National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 6

Ritu has 500 cm3 of oxygen in a small tank and she wants to transfer all of it to another container. Which of the following containers would be able to hold all the oxygen gas?


AR only
BQ and R
CP, Q and R
DNone of these


There should be a limit on how much we can compress the gas.Are we confidently saying that 500 cm-cube volume can be filled in a 250 cm-cube cylinder?Well and if we have to, will the cylinder construction remain same?If all the gas in the world can be compressed then why do we have to use big tanks or tankers?

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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 8
pls send me detailed solution because i didnt understand how to solve this

Ans 2:

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

Ans 3:

Class : Class 9
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:

Class : Class 9

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Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Class : Class 1

C


Ans 2:

Class : Class 6

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8

Ans 2:

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

Ans 3:

Class : Class 8
Why

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Subject :NSO    Class : Class 9

Ans 1:

Class : Class 9

Ans 2:

Class : Class 9

Ans 3:

Class : Class 9

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 2
B

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
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.


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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 8

Ans 1:

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

Ans 2:

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

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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 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 2:

Class : Class 8
i agree man

Ans 3:

Class : Class 6
yes the answer should be B

Ans 4:

Class : Class 8
I think the question is talking about friction so look for the points which are related to both heat and friction

Ans 5:

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*.

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