| Direction: Read the given paragraph and answer the following questions. |
| Two metal rulers of lengths 30 cm and 60 cm are kept in such a manner that a 30 cm ruler extends about 15 cm over the edge and a 60 cm ruler extends about 30 cm over the edge. Both the ends are flicked. |
| (i) The metal ruler of length 30 cm is able to vibrate slower. |
| (ii) The metal ruler of length 30 cm produces a high pitch sound. |
| (iii) The metal ruler of length 60 cm is able to vibrate faster. |
| (iv) The metal ruler of length 60 cm produces a low pitch sound. |
A) Only (i) and (iii) are correct.
B) Only (ii) and (iv) are correct.
C) Only (i) and (iv) are correct.
D) Only (ii) and (iii) are correct.
Correct Answer: B
Solution :
A smaller length of the ruler vibrating i.e., 30 cm is able to vibrate faster. This increases the frequency of vibration. Hence the pitch of the sound produced is high. A larger length of the ruler vibrating produces a low pitch sound.
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