National Science Olympiad Forum By SOF Olympiad Trainer

Supratim Biswas from DPS RUBY PARK KOLKATA, kolkata

Subject :NSO Class : Class 5

Approximate what percentage of the earth is illuminated by the Sun at any given time?

A10%
B25%
C50%
D90%

Ans 1:

SHREYAS ANDOTRA from RYAN INTERNATIONAL SCHOOL, CHANDIGARH

Class : Class 8

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Anhiti Mandal from Shri Ram School, Gurgaon

Subject :NSO Class : Class 6

Manu has three identical roses but of different colours; red, yellow and white. She shines a torch on the three roses in turn and gets a shadow on the wall in each case. Deepak who is observing the shadows formed on the wall can

ADistinguish shadow of red rose only.
BDistinguish shadow of red rose only
CDistinguish shadows of all the three roses.
DNever distinguish the shadows of three roses.

why is it d

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Ans 1:

Arunangshu Karmakar from Salt Lake School (English Medium), Kolkata

Class : Class 6

All the three roses are opaque and will have the same shadow. Regardless of the colour of the rose, the colour of the shadows will always be something darker than the colour of the wall. Thus, no rose could be distinguished from the other by looking at their shadows. So D is the correct answer.

Ans 2:

Soham Panchal from ,

Class : Class 6

This is because the colour of the shadow is always black even if the colour of screen orthe colour of the light is different...

Ans 3:

khushi Joshi from Svkm , Mumbai

Class : Class 8

Since the colour of the shadow doesn't depend on the colour of the object, you cannot distinguish the roses from each other as the colour of the shadow (black) will remain same for all the roses.

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jyothir from National Public School, Yelahankat, Bengaluru

Subject :NSO Class : Class 6

What is the smallest number of squares that must be added so that the line MN becomes a line of symmetry?

(A) 4

(B) 5

(C) 6

(D) 7

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Ans 1:

A from D, V

Class : Class 8

Ans 2:

Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Class : Class 9

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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

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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

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Ans 1:

Vivaan from Thakur public school, Mumbai

Class : Class 5

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

Ans 3:

Meghav Ladani from zydus school for excellence, ahmedabad

Class : Class 6

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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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