National Science Olympiad Forum By SOF Olympiad Trainer

from , Thane

Subject :NSO Class : Class 7

Read the following statements.
(i) I am present in air.
(ii) I leave your lungs when you breathe out.
(iii) Plants needs me to prepare food.
Which of the following gases is being described by the above statements?

ACarbon dioxide
BNitrogen
CHydrogen
DOxygen

how it can be Hydrogen

View All Answers (4)

Ans 1:

Saanvi from rvk, bengaluru

Class : Class 9

it must be carbon dioxide

Ans 2:

VISHNU T M from b, Bengaluru

Class : Class 9

It is not.It is carbon dioxide.(a)

Ans 3:

Pranathi from GIIS, Kuala Lumpur

Class : Class 7

A

Ans 4:

Pisal Dhruv from Veer Bhagat Singh International School, Mumbai

Class : Class 7

it should be carbon dioxide (CO2)

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AARNA Kapse from The swaminarayan school, Nagpur

Subject :NSO Class : Class 2

Rohan was walking on the road. He saw the shadow of tree as shown in the given figure. How would he greet his friends at this time of the day?

AGood evening
BGood morning
CGood afternoon
DGood night

View All Answers (4)

Ans 1:

Anunnakee Banerjee from BBPS NOIDA, NOIDA

Class : Class 7

Ans 2:

Mahi Chandra from ICON School of Excellence, Bengaluru

Class : Class 3

Why not good afternoon. In most of the parts of the world evening is time when sun sets, so practically there won't be any shadow. Also by looking at the picture it looks more around 2-3PM. Good afternoon looks appropriate answer.

Ans 3:

Agnish Chakraborty from The Heritage School, Kolkata

Class : Class 7

It will be A.Good evening.

Ans 4:

Shridatree from GMGS, Kolkata

Class : Class 6

What will be the position of sun for good afternoon then ?

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Shweta Garg from Vibgyor high, Vadodara

Subject :NSO Class : Class 5

Which of the following statements is true regarding weeds?

AWeeds are useful for the plants.
BWeeds are always grown intentionally.
CWeeds should not be removed.
DNone of these

The student is studying soil erosion. The top soil collected is maximum, so it is easily eroded. Answer- A. Top soil is easily eroded.

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Ans 1:

Shweta Garg from Vibgyor high, Vadodara

Class : Class 8

The student is studying soil erosion. The top soil collected is maximum, so it is easily eroded. Answer- A. Top soil is easily eroded.

Ans 2:

SIDDHARTH KUMAR CHATTERJEE from NAVY CHILDREN SCHOOL , CHICALIM

Class : Class 7

LolWrong question.

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Aarush from CA, Bengaluru

Subject :NSO Class : Class 4

Three uniform planks, P, Q and R are balanced on pivots. Two equal forces, each of value F, act on each plank but in different manners as shown in the figure.Which of the following options is correct regarding this?

APlank P will either bend or break.
BPlank Q will show no movement at all.
CPlank R will be pulled up the pivot.
DPlank P will show no movement at all.

if equal is being applied on Q....on the left lower and right upper end.... wont it balance out and not make Q move? How is option B correct?

View All Answers (3)

Ans 1:

Nishtha Shukla from Sri Chaitanya Techno School, Gurgaon

Class : Class 8

B

Ans 2:

Dakala Murari from Indian school of excellence, Bangalore

Class : Class 4

answer is d

Ans 3:

AHANA BAG from DELHI PUBLIC SCHOOL JOKA SOUTH KOLKATA, KOLKATA

Class : Class 9

The correct answer is D

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Kushagra Kishore from Chrysalis High, Bengaluru

Subject :NSO Class : Class 6

Read the statements regarding the given food web and select the option that consists of all correct statements.

(i) There are 7 interconnected food chains in the given food web.
(ii) Snake and fox serve as top consumers in the given food web.
(iii) Snake serves as primary, secondary as well as tertiary consumer in the given food web.
(iv) If populations of rat and rabbit are removed from this community then populations of snake and fox will be equally affected negatively.
(v) There are four primary consumers and two secondary consumers in the given food web.
(vi) If the populations of top consumers are removed from this food web then populations of all primary consumers of web will decline.

