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32. A pulse was created in a string/slinky of length 4m by a group of 4 students. They observed that it returned after
reflection at the point of creation 6 times in 10 sec and calculated the speed as follows student:
P
Q
Speed in m/s
0.4
2.4
R
S
4.8
9.6
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Student
The correct speed was calculated by the student (A) P
(B)Q
(C)R
(D)S
Ans: R
33. Which Structure helps the pupae of mosquito to swim in water?
(B) Fins
(C)Paddles
(D)Tracheal gills
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(A) Feathers
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