National Science Olympiad Forum By SOF Olympiad Trainer

Yojas bhagwat from Global Indian International School , Pune

Subject :NSO Class : Class 6

A shadow is formed when light shines on an opaque object. Which of the following is responsible for the changes in the shape and size of a shadow?
(i) Position of the object.
(ii) Position of the source.
(iii) Distance between the object and the light source.
(iv) Brightness of the light source.

A(i) and (ii)
B(i), (ii) and (iii)
C(iii) and (iv)
DAll of these

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Ans 1:

Akshara from sishya OMR , chennai

Class : Class 8

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Niteen Jit Sahu from Diya Academy of Learning, Bengaluru

Subject :NSO Class : Class 4

Planet 'X' is _______.

A Venus
B Mars
C Mercury
D Jupiter

The hottest planet in the universe is KELT 9-B but, the Venus is the hottest planet in the solar planet.

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Bhargav from City Pride School, Nigdi

Subject :NSO Class : Class 7

Prashant observed flowers of two different plants X and Y. Flowers of X are large, coloured, showy and produce nectar while flowers of Y are small, dull without nectar. Pollen grains of X are sticky and bigger while pollen grains of Y are small in size and dry.
Which of the following is correct regarding X and Y?

A X could be pollinated by insect whereas Y could be pollinated by wind.
B X could be pollinated by wind whereas Y could be pollinated by water.
C X could be pollinated by wind whereas Y could be pollinated by insect.
D X could be pollinated by water whereas Y could be pollinated by insect.

In question it is stated that Flower X has nectar.Therefore, it would be A.

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Ans 1:

Bhargav from City Pride School, Nigdi

Class : Class 7

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Bismeet Chetia from NPSI Singapore, Singapore

Subject :NSO Class : Class 4

Select the correct mirror image of Fig.(X).

A

B

C

D

I wrote B

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Ans 1:

Ishaan Chakraborty from Don Bosco , Kasba

Class : Class 9

Thanks But I got 20/40

Ans 2:

Krisha Ganeriwal from Podar International school, Mysore

Class : Class 2

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Niteen Jit Sahu from Diya Academy of Learning, Bengaluru

Subject :NSO Class : Class 4

Find the combination of numbers, so that the given letters are arranged accordingly to form a meaningful word.

A2, 4, 1, 5, 3
B2, 4, 1, 3, 5
C2, 4, 3, 1, 5
D3, 4, 5, 2, 1

The answer should B because the meter is an american word and metre is a Britain word. English was invented by Britain. So this is waste organization.

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Ans 1:

Shubhayu Banerjee from DPS Secunderabad - Nacharam - CBSE, Hyderabad

Class : Class 8

Ans 2:

mishika tripathi from DPS, Gurugram, Haryana

Class : Class 5

answer is c

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ICHALKARANJI from dkte, ichalkranji

Subject :NSO Class : Class 8

Which of the following reactions are possible?
(i) Mg + CuSO₄ → MgSO₄ + Cu
(ii) Ca + MgSO₄ → CaSO₄ + Mg
(iii) Cu + ZnSO₄ → CuSO₄ + Zn
(iv) Fe + MgSO₄ → FeSO₄ + Mg

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

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Bhargav from City Pride School, Nigdi

Subject :NSO Class : Class 7

When current is passed through a conductor, the heat produced in it depends upon
I. The material of the conductor
II. The current flowing through the conductor
III. The time for which the current flows.

A I and II only
B I and III only
C II and III only
D All I, II and III

DeAer hHHUhHionbh,Hhh ii IJxshiobd ojIPJiiohv ivneijv eidsni eiinv i ewiev vivivee feoovjd ein csisfniivd

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Ans 1:

Ronav Kerkar from Jamnabai Narsee School, Mumbai

Class : Class 7

Ans 2:

somesh from Centre point katol road, Nagpur

Class : Class 6

Ans 3:

harini from Sri kumarans children home, Bengaluru

Class : Class 8

Ans 4:

somesh from Centre point katol road, Nagpur

Class : Class 6

Ans 5:

Aarnavi Mann from Scholars rosary Sr. Sec. School, Rohtak

Class : Class 8

Ans 6:

somesh from Centre point katol road, Nagpur

Class : Class 6

Ans 7:

Midhuna from ABCD, Banglore

Class : Class 3

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Bhargav from City Pride School, Nigdi

Subject :NSO Class : Class 7

Sunil and Rohit start at one end of a street, the origin and run to the other end, then head back. On the way back, Sunil is ahead of Rohit. Which statement is correct about the distances run and the displacements from the origin before reaching the origin?

A Sunil has run a greater distance and his displacement is greater than Rohit’s.
B Rohit has run a greater distance and his displacement is greater than Sunil’s.
C Sunil has run a greater distance but his displacement is lesser than Rohit’s.
D Rohit has run a greater distance but his displacement is lesser than Sunil’s.

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Ans 1:

Rithvik from BVM Global, Chennai

Class : Class 9

tricky question

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Pratheek from Null, Null

Subject :NSO Class : Class 6

Which of the following will give red precipitate with Benedict's reagent? A. Apple B. Potato C. Butter D. Fish

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Archishman Pal from Sri Krishna Mission School, Agartala

Subject :NSO Class : Class 4

Read the conversation between three friends.

Select the correct option for P, Q and R.

AP can be steaming, R can be fungi
BP can be roasting, Q can be dehydration
CQ can be dehydration, R can be bacteria
DP can be steaming, Q can be refrigeration

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Ans 1:

Ishan Kapilbhai Barochiya from Mayoor Private School , Abu Dhabi

Class : Class 8

Ans 2:

Sashrika Pasunoori from KV Gachibowli, Hyderabad

Class : Class 5

Can somebody tell? I don't have any idea

Ans 3:

Kahaan Sanghvi from CNS Pune, Pune

Class : Class 4

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