National Science Olympiad Forum By SOF Olympiad Trainer - Page 519
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Nilanjana De from Delhi Public School North, Bengaluru
Subject :NSO    Class : Class 7

Ans 1:

Neil Pathak from GD Goenka Public School, Paschiim Vihar, New Delhi
Class : Class 9
wrong ques

Ans 2:

Kushal from Chirec, Hyderabad
Class : Class 7

Ans 3:

Arnav Nandan from ST PETERS COLLEGE AGRA, Agra
Class : Class 7
Wrong question. NICE

Ans 4:

Anuraaj Salunkhe from St Gregorios High School, Mumbai
Class : Class 9
None of the options are correct.

Ans 5:

ARNAV BARANWAL from KPS SCHOOL, bhilai
Class : Class 8
wrong question

Ans 6:

Mahadevan from KV Rubber Board Kottayam, Kottayam
Class : Class 5
yes wrong ques

Ans 7:

Anshuman D from MVM, Hyderabad
Class : Class 9
It is meaningless

Ans 8:

Harsh Kakaria from The creek planet school, Hyderabad
Class : Class 8
it is completely wrong

Ans 9:

Ahaan Pathak from Treamis World School, Bangalore
Class : Class 8
This question is absolutely wrong

Ans 10:

Koina Rautkar from DAV ispat sr sec public school , Dalli rajhara
Class : Class 7

Ans 11:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7

Ans 12:

yash kirpalani from st gregorios high school chembur, Mumbai
Class : Class 7
none of the options are correct.

Ans 13:

Daksh from RKC, Rajkot
Class : Class 8

Ans 14:

Anusha from LBS School , Kota
Class : Class 10
Wrong question

Ans 15:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
this is wrong . all the options are wrong .

Ans 16:

Ishan Patil from D.A.V. B.O.R.L. Public School ,Bina, Bina
Class : Class 8
Absolutely Right question matches with the image in question

Ans 17:

Aahana from St. Andrews School, Hyderabad
Class : Class 7
Wrong Question

Ans 18:

Adhrit from CHSV, Chennai
Class : Class 8
Completely wrong image in the question, it makes no sense

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Gauri Chaturvedi from St. Joseph Convent, Jabalpur
Subject :NSO    Class : Class 6

Ans 1:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
AN INSULATOR (C)

Ans 2:

VIJAYA SREYAS B from NARAYANA OLYMPIAD SCHOOL KUKATPALLY, HYDERABAD
Class : Class 6
Wood is a bad conductor of heat. This results in very slow heating of wood. This principle is used when we use wood utensils to cook food. I go by option (B).

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Mathangi Parthasarathi from ,
Subject :NSO    Class : Class 4

Ans 1:

Prakriti Singh from Ryan International School, Pune
Class : Class 4
D I guess,I am not sure

Ans 2:

Nidhesh Agarwal from Chinmaya vidyalaya, Bokaro steel city
Class : Class 4

Ans 3:

Shreyansh Saha from Dps Megacity, Kolkata
Class : Class 4
Option D

Ans 4:

Shaurya Srivastava from delhi public school, navi mumbai
Class : Class 6
how can a plant release carbondioxide???

Ans 5:

Aarav from SNBP, Pune
Class : Class 4
plants can release carbon dioxide at night only tulsi plant does not release carbon dioxide

Ans 6:

Aayush Reddy Bomidika from Delhi Public School Nacharam, Hyderabad
Class : Class 9

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Mrs Punita from Ramjas school R.K.Puram, New Delhi
Subject :NSO    Class : Class 7

Ans 1:

Yashna Badiye from sagar public school saket nagar, Bhopal
Class : Class 8
as larva produces and when it is fully produced it forms a cocoon

Ans 2:

Aviral Yadu from Krishna Public School Dunda Raipur, Raipur
Class : Class 7
Ans C

Ans 3:

Shlok from Tomoae , Amravati
Class : Class 7
it must be c . at cocoon stage silk is already produced

Ans 4:

Ronav Kerkar from Jamnabai Narsee School, Mumbai
Class : Class 7
admin please answer

Ans 5:

Krishna Patidar from Advanced Academy, Indore
Class : Class 8
No, the answer is 'C' only. In pupa stage the silk fiber is only obtained, but actually it is produced by larva and in question it is asked which stage produces fiber. Hence, the answer is 'C".

