National Science Olympiad Forum By SOF Olympiad Trainer

Riddhima Pandey from Chinmaya Vidyalaya, Bokaro Steel City

Subject :NSO Class : Class 3

Refer to the given word grid and answer the following questions.

How many of these fibres are obtained from animals?

A Two
B Five
C Six
D One

Thanks for the answer

Ans 1:

ANSHUL GAJJAR from PODAR INTERNATIONAL SCHOOL, AHMEDABAD

Class : Class 3

A

Ans 2:

Iraj Singh from DPS Megacity, Kolkata

Class : Class 9

Wool and Silk only we can find is obtained from animals.

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Jayanth from The Deens Academy, Bengaluru

Subject :NSO Class : Class 4

The given diagram shows three different ways that a sugar cube can undergo a physical change. Which characteristic of the sugar cube does not change?

(A) Shape

(B) State

(C) Weight

(D) Texture

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Jayanth from The Deens Academy, Bengaluru

Subject :NSO Class : Class 4

How many minimum squares must be shaded to make the figure symmetric along the given line of symmetry ?

(A) 2

(B) 3

(C) 4

(D) 1

Ans 1:

aayushi anand from AIR FORCE SCHOOL HASIMARA, HASIMARA

Class : Class 4

A

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Chaitanya L K from SKCHEC, bangalore

Subject :NSO Class : Class 7

Rahul gets an assignment to make a list of fabrics made of different fibres. He takes pieces of fabric X and Y and burns them to identify the fibre. Fibre X burns with smell of charred meat and fibre Y burns with smell of burning hair. Identify the fabrics X and Y.

A
B
C
D

ans is B

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Ans 1:

Debarka Das Gupta from Silchar Don Bosco School, Silchar

Class : Class 7

B is the answerðð

Ans 2:

Chaitanya L K from SKCHEC, bangalore

Class : Class 8

ans is b

Ans 3:

Chaitanya L K from SKCHEC, bangalore

Class : Class 8

B is the answer

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Rachel from Mount litera Zee School Goa, Goa

Subject :NSO Class : Class 3

Digit at the tens place in the number that comes as a difference between 5 hundreds 6 tens 13 ones and 7 hundreds 2 tens 15 ones is _________.

(A) 7

(B) 6

(C) 5

(D) 4
can anyone explain this solution

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Ans 1:

ANSHUL GAJJAR from PODAR INTERNATIONAL SCHOOL, AHMEDABAD

Class : Class 3

B.500+60+13=573 AND 700+20+15=735DIFFERANCE BETWEEN 573 AND 735 =162 ANS 6 TENS PLACE IN 162

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sathvik from nsm public school, vijaywada

Subject :NSO Class : Class 9

Two satellites S₁ and S₂ revolve around a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1 h and 8 h respectively. The radius of the orbit of S₁ is 10⁴ km. When S₂ is closest to S₁, then the speed of S₂ relative to S₁ will be

Aπ × 10⁴ km h^-1
B2π × 10⁴ km h^-1
C1 × 10⁴ km h^-1
D2 × 10⁴ km h^-1

could anyone give me a detailed solution for this?

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Ans 1:

Tanishq Mittal from Shaheed rajpal Dav school, Delhi

Class : Class 9

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Adish Gupta from Podar international school , Mumbai

Subject :NSO Class : Class 7

Choose the correct graph representing different values of resistances for wires made from different materials.

A
B
C
D

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Ans 1:

EKLAVYA GONDULE from DPS BHILAI, Bhilai

Class : Class 7

Ans 2:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM

Class : Class 10

D

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

(i)---------(ii)-------(iii)
ATrue------False-----True

BFalse-----True------False

CFalse-----True------True

DTrue------True------False

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Ans 1:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Class : Class 10

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akshaj das from NARAYANA E TECHNO kaggdaspura, Bengaluru

Subject :NSO Class : Class 5

A fixed volume of water will dissolve a certain amount of salt. If the same volume of water is then heated, more salt can be made to dissolve in it. The best explanation to this is________.

AHeating increases the spaces between the water molecules
BHeating reduces the size of the salt particles
CSalt melts in hot water
DBoth water and salt particles become smaller when heated

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Ans 1:

MEDHA LAKSHIMI from THE UNIVERSAL SCHOOL , MUMBAI

Class : Class 6

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

During the process of inhalation in human beings _________.

(A) Diaphragm contracts but external intercoastal muscles and lungs expand.

(B) Diaphragm expands but external intercoastal muscles and lungs contract.

(C) Diaphragm and external intercoastal muscles expand but lungs contract.

(D) Diaphragm and external intercoastal muscles contract but lungs expand.

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