National Science Olympiad Forum By SOF Olympiad Trainer

Amol Athawale from WoodRidge High, aurangabad

Subject :NSO Class : Class 8

Which of the following materials is the best for making garments and jackets that can be used in wet or damp environment?

A Polyester
B Wool
C Cotton
D None of these

Ans 1:

Ayaan jamal from Dddddd, Delhi

Class : Class 5

i guess cotton too

Ans 2:

RITASHREE ROY from VMS JOKA, KOLKATA

Class : Class 8

it should be cotton ... polyester is synthetic the basic character of polyester is hydrophobic .

Ans 3:

Daksh Saraswat from Rajiv international School, Mathura

Class : Class 8

Shouldn't it be cotton which keeps it cool and comfotable

Ans 4:

Nimish shah from Chrysalis high , Banglore

Class : Class 8

no

Ans 5:

Ankit kumar Jha from Ryan International School , Ghaziabad

Class : Class 9

polyster is the answer

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arnav from Dps noida, Delhi

Subject :NSO Class : Class 6

W

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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:

Ashwak from Cambridge, Jalandhar

Class : Class 9

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

Ans 2:

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 3:

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'

Ans 4:

Yahvi Sahay from D P S electronic city, Bengaluru

Class : Class 8

Ans 5:

Sashriti Das from Delhi Public School Bangalore North, Bangalore

Class : Class 5

Ashwak mind your words

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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

View All Answers (3)

Ans 1:

Antash from Podar , Kalyan

Class : Class 3

Ans 2:

Ajay from Omega, Chennai

Class : Class 6

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%

View All Answers (2)

Ans 1:

Rishon Chandy from KV IIT Powai, Mumbai

Class : Class 7

Ans 2: (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.

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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:

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:

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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