Q1. Fill in the blanks.

i.        The metallic ball is called the __________of the pendulum.

ii.        The symbols of all units are written in ______________.

iii.        The time taken by the pendulum to complete one oscillation is called its ______________.

iv.        One microsecond is one ______________of a second.

v.        A nanosecond is one ______________of a second.

vi.        The distance-time graph for the motion of an object moving with a constant speed is a ___________________.

Q2. True/False

i.        The basic unit of time is second. _______

ii.        Every object moves with a constant speed. ________

iii.        Distances between two cities are measured in kilometres. ________

iv.        The time period of a given pendulum is not constant. ________

v.        The speed of a train is expressed in m/h. _________

vi.        Clocks that measure such small time intervals are used for scientific research. _______

Q3. What is the basic unit of time?

Q4. What is the basic unit of speed?

Q5. What is speedometer?

Q6. What is distance-time graph?

Q7. What is speed?

Q8. What is oscillatory motion?

Q9. What is motion?

Q10. What is circular motion?

Q11. Give an example of oscillatory motion.

Q12. What is non-uniform motion?

Q13. What is uniform motion?

Q14. What is the smallest time interval that can be measured with commonly available clocks and watches?

Q15. What is a simple pendulum?

Q16. How time was measured when pendulum clocks were not available?

Q17. What are quartz clocks?

Q18. What is average speed?