Ans 6:

Parth Gupta from Presidium Gurgaon, Gurgaon
Class : Class 8
answer is c because in the pupa stage the silk is already produced and in the larvae stage it produces silk when it is ready to go in the next stage of its life

Ans 7:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 8
really confusing ... the answer option d is correct in the sense that produces means extracting the silk or when it is ready to extracted by humans. but option c is correct when produces means that when larva , itself after the fourth moult stage produces silk.

Ans 8:

Sanjaykumar S from Velammal, chennai
Class : Class 7
ans:c,you may think d,but only in larval stage it produce silk in option d it is in a cocoon stage it cannot produce silk

Ans 9:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
I THINK THE ANSWER IS C

Ans 10:

reechik ghosh from dps, farakka
Class : Class 7

Ans 11:

Yashna Badiye from sagar public school saket nagar, Bhopal
Class : Class 8
no it is c

Ans 12:

Ashwak from Cambridge, Jalandhar
Class : Class 8
Answer should be C ,as only larvae in the life cycle of moth produce silk fibres , pupa or cocoon does NOT make silk fibres . They only undergo change in stage IN the silk fibres. They do not have the ability to produce silk fibres !

Ans 13:

Bhumi Chheda from SVKM J V Parekh International School, Mumbai
Class : Class 9
it is c because the silk has already started getting produces when it is larva

Ans 14:

Aayush Reddy Bomidika from Delhi Public School Nacharam, Hyderabad
Class : Class 9

Ans 15:

Mradul from Modern public school bhiwadi, Bhiwadi
Class : Class 7
IT IS 'D' BECAUSE AT COCOON STAGE THE CATERPILLAR PRODUCES SILK FIBRES AND KNOTS AROUND IT AND COVERS HIMSELF.AFTER SOME TIME THE SILK FIBRES GETS HARDEN DUE TO THE GUMMY SUBSTANCE WHICH THE CATERPILLAR PRODUCES............IT IS CALLED "FIBROIN" WHICH IS MADE UP OF PROTEINS.ON HEATING THE COCOONS IN WATER THE SILK AGAIN BECOMES SOFT AND IS EXTRACTED FROM COCOONS........THIS PROCESS IS CALLED "REELING OF SILK"

Ans 16:

D VISHNU from NARAYANA SCHOOL, CHENNAI
Class : Class 7
the answer is d only in the cocoon stage they are heated in the hot water so that the reproducing caterpillar will die and it will be very easy to extract silk fiber from it.

Ans 17:

Arushi from Indira National School, Pune
Class : Class 9
also felt d but explanation provided above makes me feel c

Ans 18:

Hritvi from Podar International School, Mumbai
Class : Class 7
OPTION C

Ans 19:

AARAV AGRAWAL from BIRLA DIVYA JYOTI, SILIGURI
Class : Class 7
This is a trick question.. It says 'produced', not 'obtained'.. The larvae produce the silk fibre, then it is obtained from cocoon..

