National Science Olympiad Forum By SOF Olympiad Trainer - Page 544
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Mannat Verma from Vivek High School , Chandigarh
Subject :NSO    Class : Class 5

Ans 1:

Karthik Reddy Munnangi from Chirec International School, Hyderabad
Class : Class 8
I think it should be A as it says that option C is Black Gold is another name for granite, but Black Gold is another name for petroleum.

Ans 2:

Maanvik Srivastava from Cornerstone, Hyderabad
Class : Class 5
THE CORRECT ANSWER IS C, BECAUSE BLACK GOLD IS ANOTHER NAME FOR CRUDE OIL OR PETROLEUM .

Ans 3:

Kaashvi Sharma from Bal Bharati Public School, GRHM, New Delhi
Class : Class 8

Ans 4:

sankerths s from Shishya BELM public School, Bangalore
Class : Class 10

Ans 5:

Pratham Dave from GNS, Bangalore
Class : Class 7
I prefer option C.

Ans 6:

Anantjit Chander from Apeejay School, Sector 15, Faridabad
Class : Class 10
In my case, I feel that (A)is a suitable answer. But the correct option is (C). Why?

Ans 7:

Biju Pappachan from Rkc , Raipur
Class : Class 1
Ans 6 is absolutely right. Ans is C.

Ans 8:

Ybbn from Alphabet International School, Chennai
Class : Class 5
How is this the answer ?

Ans 9:

AREEN from BOLTON, HYDERABAD
Class : Class 6
Ans is C because Black Gold is another name for coal.

Ans 10:

Sanskriti Nagar from Rose Bud Academy, khagaria
Class : Class 5
c is the correct answer

Ans 11:

sarah pranav gothivarekar from Indian School Al Gubra, Muscat
Class : Class 4
black gold is another name for petroleum or crude oil but according to SOF it is granite I think there is some error in this question from SOF

Ans 12:

Siddhant Singhania from AGCS purulia, Puruliya
Class : Class 7

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vrahulprakaash from Amm, Chennai
Subject :NSO    Class : Class 7

Ans 1:

Ashmita Choudhury from Delhi Public School Noida, Noida
Class : Class 8
Tibia and Fibula(option C.)

Ans 2:

Saanvi from rvk, bengaluru
Class : Class 9
tibia and fibula

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Animesh Jain from DPS, Bengaluru
Subject :NSO    Class : Class 6

Ans 1:

Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon
Class : Class 7
tf

Ans 2:

rethish from Veltech, Avadi
Class : Class 3
Let’s check whether the given statements are correct or incorrect:Statement 1: Groundwater is safe for drinking. ----- Correct.Statement 2: Groundwater is free from soluble impurities. ----- Correct.Groundwater is water that accumulates underground. Groundwater is safe for drinking, because it is naturally filtered through layers of rocks and soil. So it is free from soluble impurities. That means Statement 1 is correct, and Statement 2 is the correct explanation of Statement 1.Hence, the right answer is Option A.

Ans 3:

rethish from Veltech, Avadi
Class : Class 3
Let’s check whether the given statements are correct or incorrect:Statement 1: Groundwater is safe for drinking. ----- Correct.Statement 2: Groundwater is free from soluble impurities. ----- Correct.Groundwater is water that accumulates underground. Groundwater is safe for drinking because it is naturally filtered through layers of rocks and soil. So it is free from soluble impurities. That means Statement 1 is correct, and Statement 2 is the correct explanation of Statement 1.Hence, the right answer is Option A.

Ans 4:

Naitik Mundra from International School Rheintal, Buchs Sankt Gallen
Class : Class 9
No ground water has impurities, minerals, gases and some microbes dissolved in it

Ans 5:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Yes the option C is the correct as groundwater is not always safe

Ans 6:

malhar thorve from city internqtional school, satara road, pune
Class : Class 7

Ans 7:

Riya Gupta from Birla Divya Jyoti, Siliguri
Class : Class 8
Answer is option'D'. Neither of the statements are correct. And SOF World, Please listen to our comments and reply to it and rectify your mistakes quickly,ASAP. Iam not here to scold you, but trying to advise you. So please, from the heart of all the students who are commenting(including me), rectify all your mistakes ASAP( AS SOON AS POSSIBLE)!!!!!!!!!!!!

