National Science Olympiad Forum By SOF Olympiad Trainer - Page 256

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

Which of the following statement(s) is/are incorrect?
(i) Two thin woollen sweaters are warmer than a thick woollen sweater.
(ii) It saves fuel if we cook food in a vessel which is blackened at the bottom and polished from the sides.
(iii) The cable wires between two poles are left loose because in summers, the wires do not break on expanding.

A Only (i) and (iii)
B Only (ii) and (iii)
C Only (iii)
D Only (i)


How will leaving it loose relate to expansion in summers? Summer should be replaced with winters and expanding we replaced with contracting..

Ans 1:

Class : Class 6
The answer is cSystumm

Ans 2:

Class : Class 6
C

Ans 3:

Class : Class 9

Ans 4:

Class : Class 7

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Class : Class 1

B

Both weaving and knitting can be done by hand as well as by machines.Weaving is done for all types of fibres, not just silk. Knitting is mainly done for wool, but it is also done for cotton, silk, nylon, etc. and not just for wool.


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Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Class : Class 1

D

Whatever be the colour of an object, the colour of the shadow cast by the object is always black. Therefore, the colour of an object cannot be identified by its shadow.


Ans 2:

Class : Class 6
That is the right answer everyone

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
B) On heating ,lid expands more than the neck and thus slides easily.

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 10

Read the given passage and answer the following questions.
Siddhi studied forelimbs of three organisms and described them as follows :
Organism X – Long and short bones, covered with muscles, used for running.
Organism Y – Long and short bones, covered with feathers used for flying.
Organism Z – A layer of a complex chemical with supporting framework which is not made of bones and used for flying.
Select the option that shows correct relationship between these organisms.

A
B
C
D


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