National Science Olympiad Forum By SOF Olympiad Trainer - Page 330
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Sarthak Gupta from Delhi Public School Sector 12 R K PURAM, NewDelhi
Subject :NSO    Class : Class 8

A pile of cubes of equal size is arranged in the form of a block as shown in the figure. If the block is dipped into a bucket filled with red paint, so that only the surfaces of the block get coloured, then how many cubes are coloured on three faces only?


A14
B15
C16
D12


Answer should be 17 cause there are 5 cubes with three faces painted at the top. There are also the 2 corner cubes on the first level that have not been considered in the solution. Pls correct this mistake cause you guys dont correct even a single question. Not expected from you :(

Ans 1:

Sarthak Gupta from Delhi Public School Sector 12 R K PURAM, NewDelhi
Class : Class 10

Ans 2:

Mriganka Bhusan Das from Sampoorna Kendra Vidyalaya, Dibrugarh
Class : Class 8
I found 14 only. How is it 15? Please explain me!

Ans 3:

Sarthak Gupta from Delhi Public School Sector 12 R K PURAM, NewDelhi
Class : Class 10
Answer should be 17 cause there are also the the corner cubes which have 3 face painted which have not been considered in the question. Pls correct this questions you guys dont correct any questions which have been challenged on the forum. Very lousy service not expected :(

Ans 4:

fatima from mahatma phule english school, degloor
Class : Class 8
someone send me the detailed solution of this question

Ans 5:

Gauri from Presidium, Gurgaon
Class : Class 10
pls send me detailed solution because i didnt understand how to solve this

Post Your Answer

Mohammed Kashif Ahamed from Smt Kamalabai Educational Trust, Bangalore
Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C


Ans 2:

Kanishk Mukherjee from BDM International, Kolkata
Class : Class 6

Ans 3:

Siddhant from Mris, ludhiana
Class : Class 8
c

Ans 4:

Siddhant from Mris, ludhiana
Class : Class 8
c

Post Your Answer

AKSHAJ SRIVASTAVA from MOUNT LITERA ZEE SCHOOL, Kanpur
Subject :NSO    Class : Class 8

Ans 1:

AKSHAJ SRIVASTAVA from MOUNT LITERA ZEE SCHOOL, Kanpur
Class : Class 9
how many triangles are there in this figure....correct answer is d

Ans 2:

Arnav Diwan from F.A.I.P.S Kuwait, Kuwait
Class : Class 10
in the first biggest square there are 4 triangles as we divide it into 4 parts diagonally.

Ans 3:

Daksha Swaminathan from Horiozon Scholars and Neo Kids, Mumbai
Class : Class 8

Ans 4:

Dhairya Vinayak from Loyola High School, Patna
Class : Class 8

Ans 5:

Arnav Diwan from F.A.I.P.S Kuwait, Kuwait
Class : Class 10
in the first biggest square there are 4 triangles and then when you see the corners there are again 4 triangles (because of the rhombus) then the 4 triangles in the corner are divided into 2 parts parts so there are total 8 small triangles and now if we divide the square diagonally we will get triangles we can divide it in 4 ways so now in total we have 20. now in bigger the rhombus in the corners of it you can find total 4 triangles. then in the smaller square we have a similar square as the bigger one so again 20. in total there are 20 4 20 = 44 and it is not in answer so it is none of these (d)

Ans 6:

Student from School, City
Class : Class 8
Why

Post Your Answer

CHIRAG from JINDAL VIDYA MANDIR, RATNAGIRI
Subject :NSO    Class : Class 9

Post Your Answer

S Pooja from Kendriya Vidyalaya No 2 Kalpakkam, Kanchipuram
Subject :NSO    Class : Class 2

Post Your Answer

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 .

Post Your Answer

Naveed from shining star public high school , mumbai
Subject :NSO    Class : Class 6

Post Your Answer

Ishat from DPS, GURUGRAM
Subject :NSO    Class : Class 8

Ans 1:

Navya Jain from DPS Dwarka, delhi
Class : Class 6
Yes, it should be. It is given in the solution also

Ans 2:

Akshara from NPS, Bengaluru
Class : Class 8
Answer should be A

Ans 3:

Kaushik Srivatsa H from Bala Vidya Mandir Global, Bangalore
Class : Class 7
The answer is given correctly in the solution but wrong in the answer. Answer should be a.

Ans 4:

Bhavtosh Tripathi from Maneckji Cooper Education Trust School, Mumbai
Class : Class 9
Shouldn't answer be a instead of b

Ans 5:

Antarik Maity from Bharatiya Vidyabhaban, Kolkata
Class : Class 8
answer should be a.

Post Your Answer

Ishat from DPS, GURUGRAM
Subject :NSO    Class : Class 8

A fire can be made by rubbing two objects together such as rubbing two pieces of rock having rough surfaces. Which of the following statements explain why a fire can be made by rubbing two objects together?
(i) Friction slows down moving objects.
(ii) Fire gives out heat and light energy.
(iii) Friction produces heat.
(iv) Fire has no mass.

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


incorrect answer

Ans 1:

Navya Jain from DPS Dwarka, delhi
Class : Class 6
yes the answer should be B

Ans 2:

Arnav Diwan from F.A.I.P.S Kuwait, Kuwait
Class : Class 10
Answer should have been both ii and iii but there isn't such an option

Ans 3:

Pragun goel from Venkateshwar International School, Delhi
Class : Class 8
This is easy

Ans 4:

Tejashree Colvalcar from Sharda Mandir School, PANAJI GOA
Class : Class 7
the answer is B because fire is caused due to friction not because it gives ot heat and light energy. Sof , could you please clear my doubt

Ans 5:

Arnav Raj Sharma from GEMS International School the ultra master mega, Gurgaon
Class : Class 7
I think the question is talking about friction so look for the points which are related to both heat and friction

Ans 6:

Student from School, City
Class : Class 8
On rubbing two sticks together, friction produces heat and this leads to warming until the ignition point of the substance, when it catches fire. As per the options, onrubbing two sticks, *FIRE*produces heat and light and this *PRODUCES FIRE*.

Ans 7:

Akshara from NPS, Bengaluru
Class : Class 8
Yes answer should be B...

Ans 8:

Zach from Frank Anthony public school, Bangalore
Class : Class 8
i agree man

Ans 9:

Trina from Ganges Valley School, Hyderabad
Class : Class 9

Ans 10:

Karan Oberoi from Amanora School, Pune
Class : Class 8

Post Your Answer

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

Which of the following vehicles runs on diesel or petrol?

A
B
C
DAll of these


If bikes have a small engine they will work on petrol only. If cars have medium engine they will work on both petrol and diesel. If trucks have large engine they will work on diesel only.CC of: Bikes: 100 CC Cars: 1000 CC Trucks: 2000 CC And how can you relate all of this with electricity? You have given nowadays cars run on CNG, solar energy and electricity! HOW IN THE WORLD CAN YOU RELATE PETROL AND DIESEL with SOLAR ENERGY AND ELECTRICITY? This question has a simple answer. If you think D answer the questions listed below. 1. Does truck run on petrol? No. 2. Does car run on both petrol and diesel? Yes. 3. Does motorbike run on diesel? No. So answer is A So simple it is!!! If you think D please explain it to me If you think A please do agree

Post Your Answer