is equal  

    to angle of repose.

5. State Newton’s three laws and discuss their significance.

8. Briefly explain ‘rolling friction’.

9. Describe the method of measuring angle of repose.

10. Explain the need for banking of tracks.

11. Calculate the centripetal acceleration of Moon towards the Earth.

 

UNIT 4 WORK, ENERGY AND POWER

II. Short Answer Questions

4. Explain the characteristics of elastic.

5. Define the following

b) Power

         d) loss of kinetic energy in inelastic collision.

III. Long Answer Questions

2. State and explain work energy principle. Mention any three examples for it.

4. Arrive at an expression for elastic collision in one dimension and discuss various cases.

 

UNIT 5 MOTION OF SYSTEM OF PARTICLES AND RIGID BODIES

II. Short Answer Questions

1. Define centre of mass.

2. Find out the centre of mass for the given geometrical structures.

a) Equilateral triangle

b) Cylinder c) Square

3. Define torque and mention its unit.

4. What are the conditions in which force can not produce torque?

5. Give any two examples of torque in day-to-day life.

6. What is the relation between torque and angular momentum?

9. Define couple.

10. State principle of moments.

11. Define centre of gravity.

15. What are the rotational equivalents for the physical quantities, (i) mass and (ii) force?

III. Long Answer Questions

2. Explain the method to find the centre of gravity of a irregularly shaped lamina.

3. Explain why a cyclist bends while negotiating a curve road? Arrive at the expression for angle of bending for a given velocity.

4. Derive the expression for moment of inertia of a rod about its centre and perpendicular to the rod.

10. Discuss rolling on inclined plane and arrive at the expression for the acceleration.

UNIT 6 GRAVITATION

II. Short Answer Questions

5. What is meant by superposition of gravitational field?

6. Define gravitational potential energy.

7. Is potential energy the property of a single object? Justify.

8. Define gravitational potential.

9. What is the difference between gravitational potential and gravitational potential energy?

10. What is meant by escape speed in the case of the Earth?

11. Why is the energy of a satellite (or any other planet) negative?

12. What are geostationary and polar satellites?

13. Define weight

III. Long Answer Questions

4. Derive the expression for gravitational potential energy.

5. Prove that at points near the surface of the Earth, the gravitational potential energy of the object is U mgh =

6. Explain in detail the idea of weightlessness using lift as an example.

7. Derive an expression for escape speed.

8. Explain the variation of g with lattitude.

9. Explain the variation of g with altitude.

10. Explain the variation of g with depth from the Earth’s surface.

11. Derive the time period of satellite orbiting the Earth.

12. Derive an expression for energy of satellite.

13. Explain in detail the geostationary and polar satellites.

 

UNIT 7 PROPERTIES OF MATTER

II. Short Answer Questions

1. Define stress and strain.

2. State Hooke’s law of elasticity.

3. Define Poisson’s ratio.

4. Explain elasticity using intermolecular forces.

5. Which one of these is more elastic, steel or rubber? Why?

6. A spring balance shows wrong readings after using for a long time. Why?

7. What is the effect of temperature on elasticity?

8. Write down the expression for the elastic potential energy of a stretched wire.

13. Define coefficient of viscosity of a liquid.

14. Distinguish between streamlined flow and turbulent flow.

15. What is Reynold’s number? Give its significance.

16. Define terminal velocity.

17. Write down the expression for the Stoke’s force and explain the symbols involved in it.

18. State Bernoulli’s theorem.

20. Two streamlines cannot cross each other. Why?

21. Define surface tension of a liquid. Mention its S.I unit and dimension.

22. How is surface tension related to surface energy?

23. Define angle of contact for a given pair of solid and liquid.

25. What are the factors affecting the surface tension of a liquid?

26. What happens to the pressure inside a soap bubble when air is blown into it?

27. What do you mean by capillarity or capillary action?

28. A drop of oil placed on the surface of water spreads out. But a drop of water place on oil contracts to a spherical shape. Why?

29. State the principle and usage of Venturimeter.

 

III. Long Answer Questions

1. State Hooke’s law and verify it with the help of an experiment.

3. Derive an expression for the elastic energy stored per unit volume of a wire.

7. Derive the expression for the terminal velocity of a sphere moving in a high viscous fluid   

     using stokes force.

8. Derive Poiseuille’s formula for the volume of a liquid flowing per second through a pipe under  

     streamlined flow.

9. Obtain an expression for the excess of pressure inside a i) liquid drop ii) liquid bubble iii) air  

      bubble.

10. What is capillarity? Obtain an expression for the surface tension of a liquid by capillary rise  

       method.

11. Obtain an equation of continuity for a flow of fluid on the basis of conservation of mass.

12. State and prove Bernoulli’s theorem for a flow of incompressible, non-viscous, and streamlined flow of fluid.

13. Describe the construction and working of venturimeter and obtain an equation for the  

        volume of liquid flowing per second through a wider entry of the tube.

