National Science Olympiad Forum By SOF Olympiad Trainer

Archit Das from NPS, Singapore

Subject :NSO Class : Class 3

Refer to the given flow chart and select the INCORRECT option regarding P, Q, R and S. A Both P and Q have webbed feet and P lives in very cold regions of Earth. B R is a predator bird that makes nests called eyries on branches of tall trees or on rocks. C Both Q and R have three toes in front and one toe at the back. D S has long legs and spread out toes that help it to wade through water.

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Kushagra Sah from Bahrain Indian School, Manama Bahrain

Subject :NSO Class : Class 3

Mishika looked at the sky at night and noticed that there was in the sky. It was her birthday, i.e., 7^th January. Her brother, Mohit's birthday falls exactly two weeks after her birthday. Which shape of Moon would she most likely observe on her brother's birthday?

A
B
C
D

I did silly mistake

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Ans 1:

Kushagra Sah from Bahrain Indian School, Manama Bahrain

Class : Class 9

I did silly mistake

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Kushagra Sah from Bahrain Indian School, Manama Bahrain

Subject :NSO Class : Class 3

The given box contains some letters. Name of which of the following can be obtained using these letters? (You can use each letter more than once.)

A P E R L A E N O B C Q

AThe means of transport which runs on track.
BThe means of transport which carries people and goods via sea.
CThe means of transport driven by manpower.
DA means of air transport.

I did silly mistake

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Ans 1:

Kushagra Sah from Bahrain Indian School, Manama Bahrain

Class : Class 9

I did silly mistake

Ans 2:

Ekaansh Dev Singh from Delhi Public School Jamnagar, Jamnagar

Class : Class 4

man come on

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Kushagra Sah from Bahrain Indian School, Manama Bahrain

Subject :NSO Class : Class 3

Kavita wants to push her cart up the plank. Which of the following planks will be most difficult for her to push the cart up?

A
B
C
D

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Ans 1:

Kushagra Sah from Bahrain Indian School, Manama Bahrain

Class : Class 9

I just did silly mistake

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Chinmay from SBPPS, Pune

Subject :NSO Class : Class 6

Refer to the given dichotomous key and select the correct option.
I. a. Its edible part grows above ground. - Go to II
b. Its edible part grows below ground. - Go to III
II. a. It has reticulate venation in leaves - P
b. It has parallel venation in leaves - Q
III. a. It has tap root system - R
b. It has fibrous root system - S

A P could be coriander whereas R could be radish.
B Q could be potato whereas S could be onion.
C Q could be maize whereas R could be wheat.
D P could be mustard whereas S could be pea.

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D Sneha from Kailash maanasarovar school, SALEM

Subject :NSO Class : Class 4

Ten male animals, each of type X and Y were living together for last few months in captivity in a well defined area (full of greenery). Other types of animals were not present in this area. Then an animal Z was introduced in this area. After few days, their numbers were counted and tabulated as shown here.

What does this indicate?

A Z is a carnivore.
B Y is a herbivore.
C X is a herbivore.
D All of these

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Ans 1:

smartie girl from Euro School Kharadi, Pune

Class : Class 4

d... but why?

Ans 2:

Divyanshi Rajashekar from Vidyashilp Academy, Bangalore

Class : Class 10

D

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Bhavya Agrawal from Cambridge Court High School , JAIPUR

Subject :NSO Class : Class 5

Rini was asked to write some involuntary actions. She has written some voluntary actions also as shown in the list.

(i) Chewing food
(ii) Sitting upright on a table
(iii) Digestion of food
(iv) Beating of heart
(v) Singing a song
(vi) Dancing
(vii) Breathing
(viii) Writing a letter

Select the option that contains only involuntary actions.

A(i), (iii), (vii) and (viii) only
B(ii), (vi) and (vii) only
C(iii), (iv) and (vii) only
D(ii), (v), (vi) and (vii) only

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Jasmine Kaur from Venkateshwar International School , New Delhi

Subject :NSO Class : Class 5

Which of the following groups of seeds contains only dicot seeds?

AWheat, Rice, Maize
BPea, Maize, Bean
CPea, Bean, Gram
DMaize, Gram, Pea

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Aarav Mittal from DPS, Chandigarh, Ambala

Class : Class 7

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Niraj agarwal from Delhi public school , Digboi

Subject :NSO Class : Class 10

A wire is being drawn to make it thinner such that the length of the wire l increases and radius r decreases. Its resistance R will finally be proportional to

A
B
C
D

the solution given is wrong it is proportional to 1/r^2

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krish Singla from DELHI PUBLIC SCHOOL, BATHINDA

Subject :NSO Class : Class 9

The given graph shows the variation of boiling point of water with pressure.

Which of the following best represents the state(s) of water at points X, Y and Z?

	X	Y	Z
A	Gas, Liquid	Liquid	Solid
B	Liquid	Liquid, Gas	Gas
C	Solid	Liquid, Solid	Gas
D	Liquid	Liquid, Gas	Solid

ans c

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Ans 1:

krish Singla from DELHI PUBLIC SCHOOL, BATHINDA

Class : Class 9

ans c

Ans 2:

Rithvik from BVM Global, Chennai

Class : Class 9

isnt the ans c?

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