National Science Olympiad Forum By SOF Olympiad Trainer - Page 371

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Aditya Ananda Bharali from Chirec International School,Kondapur , Hyderabad

Subject :NSO Class : Class 2

I am not able to access Aditya’s result for NSO exam

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Gauri Singh from St Johns School Marhauli, Varanasi

Subject :NSO Class : Class 7

Refer to the given Venn diagram and select the correct statements regarding animals X, Y and Z.

(i) Y can close its nostrils and remain underwater for long duration.
(ii) X possess glands under the eyes that help the body to get rid of excess salt.
(iii) Blubber is present under the skin of X and Z which protects them from cold.
(iv) X and Y are adapted to live in extremely cold climate of polar regions.
(v) Y live in groups and huddle together to keep themselves warm.
(vi) Z camouflage with the surrounding to avoid predators.

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

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Ans 1:

Kupa sulakhi from Nes international, Thane

Class : Class 7

Ans 2:

Midhuna from ABCD, Banglore

Class : Class 3

Ans 3:

Arhan Shri Gupta from Mayoor Private School, Abu dhabi

Class : Class 7

Ans 4:

Prathamesh Raje from DPS Electronic City, Bangalore

Class : Class 9

Ans 5:

Akshara from NPS, Bengaluru

Class : Class 8

Ans 6:

Himanish Basu from Army Public School Kamaraj Road, Bangalore

Class : Class 7

Ans 7:

Ankush Ghosh from DPS, Doha

Class : Class 10

Ans 8:

aritroray from Chirec International School, Hyderabad

Class : Class 8

Ans 9:

I Riona Angel from Pincushion Montessori International School, Vellore

Class : Class 7

Ans 10:

from Podar International School,Dhule, Dhule

Class : Class 8

Ans 11:

Vartika Agarwal from Phoenix world school, Pune

Class : Class 9

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Dhruv Sachdev from Bhavan Vidyalaya, chandigarh

Subject :NSO Class : Class 3

Study the given Venn diagram.
Identify P-S and select the INCORRECT statement.

AQ could possess hair whereas R could possess feathers.
BP could possess beaks whereas S could possess spiracles.
CBoth R and S may possess six legs.
DBoth P and R could possess feathers.

in C insects breathe through spiracles.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

S could be insects, so they can possess six legs. R can be birds, they possess only two legs. So, this statement is incorrect.

Ans 2:

Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon

Class : Class 7

Ans 3:

Alina Chattopadhyay from Tagore International School, Vasant Vihar, New Delhi, South Delhi

Class : Class 6

i got it wrong

Ans 4:

YAJAT KUMAR from RPS PUBLIC SCHOOL , Narnaul

Class : Class 3

I have given wrong answer

Ans 5:

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

Class : Class 8

Ans 6:

Meghatyoya from Adamas World School , Barasat

Class : Class 3

option c is the correct option because R is a bird

Ans 7:

Abir Jha from CNS, Mumbai

Class : Class 4

C cannot be the answer as R can't be insects as insects breathe through spiracles and not lungs.

Ans 8:

Krisha malik from Sacred heart convent school, Ludhiana

Class : Class 3

Thanks for telling

Ans 9:

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

Class : Class 8

ccccc

Ans 10:

Mohit Gupta from Sat Paul mittal school, Ludhiana

Class : Class 3

B should be answer

Ans 11:

Lyra Roy from The Samhita Academy, Bangalore

Class : Class 4

C is the answer.

Ans 12:

Aadyah Dixit from Greenwood High International School, Bangalore

Class : Class 4

R can be any mammal and S can be insects, as mammals have 4-2 legs answer C is wrong and answer B is correct. But my computor is showing that C is correct. HOW!?!!?

Ans 13:

Yatindra G from SBOA, Chennai

Class : Class 4

HOW??I don't understand!!!!!!!!

Ans 14:

Poorani from ,

Class : Class 1

pls explain the answer

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Tanmay Mehta from Nirmala Convent high school, Renukoot

Subject :NSO Class : Class 9

Observe the given flow chart and answer the following questions. What are c and d?

A c = multiply by N_A, d = divide by N_A
B c = multiply by N_A, d = multiply by N_A
C c = divide by N_A, d = multiply by N_A
D c = divide by N_A, d = divide by N_A

good question

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KARTHI BALAJI from SBOA SCHOOL AND JUNIOR COLLEGE, CHENNAI

Subject :NSO Class : Class 8

The graph given below shows how the temperature of water changes with time.
Hot water was added at certain points during the experiment.

At which points in the graph was hot water added?

