National Science Olympiad Forum By SOF Olympiad Trainer - Page 509
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Prajwal Thakur from South Point High School, Kolkata
Subject :NSO    Class : Class 3

Ans 1:

Prajwal Thakur from South Point High School, Kolkata
Class : Class 9
ojoo;j 9pu i jp[yuj7u\ p i[u0y7h'p/ 00ujy7mb[o

Post Your Answer

VAIBHAV KALVAKOTA from THE LEXICON INTERNATIONAL SCHOOL WAGHOLI, PUNE
Subject :NSO    Class : Class 8

Post Your Answer

Arjun Sankar from PSBB SS School, Chennai
Subject :NSO    Class : Class 6

Ans 1:

Anamkhan Mulla from Navrachna Sama, Vadodara
Class : Class 7
Exactly, silk smells like charred meat...and wool smells like burning hair.

Ans 2:

Mishika Singh from EISB, Bangalore
Class : Class 5

Ans 3:

harry potter from hogwarts, hogsmeade
Class : Class 6
wooooooooooooooooooooooooooooooooooooooooooooooooooooool

Ans 4:

Anika Saha from New Town School, KOLKATA
Class : Class 6
wool.wool.wool.wool.wool.

Ans 5:

Jayaditya singh from Delhi Public School, gurgaon
Class : Class 6
wooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooollllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll

Ans 6:

harry potter from hogwarts, hogsmeade
Class : Class 6
wooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooool

Ans 7:

NEELADRI MISHRA from D A V Public School. Unit VIII, Bhubaneshwar
Class : Class 7

Ans 8:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
Yes the answer should be wool

Ans 9:

Ayush Yadav from Salwan Public School, Gurgaon
Class : Class 6
It should be wool I even looked it up on the internet. It should be wool!

Ans 10:

Ishitadas from Adamas World school , Ichapur
Class : Class 8
Smell of burning silk is charred meat, where as smell of burning wool is as burned hair. So answer should be (D).

Ans 11:

Naisha from Brilliant public school b, Bilaspur
Class : Class 8
Silk smells like charred meat

Ans 12:

Ashwak from Cambridge, Jalandhar
Class : Class 8
SOF Master Answer Please explain . The answer should be WOOL

Ans 13:

Archisman Biswas from Santipur Municipal High School, Nadia
Class : Class 8
It should be wool. D is the correct answer.

Ans 14:

Shreyansh Gupta from MVN, faridabad
Class : Class 6
c is correct as the question is saying of pure fabric so the ans. should be c google --(Silk is formed of animal protein secretion of silkworms. Hence , when burnt it smells like hair , which is also composed of animal protein.

Ans 15:

Naisha from Brilliant public school b, Bilaspur
Class : Class 8
Wool

Ans 16:

Aarya Singh from Indian School Ghubra, Muscat
Class : Class 3
It should be wool. The smell of silk is charred meat.

Ans 17:

harry potter from hogwarts, hogsmeade
Class : Class 6
woolwooolwoooooooooooooool

Post Your Answer

vivaan sethi from GD goenka public school, Delhi
Subject :NSO    Class : Class 3

Ans 1:

Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon
Class : Class 7
11

Ans 2:

Mahi from BIS , delhi
Class : Class 5
ans 9

Ans 3:

Parashuram from Vibgyor, BANGALORE
Class : Class 3
Study the given food web and select the correct option for the following questions. How many food chains are there in the food web? A 9 B 11 C 13 D 16ans is c

Ans 4:

Vidhaan Srivastava from Apeejay, NEW DELHI
Class : Class 6

Ans 5:

Tejaojas Abhilash from Naipunya Public School , Kochi, Kochi
Class : Class 7
11 is correct acd acdi acde acdef acdefg acdeg hcdef hcde hcdeg hcd hbg

Ans 6:

Soumyajit Das from Hariyana Vidya Mandir, NORTH 24 PARGANAS
Class : Class 7
I think there are 9 food chains at all. Please check the diagram of the food web.

Ans 7:

Kashika Goel from DPS Noida, Noida
Class : Class 6
no 9

Ans 8:

AARAVPRADEEP SAHU from PADMASESHADRI BALBHAVAN SENIOR SECONDARY SCHOOL, CHENNAI
Class : Class 3

Post Your Answer

Vishal B from National Public School, Chennai
Subject :NSO    Class : Class 6

Which of the following statements is incorrect about the asteroids?

AThey are planet like objects, but smaller and often irregularly shaped.
BMajority of asteroids orbit in the asteroid belt between the orbits of Mars and Jupiter.
CAsteroids mainly composed of mineral and rock.
DVesta is the largest and most massive asteroid discovered.


from https://en.wikipedia.org/wiki/4_Vesta: Vesta (minor-planet designation: 4 Vesta) is one of the largest objects in the asteroid belt, with a mean diameter of 525 kilometres (326 mi).I think some error with question

Post Your Answer

Hprakash09 from Billabong high Bhopal, Bhopal
Subject :NSO    Class : Class 6

Ans 1:

rethish from Veltech, Avadi
Class : Class 3
Cobalt, Nickel, and Steel are magnetic materials. But Stainless Steel is non-magnetic. There are several different types of stainless steel. The two main types are austenitic and ferritic. Ferritic stainless steels are generally magnetic, while austenitic stainless steels usually are not. Austenitic stainless steel is stainless steel added with nickel. so, the correct answer is Option D.

