National Science Olympiad Forum By SOF Olympiad Trainer

HARSHIKAA DHAR from Delhi Public School, Noida

Subject :NSO Class : Class 4

Find the perimeter of the given figure (not drawn to scale).

(A) 68 cm

(B) 65 cm

(C) 57 cm

(D) 71 cm

Ans 1:

OISHIK KUNDU from Delhi Public school North kolkata, baranagar

Class : Class 4

same as me

Ans 2:

Jayanth from The Deens Academy, Bengaluru

Class : Class 4

Ans 3:

Priyam Bhattacharya from cambridge court high school, jaipur

Class : Class 6

Ans 4:

ABHAY AGARWAL from ,

Class : Class 3

This is terrible

Ans 5:

S Nithyanth from Geethanjali Vidyalaya, Bangalore

Class : Class 6

same

Ans 6:

S Nithyanth from Geethanjali Vidyalaya, Bangalore

Class : Class 6

Ans 7:

ABHAY AGARWAL from ,

Class : Class 3

Ans is sixty five (B)

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Adivishnu SP from Delhi Public School Nadergul, Hyderabad

Subject :NSO Class : Class 4

In the given food web, how many animals are
a. only plant eaters?
b. only animal-eaters?

            a            b
A 3            4
B 2            2
C 1            5
D 4            3

explain it please

Ans 1:

Sarthak Gupta from DPS, Haryana

Class : Class 4

Ans 2:

TANVI D MARGHADE from PODAR INTERNATIONAL SCHOOL POWAI, MUMBAI

Class : Class 6

Ans 3:

RAGHAV VARSHNEY from CITY MONTESSORI SCHOOL GOMTINAGAR LUCKNOW, Lucknow

Class : Class 7

Ans 4:

Punyatoya from Harvest, Bengaluru

Class : Class 8

True

Ans 5:

Punyatoya from Harvest, Bengaluru

Class : Class 8

Ans 6:

Lakshya Singh Tomar from DPS Noida, Noida

Class : Class 4

please SOF don`t be mad

Ans 7:

Aahana Agarwal from NPS Koramangala, Bengaluru

Class : Class 6

They haven't said that the only animal eaters .

Ans 8:

BV Karthikeya from Sentia, Hyderabad

Class : Class 6

Ans 9:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Class : Class 8

They haven't specified that it should be ONLY animal eater.

Ans 10:

Punyatoya from Harvest, Bengaluru

Class : Class 8

True

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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:

Archit Das from NPS, Singapore

Class : Class 6

Ans 2:

Meghav Ladani from zydus school for excellence, ahmedabad

Class : Class 8

Ans 3: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

Ans 4:

Nithya Soman from The Charter School, Eranakulam

Class : Class 7

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

Ans 5:

Vivaan from Rustomjee Cambridge International School and Junior College, Mumbai

Class : Class 6

Ans 6:

Iraj Singh from DPS Megacity, Kolkata

Class : Class 9

The correct answer is D.

Ans 7:

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

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Nirali Rashesh Desai from ,

Subject :NSO Class : Class 4

People living in different states of India, wear different types of clothes, depending on the climate and tradition of the state. Which amongst the following represents the state of India which does not have any coastal areas?

A
B
C
D

View All Answers (4)

Ans 1:

Aarush from Podar, Mumbai

Class : Class 10

b

Ans 2:

ABHAY AGARWAL from ,

Class : Class 3

answer shd be k

Ans 3:

PRANSHU AGRAWAL from The Jain International School, Bilaspur

Class : Class 6

The answer is Bbecause A is a Maharashtrian , C is gujurati , D is bengali and B is punjabi which does not live near coastal areas

Ans 4:

AARUSH from DPS, Mumbai

Class : Class 4

Yes it is B

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Spandan Mohanty from Psbb Millennium , Chennai

Subject :NSO Class : Class 4

Two organisms Y and Z depend on plants for their food requirement. Organism Y eats plants directly while organism Z depends on plants indirectly. If all the plants in this area are wiped out, then

A organism Y will be the most affected
B organism Z will be the most affected
C organism Y will not be affected at all
Dorganism Z will not be affected at all

this question came wrong to me after i gave the science level-2 mock test. please help me with its explantion

View All Answers (2)

Ans 1:

Admin from Revisewise, Noida

Class : Class 3

If all plants in the area are wiped out the Organism Y will be affected most as it is directly dependent on the plants for its food requirement.

Ans 2:

AARUSH from DPS, Mumbai

Class : Class 4

A

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Aarush Semwal from DPS Noida, Noida

Subject :NSO Class : Class 4

Rajeev put a leaf he had just plucked, into a beaker of warm water as shown. He noticed bubbles coming out of the leaf. He noticed more bubbles on the lower surface of leaf. Which of the following is the correct explanation for this?

