National Science Olympiad Forum By SOF Olympiad Trainer - Page 171
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Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon
Subject :NSO    Class : Class 4

Ans 1:

mishika tripathi from DPS, Gurugram, Haryana
Class : Class 5
pls explain how ans is B

Ans 2:

Emma Miriam George from Sophia High School, Bangalore
Class : Class 3

Ans 3:

Shaswat Agarwal from The Maurya School, Gurgaon
Class : Class 3
the answer is B as the chemical energy is first being used so only B option has the first letter as chemical energy.

Ans 4:

asmi raut from kohana, kawasaki
Class : Class 4

Ans 5:

Emma Miriam George from Sophia High School, Bangalore
Class : Class 3

Ans 6:

Divyansh Baladitya Singh from Delhi Public School, Patna, Patna
Class : Class 6
Yes, please explain how answer is B

Ans 7:

Divyansh Baladitya Singh from Delhi Public School, Patna, Patna
Class : Class 6
Battery has chemical energy which is converted into kinetic energy

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Dushyant Singh from Shree Ram Centenial School, Indore
Subject :NSO    Class : Class 6

Ans 1:

Pratham Dave from GNS, Bangalore
Class : Class 7
B

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Dushyant Singh from Shree Ram Centenial School, Indore
Subject :NSO    Class : Class 6

Some commonly occurring changes around us are classified in the given table.

S.
No.		 Change Reversible
change		 Physical
change
I. Melting of ice
cream		 ✓ ✓
II. Burning of
crackers		 ✓ ✗
III. Stitching a shirt
from a fabric		 ✓ ✓
IV. Dissolving
baking soda in
water		 ✓ ✓
V. Baking of cake ✗ ✗
VI. Curdling of milk ✗ ✓

Which of the above changes are classified incorrectly?

AI, II, III and V only
BII, IV and VI only
CI, III and V only
DII, III, IV and VI only


Ans 1:

Sarang Shete from Amanora School, Pune
Class : Class 8

Ans 2:

Surya Oleti from National Public School HSR, Bangalore
Class : Class 7

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Dushyant Singh from Shree Ram Centenial School, Indore
Subject :NSO    Class : Class 6

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Dushyant Singh from Shree Ram Centenial School, Indore
Subject :NSO    Class : Class 6

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Dushyant Singh from Shree Ram Centenial School, Indore
Subject :NSO    Class : Class 6

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Dushyant Singh from Shree Ram Centenial School, Indore
Subject :NSO    Class : Class 6

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Dushyant Singh from Shree Ram Centenial School, Indore
Subject :NSO    Class : Class 6

Ans 1:

Medha Bijjaram from Prime Academy, Mumbai
Class : Class 9

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Dushyant Singh from Shree Ram Centenial School, Indore
Subject :NSO    Class : Class 6

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from Jamnabai Narsee School, Mumbai
Subject :NSO    Class : Class 2

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