National Science Olympiad Forum By SOF Olympiad Trainer - Page 280
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Raavi from DPS, Ranchi
Subject :NSO    Class : Class 7

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Syed Mohammad Hussain from ISAM, Muscat
Subject :NSO    Class : Class 5

Ans 1:

pranesh from kendriya vidyalaya, New Delhi
Class : Class 5

Ans 2:

prithika from Indian school sohar, sohar
Class : Class 5
the answer is A because all the three glasses that is A,B,C is at 75 degrees threfore option A is the right answer

Ans 3:

Shaurya Gote from KV BSF Dantiwada, S K Nagar
Class : Class 5
5I Think that there is right answer given and the right explaination given. As I am a student , ( Kendriya Vidyalaya ) a very very very very great mistake is there in the question image. It is written 75 degree but there should be just tea written there. If you say that the image is right, no problem but the answer should be AAAAA.Do you like the solution? this is written with the supervision and direction of my science teacher.

Ans 4:

Shaurya Gote from KV BSF Dantiwada, S K Nagar
Class : Class 5

Ans 5:

Saransh Singhania from Vidya Mandir estancia, Chennai
Class : Class 8

Ans 6:

Saransh Singhania from Vidya Mandir estancia, Chennai
Class : Class 8

Ans 7:

Shaurya Gote from KV BSF Dantiwada, S K Nagar
Class : Class 5

Ans 8:

Shaurya Gote from KV BSF Dantiwada, S K Nagar
Class : Class 5

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Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Subject :NSO    Class : Class 4

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Saarth Agrawal from Podar International School , Mumbai
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B

Length of the day depends on the speed of rotation of a planet on its axis. The more is the speed the shorter is the length of the day.


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Naavya Kapoor from St Gregorios High school , Mumbai
Subject :NSO    Class : Class 4

A factory was set up in an area which used to discharge its untreated waste down the pipe into nearby water body. After few years the factory was shut down due to some legal action. The given graph shows the changes in the populations of two organisms X and Y over time, before the setting of factory and after it was shut down. Identify X and Y and select the correct option.


A X could be bacteria and Y could be fish.
B X could be prawn and Y and could be a submerged aquatic plant.
C X could be a water bird and Y could be algae.
D X could be algae and Y could be bacteria.


Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

A


Ans 2:

Ashwak from Cambridge, Jalandhar
Class : Class 8
The correct answer is A

Ans 3:

Shreshta from Presidium, Ghaziabad
Class : Class 3
A

Ans 4:

Shreshta from Presidium, Ghaziabad
Class : Class 3
A

Ans 5:

Kanishka malik from Uttam school for girls, Ghaziabad
Class : Class 4
Please explain

Ans 6:

SAPTARSHI SAHA from Hemsheela Model School, Durgapur
Class : Class 8

Ans 7:

Hamzah Inamdar from SHARDA ENGLISH SCHOOL KAIJ DIST BEED, KAIJ
Class : Class 4

Ans 8:

Sargun Maini from The Khaitan School, NOIDA
Class : Class 6

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RICHA BORAH from K V ANNA NAGAR, CHENNAI
Subject :NSO    Class : Class 6

Read the given passage and fill in the blanks by choosing an appropriate option.
Iron nails when new are grey and bright. When exposed to (i), they get covered with a (ii) coating. This process is called (iii) and it is a (iv) change.

(i) (ii) (iii) (iv)
A Moist air Grey Corrosion Chemical, reversible
B Air and water Reddish brown Rusting Chemical, irreversible
C Oxygen in air Green Rancidity Physical, irreversible
D Nitrogen in air Reddish brown Galvani-sation Chemical, irreversible


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Arsh Gupta from Cambridge International School, Jalandhar
Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

D

Wooden ruler is opaque, and it has a definite shape. So, it can be W.

Dough is opaque, and it doesn’t have a definite shape. So, it can be X.

Tracing paper is translucent and has a definite shape. So, it can be Y.

Haze  has no definite shape, and it is translucent. So, it can be Z. Hence, the correct option is D.


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Aman Singh from krishna public school, Bhilai
Subject :NSO    Class : Class 8

Ans 1:

Ankit kumar Jha from Ryan International School , Ghaziabad
Class : Class 9
D should be the answer. because gravity pulls them

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SWARIT JAIN from DPS Greater Noida, GREATER NOIDA
Subject :NSO    Class : Class 4

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Prithvi Bhardwaj from NiBs, Dwarka
Subject :NSO    Class : Class 7

Ans 1:

ASHISH K DIXIT from JASPAL KAUR PUBLIC SCHOOL, NEW DELHI
Class : Class 7
d

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