A Photosynthesis can take place on the lower surface of the leaf.
B There are more stomata on the lower surface of the leaf.
C The leaf is transporting sugar to the lower surface of the leaf.
D Carbon dioxide enters the leaf from the upper surface and oxygen comes out from the lower surface.

I know the answer.......YOU TELL

View All Answers (5)

Ans 1:

SAMRIDDHI from Chirec International School, Hyderabad

Class : Class 4

check solution

Ans 2:

Shreyas from VPEMS, Baramati

Class : Class 4

D should both correct

Ans 3:

SIDDHARTH KUMAR CHATTERJEE from NAVY CHILDREN SCHOOL , CHICALIM

Class : Class 7

D is correct.

Ans 4:

Shreyas from VPEMS, Baramati

Class : Class 4

Ans 5:

SAMRIDDHI from Chirec International School, Hyderabad

Class : Class 4

no b is correct

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Apoorva from Blue Ridge Public School, Pune

Subject :NSO Class : Class 4

Mayank wants to separate a mixture of salt-water-san. Which of these separation methods should he use to separate all the three components?

AFiltration, Distillation
BFiltration, Evaporation
CFlotation, Sedimentation
DEvaporation, Decantation

View All Answers (8)

Ans 1:

ishaan from BJM carmel Academy, Chandrapur

Class : Class 7

why not decantaion and evaporation.

Ans 2:

Nishtha maheshwari from Inventure Academy, Bengaluru

Class : Class 3

Ans 3:

VANSH GARG from DPSG, GHAZIABAD

Class : Class 4

why not decantaion and evaporation.

Ans 4:

Saarth Agrawal from Podar International School , Mumbai

Class : Class 6

Ans 5:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Class : Class 8

Evaporation can also differentiate salt and water after removing sand by filtration right? Evaporation will differentiate as salt will stay back and water will evaporate.

Ans 6:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Class : Class 8

SOF SOF and master answerPlease give me the answer

Ans 7:

Ivan Tyagi from Chirec International School , Hyderabad

Class : Class 8

b

Ans 8: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is A.

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riteshnayak from DAV PUBLIC SCHOOL ,MCL,KALINGA AREA, TALCHER

Subject :NSO Class : Class 4

Which of these is INCORRECT about roughage?

A It helps in making blood.
B It helps in repairing the damaged parts of the body.
C It helps the body to get rid of undigested food.
D Both a and b

WHAT IS THE ANSWER

View All Answers (2)

Ans 1:

SOUMI PAL from DELHI PUBLIC SCHOOL, DURG

Class : Class 6

The right answer is d.

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

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sai ramakrishna GUDIMETLA from AMM MATRICULATION HIGHER SECONDARY SCHOOL, Chennai

Subject :NSO Class : Class 4

The diagram below shows a portion of the solar system as seen from space.For which object is the lighted surface shown incorrectly?

AMoon
BVenus
CMercury
DEarth

View All Answers (4)

Ans 1:

Supreet Birdi from Global Indian International School, Bangalore

Class : Class 9

Venus is incorrect as the shaded part means that it is night. Here the shaded part is facing the sun.

Ans 2:

Harshkant Gharote from Delhi Public School kolar road , Bhopal

Class : Class 7

B. It is Venus

Ans 3:

OISHIK KUNDU from Delhi Public school North kolkata, baranagar

Class : Class 4

so the ans is B

Ans 4:

Parth from St Stephens School, Chandigarh

Class : Class 5

option B

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sai ramakrishna GUDIMETLA from AMM MATRICULATION HIGHER SECONDARY SCHOOL, Chennai

Subject :NSO Class : Class 4

Which of the following conditions does not increase the rate of evaporation?

AIncrease in wind speed
BDecrease in humidity
CIncrease in temperature
DDecrease in surface area

View All Answers (7)

Ans 1:

Neil from SNBP international school, Pune

Class : Class 4

Ans 2:

Pratham Jain from Clara Global School, Pune

Class : Class 4

Decrease in surface area =more water than land and increase in wind speed=less humidity and less evaporation so option A is correct

Ans 3:

Parth from St Stephens School, Chandigarh

Class : Class 5

option D

Ans 4:

Satvik Bhand from DPS Bhopal, Bhopal

Class : Class 2

Ans 5:

Parth from St Stephens School, Chandigarh

Class : Class 5

option D

Ans 6:

Harshkant Gharote from Delhi Public School kolar road , Bhopal

Class : Class 7

D. Decrease in surface area

Ans 7:

Anirudh from indira, Pune

Class : Class 5

D

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