National Science Olympiad Forum By SOF Olympiad Trainer - Page 754
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Ashwin Shridhar from VSA, Bengaluru
Subject :NSO    Class : Class 5

Ans 1:

Bhabani Prasad from Narayan School, Kolkata
Class : Class 6

Ans 2:

SHREYAS ANDOTRA from RYAN INTERNATIONAL SCHOOL, CHANDIGARH
Class : Class 8

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ABHIJEET TIKKHA from APEEJAY SCHOOL NOIDA, Noida
Subject :NSO    Class : Class 8

Pranav, a class VII student collected some China rose petals and placed in a beaker. To this he added some warm water, kept it for some time and then he used this coloured water as an indicator. He collected few samples and tested them with China rose indicator. Which of his observations was/were not correct?
      Sample                     Effect on adding China rose indicator
(i) Soap solution                Turns green
(ii) Curd                             No change
(iii) Soft drink                    Turns dark pink
(iv) Antacid tablet              Turns green

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


this question's answer according to the sofolympiad trainer website is option C. the answer given by the website is wrong, isn't it?

Ans 1:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 9
yes answer should be B

Ans 2:

RiptideMel from Modern Vidya Niketan Senior Secondary School Sec 17, Faridabad
Class : Class 10
Any link with Lopamudra Raut? :-)

Ans 3:

Dr Anupa Ghosh from ,
Class : Class 8
The correct option is B.Because curd is acidic and the indicator should have changed to dark pink color.

Ans 4:

Saanvi Puri from Venkateshwar international school, New delhi
Class : Class 8
It should be b

Ans 5:

Mohak Khetan from Podar International School Powai , Mumbai
Class : Class 8
I think the answer which they told is wrong. The ans should be B.

Ans 6:

lakshay gupta from DPS, New Delhi
Class : Class 9
it should be B as antacids are basic, and they will turn china rose to green

Ans 7:

Siya sharma from Mayoor , Noida
Class : Class 8
B is correct antacids are basic since they are made for curing stomah acidity so it will turn the indicator to green.

Ans 8:

SUBRATA MUKHERJEE from ,
Class : Class 7
Answer should be b

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ravi agarwal from sainik school , Bijapur
Subject :NSO    Class : Class 8

Ans 1:

arnav from the gurukul, Panchkula
Class : Class 5

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is D.

Ans 3:

Arsh Sharma from Bhavan Vidyalaya, Panchkula
Class : Class 8
X can be the harmful and toxic wastes.so as they are released and again gain concentration,the quantity of aquatic animals decrease.Otherwise it was on an increase as the pollution was discharged.

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ravi agarwal from sainik school , Bijapur
Subject :NSO    Class : Class 8

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is B.

Ans 2:

arnav from the gurukul, Panchkula
Class : Class 5

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ravi agarwal from sainik school , Bijapur
Subject :NSO    Class : Class 8

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is B.

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Phani Kumar from Lexicon School, Pune
Subject :NSO    Class : Class 6

Ans 1:

Sunil Menon from ,
Class : Class 6
Option A.

Ans 2:

GAURAB DASH from St Mary's convent school, Baripada
Class : Class 6

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Nirali Rashesh Desai from ,
Subject :NSO    Class : Class 4

Ans 1:

ABHAY AGARWAL from ,
Class : Class 3
answer shd be k

Ans 2:

Aarush from Podar, Mumbai
Class : Class 10
b

Ans 3:

PRANSHU AGRAWAL from The Jain International School, Bilaspur
Class : Class 6
The answer is Bbecause A is a Maharashtrian , C is gujurati , D is bengali and B is punjabi which does not live near coastal areas

Ans 4:

AARUSH from DPS, Mumbai
Class : Class 4
Yes it is B

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Mayuresh Bhatt from MDPS Sect. 87 Faridabad, Faridabad
Subject :NSO    Class : Class 3

Ans 1:

Admin from Revisewise, Noida
Class : Class 3
Syrup (C) is the correct answer as the other two items are solids, whereas syrup is a liquid. First set is all liquids and third set is all gasses.

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Mayuresh Bhatt from MDPS Sect. 87 Faridabad, Faridabad
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is D. The options come in pairs in the body.

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Ashwin Shridhar from VSA, Bengaluru
Subject :NSO    Class : Class 5

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