National Science Olympiad Forum By SOF Olympiad Trainer - Page 716
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Anantha Narayanan M S from NPS Goaplapuram Chennai, Chennai
Subject :NSO    Class : Class 6

Ans 1:

Arsh from Lahs, Gwalior
Class : Class 3

Ans 2:

Sanjana Iyer from HFS Powai, Mumbai
Class : Class 9

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Anantha Narayanan M S from NPS Goaplapuram Chennai, Chennai
Subject :NSO    Class : Class 6

Ans 1:

R Banik from Delhi Public School Raipur , Raipur
Class : Class 3
Earth wire is always to prevent from electric shock when metal case comes in live wire, in that case current flow to earth and it prevents electric current pass through human body

Ans 2:

Anushka Hazarika from DPS Megacity, Kolkata
Class : Class 2
I think the answer should be B - if earth wire is connected to the fuse (which will burn out after a certain threshold of current passes thru' it) , it will not prevent a shock.

Ans 3:

Amogh from CLMSishya, Chennai
Class : Class 7

Ans 4:

PARNIKA SINGH from GYAN GANGA EDUCATION ACADEMY, RAIPUR
Class : Class 10
the answer should be b because the earth wire should be connected to the metal case. Current caring wire should be connected with the fuse.

Ans 5:

Ashwak from Cambridge, Jalandhar
Class : Class 8
The answer is B as metal case is only conductor and if fuse is connected it would be blown off

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Anantha Narayanan M S from NPS Goaplapuram Chennai, Chennai
Subject :NSO    Class : Class 6

Ans 1:

Shomili from Global Indian International School, Singapore
Class : Class 9
The answer should be B

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SANJAY MANOCHA from ST FRANCIS DE SALES SENIOR SECONDARY SCHOOL JANAKPURI NEW DELHI, New Delhi
Subject :NSO    Class : Class 6

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Harsh from D.A.V.PUBLIC SCHOOL PATIALA, Patiala
Subject :NSO    Class : Class 6

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Dhruv from na, Udaipur
Subject :NSO    Class : Class 6

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gunu from kendriya vidyalya no1, Cuttack
Subject :NSO    Class : Class 5

Ans 1:

Devina kashyap from TPS, Mumbai
Class : Class 4
C should be correct as when V increases U and T will also increase and when T increases then S will also increase so S will have the greatest population and U will be second populated the population of T will go as S will eat T but there is no one to eat U so S is the highest and then U (is the second highest)

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koushtubh from lakshmipat singhania academy, Kolkata
Subject :NSO    Class : Class 5

Ans 1:

Ayush Kumar from Maria Assupta Sr. Sec. Convent School, KASHIPUR
Class : Class 5
How to solve this problem. Please explain.

Ans 2:

Narayana K from DPS North Bangalore, bengaluru
Class : Class 5
How to solve this problem. Please explain

Ans 3:

Kaustubhi Reddy from Meridian hyderabad, Hyderabad
Class : Class 4
How

Ans 4:

Haroon T K from Silver Hills public school , Calicut
Class : Class 5

Ans 5:

Aarush Pathak from Vibgyor High Magarpatta City, Pune
Class : Class 6
Yes.Please explain the reason.

Ans 6:

Manish from DPS North Bangalore , Bangalore
Class : Class 10
Please explain the answer

Ans 7:

Karmanya Gupta from DPS, Udaipur
Class : Class 8

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joya ghosh from ,
Subject :NSO    Class : Class 5

Select the correct sequence of words to fill the blanks in the following sentences.

a - 1 fibres do not absorb sweat.
b - Wool is obtained from 2
c - Insects like 3 damage silk and woollen clothes.

            1                      2                      3
APolyester          Cow                Cockroach
BSilk                  Sheep               Butterfly
CWoollen           Plant                 Moth
DNylon              Sheep                Silver fish


Please sir I found this a very dicey question. Do silver fish really damage silk and woolen clothes?

Ans 1:

INDRANI GHOSH ROY from AMRITA VIDYALAYAM, Durgapur
Class : Class 5
Option no. D is correct. This is because as nylon is a synthetic fibre , it doesn't absorb sweat and also sheep is the animal from whom wool is obtained, and yes silverfish do damage silk and woollen clothes.

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Hrushikesh from DAV Public School, Thane
Subject :NSO    Class : Class 7

Ans 1:

Hritvi from Podar International School, Mumbai
Class : Class 7
Correct Option is A

Ans 2:

Aditya kumar from Sapphire International School, Noida
Class : Class 8
its "a"

Ans 3:

parijatsomani from The Global Edge School, Hyderabad
Class : Class 7
if you magnetise a material for eg if you magnetise a piece of iron with the south pole of a magnet , the side which you are magnetising will be north

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