CBSE Guess > Papers > Important Questions > Class IX > 2008 > Physics > Physics By Mr. Narendra kolla
Motion
Q. 1. Define the term ‘displacement’. Is it a vector quantity or a scalar quantity?
Q. 2. Define the term ‘distance’. Is it a vector quantity or a scalar quantity?
Q. 3. The displacement of a body can never be greater than the distance covered by a body. Is the statement true or false?
Q. 4. Can a body have zero velocity and still acceleration? Give example.
Q. 5. What is the nature of distance time graph for uniform motion of an object?
Q. 6. What is the acceleration of a freely falling body?
Q. 7. What is the acceleration of a body moving with uniform velocity?
Q. 8. What does the slope of a distance-time graph gives?
Q. 9. What does the area of a velocity-time graph gives?
Q. 10. Give two examples of vector quantities.
Short Answer Questions
Q. 11. A body is moving along a circular path of radius R. What will be the distance and displacement of the body when it completes half a revolution?
Q. 12. An ant travels a distance of 8 cm from P to Q and then moves a distance of 6 cm at right angles to PQ. Find the resultant displacement?
Q. 13. Define Scalar quantities and Vector quantities?
Q. 14. Define the term “uniform acceleration”. Give one example of a uniformly accelerated motion.
Q. 15. Define the term ‘acceleration’. Is it a vector quantity or a scalar quantity?
Q. 16. Distinguish between speed and velocity.
Q. 17. Arrange the following speeds in increasing order (keeping the least speed first):
- An athlete running with a speed of 10 m/s
- A bicycle moving with a speed of 200m/min
- A scooter moving with a speed of 30km/h.
Q. 18. A bullet initially moving with a velocity of 20m/s strikes a target and comes to rest after penetrating a distance of 0.01m in the target. Calculate the retardation produced by the target.
Q. 19. A body moving in a straight line at 72kmph undergoes an acceleration of 4m/s2. Find its speed after 2 seconds.
Q. 20. A car acquires a velocity of 72 kmph in 10 seconds starting from rest. Find (a) the acceleration, and (b) the average velocity.
Long Answer Questions
Q. 21. What is motion? What are types of motion? Define them with one example each.
Q. 22. Derive the relation s = ut + ½ at2
Q. 23. Write the SI units of Displacement, velocity and acceleration?
Q. 24. Define the terms “average speed” and “uniform speed”.
Q. 25. Write the three equations of uniformly accelerated motion. Give the meaning of each symbol which occurs in them.
Q. 26. Write the equations of motion in the case of a freely falling body.
Q. 27. Define the terms (a) Time of flight (b) Maximum height and (c) Range
Q. 28. Write the expressions for (a) time of flight and (b) maximum height
Q. 29. A vertically projected body takes 5 seconds to reach the point of projection. What is the time of ascent and what is the maximum height reached by the body?
Q. 30. A body is thrown vertically upwards with a velocity 19.6 m/s. What is the maximum height reached by the body and what is the time of flight? (take g = 9.8 m/s2)
