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## Physics Revision Help for Half Yearly Exam Class XI CBSE & KVS

3 and 5 Marks Questions

It is very much essential to completely solve all the exercises (including the additional exercises) given in NCERT text book.

1. What are errors? Describe the propagation of errors in addition subtraction multiplication and division.
2. What do you mean by the principle of homogenity of dimensions? Describe the applications of dimensional analysis.
3. Derive the equations of uniformly accelerated motion (graphically)
4. Define projectile motion. Derive expression for Time of Flight, Horizontal Range and maximum height of a projectile.
5. Derive an expression for the trajectory of a projectile.
6. Show that there are two possible angles of projection for obtaining the same range.
7. Derive an expression for centripetal acceleration in Uniform Circular motion.
8. Derive F=ma from Newton’s second law of motion.
1. State and explain Newton’s laws of motion.
2. Show that Newton’s I law and Third law can be derived from II law.
3. A light inextensible string with ends connected to two unequal masses runs over a frictionless pulley and is free to move. Derive an expression for the acceleration of the masses and the tension in the string.
4. State Impulse – momentum principle and explain its applications.
5. Why does a cricket player pulls his hands backwards while taking a catch? Describe similar situations of the principle based on which he does so.
6. Explain the cause of friction.
7. Why friction is called a necessary evil?
8. Describe the different methods used to reduce friction.
9. Derive an expression for the maximum safe velocity of a car on a level road.
10. What do you mean by banking of roads at curves? Derive and expression for the maximum safe velocity of a car on a banked road and hence derive the velocity at curve on a banked road for minimum wear and tear.
11. Derive an expression for the minimum horizontal velocity to be given to a ball hanging vertically from a point so that it is able to just complete a vertical circular path.
12. Derive expression for the tension in a string at the top and bottom position while a body attached to its end describes a vertical circle.
13. State and prove work – Kinetic energy theorem
14. State the principle of conservation of energy. Show that the total mechanical energy of a body falling freely from a height remains constant throughout its motion.
15. Distinguish between elastic and inelastic collisions
16. Show that there is always a loss of kinetic energy in ordinary inelastic collisions.
17. Derive an expression for the velocities after elastic collision between two bodies.
18. Discuss elastic collision in two dimensions
19. Derive the relationship between momentum and kinetic energy.
20. Two particles of different mass have the same momentum; which one has greater kinetic energy – the light body or the heavy body?
21. Two particles of different mass have the same kinetic energy; which one has greater momentum – the light body or the heavy body?