Subject :NSO Class : Class 8
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. Which of the following statements is correct regarding this?
(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.
Ans 1:
Class : Class 8
Ans 2:
Class : Class 9
synopsis says something different than the solution