National Science Olympiad Forum By SOF Olympiad Trainer

Celoney Garg from ,

Subject :NSO Class : Class 5

Read the given statements and select the correct option.
Statement 1: Naphthalene balls kept in woollen clothes reduce in size after sometime.
Statement 2: Solid naphthalene balls change into gas due to the warmth of woollen clothes.

ABoth statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
CStatement 1 is correct but statement 2 is incorrect.
DBoth statements 1 and 2 are incorrect.

can somebody explain ,,how warmth comes from stored woollens

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Ans 1:

Shambhavi from Ryan international school, New Delhi

Class : Class 6

Option (a)

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Priyanka Ravi from ,

Subject :NSO Class : Class 5

Ashish was performing an experiment by setting up an arrangement as shown below. He kept three different types of soil in the three funnels. Then, he added 70 mL of water to each of the funnels. The setup was kept undisturbed for an hour.

Which of the following relations holds correct regarding the amount of water present in the three beakers after an hour?

AClay > Loam > Sand
BClay > Sand > Loam
CSand > Clay > Loam
DSand > Loam > Clay

how is it ?explain.

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Ans 1:

Celoney Garg from ,

Class : Class 5

sand does not absorb water and allows water to pass through it .similarly water in 2nd container absorbs water more than 3rd container . same happens in1st and 3rdcontainers

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sayed afeeq from Symga English school, Surat

Subject :NSO Class : Class 5

From where we get study material in the market.

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Sharad Jain from Presidium, Ghaziabad

Subject :NSO Class : Class 5

Which of the statements is correct?

AOil spills over oceans and seas kill birds and fish.
BFertilisers used to increase crop yield causes air pollution.
CWater pollution leads to soil erosion.
DAfforestation destroys habitat of land animals.

how birds???

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smarty from VVM , Chennai

Subject :NSO Class : Class 7

The given picture shows an aquatic plant.

How does the plant adapt itself to its environment?

(i) Its roots contain air spaces to help it keep afloat.

(ii) It has leaves at the surface of the water to enable them to obtain sunlight.

(iii) It has waxy surface on the leaves to prevent water from collecting on them.

(A) (i) & (ii)

(B) (ii) & (iii)

(C) (i) & (iii)

(D) (i), (ii) & (iii).

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Ans 1:

anirudh_suresh@rocketmail.com from bangalore international academy, Bengaluru

Class : Class 7

B

Ans 2:

Jayasuriyha Mohanraj from SSM School, Chrompet, Chennai - 600044, Chennai

Class : Class 7

i think the answer is B because they are asking above water adaptations

Ans 3:

Sahi Gupta from kothari international school, Ghaziabad

Class : Class 7

b

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Dipam from Podar International School, Aurangabad

Subject :NSO Class : Class 5

Fruit M and fruit N are both dry. Fruit M is light and has a papery skin. Fruit N is long and has a slit along its side. How are the seeds of the fruits M and N dispersed?

AM: By wind; N: By animals
BM: By wind; N: By splitting
CM: By splitting; N: By wind
DM: By water; N: By animals

(B) Light weight and papery skin of a fruit are adaptations to float in air from a long time. The seeds along with the fruit get dispersed to long distances by floating in air. Fruit N has a slit along its side. It indicates that the seeds are dispersed by splitting of the fruit along the slit when matured. There is a line where splitting occurs after maturation, exposing the seeds which will fall from the fruit.

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Ans 1:

from ,

Class :

With wide variety of dryfruits, from Pistachios from the Farms of Iran to Kashmiri Walnuts to Californian Almonds to Goan Cashews and many other Dryfruits, get all this from https://www.dryfruitkart.in

Ans 2:

Archit Raj from Little ANGELS school , Munger

Class : Class 5

B

Ans 3:

from ,

Class :

Gifts are the best resone to make a relationship with anyone. If any gift- including health wellness things, it would definitely make more strong relation. We are dryfruit suppliers in Vashi all over India. We are happy if our customer well and healthy. Buy online all wholesale dry fruits in Navi Mumbai. https://www.dryfruitkart.in/

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Ainesh Banerjee from The Shri Ram School Aravali, Gurgaon

Subject :NSO Class : Class 6

Which three of the following statements explains why solid particles have a definite shape?

AThere is a strong force of attraction between the particles.
BThey can be compressed.
CThey are packed together very tightly.
DThey are arranged in a regular way.

Where are the options?

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Ans 1:

Tanvi T from Arsha Vidya Mandir, Chennai

Class : Class 8

both a and c

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Raavi from DPS, Ranchi

Subject :NSO Class : Class 4

Read the given flow chart showing energy conversion and identify P - S.

P ------------- Q ------------- R ------------- S
ACar ----- Solar cooker ---- Windmill ----- Walking
BFan ----- Mango tree ----- Car ----- Sleeping
CMicrowave ----- Radio ----- Climbing ----- Reading
DBulb ----- Grass ----- Hydroelectricity ----- Running

How in case of fan electrical energy is converted to light and in case of sleeping chemical energy is converted to kinetic

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Ans 1:

Jaytra lohia from Lvis - noida, Ghaziabad

Class : Class 5

the correct answer is d

Ans 2:

Praket Tejas from Delhi Public School Indira Nagar Lucknow, Lucknow

Class : Class 4

d

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Kaavya from Delhi public school , Kolkata

Subject :NSO Class : Class 5

Read the given paragraph. The American spacecraft Apollo - 7 carrying three passengers viz. Neil Armstrong, Edwin Aldrin and Yuri Gagarin landed on Moon on 21st July, 1979. This was a remarkable day in the history of mankind. They left a flag of NASA there which was specially designed to stay taut on the Moon, where there is no air. There are some errors in the given paragraph. Select the option that correctly identifies their number.

A2
B3
C4
D5

what are the 5 errors in the paragraph

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Ans 1:

Debarshee Rakshit from DPS Megacity, Kolkata

Class : Class 8

1) Apollo - 7 2) Yuri Gagarin 3) 21 st July,1979 4) Flag of NASA 5) stay taut on the moon .

Ans 2:

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi

Class : Class 7

Ans 3:

Anirudh from indira, Pune

Class : Class 5

A

Ans 4:

Pragun goel from Venkateshwar International School, Delhi

Class : Class 8

what do they want to check?

Ans 5:

Navya GUPTA from dps noida, Noida

Class : Class 3

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N R MISHRA from k v 2 kalpakkam, chennai

Subject :NSO Class : Class 7

Rhizobium bacteria P and leguminous plants Q are in symbiotic relationship whereas mole R is the predator of leguminous plants. Which of the following graphs, correctly represents their relationship?

A
B
C
D