 

UNIT 8 HEAT AND THERMODYNAMICS

II. Short answer questions:

9. State Stefan-Boltzmann law.

10. What is Wien’s law?

12. What is a black body?

13. What is a thermodynamic system? Give examples.

14. What are the different types of thermodynamic systems?

16. What is mean by state variable? Give example.

17. What are intensive and extensive variables? Give examples.

18. What is an equation of state? Give an example.

19. State Zeroth law of thermodynamics.

20. Define the internal energy of the system.

21. Are internal energy and heat energy the same? Explain.

22. Define one calorie.

23. Did joule converted mechanical energy to heat energy? Explain.

24. State the first law of thermodynamics.

25. Can we measure the temperature of the object by touching it?

26. Give the sign convention for Q and W.

27. Define the quasi-static process.

28. Give the expression for work done by the gas.

29. What is PV diagram?

31. Give the equation of state for an isothermal process.

32. Give an expression for work done in an isothermal process.

33. Express the change in internal energy in terms of molar specific heat capacity.

34. Apply first law for (a) an isothermal (b) adiabatic (c) isobaric processes.

35. Give the equation of state for an adiabatic process.

36. Give an equation state for an isochoric process.

37. If the piston of a container is pushed fast inward. Will the ideal gas equation be valid in the intermediate stage? If not, why?

38. Draw the PV diagram for

a. Isothermal process

b. Adiabatic process

c. isobaric process

d. Isochoric process

39. What is a cyclic process?

41. State Clausius form of the second law of thermodynamics

42. State Kelvin-Planck statement of second law of thermodynamics.

43. Define heat engine.

44. What are processes involves in a Carnot engine?

45. Can the given heat energy be completely converted to work in a cyclic process? If not, when can the heat can completely converted to work?

46. State the second law of thermodynamics in terms of entropy.

47. Why does heat flow from a hot object to a cold object?

III. Long answer Questions:

4. Describe the anomalous expansion of water. How is it helpful in our lives?

5. Explain Calorimetry and derive an expression for final temperature when two thermodynamic systems are mixed.

7. Explain in detail Newton’s law of cooling.

8. Explain Wien’s law and why our eyes are sensitive only to visible rays?

10. Explain Joule’s Experiment of the mechanical equivalent of heat.

11. Derive the expression for the work done in a volume change in a thermodynamic system.

12. Derive Mayer’s relation for an ideal gas.

13. Explain in detail the isothermal process.

14. Derive the work done in an isothermal process

15. Explain in detail an adiabatic process.

16. Derive the work done in an adiabatic process

17. Explain the isobaric process and derive the work done in this process

18. Explain in detail the isochoric process.

20. Explain the heat engine and obtain its efficiency.

21. Explain in detail Carnot heat engine.

22. Derive the expression for Carnot engine efficiency.

23. Explain the second law of thermodynamics in terms of entropy.

 

UNIT 9 KINETIC THEORY OF GASES

II. Short answer questions

1. What is the microscopic origin of pressure?

2. What is the microscopic origin of temperature?

3. Why moon has no atmosphere?

5. What is the relation between the average kinetic energy and pressure?

6. Define the term degrees of freedom.

7. State the law of equipartition of energy.

8. Define mean free path and write down its expression.

12. List the factors affecting the mean free path.

III. Long Answer Questions

2. Derive the expression of pressure exerted by the gas on the walls of the container.

3. Explain in detail the kinetic interpretation of temperature.

4. Describe the total degrees of freedom for monoatomic molecule, diatomic molecule and  

     triatomic molecule.

5. Derive the ratio of two specific heat capacities of monoatomic, diatomic and triatomic

    molecules

7. Derive the expression for mean free path of the gas.

 

UNIT 10 OSCILLATIONS

II. Short Answers Questions

1. What is meant by periodic and non-periodic motion?. Give any two examples, for each motion.

2. What is meant by force constant of a spring?.

3. Define time period of simple harmonic motion.

4. Define frequency of simple harmonic motion.

5. What is an epoch?.

6. Write short notes on two springs connected in series.

7. Write short notes on two springs connected in parallel.

8. Write down the time period of simple pendulum.

9. State the laws of simple pendulum?.

10. Write down the equation of time period for linear harmonic oscillator.

III. Long Answer Questions

1. What is meant by simple harmonic oscillation?. Give examples and explain why every

     simple harmonic motion is a periodic motion whereas the converse need not be true.

2. Describe Simple Harmonic Motion as a projection of uniform circular motion.

4. Write down the difference between simple harmonic motion and angular simple harmonic motion.

5. Discuss the simple pendulum in detail.

7. Describe the vertical oscillations of a spring.

8. Write short notes on the oscillations of liquid column in U-tube.

9. Discuss in detail the energy in simple harmonic motion.

 

UNIT 11 WAVES

II. Short Answers Questions

1. What is meant by waves?.

2. Write down the types of waves.

3. What are transverse waves?. Give one example.

4. What are longitudinal waves?. Give one example.

5. Define wavelength.

6. Write down the relation between frequency, wavelength and velocity of a wave.

7. What is meant by interference of waves?.

8. Explain the beat phenomenon.

9. Define intensity of sound and loudness of sound.

13. Sketch the function y = x + a. Explain your sketch.

III. Long Answer Questions

1. Discuss how ripples are formed in still water.

2. Briefly explain the difference between travelling waves and standing waves.

3. Show that the velocity of a travelling wave produced in a string is v T = μ

4. Describe Newton’s formula for velocity of sound waves in air and also discuss the Laplace’s  

    correction.

6. Briefly explain the concept of superposition principle.

7. Explain how the interference of waves is formed.

8. Describe the formation of beats.

9. What are stationary waves?. Explain the formation of stationary waves and also write down  

     the characteristics of stationary waves.

10. Discuss the law of transverse vibrations in stretched strings.

11. Explain the concepts of fundamental frequency, harmonics and overtones in detail.

12. What is a sonometer?. Give its construction and working. Explain how to determine the  

       frequency of tuning fork using sonometer.

13. Write short notes on intensity and loudness.

 

14. Explain how overtones are produced in a

(a) Closed organ pipe

(b) Open organ pipe 

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