National Science Olympiad Forum By SOF Olympiad Trainer

Subham Mishra from WwA cossipore English school, kolkata

Subject :NSO Class : Class 3

Study the given flow chart carefully.
Cotton and silk are represented by the letters ______ and ______ respectively.

A P, Q
B Q, R
C Q, S
D R, S

R is animal. Natural fibre which we don't get from plant and animal is silk, i.e from insect, which means S is insect.

Ans 1:

Subham Mishra from WwA cossipore English school, kolkata

Class : Class 3

What is the meaning of S here. please clarify. S is something which is natural i believe.

Ans 2:

ADVAY BANSAL from LOTUS VALLEY INTERNATIONAL SCHOOL GURUGRAM, GURUGRAM

Class : Class 6

that was easy

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Bhavya Sheth from Bright Day School, Vadodara

Subject :NSO Class : Class 4

What percentage of air comprises of nitrogen?

A21%
B< 1%
C78%
D81%

Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

C

Air contains approximately 78% nitrogen, 21% oxygen, 0.9% argon, 0.04% carbon dioxide, and small amounts of other gases.

Ans 2:

Rishon Chandy from KV IIT Powai, Mumbai

Class : Class 7

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Anushka Srivastava from Cjm, Dehradun

Subject :NSO Class : Class 7

Which of the following statements is/are correct?
I. The excretory system in humans consist of a pair of kidneys, ureter, urinary bladder, a pair of urethras and urinary opening.
II. In lower animals such as Hydra waste product is excreted by the process of diffusion through the body surface.
III. The urine passes from the kidneys through urethra into urinary bladder.
IV. Urine consists of water, urea and other waste products and urea is breakdown product of proteins.

AI and IV
BII and IV
CII and III
DI and III

i even do think that the 1st option is correct

View All Answers (3)

Ans 1:

Arjun from Sri Kumaran Public School - ICSE, Bengaluru

Class : Class 8

This is wrong. Hydra is a Cnidarian, therefore the waste exits through its mouth.

Ans 2:

Anushka Srivastava from Cjm, Dehradun

Class : Class 7

9jh

Ans 3:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM

Class : Class 10

B

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Amol Athawale from WoodRidge High, aurangabad

Subject :NSO Class : Class 8

The different steps of agricultural practices are given below randomly.

(i) Irrigation	(ii) Ploughing
(iii) Weeding	(iv) Levelling
(v) Harvesting	(vi) Fertilisers
(vii) Sowing	(viii) Crop protection
(ix) Storing seeds

Which of the following represents the correct sequence of these practices?

A (ii) – (iv) – (vii) – (i) – (vi) – (iii) – (viii) – (v) – (ix)
B (iv) – (ii) – (vii) – (i) – (vi) – (iii) – (viii) – (v) – (ix)
C (ii) – (vii) – (iv) – (iii) – (i) – (v) – (vi) – (viii) – (ix)
D (iv) – (vii) – (i) – (ii) – (iii) – (viii) – (ix) – (v) – (vi)

i think correct answer is B not A because levelling is done before ploughing.

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Ans 1:

Amol Athawale from WoodRidge High, aurangabad

Class : Class 7

Ans 2:

Amol Athawale from WoodRidge High, aurangabad

Class : Class 7

Ans 3:

A Venkata Sai Pranav from Podar International School, Bhusawal

Class : Class 9

It should be B

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PARTH MEHTA from Navrachana school, Vadodara

Subject :NSO Class : Class 4

Read the given paragraph with few blanks and select the option that correctly fills up any three of these blanks.
Human adults have P types of teeth in their dentition. These are Q , R , S and molars. Q helps in cutting or biting food. There are T Q in each jaw. R teeth are absent in milk teeth set but there are U such teeth in permanent teeth set. S are four in number and helps in V food.

A P-8, R-Premolars, V-Grinding
B Q-Incisors, T-4, U-8
C S-Canines, T-8, U-4
D P-8, S-Premolars, V-Tearing

View All Answers (3)

Ans 1:

Ibrahim Aslam from uttam, Ghaziabad

Class : Class 2

NA

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

Human adults have 4(P) types of teeth in their dentition. These are Incisors(Q), Premolars(R), Canines(S) and molars. Incisors(Q) helps in cutting or biting food. There are 4(T) Incisors(Q) in each jaw. Premolars(R) teeth are absent in milk teeth set but there are 8(U) such teeth in permanent teeth set. Canines(S) are four in number and helps in Tearing(V) food.

