National Science Olympiad Forum By SOF Olympiad Trainer - Page 319

User Forum

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:

Class : Class 10

Ans 2:

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 3:

Class : Class 10
pls send me detailed solution because i didnt understand how to solve this

Ans 4:

Class : Class 8
I found 14 only. How is it 15? Please explain me!

Ans 5:

Class : Class 8
someone send me the detailed solution of this question

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6

Ans 2:

Class : Class 8
c

Ans 3:

Class : Class 8
c

Ans 4: (Master Answer)

Class : Class 1

C


Post Your Answer

Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Why

Ans 2:

Class : Class 9
how many triangles are there in this figure....correct answer is d

Ans 3:

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 4:

Class : Class 8

Ans 5:

Class : Class 10
in the first biggest square there are 4 triangles as we divide it into 4 parts diagonally.

Ans 6:

Class : Class 8

Post Your Answer

Subject :NSO    Class : Class 9

Post Your Answer

Subject :NSO    Class : Class 2

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7
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 .

Ans 2: (Master Answer)

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.


Post Your Answer

Subject :NSO    Class : Class 6

Post Your Answer

Subject :NSO    Class : Class 8

Ans 1:

Class : Class 6
Yes, it should be. It is given in the solution also

Ans 2:

Class : Class 7
The answer is given correctly in the solution but wrong in the answer. Answer should be a.

Ans 3:

Class : Class 8
Answer should be A

Ans 4:

Class : Class 8
answer should be a.

Ans 5:

Class : Class 9
Shouldn't answer be a instead of b

Post Your Answer

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:

Class : Class 8
i agree man

Ans 2:

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 3:

Class : Class 6
yes the answer should be B

Ans 4:

Class : Class 8

Ans 5:

Class : Class 8
Yes answer should be B...

Ans 6:

Class : Class 10
Answer should have been both ii and iii but there isn't such an option

Ans 7:

Class : Class 8
This is easy

Ans 8:

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 9:

Class : Class 9

Ans 10:

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

Post Your Answer

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