National Science Olympiad Forum By SOF Olympiad Trainer

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

Ans 1:

Nirbhay from Podar International School, mysore

Class : Class 6

class:

Ans 2:

Nirbhay from Podar International School, mysore

Class : Class 6

this was sent in 2025

Ans 3:

Krishiv Gupta from Sat Paul Mittal School, Ludhiana

Class : Class 6

Why is everyone writing there class

Ans 4:

SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad

Class : Class 6

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Bitan Chakraborty from Adamas international school, Kolkata

Subject :NSO Class : Class 4

former capital of Pakistan

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

Ans 1:

Agastya Tripathi from dps gurgaon, Gurgaon

Class : Class 4

Ans 2:

Agastya Tripathi from dps gurgaon, Gurgaon

Class : Class 4

Ans 3:

Debarpan Das from Delhi Public School , Durgapur

Class : Class 9

Ans 4:

Sneha Sarkar from South city international school, Kolkata

Class : Class 7

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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

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.

View All Answers (2)

Ans 1:

Rajrupa and Aparupa from Oxford cbse, bangalore

Class : Class 6

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

View All Answers (3)

Ans 1:

Devyani bansal from Blue bell school international, New Delhi

Class : Class 5

Ans 2:

Nishka Agarwal from Nita Mukesh Ambani International School, Mumbai

Class : Class 5

Class :

Ans 3:

adhrit srivastava from sanskriti , pune

Class : Class 4

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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

View All Answers (3)

Ans 1:

ANUSTUP DE from AVA, ARAMBAGH

Class : Class 9

yes, it will be region I

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:

krish Singla from DELHI PUBLIC SCHOOL, BATHINDA

Class : Class 9

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Kushal from Chirec, Hyderabad

Subject :NSO Class : Class 6

The given table shows the degree of angular movement shown by three different skeletal joints X, Y and Z.

Skeletal joint	Degree of movement
X	360°
Y	180°
Z	0°

Which of the following statements is correct regarding this?

(A) Joint X can be the joint between shoulder bone and arm.

(B) Joint Y can be the elbow joint.

(C) Joint Z can be the joint between upper jaw and rest of the skull.

(D) All of these

View All Answers (2)

Ans 1:

Sourish from viraj, Boisar

Class : Class 6

Elbow joint shows 90 degree hence only option a and c

Ans 2:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

option D is right.

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Kushal from Chirec, Hyderabad

Subject :NSO Class : Class 6

Light rays undergo regular reflection at ________.

(A) A piece of cloth

(B) The Moon surface

(C) A whitewashed wall

(D) The calm surface of a lake

View All Answers (1)

Ans 1:

Ankit Kumar from Kskdndkd, Hsmss

Class : Class 6

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aditya apurva from DAV public School, Duttnagar

Subject :NSO Class : Class 9

In an experiment, hydrochloric acid was reacted with calcium carbonate at room temperature and pressure. If 80 cm³ of gas X was produced then, the number of molecules and mass of gas X given off are respectively

A 3.33 × 10^-3, 0.5 g
B 2.15 × 10²¹, 0.157 g
C 6 × 10²³, 7.5 g
D 4 × 10²¹, 1.5 g

is there anyone who can explain this question's solution

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