National Science Olympiad Forum By SOF Olympiad Trainer

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:

Chaitanya L K from SKCHEC, bangalore

Class : Class 8

ans is b

Ans 2:

Chaitanya L K from SKCHEC, bangalore

Class : Class 8

B is the answer

Ans 3:

Debarka Das Gupta from Silchar Don Bosco School, Silchar

Class : Class 7

B is the answerðð

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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:

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

Class : Class 10

D

Ans 2:

EKLAVYA GONDULE from DPS BHILAI, Bhilai

Class : Class 7

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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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Prashant mishra from Kv Malleshwaram, Bengaluru

Subject :NSO Class : Class 7

Which of the following statements are incorrect?
(i) Cellular respiration is a physical process in which food molecules are broken down into carbon dioxide and water.
(ii) Anaerobic respiration involves breakdown of glucose into alcohol and carbon dioxide.
(iii) Breathing rate varies according to oxygen requirement of the body.
(iv) On land, frogs breathe through lungs and in water by gills.
(v) Respiration in plants occurs through stomata and lenticels.

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

i doubt on it . how could cellular respiration could be a physical one.

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Ans 1:

kartick Somasundaram from san academy, chennai

Class : Class 1

illa nila. No

Ans 2:

Derek from Arsha vidya Mandir, Chennai

Class : Class 7

The answer is a this is because we know that cellular respiration is a chemical process as it involves oxidation of food so that statement is wrong. Next statement 2 is also wrong because when anaerobic respiration takes place glucose is broken down into ethyl alcohol carbon dioxide or lactic acid the statement is incomplete hence wrong then statement 4 is wrong because frogs do not have gills.

Ans 3:

Aryam Singh from Palladium School , Hisar

Class : Class 7

answer should be B

Ans 4:

Nila Pillai from Chennai public School, Chennai

Class : Class 6

right?

Ans 5:

Nila Pillai from Chennai public School, Chennai

Class : Class 6

The answer should be d...

Ans 6:

Nila Pillai from Chennai public School, Chennai

Class : Class 6

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Prashant mishra from Kv Malleshwaram, Bengaluru

Subject :NSO Class : Class 7

In the given figure who among the following is the primary consumer?

ASnake
BLion
CRabbit
DFrog

i want to know how the rabbit is the primary consumer. Thank you

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