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Subject :NSO    Class : Class 9

A man standing in front of a large wall claps at a regular frequency of 10 Hz. He finds that the echoes coincide with his clapping. (The speed of sound in air is 330 m s-1.)
(i) Time taken between successive clapping is 0.1 s.
(ii) The distance between the man and the wall, after he stops clapping, if he hears one more echo is 33 m.
(iii) The distance between the man and the wall, after he stops clapping, if he hears four more echoes is 66 m.

A Only (i) and (ii) are correct.
B Only (ii) and (iii) are correct.
C Only (i) and (iii) are correct.
D All (i), (ii) and (iii) are correct.


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Subject :NSO    Class : Class 1

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
c is the answer

Ans 2:

Class : Class 4

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 2

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 6

The given figure shows two iron nails X and Y hanging from a magnet. Which of the following statements are correct?
I. Top of nail Y is north pole and bottom of nail Y is south pole.
II. Top of nail X is north pole and bottom of nail X is south pole.
III. Magnetic properties are induced into both the nails X and Y.
IV. Magnetic properties are induced into the nail X only.

AI and II only
BII and III only
CI, II and III only
DI, III and IV only


where is the figure???is sof madi think it isor it does not know english

Ans 1:

Class : Class 6
is sof olympiad trainer mad?where is the figure?is it really mad?or it doesnot know english?

Ans 2:

Class : Class 6
g

Ans 3:

Class : Class 6
same here by the way the answer is c

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 1

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Subject :NSO    Class : Class 4

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