National Science Olympiad Forum By SOF Olympiad Trainer

Devina kashyap from TPS, Mumbai

Subject :NSO Class : Class 5

Which of the following is not a greenhouse gas?

ACarbon dioxide
BMethane
COzone
DSulphur dioxide

sulphur dioxide is a greenhouse gas and infact it possess 100 year global warming potential as compared to any other greenhouse gas whereas ozone is not a green house gas so answer C should be correct and not D

Ans 1:

Soham Hatua from The Hindu Senior Secondary School, Chennai

Class : Class 6

yeah sulphur dioxide forms acid rain

Ans 2:

Atharv Mishra from Podar International School, Mumbai

Class : Class 7

Sulphur dioxide does cause acid rain but, is not a greenhouse gas as, it can not / does not trap heat.

Ans 3:

Shreyasi Padihary from The Cambridge International School , Bangalore

Class : Class 7

Ozone and Sulphur dioxide both are green house gas. All the options are greenhouse gas and there is no correct answer in my opinion

Ans 4:

Mihika Hivarekar from Global Indian International School, Pune

Class : Class 7

Ans 5:

Souradeepto Das Mandal from Hyderabad Public School, Hyderabad

Class : Class 6

ozone traps heat so it is a greenhouse gas

Ans 6:

samanvay sinha from School of India, Bangalore, bengaluru

Class : Class 5

Sulphur dioxide is a greenhouse gas.

Ans 7:

Devina kashyap from TPS, Mumbai

Class : Class 4

sulphur dioxide is a greenhouse gas infact it possess 100 year global warming potential than any other greenhouse gas and ozone is not a greenhouse gas so option C should be correct and not D

Ans 8:

Anvi Ranade from ,

Class : Class 1

I don’t think that ozone is a greenhouse gas …

Ans 9:

shahana from Hindustan international, Chennai

Class : Class 5

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SIDDHARTH SOMANI from Vibgyor High, Mumbai

Subject :NSO Class : Class 3

A force can be either a push or pull. Which of the following classifications has been described INCORRECTLY?

	Action	Type of force	Effect
A	Flicking an insect that is flying towards you	Push	The force sends the flying insect in the opposite direction.
B	Kicking a stationary pebble	Push	The force causes the pebble to roll away.
C	Closing a car door from outside	Pull	The force moves the door.
D	Stretching an elastic wristband	Pull	The force changes the shape of the wristband.

Ans 1:

Isha Bhattacharjee from Newtown School - Kolkata, KOLKATA

Class : Class 5

Option C. is described INCORRECTLY. Because here Type of force is Push not Pull, when the car door is closing from outside.

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vedant from TSRS Aravalli, Gurgaon

Subject :NSO Class : Class 4

Swati left two similar pots, X and Y, having green plants near her window for a week which she used to water regularly. Based on the given diagrams, which of the following statements could be true? 1. The plant in X grows faster than the plants in Y. 2. The plants in Y compete for nutrients and space. 3. The plant in X gets insufficient sunlight and air. A1 and 2 only B1 and 3 only C1 and 3 only D1 and 3 only

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Soham Biswas from Christ Church Boys' Senior Secondary School, Jabalpur

Subject :NSO Class : Class 7

Beena obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, she will have to shift the mirror _______.

(A) Towards the screen

(B) Away from the screen

(C) Either towards or away from the screen depending upon the position of the object

(D) To a position very far away from the screen

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Avani Gupta from St. Mary's, Bhopal

Subject :NSO Class : Class 10

Observe the given graph showing changes in endometrium in a female during her menstrual cycle and select the correct statement regarding P, Q, R and S.

ADuring phase P, secretion of FSH and estrogen increases, which develops the uterine lining.
B Phase R involves release of ovum from an ovary, marked by peak levels of LH and progesterone.
C In phase Q, relaxin hormone attains a peak and repairs endometrium of uterus.
D During phase S, progesterone is secreted from ovary and maintains thickness of endometrium.

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Dhairya Vinayak from Loyola High School, Patna

Subject :NSO Class : Class 7

Refer to the given figure illustrating different types of pollination in plants. Rishi planted three different species of plants (X, Y and Z) in his garden whose seeds are dispersed by explosive mechanism. The given figure shows distribution of these plants in Rishi’s garden over a time period. Now, select the correct statement regarding it.

A X undergoes process P only whereas Y and Z undergo processes Q and R only.
B X could be a male plant of species undergoing only process R whereas Y and Z plants could undergo any of the processes P, Q or R depending upon the type of species.
C X is a plant undergoing only process Q so its population does not increase with time in the absence of other plant of the same species in the garden.
D Plants Y and Z are unisexual plants which can undergo only processes P and Q thereby assuring fertilisation and seed setting in absence of other plants of their species.

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Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

Ans. B is correct

Ans 2:

kumud arora from DPS Indirapuram, Ghaiziabad

Class : Class 7

b

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Dhairya Vinayak from Loyola High School, Patna

Subject :NSO Class : Class 7

Study the given flow chart and fill in the blanks by selecting an appropriate option.

	(i)	(ii)	(iii)	(iv)	(v)	(vi)	(vii)
A	Oxide	Neutral	Acetic acid	Sulphuric acid	NaNO₃	CaCO₃	H₂
B	Base	Salt	Tartaric acid	Formic acid	Na2CO₃	Ca(OH)₂	CH₄
C	Base	Salt	Phosphoric acid	Formic acid	NaHCO₃	Cu(OH)Cl	H₂
D	Oxide	Neutral	Formic acid	Acetic acid	HNO₃	CaO	O₂

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Srija Das from Mount Carmel Convent School, Ahmedabad

Subject :NSO Class : Class 7

Which of the following correctly represents the approximate composition of exhaled air by humans? A O2 = 21% CO2 = 4.4% B O2 = 21% CO2 = 0.03% C O2 = 16.4% CO2 = 4.4% D O2 = 16.4% CO2 = 0.03%

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Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

Option C..

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Ayush Aman from Podar International school , Mehsana

Subject :NSO Class : Class 7

Red cabbage juice is __(i)__ in colour. It will turn __(ii)__ in spinach juice and __(iii) __ in window cleaner. (i), (ii) and (iii) are respectively

ARed, green and pink
BRed, pink and green
CPurple, red and green
DPurple, green and yellow.

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Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

Option C

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Srija Das from Mount Carmel Convent School, Ahmedabad

Subject :NSO Class : Class 7

Which of the following correctly represents the approximate composition of exhaled air by humans? A O2 = 21% CO2 = 4.4% B O2 = 21% CO2 = 0.03% C O2 = 16.4% CO2 = 4.4% D O2 = 16.4% CO2 = 0.03%

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