National Science Olympiad Forum By SOF Olympiad Trainer

SOMRAJ HAZRA from Modern Delhi Public School, Faridabad

Subject :NSO Class : Class 3

Find the missing number in the pattern below. 7982, 7992, ? , 8012, 802

(A) 7002

(B) 8002

(C) 7993

(D) 8902
it is very di

Ans 1:

Admin from Revisewise, Noida

Class : Class 3

7982 + 10 = 7992 + 10 = 8002 + 10 = 8012 + 10 = 8022 Answer will be B

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Adivishnu SP from Delhi Public School Nadergul, Hyderabad

Subject :NSO Class : Class 4

Which of the following are NOT means of mass communication?
a. Telephone
b. Magazine
c.   Postcard
d. Newspaper
e.  Television
f.   Radio

A a , b and d
B d , e and f
C b and c
D a

Can I get an explanation for this

Ans 1:

Meghav Ladani from zydus school for excellence, ahmedabad

Class : Class 8

Ans 2:

Archit Das from NPS, Singapore

Class : Class 6

Ans 3: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

Ans 4:

Vivaan from Rustomjee Cambridge International School and Junior College, Mumbai

Class : Class 6

Ans 5:

Vivaan A V from Loyola school, Jamshedpur

Class : Class 4

NONE OF THE ANSWERS ARE CORRECT!!IT IS 'A' AND 'C' SOF!PLZ CORRECT IT

Ans 6:

Nithya Soman from The Charter School, Eranakulam

Class : Class 2

gidjodl;.zmnaol,;d,vsjdik.rijziunewejndi,jzzjnxdmerbnebfxzudhsjpojfiujc,xi.kzopfxok,.t,bv

Ans 7:

Iraj Singh from DPS Megacity, Kolkata

Class : Class 9

The correct answer is D.

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B Swaminathan from CHIREC Public School, Kondapur, Hyderabad

Subject :NSO Class : Class 9

Which of the following does not excrete uric acid?

(A) Birds

(B) Mammals

(C) Land snakes

(D) Lizards
Mammals do excrete uric acid! How is this....

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

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Virender Kadian from DPS Hisar, Hansi

Subject :NSO Class : Class 6

In a generator,

Aelectrical energy is converted to mechanical energy
Bmechanical energy is converted to electrical energy
Cchemical energy is converted to electrical energy
Dchemical energy in converted to mechanical energy

It should be mechanical energy to electrical energy

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Ans 1:

Arin Gupta from DELHI PUBLIC SCHOOL, Karnal

Class : Class 6

OPTION B

Ans 2:

ramesh datta from DPS dwarka , New Delhi

Class : Class 7

you are write it should be option b

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Bijayinee Mohapatra from DAV Public School, Sambalpur

Subject :NSO Class : Class 8

Some people might believe that above a certain critical population density, the human population must become vegetarian. Which of the following is more likely to be true?

ATaking into account trophic efficiency it would enable supporting greater number of people.
BEating too much meat is not healthy.
CPlant food contains all nutrients needed for human organism.
DIt would help to increase biodiversity.

Can you please explain?

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Ans 1:

jeeva from Kendriya Vidyalaya Kottayam, Kottayam

Class : Class 5

explain the answer

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Devansh Sachdeva from Blooming Vale Public School, Kotdwara

Subject :NSO Class : Class 5

Certain organisms are able to store energy from the Sun in energy-rich compounds. Which event best illustrates this activity?

AA fox captures and eats a young rabbit.
BA caterpillar is eaten by a blackbird.
CLettuce produces organic substances.
DBacteria change organic material into simple nutrients.

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Ans 1:

Sharad Jain from Presidium, Ghaziabad

Class : Class 5

Lettuce is a green plant conducting photosynthesis. Solar energy is converted to chemical energy in this process and is stored as food.

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Devansh Sachdeva from Blooming Vale Public School, Kotdwara

Subject :NSO Class : Class 5

Rina wanted to make tomato soup. For this, she boiled tomatoes. A mixture of tomato pulp and tomato juice was formed. She wanted to collect only tomato pulp. Which of the following method is best suited to get the desired result?

ACondensation
BWinnowing
CFiltration
DSieving

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Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

i wrote sieving, what do you think?

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Yashi Agrawal from Blue Ridge Public School , Pune

Subject :NSO Class : Class 8

X and Y represent changes at puberty in females and males respectively. Z represents the changes common to both.

Which of the following cannot be represented as Z?

A Appearance of hair in pubic region
B Change in body shape
C Secretion of sex hormones
D None of these

What is the common change then?

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Ans 1:

Mohak Khetan from Podar International School Powai , Mumbai

Class : Class 8

Read the question carefully...it says which of the following CANNOT be Z...all of them can be Z so ans is none of these

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AASHIA CHANDRA from MANAV RACHNA INTERNATIONAL SCHOOL, GURGAON

Subject :NSO Class : Class 7

Out of the given diagrams, which one represents the effect of bringing a positively charged rod near (but not touching) an electroscope?

A 1
B 2
C 3
D 4

I understand it is induction effect and positively charged end of rod shall induce negative charge on the electroscope. Answer should have been (B)

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Ans 1:

Mayank Gupta from Kulachi Hansraj Model School, New Delhi

Class : Class 8

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Daksh from RKC, Rajkot

Subject :NSO Class : Class 3

When ammonia gas is liquefied, there is a change in the _______ of the particles.

A Mass
B Shape
C Size
D Speed

Did not understand this one please explain.

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Ans 1:

from ,

Class :

Class:-- Speed Ammonia gas is one of the liquefied by decreasing temperature and increasing pressure.

Ans 2:

Admin from Revisewise, Noida

Class : Class 3

To liquify ammonia gas the temperature of the gas is reduced. This results into slowing down of the molecules of ammonia. Hence a change in the speed of the particles takes place.

Ans 3:

ARIV GARAI from DPS MEGACITY,KOLKATA, KOLKATA

Class : Class 3

Ans 4:

Arjun Gourineni from CHIREC International School, Hyderabad

Class : Class 7

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