National Science Olympiad Forum By SOF Olympiad Trainer

arjun from the bishops school camp , pune

Subject :NSO Class : Class 7

Which of the following substances is/are present in a higher percentage in exhaled air than in inhaled air?
(i) Carbon dioxide
(ii) Oxygen
(iii) Water vapour
(iv) Nitrogen

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

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Ans 1:

Antareep Mukherjee from New Horizon Public School, Bangalore

Class : Class 8

Ans 2:

Antareep Mukherjee from New Horizon Public School, Bangalore

Class : Class 8

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Ayush Singh from LMB, Kolkata

Subject :NSO Class : Class 4

Study the given diagram showing part of the Solar System and answer the following questions.

The orbit marked as 'X' is of ______.

A Moon
B Sun
C Comet
D Earth

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Ans 1:

Yahvi Sahay from D P S electronic city, Bengaluru

Class : Class 8

Ans 2:

Sashriti Das from Delhi Public School Bangalore North, Bangalore

Class : Class 5

Ashwak mind your words

Ans 3:

Ashwak from Cambridge, Jalandhar

Class : Class 9

Every person who says the answer is A , B or D is MAD

Ans 4:

Tanirika Bansal from DPS Faridabad, Faridabad

Class : Class 4

sun has no orbit and moon has orbit around the earth so the answer is C .... COMMET

Ans 5:

GAIRIK GHOSH from ST. AUGUSTINE'S DAY SCHOOL, BARRACKPORE, AGARPARA

Class : Class 6

The orbit marked as 'x'is of the sun i.e. option 'B'

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prithika from Indian school sohar, sohar

Subject :NSO Class : Class 5

what is the answer for this?

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Aarav Gupta from Cambridge International School, Jalandhar

Subject :NSO Class : Class 6

A few changes are given as follows:
(i) Spinning of top
(ii) Occurrence of day and night
(iii) Formation of curd from milk
(iv) Curdling of milk by adding lemon juice
(v) Digestion of food
(vi) Burning of paper
Which of the following represents the correct classification of these changes?

A(i), (iv) and (vi) are physical irreversible changes while (ii), (iii), (iv) and (v) are chemical changes.
B(i), (iv) and (vi) are fast changes while (ii), (iii) and (v) are slow changes.
C(ii), (iv), (v) and (vi) are desirable changes while (i) and (iii) are undesirable changes.
DNone of these

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Ans 1:

Ajay from Omega, Chennai

Class : Class 6

Ans 2:

Antash from Podar , Kalyan

Class : Class 3

Ans 3:

Shweta Garg from Vibgyor high, Vadodara

Class : Class 8

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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.

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Ans 1:

ADVAY BANSAL from LOTUS VALLEY INTERNATIONAL SCHOOL GURUGRAM, GURUGRAM

Class : Class 6

that was easy

Ans 2:

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.

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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%

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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

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Ans 1:

Anushka Srivastava from Cjm, Dehradun

Class : Class 7

9jh

Ans 2:

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 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:

A Venkata Sai Pranav from Podar International School, Bhusawal

Class : Class 9

It should be B

Ans 2:

Amol Athawale from WoodRidge High, aurangabad

Class : Class 7

Ans 3:

Amol Athawale from WoodRidge High, aurangabad

Class : Class 7

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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

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Ans 1: (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 2:

Ibrahim Aslam from uttam, Ghaziabad

Class : Class 5

NA

Ans 3:

SAGNIK from springdale primary school , kolkata

Class : Class 4

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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

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Ans 1:

PARTH MEHTA from Navrachana school, Vadodara

Class : Class 6

Answer shud be d

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