National Science Olympiad Forum By SOF Olympiad Trainer

Sujay Karmakar from Kendriya Vidyalaya , Salt lake

Subject :NSO Class : Class 10

IF FOCAL LENGTHS OF CONCAVE MIRROR AND CONVEX LENS ARE EQUAL. THEN WHY IT CHANGES WHEN DIPPED IN WATER.

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Shivam Gupta from Army Public School, Noida

Subject :NSO Class : Class 5

Garima performed an experiment to test the properties of four different objects and tabulated her results as follows.

Based on the above given information, which of the following best represents object W, X, Y and Z?

	W	X	Y	Z
A	Iron ball	Thermocol bead	Glass bead	Plastic ball
B	Glass bead	Plastic ball	Iron ball	Thermocol bead
C	Thermocol bead	Iron ball	Wooden bead	Glass bead
D	Rubber ball	Plastic ball	Thermocol bead	Iron ball

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Ans 1:

Anjisha Chakraborty from Mount Litera Zee School, Jabalpur

Class : Class 5

Answer - option C

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Sabhya Kumar from Suncity School, Gurgaon

Subject :NSO Class : Class 7

The steps of wastewater treatment plant are given below randomly.
(i) Wastewater is passed into sedimentation tank.
(ii) Sludge is decomposed by anaerobic bacteria.
(iii) Wastewater is passed through bar screens.
(iv) Wastewater is passed to grit and sand removal tank.
(v) Solids settle at the bottom and floatable materials are removed by skimmer.
(vi) Aeration of water takes place.
(vii) Disinfection of water by adding chlorine.
Which of the following represents correct sequence of steps?

A (iii) → (iv) → (i) → (v) → (ii) → (vi) → (vii)
B (iv) → (iii) → (i) → (v) → (ii) → (vi) → (vii)
C (iii) → (iv) → (v) → (i) → (ii) → (vi) → (vii)
D (iii) → (iv) → (i) → (ii) → (v) → (vi) → (vii)

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Ans 1:

krishna tripathi from nahtfg, mjhiuhgh

Class : Class 8

A

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Ritabrata Das from OPJS, Angul

Subject :NSO Class : Class 5

Which of the following is/are not the function(s) of the part labelled as X in the given figure ?

(i) To absorb water from the soil.
(ii) To transport food to all parts of the plant.
(iii) To transport water to all parts of the plant.
(iv) To hold the plant upright to receive sunlight.

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

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Ans 1:

Shreyasi Padihary from National Public School East , Bengaluru

Class : Class 7

The correct answer is A as it is asking the functions NOT done by X or stem.

Ans 2:

Pratham Dave from GNS, Bangalore

Class : Class 7

X is stem but the function is about the root. Hence correct option is D

Ans 3:

Soumya Sahoo from Pragathi central school, Hyderabad

Class : Class 6

D

Ans 4:

munish jindal from APJ school, Jalandhar

Class : Class 8

Ans 5:

from kalyan, Kalyan

Class : Class 6

They are pointing to the stem and the answer is about rootsð§ð¤

Ans 6:

Samarth Sabari from GIIS, Singapore

Class : Class 9

Which of the following is/are not the function(s) of the part labelled as X in the given figure ? A is answer

Ans 7:

ADRIJA SAHA from DPS RANIPUR, Haridwar

Class : Class 6

The answer is D as X is labeled as stem but the answer is given for root.

Ans 8:

Shabd from Hdfc, Gurgoan

Class : Class 6

It's A as it is asking the functions not done by the stem

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Gitika from Ritchie Park elementary school, USA

Subject :NSO Class : Class 5

Refer to the given flow chart and identify animals P, Q and R.

	P	Q	R
A	Hamster	Hedgehog	Clam
B	Armadillo	Oyster	Turtle
C	Porcupine	Pangolin	Snail
D	Caiman	Platypus	Pila

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Ayushree Barman from Sri Sri Academy, Kolkata

Subject :NSO Class : Class 5

Which of the following damages are associated with acid rain?
(i) Erosion of stone statues and buildings
(ii) Melting of ice caps
(iii) Increase in the number of mosquitoes
(iv) Threat to the life of aquatic beings
(v) Loss of soil fertility.

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

In the solution, it says that the melting of ice caps is an incorrect option, but why? Acid rain is nothing but industrial chemicals that react with water vapour in the air and precipitate in form of hail, snow or rain and is acidic to nature. So in the poles, this acid can fall as snow, so they can melt the ice sheets, right? Please explain this question.

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Anushka Hazarika from DPS Megacity, Kolkata

Subject :NSO Class : Class 6

Anusha and Priya were given some candies in the ratio 4 : 7. Priya ate 9 candies, she still had 15 candies more than Anusha. How many candies did Anusha have?

(A) 30

(B) 32

(C) 41

(D) 15

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arnav from the gurukul, Panchkula

Subject :NSO Class : Class 8

Different zones of a candle flame are marked by the letters P, Q, R and S.

Which of the following statements are correct?
(i) P is the luminous zone and is the hottest part of candle flame.
(ii) In zone Q, there is inadequate supply of oxygen.
(iii) Zone R contains unburnt wax vapours produced by melting of wax.
(iv) In S zone, carbon monoxide burns with a blue flame.

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

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Ans 1:

arnav raj sharma from gulibulium school, new york

Class : Class 8

(D) shall be the answer

Ans 2:

midhuna from ABCD, Hyderabad

Class : Class 8

Blue, Orange, yellow nd black zone.. pl correct me if i am wrong. How (iv) correct?

Ans 3:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Class : Class 8

The S zone is the zone surrounding the wick, where combustion doesn't take place. Hence, statement (iv) is false and the other three are true. Therefore, the answer should be Option D.

Ans 4:

Adway Bachchan from Indian School Sohar, Sohar

Class : Class 8

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arnav from the gurukul, Panchkula

Subject :NSO Class : Class 8

Which of the following statements are true?
I. Yellow flames are ideal for heating.
II. The substances which vaporise during burning give flames.
III. Luminous zone contains unburnt carbon particles.
IV. The non-luminous zone has highest temperature.

A I, II and III
B I, II and IV
C II, III and IV
D I, III and IV

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Ans 1:

Nimish shah from Chrysalis high , Banglore

Class : Class 8

Luminouse zone doesnt contain carbon particles. NSO please fix these errors

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arnav from the gurukul, Panchkula

Subject :NSO Class : Class 8

Which of the following reactions takes place in soda-acid type fire extinguisher?

A CaCO₃ CaO+CO₂
B 2NaHCO₃ Na₂CO₃+H₂O+CO₂
C 2NaHCO₃+H₂SO₄ Na₂SO₄+2H₂+2CO₂
D CaCO₃+H₂SO₄ CaSO₄+H₂O+CO₂

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Ans 1:

Eshaan Chakraborty from The Amaatra Academy, Bengaluru

Class : Class 8

Ans 2:

Amrit Biswas from INDUSVALLEY PUBLIC SCHOOL, Noida

Class : Class 10

it should be h2o instead of h2

Ans 3:

Jaidev Chowdhary from Shamrock International School, VIJAYAWADA

Class : Class 8

Ans 4:

Neh singla from Delhi public school, Chandigarh

Class : Class 5

yes

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