National Science Olympiad Forum By SOF Olympiad Trainer

Joshua Sen from Montfort Senior Secondary School, Roorkee

Subject :NSO Class : Class 7

Two balls are released one after another from the same height. Assume that the air resistance is negligible. Which of the following statements is true regarding the motion of the balls?
Heavier things have a greater gravitational force AND heavier things have a lower acceleration. It turns out that these two effects exactly cancel to make falling objects have the same acceleration regardless of mass.

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Nihal Sri Sai Akveti from winmore, Bengaluru

Subject :NSO Class : Class 6

A block of ice is sliding at a constant speed before moving up a smooth slope as shown in figure. Which of the following options is true about its energy as it is sliding up the slope?

A
B
C
D

dont understnd

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Dia Tandon from Fravashi International Academy, Nasik

Subject :NSO Class : Class 5

Which of the following can be found in the given word grid?

AIt is the reducing phase of Moon from Full Moon to New Moon.
BIt is used to launch an artificial satellite into space.
CIt is the major gas that forms the Sun.
DIt is a force that holds the atmosphere around the Earth.

helium is also a gas that forms the sun. It's there in the grid.

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Ans 1:

Aarvi Gosai from The New Tulip International School, Ahemdabad

Class : Class 5

sun IS made up of mostly helium (maybe)

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savyasachi from montfort , roorkee

Subject :NSO Class : Class 8

In the question below, two statements followed by two conclusions numbered I and II are given. You have to take the two given statements to be true even if they seem to be at variance of commonly known facts and decide which of the conclusion(s) logically follow(s) from the two given statements, disregarding commonly known facts.
Statements :Some books are papers. Some papers are notebooks.
Conclusions :
I. Some papers are books.
II. Some notebooks are papers.

AOnly conclusion I follows
BOnly conclusion II follows
CNeither I nor II follows
DBoth I and II follow

It should be 'A' as we can infer 3 points from the statements. 1) Some books are papers, 2) Some papers are notebooks and 3) Some papers are books. But it not given that only some of the notebooks are paper, it might also be that all notebooks are papers. So according to this, it should be 'A'.

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Parth Milind Patil from ybis, sawantwadi

Subject :NSO Class : Class 8

Fill in the blanks by choosing an appropriate option. The loudness of sound depends on its _(i)_ . The _(ii)_ determines the pitch of a sound. A bird makes a _(iii)_ sound where as a lion makes a _(iv)_ sound. Usually voice of a woman has a _(v)_ frequency than that of a man.

	(i)	(ii)	(iii)	(iv)	(v)
A	Amplitude	Frequency	Low-piched	High-piched	Lower
B	Pitch	Frequency	Low-piched	High-piched	Lower
C	Amplitude	Frequency	High-piched	Low-piched	Higher
D	Frequency	Pitch	High-piched	Low-piched	Higher

how it is

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Abhinav from Delhi Public school , bhiwadi

Class : Class 9

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Iqram Irfan Budihal from JSS Shri Manjunatheshwara English Medium school , Dharwad

Subject :NSO Class : Class 6

B one should be correct

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Iqram Irfan Budihal from JSS Shri Manjunatheshwara English Medium school , Dharwad

Subject :NSO Class : Class 6

Sorry but I do not want to enter post one more time

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Dhairya from Delhi Public School, Bokaro Steel City

Subject :NSO Class : Class 6

Tarun faces towards North. Turning to his right, he walks 25 metres. He then turns to his left and walks 30 metres. Next, he moves 25 metres to his right. Finally, he turns to the right and moves 40 metres. In which direction is he now from his starting point?

ASouth-West
BSouth
CNorth-West
DSouth-East

Ans would be B as not mention any points for sun directions

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Ans 1:

Satyam Rajput from British English School , Gaya

Class : Class 7

D

Ans 2:

Nami Deliwala from Savitridevi Hariram Agarwal International School, Mumbai

Class : Class 8

Ans 3:

Adhrit Tripathi from Elpro International, Pune

Class : Class 10

Ans 4:

Aditya from vidyasagar international school , faridabad

Class : Class 7

D

Ans 5:

Medhansh Malhohtra from Delhi Public School, Noida, Delhi

Class : Class 7

yes

Ans 6:

mugil varman from santham vidhayalaya, triuchrapalli

Class : Class 7

Ans 7:

Dhairya from Delhi Public School, Bokaro Steel City

Class : Class 7

Ans would be B

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Om N M from The Samhita Academy, Bengaluru

Subject :NSO Class : Class 8

Refer to the given food web.

If a non-biodegradable insecticide known as DDT was sprayed onto the pine tree, in which of the following organisms will most of the DDT eventually accumulate?

AGolden-crowned kinglet
BSnake
CRed-tailed hawk
DOak acorns

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Om N M from The Samhita Academy, Bengaluru

Class : Class 8

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Giselle Shah from Sapphire International School, Noida

Subject :NSO Class : Class 5

Find the odd one out a) 23 b)21 c)35 d)51

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