National Science Olympiad Forum By SOF Olympiad Trainer - Page 43
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Anika S Kumar from Alphabets International school , Chennai
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

D

When the water of beakers X and Y will be mixed, the final temperature will be somewhere between 50°C-80°C. So the temperature will be < 80°C after an hour.


Ans 2:

Muhammad Ibrahim Siddiqui from The Millennium School - Dubai, DUBAI
Class : Class 7

Ans 3:

Muhammad Ibrahim Siddiqui from The Millennium School - Dubai, DUBAI
Class : Class 7
babuski

Ans 4:

Twisha Arora from Modern Vidya Niketan, Sector - 17, Faridabad, Haryana, FARIDABAD
Class : Class 7
(Master Answer)The correct answer is D.

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Aarnav Grover from Anand Niketan Shilaj, Ahmedabad
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C

In the given figure P, Q, R and S represent different layers of Earth, i.e., crust, upper mantle, lower mantle, outer core and inner core respectively. 


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Naitik Jindal from DELHI PUBLIC SCHOOL RK PURAM, DELHI
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C

Heart, artery and vein of group X are part of circulatory system. Brain and spinal cord of group Y are part of nervous system while liver is a part of digestive system. Kidney, lung and skin of group Z are part of excretory system. Hence, liver cannot be placed in group Y.


Ans 2:

Aarav Chopra from Springdales School, Pusa Road, New Delhi
Class : Class 8
Heart ,artery and veins as you all know are parts of circulatory system . Thus, there is no odd one out in group X. Brain and spinal cord run your nervous system and liver helps in the digestive system . Kidney , skin and even lungs are part of excretory system so group Z is clear .Thus , option 'C' liver is the odd one out as it cannot be placed in group Y .

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Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Subject :NSO    Class : Class 4

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Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C

Earth takes 24 hours for one complete rotation on its axis. If rotational speed of Earth is halved then it will complete one rotation in just double time i.e., 48 hrs. Earth completes one revolution in its orbit around Sun in about 365 days. If distance between Earth and Sun is doubled, i.e., radius of Earth's orbit is doubled then it will complete one revolution around Sun in just double time, i.e., 730 days.


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Aarnav Grover from Anand Niketan Shilaj, Ahmedabad
Subject :NSO    Class : Class 4

Ans 1:

Kiran from DPS, Bengaluru
Class : Class 4
b

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B


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Mohit Sheth from Utpal Shanghvi Global School, Mumbai
Subject :NSO    Class : Class 4

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Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Subject :NSO    Class : Class 4

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Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Subject :NSO    Class : Class 4

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Shiven Dinkar from DPS Noida, Delhi
Subject :NSO    Class : Class 4

Ans 1:

Ryan from YBIS , SINGAPORE
Class : Class 5

Ans 2:

Mohhika Sharma from Delhi Public School Greater Noida, Greater Noida
Class : Class 7
Yes Ashmi ,you are right.One should know the boiling point and freezing point if that person has qualified for level 2.This is so easy-peasy.You can even search on the Google.You will see that me and Ashmi are correct.It is not that you know or not, it is that you should know.And even if you did know, then it is about applying your knowledge at the right place.Also you should know that when we boil water, the water becomes lesser.If you knew both the things then you must have thought that 'B' and 'D' are the same.It happens with me too.I also think the answer should be option 'B'.

Ans 3:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
Boiling point is 100 Degree Celsius C and D are eliminated and if he heats it for 15 min level should be less than 100 ml so A is eliminated so answer is B Don't you know boiling point and freezing point? Boiling point 100 degree celsius Freezing point 0 degree celsius so easy search on google

Ans 4:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Ashmi and Mohhika are are right . If the person has qualified for level 2 then he / she should know the boiling and freezing point of water . If you don't know the boiling and freezing point of water you can also search it in Google and get some more information about this topic . Then you can clearly see that Me , Mohhnika and Ashmi are correct . If you say that A and B are same , then you are wrong because when water boils some of that water evaporates .

Ans 5:

Ryan from YBIS , SINGAPORE
Class : Class 5

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