Ans 3:

SAGNIK from Delhi public school, ruby park, kolkata

Class : Class 5

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PARTH MEHTA from Navrachana school, Vadodara

Subject :NSO Class : Class 4

Parts near equator have _________ marked seasons because _________.

A No, they face the Sun for six months continuously
B Clearly, they face the Sun for six months continuously
C No, they retain at almost same angle to the Sun throughout the year
D Clearly, they retain at almost same angle to the Sun throughout the year

View All Answers (6)

Ans 1:

Naisha Gupta from DPS School, Khajaguda, Hyderabad

Class : Class 4

I was kidding

Ans 2:

Hitansh Madhav from GIIS Noida, Noida

Class : Class 4

it is d

Ans 3:

Naisha Gupta from DPS School, Khajaguda, Hyderabad

Class : Class 4

C is correct. This is because they get almost the same amount of sunlight throughout the year. They also get straight rays of the sun.

Ans 4:

Naisha Gupta from DPS School, Khajaguda, Hyderabad

Class : Class 4

(MASTER ANSWER) C

Ans 5:

PARTH MEHTA from Navrachana school, Vadodara

Class : Class 6

Answer shud be d

Ans 6:

Naisha Gupta from DPS School, Khajaguda, Hyderabad

Class : Class 4

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PARTH MEHTA from Navrachana school, Vadodara

Subject :NSO Class : Class 4

Refer to the given flow chart and select the correct option.

	P	Q	R
A	Ant	Silkworm	Termite
B	Mosquito	Termite	Honeybee
C	Grasshopper	Silverfish	Housefly
D	Honeybee	Locust	Silverfish

View All Answers (2)

Ans 1:

suhana priyadarsini nayak from Orchid international school , Bengaluru

Class : Class 6

Answer b will be the correct answer as mosquito is not a social insect while others are termite is not useful insect and honey bee is a useful insect

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

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ISHAN DAS from DELHI PUBLIC SCHOOL , ANGUL

Subject :NSO Class : Class 4

Starting from the first letter, strike out every alternate letter to get the name of a food cooking method and select the correct option.

AIPSITCOKMLOISNRGM
BPCOARNCNEILNAGI
CCSETFEGAHMJIKNLGM
DRDCRFYHIKNLGP

i could not follow the answer,please explain.

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Ans 1:

jathin from national public school chikkabanavara, banglore

Class : Class 4

THE ANSWER C

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Naman from Uis, Bangalore

Subject :NSO Class : Class 3

How many luminous objects are shown in the given box?

A4
B3
C5
D6

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Ans 1:

Anaahad Mehar Satsangi from Delhi Public School Agra, Agra

Class : Class 3

the correct answer will be c

Ans 2:

Shivesh Dan from BAL BHARATI PUBLIC SCHOOL, NOIDA

Class : Class 3

correct answer C because candles, sun, torches, diya, and bulbs are luminous objects and if we count them, there are five luminous objects.

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Shreya Sudarshan from Creaa academy for learning , Bengaluru

Subject :NSO Class : Class 6

Observe the given situation and answer the following questions. Rahul and Ravi are playing in a ground. They start running from the same point X simultaneously in the ground and reach point Y at the same time by following paths marked 1 and 2 respectively, as shown in the figure.

Which of the following is correct statement for the given situation?

A Rahul covers a longer distance with a lower speed.
B Rahul covers a longer distance with a higher speed.
C Rahul and Ravi both cover different distances with same speed.
D Ravi covers a shorter distance with higher speed.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

Rahul and Ravi both cover different distances XOY and XY respectively at the same time. It is clear from the figure that the distance XOY is longer than distance XY .So, the speed of Rahul must be greater than that of Ravi.

Ans 2:

Sarang Shete from Amanora School, Pune

Class : Class 8

b'

Ans 3:

Yashraj from pps, pune

Class : Class 6

bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

Ans 4:

P A Reyyansh from Ann Mary School, Dehradun

Class : Class 10

this was ez

Ans 5:

Vedant from DON BOSCO, CHENNAI

Class : Class 2

rrrrrrrrrrrrrrrrrrr

Ans 6:

Dushyant Singh from Shree Ram Centenial School, Indore

Class : Class 9

Ans 7:

Ashwak from Cambridge, Jalandhar

Class : Class 9

B

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