National Science Olympiad Forum By SOF Olympiad Trainer

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

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Ans 1:

PRIYANSHU DEB from New Green Field School, Saket, New Delhi

Class : Class 7

yes both i and ii since undercoat is for socks, high quality...etc. but outer is for coarse carpets...etc

Ans 2:

Sara Kashyap from Vista International, HYDERABAD

Class : Class 7

yes..... even i think the question isnt framed properly.... we use both types of wool for different things as Priyanshu said

Ans 3:

SANVI from D PS VADODARA, Vadodara

Class : Class 9

when I opened the question paper ,questions from 29 to 31 were not visible

Ans 4:

Sargah Surya from bgsnps, Bengaluru

Class : Class 4

both types of hair are used based on their function. They must specify for what. This question is not proper

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S Nithyanth from Geethanjali Vidyalaya, Bangalore

Subject :NSO Class : Class 4

Select the option which would most closely resembles the mirror image of the given Fig. (X), if the mirror is placed along MR.

A
B
C
D

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Ans 1:

UMANG from SPRING DALE COLLAGE, Lucknow

Class : Class 8

Option C is correct

Ans 2:

S Nithyanth from Geethanjali Vidyalaya, Bangalore

Class : Class 6

Ans 3:

UMANG from SPRING DALE COLLAGE, Lucknow

Class : Class 8

Option C is correct

Ans 4:

Apoorva Gaurav from DAV, Muzaffarpur

Class : Class 5

Option c is correct.

Ans 5:

S Nithyanth from Geethanjali Vidyalaya, Bangalore

Class : Class 6

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Gauri Singh from St Johns School Marhauli, Varanasi

Subject :NSO Class : Class 6

Which of the following groups of organisms live in marine habitats?

A Whales, Crocodile, Sea turtle
B Whales, Jelly fish, Sea weed
C Fish, Frog, Tortoise
D Crab, Oyster, Duckweed

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Ans 1:

SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad

Class : Class 6

Ans 2:

Nirbhay from Podar International School, mysore

Class : Class 6

class:

Ans 3:

Krishiv Gupta from Sat Paul Mittal School, Ludhiana

Class : Class 6

Why is everyone writing there class

Ans 4:

Nirbhay from Podar International School, mysore

Class : Class 6

this was sent in 2025

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Bitan Chakraborty from Adamas international school, Kolkata

Subject :NSO Class : Class 4

former capital of Pakistan

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Ans 1:

Bitan Chakraborty from Adamas international school, Kolkata

Class : Class 10

Karachi

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Agastya Tripathi from dps gurgaon, Gurgaon

Subject :NSO Class : Class 5

Two substances, P and Q, were used to fill a syringe. The plunger was then pushed in as shown in the diagram.

Which of the following would most likely be P and Q?

A
B
C
D

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Ans 1:

Agastya Tripathi from dps gurgaon, Gurgaon

Class : Class 4

Ans 2:

Sneha Sarkar from South city international school, Kolkata

Class : Class 7

Ans 3:

Debarpan Das from Delhi Public School , Durgapur

Class : Class 9

Ans 4:

Agastya Tripathi from dps gurgaon, Gurgaon

Class : Class 4

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akshaj das from NARAYANA E TECHNO kaggdaspura, Bengaluru

Subject :NSO Class : Class 5

Which storm moves quickly in a narrow path and has rotating winds upto 300 miles per hour that kick up a cloud of dirt and debris?

(A) Hurricane

(B) Thunderstorm

(C) Tornado

(D) Monsoon

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Ans 1:

UMANG from spring dale college, Lucknow

Class : Class 7

Answer is C because tornado is very fast rotating wind which look like funnel

Ans 2:

UMANG from spring dale college, Lucknow

Class : Class 7

Answer is C because tornado is very fast rotating wind which look like funnel

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Shivam Gupta from Army Public School, Noida

Subject :NSO Class : Class 5

Riya performed an experiment as shown below.

Select the correct option regarding it.

A X could be common salt, Y could be sugar and Z could be water.
B If Y is sugar and Z is water then Y can be recovered by evaporating Z.
C Both X and Y are insoluble in solvent Z.
D X is a liquid whereas Y is a solid.

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Ans 1:

Rajrupa and Aparupa from Oxford cbse, bangalore

Class : Class 5

there are more than 5 food chains

Ans 2:

Aadya Dholaria from Elpro International School, Pune

Class : Class 6

There is a layer above the substance in 2nd beaker and the water is not looking clear

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Divam Khera from HansRaj Model School, New Delhi

Subject :NSO Class : Class 4

Which of the following statements is/are correct regarding different kinds of soils?
(i) Sandy soil is dry and light and it holds a lot of air and water.
(ii) Loamy soil is a mixture of sand and clay and is good for growing plants.
(iii) Clayey soil is formed of very fine particles and hence does not hold much of water.
(iv) Small stones and pebbles present in soil are called gravel.

A(i) only
B(ii) and (iv)
C(ii), (iii) and (iv)
D(i) and (iv)

B

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Ans 1:

Nishka Agarwal from NMAJS Mumbai, Mumbai

Class : Class 4

Class :

Ans 2:

adhrit srivastava from sanskriti , pune

Class : Class 4

Ans 3:

Devyani bansal from Blue bell school international, New Delhi

Class : Class 5

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aditya apurva from DAV public School, Duttnagar

Subject :NSO Class : Class 9

The displacement distance graph of a sound wave is shown in the figure. Which point has the maximum pressure?

A I
B II
C III
D IV

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Ans 1:

krish Singla from DELHI PUBLIC SCHOOL, BATHINDA

Class : Class 9

Ans 2:

Ankur Kumar from Delhi Public School, Ranchi

Class : Class 9

Option is the correct answer as I is the region of compression or maximum density so it experiences maximum pressure.

Ans 3:

ANUSTUP DE from AVA, ARAMBAGH

Class : Class 9

yes, it will be region I

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