Aa and c only
Bb and d only
Ca, c and e only
Db, d and f only

v.useful

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Ans 1:

Ram K from Sanskriti, Hyderabad

Class : Class 2

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Dushyant Singh from Shri Ram Centennial School, Indore

Subject :NSO Class : Class 5

What is the sum of the 4 numbers in SQUARE 10?

A 160
B 154
C 138
D 182

Very easy.

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Ans 1:

Shivesh Senthilkumar from vels vidyashram, chennai

Class : Class 6

Ans 2:

Shivesh Senthilkumar from vels vidyashram, chennai

Class : Class 6

Ans 3:

Gaithri shree Madhan from Dawn School, Chennai

Class : Class 6

Ans 4:

UMANG from SPRING DALE COLLAGE, Lucknow

Class : Class 8

ANS IS 154

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Harsh Gupta from AECS Narora, Narora

Subject :NSO Class : Class 9

Different substances are classified as :
I. Pure substance
II. Homogeneous mixture
III. Heterogeneous mixture
A few common substances are listed below.
(i) Air, (ii) Graphite, (iii) Gasoline, (iv) Diamond, (v) Tap water, (vi) Iron, (vii) Sodium chloride, (viii) Iodised salt, (ix) Brass, (x) Oil and water

Which of the following represents the correct classification of the given substances?
A I - (ii), (vi), (ix); II - (i), (v), (vii); III - (iii), (iv), (viii), (x)
B I - (ii), (iv), (vi), (vii); II - (i), (iii), (v), (viii), (ix); III - (x)
C I - (i), (iv), (vii), (ix); II - (ii), (v), (viii); III - (iii), (vi), (x)
D None of these represents the correct match.

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Ans 1:

Tanmay Mehta from Nirmala Convent high school, Renukoot

Class : Class 9

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Rhyin Mandal from Hem Sheela Model School, DURGAPUR

Subject :NSO Class : Class 8

An unknown metal X when placed in copper sulphate solution, red brown pieces of copper fall to the bottom of the test tube. When metal X is placed in aluminium sulphate solution, no change is observed. Metal X can be

A Sodium
B Potassium
C Iron
D Calcium.

it will be calcium as ,iron is below aluminium in the reactivity series and the metal 'X' is more reactive than Al. as K

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Ans 1:

Nikita Nair from DPS Noida, Ghaziabad

Class : Class 9

Ans 2:

Prabhnoor from Delhi Public School, Chandigarh

Class : Class 9

according to reactivity series K>Na>Ca>Mg>Al>Zn>Fe>Pb>H>Cu>Hg>Ag>Au>Pt the metal should be between Al and Cu and hence Fe is the answer

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RICHA BORAH from K V ANNA NAGAR, CHENNAI

Subject :NSO Class : Class 6

Match the column I with column II and select the correct option from the codes given below :

A P - (ii), Q - (iv), R - (iii), S - (i)
B P - (i), Q - (iii), R - (ii), S - (iv)
C P - (iii), Q - (iv), R - (i), S - (ii)
D P - (iii), Q - (iv), R - (ii), S - (i)

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Ans 1:

Anamkhan Mulla from Navrachna Sama, Vadodara

Class : Class 7

Ans 2:

Anamkhan Mulla from Navrachna Sama, Vadodara

Class : Class 7

Ans 3:

Rohan TR from Sri Aurobindo memorial school, Bangalore

Class : Class 6

Ans 4:

UMA Subramanian from Global Indian International School, Singapore

Class : Class 7

Ans 5:

Vatsal Gupta from Mondrian House, DEHRADUN

Class : Class 6

Ans 6:

ADVAY BANSAL from LOTUS VALLEY INTERNATIONAL SCHOOL GURUGRAM, GURUGRAM

Class : Class 6

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RICHA BORAH from K V ANNA NAGAR, CHENNAI

Subject :NSO Class : Class 6

Read the given statements and select the correct option.
Statement 1 : After harvesting, the stems of the jute plants are tied into bundles and retted (soaked) in water for about 20 days.
Statement 2 : The process of retting softens the tissues and helps to separate the fibres.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.

The process of retting, rottens or softens the stem tissues of jute plant so it is easier to separate the fibres from the stem.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

Jute is a fibre obtained from stem of jute plant. Jute is harvested during flowering stage. The stems are cut off close to the ground and are left to dry for sometime. Dried stems are then tied into bundles and soaked in water for about 20 days. This process is called retting. It softens the tissue and permits the fibres to be separated.

Ans 2:

Aadhira from velammal new gen school, Medavakkam, Chennai

Class : Class 6

The correct answer is (A).

Ans 3:

Satvik Pattanaik from GreenwoodHigh, bangalore

Class : Class 6

Ans 4:

Aadvik saini from Mvn sector 17, Faridabad

Class : Class 8

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