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a) 4 sec
b) 0.25 sec
c) 2.5 sec
d) 40 sec
8. Find the odd one out. 1
a) Atomic clock
b) Quartz Clock
c) Pendulum Clock
d) Sundial
9. Quartz crystal used in quartz clock completes 250000 vibrations in 5 sec. The 1
frequency of the oscillator is
a) 50 Hz
b) 50000 Hz
c) 5000 Hz
d) 500 Hz
10. Astronomer Galileo Galilei experimented on Simple pendulum and found that it is 1
taking 100 sec to complete 50 oscillations. Find the time-period for the astronomer.
a) 20 sec
b) 2 sec
c) 0.2 sec
d) 0.5 sec
11. A simple pendulum takes 15 sec to complete 5 oscillation .What is the time-period 1
of pendulum?
a) 0.3 sec
b) 30 sec
c) 3 sec
d) 3 min
12. Raghav experimented on simple pendulum and calculated the time period as 2 1
sec. What is the frequency of the pendulum?
a) 1 Hz
b) 0.2 sec
c) 0.2 Hz
d) 0.5 Hz
13. Assertion: Simple pendulum oscillates faster when brass bob is used as compared 1
to foam bob.
Reason: Time period depends upon mass of the bob.
14. Assertion: Time period of Simple pendulum increases if length of string is
increased. 1
Reason: Time period is inversely proportional to the length of the string.
Subjective Questions:
15. ……………..performed experiments on simple pendulum to measure time. 1
16. The body repeats the motion at equal interval of time is…………….. 1
17. Time period of Big Ben Pendulum is………………. 1
18. The bob of pendulum swings in …………. direction. 1
19. Write the relation between time period and frequency. 1
20. Calculate the time period of pendulum showing 50 complete cycle of to-and –fro 2
motion in 100 seconds.

21. I. Write the construction of simple Pendulum. 2+3
II. Define the following terms:
a) Time period
b) Frequency