National Science Olympiad Forum By SOF Olympiad Trainer

Iba Khan from DPS , Noida

Subject :NSO Class : Class 8

Select the correct statements.
(i) Magnesium ribbon on heating in air catches fire and burns with white flame to form magnesium oxide.
(ii) All metals react with water to evolve hydrogen gas.
(iii) Iron reacts with cold water slowly.
(iv) Sodium metal is always kept in kerosene as it reacts vigorously with air and moisture.

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

why is option C not the right answer?

View All Answers (8)

Ans 1:

vishant mishra cool guy from Deens Academy, Bengaluru

Class : Class 2

Ans 2:

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

Class : Class 9

why have they missed the letters 'i' and 'n' in the question?or maybe they have marked the wrong answer as the correct onenot agreedSOF PLEASE TAKE NOTE AND CORRECT THE ERROR

Ans 3:

ALICE from Delhi Public School, UDAIPUR

Class : Class 9

Ans 4:

ALICE from Delhi Public School, UDAIPUR

Class : Class 9

Ans 5:

NIVED PRAKASH NAIR from SARVODAYA, THIRUVANANTHAPURAM

Class : Class 8

Ans 6:

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

Class : Class 8

Actually, the question should be,"Select the incorrect statements.". Or they must have marked the wrong answer according to the question. SOF, kindly rectify this error.

Ans 7:

NIVED PRAKASH NAIR from SARVODAYA, THIRUVANANTHAPURAM

Class : Class 8

Ans 8:

Advay Das from Delhi Public School, Gurgaon

Class : Class 5

It should be c not b or the question should have written incorrectly

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ishruthika gopi from VIDHYALAKSHMI CBSE senior secondary School, Vellore

Subject :NSO Class : Class 6

Reena took some moong seeds and soaked them overnight in water. Next day, after draining out the water, she wrapped the seeds in a wet cloth. After one day, she observed small white structures growing out of the seeds. These small white structures will develop into

A Stems
B Leaves
C Roots
D Flowers.

Its wrong

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Ans 1:

ishruthika gopi from VIDHYALAKSHMI CBSE senior secondary School, Vellore

Class : Class 6

My answer is option c

Ans 2:

Shreyasi Padihary from The Cambridge International School , Bangalore

Class : Class 7

The answer is Option C

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AARNA GOEL from UPTON SCHOOL, ENGLAND

Subject :NSO Class : Class 5

Take a glass and fill it with water up to the brim. Make sure that there are no air bubbles. Take a thick, stiff piece of cardboard and put it over the glass. Place your hand over the card and quickly turn the glass upside down. Now slowly remove your hand.

What does this experiment show?

A Air occupies space.
B Air exerts pressure.
C Air has weight.
D All of these

View All Answers (1)

Ans 1:

Tanvi from hh, delhi

Class : Class 5

I know, it's B!

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from ,

Subject :NSO Class : Class 6

The diagram below, shows part of the water cycle.

What is process 'T' called?

A Melting
B Condensation
C Evaporation
D Precipitation

How

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Ans 1:

maheem from fatima convent primary school , bhavnagar

Class : Class 6

Ans 2:

Spandan Yogesh Patil from SNBP Chikkali,Pune, Pune

Class : Class 6

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Nikita Rangarajan from PSBB, Chennai

Subject :NSO Class : Class 7

Sumedha took a spoon of turmeric powder and made a paste by adding little water to it. She cut thin strips of a paper and applied this paste on them. After drying she put few drops of given sample solutions (i)-(iv) on these strips. What would be the changes in the colour she observed?

(i) Amla juice
(ii) Lime water
(iii) Common salt solution
(iv) Baking soda solution

	(i)	(ii)	(iii)	(iv)
A	Yellow	Red	Yellow	Red
B	Red	Yellow	Yellow	Red
C	Red	Red	Yellow	Yellow
D	Yellow	Yellow	Red	Red

Amla juice is acidicIt is A

View All Answers (2)

Ans 1:

Nikita Rangarajan from PSBB, Chennai

Class : Class 7

Ans 2:

Nikita Rangarajan from PSBB, Chennai

Class : Class 7

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Kimaya from mlzs, Bangalore

Subject :NSO Class : Class 6

The given figure shows a dissected flower viewed with a magnifying glass.

The number of ovules and anther respectively present in the given figure are

A1, 4
B5, 6
C6, 6
D6, 5

D

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Ans 1:

Kimaya from mlzs, Bangalore

Class : Class 3

Ans 2:

RS LEGEND from City Montessori School, Lucknow

Class : Class 7

3 is the correct answer

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AUSTIN from Viswajyothi CMI Public School, Chowara

Subject :NSO Class : Class 1

The given picture shows Raman in park. Select the correct option regarding it.

ARaman will have muscle weakness due to excess of this activity.
BRaman will have low stamina because of this activity.
CRaman should do this activity only once a month.
DNone of these

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Nithya Soman from The Charter School, Eranakulam

Subject :NSO Class : Class 4

A mirror and a glass are placed between a light source and a screen as shown in the given figure.

Which of the following shadows will be formed on the screen?

A
B
C
DNo shadow will be formed

View All Answers (5)

Ans 1:

Spruha from AVM, mumbai

Class : Class 5

Ans 2:

Aarya Ranjan from Chrysalis High Varthur, bangalore

Class : Class 4

Ans 3:

Aarya Ranjan from Chrysalis High Varthur, bangalore

Class : Class 4

Ans 4:

Aarya Ranjan from Chrysalis High Varthur, bangalore

Class : Class 4

Ans 5:

Aarya Ranjan from Chrysalis High Varthur, bangalore

Class : Class 4

dont understand why it is c

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Nithya Soman from The Charter School, Eranakulam

Subject :NSO Class : Class 4

Which of the following statements is INCORRECT?

ADown feathers of birds keep them warm
BWading birds have long legs with spread-out toes that help them to walk in water
CPerching birds have two toes in the front and two toes at the back
DFlesh-eating birds such as eagle, vulture and hawk have strong, sharp and hooked beaks

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Ans 1:

Arnav Loganathan from Suguna PIPS , Coimbatore

Class : Class 4

Ans 2:

Malhaar from Inventure Academy, Bangalore

Class : Class 4

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AArav priyadarshi from Delhi Public School, Vindhyanagar

Subject :NSO Class : Class 6

An animal 'X' is found in areas covered with ice and snow. It has thick layer of fat beneath the skin. It lives in groups to protect itself from cold.
Unscramble the given words and identify the animal 'X'.

A IONPRSOC
B ESHROESA
C TPOSCOU
D GUNEPNI

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