National Science Olympiad Forum By SOF Olympiad Trainer

tanmay lanjewar from delhi public school nagpur, Nagpur

Subject :NSO Class : Class 5

Which of the following statements are correct?
(i) Venus is believed to have active volcanoes.
(ii) Mars has the biggest crater in the solar system.
(iii) The first seismograph was made in Germany.
(iv) Many dormant volcanoes are found around the Pacific ocean, giving rise to the name 'Pacific Ring of Fire'.

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

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vedant maheshwari from presidency school, kishangarh

Subject :NSO Class : Class 8

While swimming under-water, Ashok found that he cannot see very clearly even in absolutely clear water. This is due to

A absorption of light in water.
B scattering of light in water.
C reduction of speed of light in water.
D change in the focal length of eye lens.

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Ans 1:

Sriram from DPS Modern Indian school , Doha

Class : Class 10

could be c

Ans 2:

Anidroid ,Aniruddha from Modern DPS, Faridabad

Class : Class 8

Maybe B part.

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Darsh Singh from The Deens Academy, Bengaluru

Subject :NSO Class : Class 3

The plant shown in the figure will eventually die due to a lack of ________

(A) Air

(B) Water

(C) Sunlight

(D) Fertilizer.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is C.

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Mrudula shrinivas marathe from JBCN INTERNATIONAL SCHOOL , Mumbai

Subject :NSO Class : Class 3

What would happen if snake is completely removed from the given food chain?
Grass → Grasshopper → Frog → Snake → Peacock

a. Frog population will increase.
b. Grasshopper population will increase.
c. Peacock population will increase.
d. Peacock population will decline.

Ab and d
Ba and b
Cb and c
Da and c

how peacock population will increase when its food snake is removed from food chain?

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Ans 1:

Akshari Patil from VIBGYOR HIGH Marathalli, Marathalli

Class : Class 4

how can peacock population increase if they don't have snakes to eat ?

Ans 2:

Akshari Patil from VIBGYOR HIGH Marathalli, Marathalli

Class : Class 4

this question is wrong all options are wrong

Ans 3:

Theertha Uday from Holy Angels ISC School, Trivandrum

Class : Class 6

Yes I also think so

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Pournami from Lexicon International School Wagholi, Pune

Subject :NSO Class : Class 4

It takes 365 days for one revolution by _______.
(A) Sun on its axis

(B) Earth on its axis

(C) Moon in its orbit

(D) Earth in its orbit

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

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Kohil from Kendriya Vidyalaya, Patna

Subject :NSO Class : Class 8

Your were given a collection of bacteria and asked to distinguish them as Gram +ve and Gram –ve. The following flow chart represents the procedure of Gram staining. What are likely to be in sol. 1, sol. 2 and sol. 3?

ACrystal violet, alcohol, Janus green
BCrystal violet, iodine solution, alcohol + water
CCrystal violet, water, alcohol
DCrystal violet, water, iodine solution

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Ans 1:

tanishka Bondhare from Saraswati international school , Hingoli

Class : Class 8

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DIBYA PRASANNA RANA from DAV Public School, Haldia

Subject :NSO Class : Class 7

If '+' means '-', '-' means '×', '×' means '÷', and '÷' means '+', then find the value of
14 × 3 ÷ 11 - 3 + 101?

A
B
C
D

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Ans 1:

Saniya Wasnik from Chanda Public School, Chandrapur

Class : Class 8

Its answer is D.It is very simple we have to use 'BODMAS RULE' :)

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Anchita from Euroschool Wakad, Pune

Subject :NSO Class : Class 4

Read the following statements made by two students.
Shuchi : There are three stages in its life cycle. The young one is very similar to its parent. It is P.
Ritu : There are four stages in its life cycle. The young one is very different from its parent. It is Q.
Identify the correct option with regard to P and Q.

----------P-------------------Q
A Housefly --------Cockroach
B Butterfly --------Grasshopper
C Cockroach ------Housefly
D Cockroach ------Grasshopper

please explain

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Ans 1:

Parmanyu from Learning paths school, Mohali

Class : Class 5

i found this answer effective.

Ans 2:

Parth from St Stephens School, Chandigarh

Class : Class 5

option C

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Nikhil Kocherry from Ryan International School, Mumbai

Subject :NSO Class : Class 4

The given chart shows the number of college athletes who participated in four different sports. Find the difference between the total number of men and women who participated in all the sports?