A(iv) and (v) only
B(i), (iii) and (v) only
C(i) and (ii) only
D(ii), (iv) and (vi) only

The answer should be - d

View All Answers (6)

Ans 1:

Advait bhat from Kendriya Vidyalaya , Bangalore

Class : Class 9

Ans 2:

Sreeram G K from DPS Faridabad, Faridabad

Class : Class 7

Ans 3:

Advait bhat from Kendriya Vidyalaya , Bangalore

Class : Class 9

i am the god of explanation the two primary consumers are sreeram dps and kanveent kaur

Ans 4:

Shubhangi Pathak from Lilavatibai Podar High School, Mumbai

Class : Class 8

Ans 5:

Kavneet Kaur from Sat Paul Mittal School, Ludhiana

Class : Class 8

Explanation please.

Ans 6:

Ayan Vohra from Bhavan Vidyalaya , Chandigarh, chandigarh

Class : Class 8

YOU AS WELL ADVAIT HAHAHAHAHAHAHAHA

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ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur

Subject :NSO Class : Class 4

Count the number of squares formed in the given figure.

A12
B20
C22
D24

View All Answers (3)

Ans 1:

Daksh Jain from National public school Indiranagar , Bengaluru

Class : Class 8

a

Ans 2:

ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur

Class : Class 9

A

Ans 3:

Ryan from YBIS , SINGAPORE

Class : Class 5

A

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ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur

Subject :NSO Class : Class 4

What number is missing in the pattern given below ?
16, 24, 32, 40, _?_

A46
B48
C56
D64

B

View All Answers (6)

Ans 1:

Samarth Vijay Yeliathaya from Shri Kumarans Children home,cbse, Bangalore

Class : Class 5

b aka 48

Ans 2:

Audhira from vydehi school of excellence, bangalore

Class : Class 7

adition of 8 simple plause

Ans 3:

Samarth Vijay Yeliathaya from Shri Kumarans Children home,cbse, Bangalore

Class : Class 5

Ans 4:

Samarth Vijay Yeliathaya from Shri Kumarans Children home,cbse, Bangalore

Class : Class 5

Ans 5:

Audhira from vydehi school of excellence, bangalore

Class : Class 7

Ans 6:

Risha Jakhotiya from Sanskriti School , Pune

Class : Class 3

The next number is got by adding 8 .16 8 = 24, 24 8 = 32 and 32 8 = 40. So, 40 8 = 48Answer-B. 48

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ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur

Subject :NSO Class : Class 4

Which of the following statements is/are INCORRECT regarding the given figures, X and Y?
1. X depends partly on animals for food but can also make its own food while Y cannot make its own food.
2. X has chlorophyll while Y does not contain chlorophyll and is non-green.
3. In X, food is prepared by the green stem, whereas Y obtains its food from dead and decaying plants and animals.
4. X and Y have patches of green colour. Only green part of their leaves performs photosynthesis.

A1, 3 and 4
B2 and 3
C1 and 4
D3 and 4

C

View All Answers (5)

Ans 1:

Ronav Kerkar from Jamnabai Narsee School, Mumbai

Class : Class 7

Ans 2:

Nishtha Shukla from Sri Chaitanya Techno School, Gurgaon

Class : Class 8

B

Ans 3:

Aayush Reddy Bomidika from Delhi Public School Nacharam, Hyderabad

Class : Class 9

B

Ans 4:

Ronav Kerkar from Jamnabai Narsee School, Mumbai

Class : Class 7

A

Ans 5:

ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur

Class : Class 9

C

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Anannya pravin Joshi from LOkPURAM PUBLIC SCHOOL , THANE

Subject :NSO Class : Class 6

Total number of bones in a new born baby is around ____.

A206
B209
C250
D300

if I search this answer on google then the ans is 206 bones and then the ans which they are giving is different pls help me out

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Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

You might've searched for the number of bones in a human body, which means in an adult... 206 is the no. of bones in an adult but in a newborn baby, there are about 300 bones which join together slowly when we grow up....

Ans 2:

ABHIROOP SAHU from BHAVANS GANGABOUX KONORIA VIDYAMANDIR, KOLKATA

Class : Class 4

Ans 3:

Pranav Raj from B.V.M. Global, Chennai

Class : Class 6

Thanks for your answer

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Ananya D from Sacred Heart School, Thane

Subject :NSO Class : Class 2

Unscramble the given words and select the option which is NOT a plant source.

A D E R A B
B T E B U T R
C M D L O A N
D G A R U S

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Ans 1:

Akshat saggar from Apeejay, Noida

Class : Class 2

A is the answer.its bread

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