National Science Olympiad Forum By SOF Olympiad Trainer

Akshit Ayan from Deens Academy, Bengaluru

Subject :NSO Class : Class 3

Which of these are excretory organs?

(A) (a) & (b)

(B) (b) & (c)

(C) (a) & (c)

(D) (a), (b) & (c)

please explain how (a) is excretory organ.

Ans 1:

Ansh Agarwal from BGS international public school, delhi

Class : Class 7

a..is exceretory because it exhale carbon di oxide.... answer is option A

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 7

In terrestrial plants, roots normally play a very important role in the absorption of nutrients and water from the soil. However, in aquatic plants, roots are much reduced in size. Some of these plants have narrow and thin ribbon-like leaves. These can bend in the flowing water. In some submerged plants, leaves are often highly divided.
Why are their leaves ribbon-shaped or divided ?
(a) The water can easily pass through these leaves without damaging them.
(b) They do not need to store water.
(c) They keep the plant afloat.
(d) They look pretty.

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Ans 1:

rizwana from heritage international school, daltonganj

Class : Class 10

a

Ans 2:

Ayaan from DPS DLF CITY, Gurgaon

Class : Class 8

The answer is A

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 7

In terrestrial plants, roots normally play a very important role in the absorption of nutrients and water from the soil. However, in aquatic plants, roots are much reduced in size. Some of these plants have narrow and thin ribbon-like leaves. These can bend in the flowing water. In some submerged plants, leaves are often highly divided.
Why do aquatic plants have a root system which is not very well developed?
(a) So that they can be pulled out easily.
(b) It helps them float.
(c) Since they grow in water they don't need long roots to absorb water.
(d) They do not need to absorb minerals.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is C.

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 7

In the given flow chart,

Pick the incorrect match.
(i) ----- (ii) ----- (iii) ----- (iv)----- (v)
(a) Chemical ----- Physical ----- Chemical ----- Irreversible ----- Reversible
(b) Physical ----- Physical ----- Chemical ----- Chemical ----- Chemical
(c) Irreversible ----- Chemical ----- Physical ----- Reversible ----- Chemical
(d) Irreversible ----- Chemical ----- Chemical ----- Irreversible ----- Irreversible

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Ans 1:

Ayaan from DPS DLF CITY, Gurgaon

Class : Class 8

Your ans is C

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Mithran L from The Shishukunj International School, Indore

Subject :NSO Class : Class 4

Which of the following option best shows the front view of the given figure?

(a)
(b)
(c)
(d)

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

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Ashher Pervez from DPS Bhilai, Bhilai

Subject :NSO Class : Class 5

What happens when the North poles of two magnets are held near each other ?

(A) One jumps on to the other

(B) They repel each other

(C) They attract each other

(D) Nothing happens.

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Ans 1:

Manojna from Oakridge International School, Hyderabad

Class : Class 5

B)they repel each other is the correct answer

Ans 2:

Ashher Pervez from DPS Bhilai, Bhilai

Class : Class 10

My answer is they repel each other.

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Pranav from Sri Aurobindo Memorial school, Bengaluru

Subject :NSO Class : Class 8

From which of the following maximum reflection of sound can take place?

(A) Gunny bags

(B) Metals

(C) Carpets

(D) Straw.
How is it gunny bags is the answer

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Ans 1:

Subash kandoth from New horizon public school , Navi Mumbai

Class : Class 10

Ans 2:

Dhyana Rajamunisamy from sbsm school, Chennai

Class : Class 10

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naman from PSBBM, Chennai

Subject :NSO Class : Class 5

The table below shows some properties of four different substances from the kitchen. They are mixed together in a bowl.

Substance

Colour

Dissolves in water

Passes through fine sieve

W

Green

No

No

X

White

No

No

Y

White

Yes

No

Z

White

Yes

Yes

Which of the following is the best way to separate the substances ?

(A) Pour water into the bowl and remove W and X

(B) Pick out the green substance and pour water into the remaining mixture

(C) Pick out the green substance to get W, pour water into the bowl to get X, and heat the remaining solution to get Y

(D) Pick out the green substance, put the remaining mixture into a sieve to get Z, pour water over the remaining substances in the bowl to filter X, and heat the remaining solution to get Y.