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Tanay Jha from Father Agnel School, indirapuram
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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Eshaan from Kamala Niketan Montessori School, Trichy
Subject :NSO    Class : Class 1

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Samarth Vijay Yeliathaya from Shri Kumarans Children home,cbse, Bangalore
Subject :NSO    Class : Class 4

Ans 1:

Samarth Vijay Yeliathaya from Shri Kumarans Children home,cbse, Bangalore
Class : Class 4
c is the answer

Ans 2:

Samarth Vijay Yeliathaya from Shri Kumarans Children home,cbse, Bangalore
Class : Class 4

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Anaisha Niranjan from DPS Noida, Noida
Subject :NSO    Class : Class 2

Ans 1:

Anaisha Niranjan from DPS Noida, Noida
Class : Class 2

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Suraj Gupta from Suncity World School, Gurugram
Subject :NSO    Class : Class 4

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ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
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:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 6
is sof olympiad trainer mad?where is the figure?is it really mad?or it doesnot know english?

Ans 2:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 6
g

Ans 3:

Dushyant Singh from Shree Ram Centenial School, Indore
Class : Class 6
same here by the way the answer is c

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SONAL MUKUND SHINDE from PODAR INTERNATIONAL SCHOOL SANGLI, TASGAON
Subject :NSO    Class : Class 7

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Ram from BVM BHS, Chennai
Subject :NSO    Class : Class 6

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Satwik Roychoudhury from St.Stephens School, Kolkata
Subject :NSO    Class : Class 1

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Suraj Gupta from Suncity World School, Gurugram
Subject :NSO    Class : Class 4

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