National Science Olympiad Forum By SOF Olympiad Trainer

Darshil Rath from Sai International School , Bhubaneswar

Subject :NSO Class : Class 3

Match column-I with column-II and select the correct option from the given codes.

Colunm-I (Bird)	Column-II (Nesting material)
a- Tailor bird	(i) Grass and twings
b- Weaver bird	(ii) Wood
c- Penguin	(iii) Leaves, cotton and dry grass
d- Woodpecker	(iv) Pebbles and stones

Aa-(iii), b-(i), c-(iv), d-(ii)
Ba-(i), b-(iii), c-(iv), d-(ii)
Ca-(iii), b-(i), c-(ii), d-(iv)
Da-(i), b-(iii), c-(ii), d-(iv)

Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

A

Ans 2:

T S from OWIS, Bangalore

Class : Class 4

Ans 3:

Dyuti Ghosh from Mount Litera Zee School , JAJPUR ROAD

Class : Class 3

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Srihari g from silveroaks, hyderabad

Subject :NSO Class : Class 10

Shaheen, a class 10 student studied the speed of the given reaction under different conditions.

In experiment I, she added 1 g of MnO₂ (catalyst) to 75 cm³ of 0.4 mol/L H₂O₂ solution at 30°C In experiment II, she added 1 g of MnO₂ to 100 cm³ of 'X' mol/L H₂O₂ solution at 'T' °(C) She recorded her observations and plotted a graph as shown in the given figure.
The values of X and T in experiment II could be respectively

A 0.30 and 35
B 0.40 and 30
C 0.25 and 30
D 0.30 and 30.

How to find this?

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PRABHMEHAR KAUR from prabhmehar kaur, chabua

Subject :NSO Class : Class 7

Rihan takes an empty half litre plastic bisleri bottle. He opens the lid and fixes his mouth on the opening in such a way that there is no gap between the opening and his mouth. He observes that the bottle crushes inwards when he sucks some air out of the bottle. Which of the following statements is the reason for Rihan’s observation?

AAir pressure inside the bottle increases.
BAir pressure outside the bottle increases.
CAir pressure inside the bottle decreases.
DAir pressure outside the bottle decreases.

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Ans 1:

Akshat from narayana e techno, BANGALORE

Class : Class 7

Air pressure outside the bottle increases as while drinking the water, the air pressure inside the bottle is reduced as he drinks the water with a force acting towards his mouth. Due to this the amount of air inside reduces and there will be no force exerted on the inner walls of the bottle from the inside.

Ans 2:

Akshat from narayana e techno, BANGALORE

Class : Class 7

Air pressure outside the bottle increases as while drinking the water, the air pressure inside the bottle is reduced as he drinks the water with a force acting towards his mouth. Due to this the amount of air inside reduces and there will be no force exerted on the inner walls of the bottle from the inside.

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Aarav chandak from Witty internatioal school, Bhiwara

Subject :NSO Class : Class 5

Tarun carried out an experiment to compare the rate of evaporation of water. He used four different containers P, Q, R and S. He put 50 mL of water into each container and placed them at the same place. The temperature of water in all the containers was the same. After 5 hours, he observed the amount of water in each container and recorded his results in a table as shown below. Which container has the least exposed surface?

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Aditri Dixit from TCIS, Bangalore

Subject :NSO Class : Class 3

Select the best suitable means of communication to get informed or to inform others for the given situations (X, Y and Z).
X : Your sister’s marriage has been fixed and you want all your relatives and friends to be present at the wedding.
Y : Your grandfather, suddenly, suffered from a heart attack and your father is in his office.
Z : Incidence of tsunami had occurred in Japan.

	X	Y	Z
A	Radio	E-mail	Postcard
B	Letter	Telephonic call	Newspaper
C	E-mail	Television	Fax
D	Fax	Newspaper	E-mail

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Ans 1:

Aditri Dixit from TCIS, Bangalore

Class : Class 3

Ans 2:

Adrito Roy from Stem world School, Kolkata

Class : Class 4

B is the correct answer

Ans 3:

Adrito Roy from Stem world School, Kolkata

Class : Class 4

it will be easier to write a e-mail than a letter

Ans 4:

Nivaan Trisal from GIIS Banerghatta , Bangalore

Class : Class 3

Ans 5:

Avik Arya from Trileaves Global school , Chennai

Class : Class 3

Ans 6:

Avik Arya from Trileaves Global school , Chennai

Class : Class 3

The answer is B

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Dushyant Singh from Shri Ram Centennial School, Indore

Subject :NSO Class : Class 5

If young crescent Moon is observed on the night of 11th January 20XX, then what is expected to appear on the night of 26th January?

AOld Crescent Moon
BYoung Gibbous
COld Gibbous
DFull Moon

answer is c

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Ans 1:

Kiara Saxena from Shishukunj International, Indore

Class : Class 5

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

C

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Aarav Srivastav from DWPS , Noida Extension

Subject :NSO Class : Class 6

Kusum grouped plants broadly on the basis of type of venation present in their leaves. In one of the groups she placed an incorrect member by mistake. Identify the group in which incorrect member is placed.

APetunia, Pea, Hibiscus
BOnion, Bamboo, Gram
CCoriander, Spinach, Mango
DSugarcane, Grass, Banana

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Ans 1:

Aarav Srivastav from DWPS , Noida Extension

Class : Class 7

Ans 2:

Ayush Yadav from Salwan Public School, Gurgaon

Class : Class 6

A

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Aniket Ghosh from DAV Public School Haldia, Haldia

Subject :NSO Class : Class 7

Distance-time graph of an object is shown in the figure. Object is at rest in a time interval from

At₃ to t₄
Bt₂ to t₃
Ct₁ to t₂
Dt₀ to t₁

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Ans 1:

Vasu tyagi from St Joseph's High school, Panvel

Class : Class 6

Answer is D .Because the time is going on but no displacement.so we can also say that the body is in rest

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Amrik Pal from Kendriya Vidyalaya DRDO, Bangalore

Subject :NSO Class : Class 6

The given figure is the cross-section of a lady's finger fruit. Identify (i) the parts labelled 'X' and (ii) the parts of the flower from where they have been developed.

--------(i)-----------------(ii)
APollen grains----Anthers
BSeeds-------------Ovules
COvules------------Ovary
DSeeds--------------Stigma