Ans 8:

Devdarsh hero from HOLY GRACE, Mala
Class : Class 6
groundwater sometimes have heavy metals such as lead and arsenic dissolved in them and hence is always not safe for drinking

Ans 9:

Sagnik Chatterjee from Delhi Public School, Greater Noida
Class : Class 7
Ground water is not always safe, it can contain soluble impurities like arsenic

Ans 10:

Udit Kankar from Advanced Academy, Indore
Class : Class 6
Groundwater is safe for drinking but is not free of soluble impurities and that is why we boil it, so the correct option is (C)

Ans 11:

devansh gaurangi from Stella Maris School , Lucknow
Class : Class 8
Some dissolved salts in water is essential for human body and groundwater is free from suspended impurities but it contains soluble things, hence the option is C.

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swagatika from giis, BENGALURU
Subject :NSO    Class : Class 2

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Mannat Verma from Vivek High School , Chandigarh
Subject :NSO    Class : Class 5

Ans 1:

Dvij Agrawal from Lotus Valley International School, Gurgaon
Class : Class 5
i got noooooooo idea

Ans 2:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 3:

Tanmay Chaudhary from MIET public school, MEERUT
Class : Class 7
I HAVE NOOOOOOOOOOOOOO IDEA !!!!!!!!

Ans 4:

Adithi Keshava from National Center For Excellence , Bangalore
Class : Class 7
Option C

Ans 5:

Bhogavalli from Timpany , Visakhapatnam
Class : Class 4
Its C

Ans 6:

Sunita from Dps, Greater Noida
Class : Class 9
Adithi Keshava from National Center For Excellence , BangaloreClass : >Class 5 13 days agoOption C

Ans 7:

Dripto Chakraborty from Greenwood High Sajarpur, Bangalore
Class : Class 5
Not C the answer is D

Ans 8:

Sunita from Dps, Greater Noida
Class : Class 9
Sunita from Dps, Greater NoidaClass : >Class 5 about a minute agoAdithi Keshava from National Center For Excellence , BangaloreClass : >Class 5 13 days agoOption CAns 2:Adithi Keshava from National Center For Excellence , BangaloreClass : >Class 5 13 days agoOption C

Ans 9:

kendre vaishnavi mangesh from podar international school , latur
Class : Class 5

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from Dav public school brs nagaR ludhiana, LUDHIANA
Subject :NSO    Class : Class 5

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Cyril Cyriac from Naipunnya Public School, Cochin
Subject :NSO    Class : Class 1

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Moukthika from Vibgyor, Bangalore
Subject :NSO    Class : Class 3

Ans 1:

saisavit from sri kumaran ps, bangalore
Class : Class 8
B weaver birds

Ans 2:

AAYANSH DHRUV from Orchid The International, Bangalore
Class : Class 5
BB

Ans 3:

SS from meridian, hyderabad
Class : Class 5
Answer is B - Weaver bird.

Ans 4:

Diya Jasmina from Samsidh MLZS, Bengaluru
Class : Class 4
the answer is (B) weaver bird.

Ans 5:

AAYANSH DHRUV from Orchid The International, Bangalore
Class : Class 5

Ans 6:

Shaarvi Pant from Greenwood High, Bangalore
Class : Class 3

Ans 7:

Shaarvi Pant from Greenwood High, Bangalore
Class : Class 3
B Weaver Bird

Ans 8:

Pranay Saurv from Delhi Public School Bangalore-East, Bengaluru
Class : Class 7
its [C] tailor bird

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Avantika Raj from Delhi Public School, Bengaluru
Subject :NSO    Class : Class 3

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Shashank Reddy from Gyan Ganga International School, Pune
Subject :NSO    Class : Class 4

Ans 1:

Mithul Pranav KB from Narayana Olympiad School Madipakkam, Chennai
Class : Class 5

Ans 2:

ishi gupta from DPS NOIDA, NOIDA
Class : Class 4
PLEASE EXPLAIN

Ans 3:

Saarth Agrawal from Podar International School , Mumbai
Class : Class 6
Explaaaaaaaaaaaaaaaaaaaaaaiiiiiiiiiiiiiiiiiiiiiin

Ans 4:

Mithul Pranav KB from Narayana Olympiad School Madipakkam, Chennai
Class : Class 5
ANSWER IS (a)

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