CLASS 9 Physics
Q1 Name any two basic quantities and write their SI units.
Q2.Name any two derived quantities and write their SI units.
Q3 What are the three requirements for selecting a unit of a physical quantity.?
Q4. Define “light year".
Q5. Compare the time periods of two pendulum of length 4m and 25 m.
Q6. State two factors affecting the time period of a pendulum. State the effects also.
Q7. Distinguish between speed and velocity.
Q8. A car is moving with a velocity of 20 m/s. The brakes are applied to retard it at a rate of 2m/s². What will be the speed after 5 s of applying the brakes?
Q9. What does the slope of following graphs represent?
i) displacement-time graph ii) velocity-time graph
Q10. Derive the relation: S=ut + ½at² ( any method).
Q11. A body moves from rest with a uniform acceleration and travels 270 m in 3 s. Find the velocity of the body at 10 s after the start.
Q12. Define: i) acceleration ii) acceleration due to gravity.
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