National Science Olympiad Forum By SOF Olympiad Trainer

Triguna from Kendriya Vidyalaya No.1 Salt Lake, Kolkata

Subject :NSO Class : Class 8

The given table represents the properties and uses of a few plastics.

The plastics represented incorrectly are

A I and IV only
B I and III only
C II and III only
D I, III and V only.

Wrong answer ... How can bakelite be thermoplastic?

Ans 1:

Sanjeev Kumar from Mount Litera Zee School, Jhansi

Class : Class 8

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AYUSH MANDAL from SALTBROOK SCHOOL, DIBRUGARH

Subject :NSO Class : Class 9

Kepler's third law states that square of period of revolution (T) of a planet around the sun is proportional to third power of average distance r between the sun and the planet i.e. T² = Kr³ (here K is constant). If the masses of sun and planet are M and m respectively then as per Newton's law of gravitation, force of attraction between them is F = GMm/r², here G is gravitational constant.
The relation between G and K is described as

A K = G
B K = 1/G
C GK = 4π²
D GMK = 4π²

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Ans 1:

Ankur Kumar from Delhi Public School, Ranchi

Class : Class 9

Correct ans:D. The gravitational force is equal to the centripetal force acting between the Sun and Planet. GMm/r^2=Mv^2/r =>v^2=Gm/r. Also,T=2(pi)r/v. Squaring both the sides we will get

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from , Nanded

Subject :NSO Class : Class 9

Direction : Refer to the given dichotomous key regarding cell organelles and answer the questions 49 and 50.

AP can be ER and Q can be Golgi apparatus.
BR can be chloroplasts and S can be ribosomes.
CP can be nucleus and T can be ribosomes.
DR can be mitochondria and S can be lysosomes.

The above question has 2 correct answers C and D.

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Bhagyesh Kamal from DPS, Mumbai

Subject :NSO Class : Class 7

If four identical balls are dropped at the same time and from the same height, which ball will land first?

ABall 1
BBall 2
CBall 3
DBall 4

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Ans 1:

KRITHIGHA SHRI M P from KAMALA NIKETAN MONTESSORI SCHOOL, TRICHIRAPPALLI

Class : Class 8

option B is the correct answer

Ans 2:

from ,

Class : Class 7

Ball 2 will fall first

Ans 3:

hridbeg choudhury from centre point school, nagpur

Class : Class 7

ball 2 as it's parachutes surface area is less

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student from school, city

Subject :NSO Class : Class 6

Ridhan classified animals in four groups on the basis of their feeding habits. In doing so, he wrongly placed one animal in one of the groups. Identify this group and select the correct option.

A Giraffe, rabbit, wildebeest and deer
B Crocodile, crow, snake and eagle
C Leech, mosquito, lice and bed bug
D Tiger, snow leopard, wolf and lion

CROW IS AN OMNIVORE NOT A CARNIVORE AS MENTIONED IN THE SOLUTION

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Ans 1:

sujata patel from Podar International, Pune

Class : Class 6

i have been recently taught about this in school. eagle is a carnivore

Ans 2:

Ashi Goyal from Sacred heart convent school,raikot road,barnala, punjab

Class : Class 6

Ans 3:

Subhang Deep Sahu from Narayana CO Kadugodi Bangalore, Bangalore

Class : Class 8

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Aaryan from New horizons public school , Mumbai

Subject :NSO Class : Class 8

The given figure shows a typical animal cell with its parts being labelled as 'a - j'. Identify the labelled parts and select the incorrect option regarding it.

A The organelles e, h, g and i are membrane-bound organelles which function in close coordination with one another.
B 'f' organelle is responsible for the synthesis of fats inside the cells and it stores Ca²⁺ for release during muscle contraction.
C a and b have selective permeability i.e., they allow only selected substances to pass inwardly.
D 'j' is the site for protein synthesis. It allows hereditary message from 'd' to get translated into proteins.

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Ans 1:

Praganya from GPS, Bengaluru

Class : Class 8

Ans 2:

Anshuman D from MVM, Hyderabad

Class : Class 9

But ribosomes don't have membrane

Ans 3:

Anshuman D from MVM, Hyderabad

Class : Class 9

But ribosomes don't have membrane

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Soham from DPS Whitefield, Bangalore

Subject :NSO Class : Class 5

The given set-up shows the separation process of a mixture of water and materials X and Y. X and Y respectively could be_______.

AMud and salt
BSalt and sugar
CSugar and salt
DMud and clay

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Ans 1:

Sarayu Pasupunuri from Gitanjali primary school, Hyderabad

Class : Class 5

didnt understand

Ans 2:

Arnav from Kkps, Nanded

Class : Class 5

did not label properly

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Mayank Sandh from Delhi Public School Bhilai, Bhilai

Subject :NSO Class : Class 9

Refer to the given flow chart and select the incorrect statement regarding W, X, Y and Z.

A W could be abundant in RBCs whereas X could be absent in xylem parenchyma.
B Y provides energy during starvation whereas Z provides surface for synthesis of steroid hormones.
C W helps in synthesis of proteins whereas Y secretes enzymes which are used for breaking limiting membrane of eggs.
D X could provide intermediates for the synthesis of certain steroids and cytochromes whereas Z stores calcium for release during muscle contraction.

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Arkodyuti Maiti from KDAV, Jamnagar

Subject :NSO Class : Class 7

The hairy skin of the sheep has two types of fibres that form its fleece: (i) the coarse beard hair and (ii) the fine soft under hair close to the skin. Which of the hair provide the fibres for making wool?

A(i)
B(ii)
C(i) and (ii)
DNone of these

But for making what is not mentioned like for making sweater or carpet