Ans 20:

Ryan Ganguly from Ebenezer International School, Bangalore
Class : Class 8
The answer is C as at that time of a Silkworms life it will produce silk. With that silk they will make a cacoon and then they will become a Moth. While it is a Pupa it does not have the ability to make Silk hence the answer is C

Ans 21:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
I thought the silk is obtained from the cocoon

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Ishan Sinha from Navrachana School Sama, Vadodara Gujarat
Subject :NSO    Class : Class 6

Ans 1:

Rohan TR from Sri Aurobindo memorial school, Bangalore
Class : Class 6
@Aditya Kumble Same

Ans 2:

Pratyush Pranjal Rai from GRM, Bareilly
Class : Class 7
CEZY PZY LEMONS SQUEEZY PIZA CHEEZY

Ans 3:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
C

Ans 4:

Adithya Kumble from Deens Academy, Bangalore
Class : Class 7
how dumb am i thought c wrote d

Ans 5:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
c

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Swati from Ryan, Bengaluru
Subject :NSO    Class : Class 8

Ans 1:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8

Ans 2:

Het Aryan from Podar International School , Pune
Class : Class 8
The correct answer is B.

Ans 3: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is B.

Ans 4:

from DPS R.K. PURAM,
Class : Class 9

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Kavya Upadhyay from NVN Jamnagar, Jamnagar
Subject :NSO    Class : Class 3

Ans 1:

tanmay shinde from Delhi Public school Rau Indore , indore
Class : Class 5

Ans 2:

Riddhhima lalwani from Akshar, Kolkata
Class : Class 6

Ans 3:

Aadi Mukherjee from DPS, Durgapur
Class : Class 4

Ans 4:

MAYANK from Jain Public School, REWARI
Class : Class 8
B

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shivan iyer from dr pillai global academy, MUMBAI
Subject :NSO    Class : Class 4

Ans 1:

VANSH GARG from DPSG, GHAZIABAD
Class : Class 4
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Ans 2:

shivan iyer from dr pillai global academy, MUMBAI
Class : Class 4

Ans 3:

Sandipta Bhattacharjee from Sri Ram Narayan Singh Memorial High School, Kolkata
Class : Class 5
Answer will be A). It is because, humus is found on topsoil and not in deep layers of soil.

Ans 4:

Ananya M from SF, New Delhi
Class : Class 4

Ans 5:

shivan iyer from dr pillai global academy, MUMBAI
Class : Class 4

Ans 6:

shivan iyer from dr pillai global academy, MUMBAI
Class : Class 4
c correct

Ans 7:

Ameya Dhuri from Birla Public School, Doha
Class : Class 7
I don't know

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Pranava Sreeyush from Kennedy High the Global School, Hyderabad
Subject :NSO    Class : Class 8

Read the given statements and select the correct option.
Statement 1 : Venus is hotter than mercury though it is far away from the Sun.
Statement 2 : Cloudy atmosphere of Venus reflects almost 75 percent of the sunlight that falls on it.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.


if it reflects lot of sunlight how can it be the hottest planet??

Ans 1:

Soham from Vibgyor high, Pune
Class : Class 8

Ans 2:

Daksha Swaminathan from Horiozon Scholars and Neo Kids, Mumbai
Class : Class 8

Ans 3:

Yash Bindal from Global Indian International School, Singapore
Class : Class 9

Ans 4:

Harshit from Army Public School, Lucknow
Class : Class 9
Hi friend. The ans is b. It is the hottest planet because of large amount of CO2 in it which causes greenhouse effect. It is true that it reflects sunlight but this is not the reason for it being hot. HOPE THIS HELPS YOU!!!

Ans 5:

Neh singla from Delhi public school, Chandigarh
Class : Class 5
hi

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Pranava Sreeyush from Kennedy High the Global School, Hyderabad
Subject :NSO    Class : Class 8

Ans 1:

NAMAN HARITASH from DPS DLF CITY, GURGAON
Class : Class 9
the answer is not correct

Ans 2:

Student from School, City
Class : Class 5
As per solution, 243 days is longer than a year.

Ans 3:

Pratyush Singh from St. John's School Marhauli, Varanasi
Class : Class 8
Hii, This means that you gotta name the planet which takes more than one Earth year i.e. more than 365 days to complete one rotation on its axis...Answer is Jupiter

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