National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 2
B

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 5

Read the given statements and select the correct option.
Statement 1: Naphthalene balls kept in woollen clothes reduce in size after sometime.
Statement 2: Solid naphthalene balls change into gas due to the warmth of woollen clothes.

ABoth statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
CStatement 1 is correct but statement 2 is incorrect.
DBoth statements 1 and 2 are incorrect.


Woolen clothes do not produce warmth, they only prevent loss of heat. Therefore, statement 2 is incorrect. Hence, the correct answer should be C.

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Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

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.


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Subject :NSO    Class : Class 9

Ans 1: (Master Answer)

Class : Class 1

D


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Subject :NSO    Class : Class 9

Ans 1:

Class : Class 9
answer is D.

Ans 2:

Class : Class 3
the ans is D. second inside first inside second.

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

Refer to the given flow chart and select the correct option regarding P, Q, R and S.



APlant P derives nutrition from the host plant with the help of haustoria and possesses hygroscopic roots which absorb moisture directly from atmosphere.
BPlant Q possesses broad thin leaves with superficial stomata.
CPlant R possesses special leaf modifications to catch and digest insects.
DPlant S possesses stilt roots which help in aeration.


all of them are correct

Ans 1: (Master Answer)

Class : Class 1

C

In the given flow chart,P could be parasitic plant,Q could be plant in desert habitat,R could be insectivorous plant and S could be plant situated near coastline.P does not possess hygroscopic roots. They are present in some orchids to absorb moisture from atmosphere.Leaves in desert plants are either absent or reduced or they are present in the form of spines.Stilt roots are adventitious roots that arise from the lower nodes and provide extra support to the plant.They are not meant for respiration. So,options A,B and D are incorrect.


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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6

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