Ans 2:

Sucheta from Podar, Pune
Class : Class 8

Ans 3:

Nivedhini from Vivekanada Vidyalaya Chitlapakkam, Chennai
Class : Class 9
the answer is D

Post Your Answer

Ishanvi B Nair from DPS Noida, Noida
Subject :NSO    Class : Class 1

Ans 1:

Arin Puri from Delhi Public School Noida, Nodia
Class : Class 2
answer should be B . Plant cannot die in absence of 1 food

Post Your Answer

Bhavit Bansal from Vardhman International School, Jaipur
Subject :NSO    Class : Class 5

Ans 1:

Debarpan Das from Delhi Public School , Durgapur
Class : Class 9

Ans 2:

Shweta Garg from Vibgyor high, Vadodara
Class : Class 8
Metal P expands less then Q and metal Q expands less than R. So, metal P expands less than R. If a bimetallic strip is heated it bends with metal which expands more on the outside and the metal which expands less in the inside. So the strip should bend downwards to complete the circuit for the bell to ring.Answer- A.

Ans 3:

Tasneem from FAIPS, kuwait
Class : Class 6
a

Ans 4:

Inamul from Springs, Nilambur
Class : Class 8

Ans 5:

Tasneem from FAIPS, kuwait
Class : Class 6
a

Ans 6:

tanmay chaudhry from BAL BHAVAN PUBLIC SCHOOL, New Delhi
Class : Class 4
aswer a jojojojojojojojojojojooojojjjjjojjojjjojoojjjooooojjjjjjjoooojjojojojojojojoo

Post Your Answer

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee
Subject :NSO    Class : Class 6

Read the following passage carefully. P is found abundantly in cod liver oil and is important for visual efficiency. Q is sourced from amla, tomato and citrus fruits and its deficiency may cause wounds to take longer time for healing. R is formed in our body in presence of sunlight and its deficiency in toddlers may cause deformity of legs.Now select the incorrect option regarding this.

AP can be found in spinach but not R.
BIn absence of R our body will show calcium deficiency even if it is abundant in our food.
CQ is also called B-complex as many of its varieties are available.
D P cannot be dissolved in water.


Ans 1:

Shreyasi Padihary from The Cambridge International School , Bangalore
Class : Class 6
The correct answer is C

Ans 2:

MInnal Senthil from Prakriya, Bangalore
Class : Class 5
yes.citrus fruit is vitamin c

Ans 3:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
Q is vitamin C ,not B.

Post Your Answer

Brinda Chakraverty from DPS Noida, Noida
Subject :NSO    Class : Class 5

Three different species of plants were selected by scientists who wanted to document their methods of seed dispersal. The graphs below show the approximate number of seedlings found at various radii around the parent plant.

What are the correct methods of seed dispersal of each plant?

Species 1 Species 2 Species 3
A Water Explosion Animal
B Wind Animal Water
C Wind Animal Explosion
D Explosion Water Animal


A very tough question

Ans 1:

Ashwak from Cambridge, Jalandhar
Class : Class 8
C

Ans 2:

Ayush Banerjee from DAV Pune, Pune
Class : Class 3
C) Seeds which are dispersed by wind are usually carried to far off places due to their small size and light weight, e.g. , seeds of cotton and dandelion. similarly, seeds dispersed by water are also light and can easily float and carried to far off places by water, e.g. , seeds of coconut. dispersed by animals seeds of guava can be carried by human beings and animals to nearer as well as long distance from the parent plant. Explosive action of some seeds peas and balsam scatter away from the parent plant but it usually cannot enable the seeds to be dispersed far off places.

Ans 3:

Navyaa Kalra from DPS Noida, NOIDA
Class : Class 5
ANS IS C!!!!!!!!!!!!!!!!!!!!!

Ans 4:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 5:

Sumit Biswal from Dps gandhinagar, Gandhinagar
Class : Class 8

Ans 6:

RISHABH from BHARATIYTA VIDYA BHAVAN, KOLKATA
Class : Class 9
thanks

Ans 7:

Piyush Kumar Pruseth from Sri Aurobindo Integral Education and Research Centre, Rajgangpur
Class : Class 5
Answer is C

Ans 8:

Ayush Banerjee from DAV Pune, Pune
Class : Class 3
C) Seeds which are dispersed by wind are usually carried to far off places due to their small size and light weight, e.g. , seeds of cotton and dandelion. similarly, seeds dispersed by water are also light and can easily float and carried to far off places by water, e.g. , seeds of coconut. dispersed by animals seeds of guava can be carried by human beings and animals to nearer as well as long distance from the parent plant. Explosive action of some seeds peas and balsam scatter away from the parent plant but it usually cannot enable the seeds to be dispersed far off places.

Post Your Answer