National Science Olympiad Forum By SOF Olympiad Trainer - Page 519

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
wrong ques

Ans 2:

Class : Class 7

Ans 3:

Class : Class 7
Wrong question. NICE

Ans 4:

Class : Class 9
None of the options are correct.

Ans 5:

Class : Class 8
wrong question

Ans 6:

Class : Class 5
yes wrong ques

Ans 7:

Class : Class 9
It is meaningless

Ans 8:

Class : Class 8
it is completely wrong

Ans 9:

Class : Class 8
This question is absolutely wrong

Ans 10:

Class : Class 7

Ans 11:

Class : Class 7

Ans 12:

Class : Class 7
none of the options are correct.

Ans 13:

Class : Class 8

Ans 14:

Class : Class 10
Wrong question

Ans 15:

Class : Class 8
this is wrong . all the options are wrong .

Ans 16:

Class : Class 8
Absolutely Right question matches with the image in question

Ans 17:

Class : Class 7
Wrong Question

Ans 18:

Class : Class 8
Completely wrong image in the question, it makes no sense

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
AN INSULATOR (C)

Ans 2:

Class : Class 6
Wood is a bad conductor of heat. This results in very slow heating of wood. This principle is used when we use wood utensils to cook food. I go by option (B).

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
D I guess,I am not sure

Ans 2:

Class : Class 4

Ans 3:

Class : Class 4
Option D

Ans 4:

Class : Class 6
how can a plant release carbondioxide???

Ans 5:

Class : Class 4
plants can release carbon dioxide at night only tulsi plant does not release carbon dioxide

Ans 6:

Class : Class 9

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
as larva produces and when it is fully produced it forms a cocoon

Ans 2:

Class : Class 7
Ans C

Ans 3:

Class : Class 7
it must be c . at cocoon stage silk is already produced

Ans 4:

Class : Class 7
admin please answer

Ans 5:

Class : Class 8
No, the answer is 'C' only. In pupa stage the silk fiber is only obtained, but actually it is produced by larva and in question it is asked which stage produces fiber. Hence, the answer is 'C".

Ans 6:

Class : Class 8
answer is c because in the pupa stage the silk is already produced and in the larvae stage it produces silk when it is ready to go in the next stage of its life

Ans 7:

Class : Class 8
really confusing ... the answer option d is correct in the sense that produces means extracting the silk or when it is ready to extracted by humans. but option c is correct when produces means that when larva , itself after the fourth moult stage produces silk.

Ans 8:

Class : Class 7
ans:c,you may think d,but only in larval stage it produce silk in option d it is in a cocoon stage it cannot produce silk

Ans 9:

Class : Class 8
I THINK THE ANSWER IS C

Ans 10:

Class : Class 7

Ans 11:

Class : Class 8
no it is c

Ans 12:

Class : Class 8
Answer should be C ,as only larvae in the life cycle of moth produce silk fibres , pupa or cocoon does NOT make silk fibres . They only undergo change in stage IN the silk fibres. They do not have the ability to produce silk fibres !

Ans 13:

Class : Class 9
it is c because the silk has already started getting produces when it is larva

Ans 14:

Class : Class 9

Ans 15:

Class : Class 7
IT IS 'D' BECAUSE AT COCOON STAGE THE CATERPILLAR PRODUCES SILK FIBRES AND KNOTS AROUND IT AND COVERS HIMSELF.AFTER SOME TIME THE SILK FIBRES GETS HARDEN DUE TO THE GUMMY SUBSTANCE WHICH THE CATERPILLAR PRODUCES............IT IS CALLED "FIBROIN" WHICH IS MADE UP OF PROTEINS.ON HEATING THE COCOONS IN WATER THE SILK AGAIN BECOMES SOFT AND IS EXTRACTED FROM COCOONS........THIS PROCESS IS CALLED "REELING OF SILK"

Ans 16:

Class : Class 7
the answer is d only in the cocoon stage they are heated in the hot water so that the reproducing caterpillar will die and it will be very easy to extract silk fiber from it.

Ans 17:

Class : Class 9
also felt d but explanation provided above makes me feel c

Ans 18:

Class : Class 7
OPTION C

Ans 19:

Class : Class 7
This is a trick question.. It says 'produced', not 'obtained'.. The larvae produce the silk fibre, then it is obtained from cocoon..

Ans 20:

Class : Class 8
The answer is C as at that time of a Silkworms life it will produce silk. With that silk they will make a cacoon and then they will become a Moth. While it is a Pupa it does not have the ability to make Silk hence the answer is C

Ans 21:

Class : Class 7
I thought the silk is obtained from the cocoon

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
@Aditya Kumble Same

Ans 2:

Class : Class 7
CEZY PZY LEMONS SQUEEZY PIZA CHEEZY

Ans 3:

Class : Class 6
C

Ans 4:

Class : Class 7
how dumb am i thought c wrote d

Ans 5:

Class : Class 8
c

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8

Ans 2:

Class : Class 8
The correct answer is B.

Ans 3: (Master Answer)

Class : Class 1
The correct answer is B.

Ans 4:

Class : Class 9

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 5

Ans 2:

Class : Class 6

Ans 3:

Class : Class 4

Ans 4:

Class : Class 8
B

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
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Ans 2:

Class : Class 4

Ans 3:

Class : Class 5
Answer will be A). It is because, humus is found on topsoil and not in deep layers of soil.

Ans 4:

Class : Class 4

Ans 5:

Class : Class 4

Ans 6:

Class : Class 4
c correct

Ans 7:

Class : Class 7
I don't know

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Subject :NSO    Class : Class 8

Read the given statements and select the correct option.
Statement 1 : Venus is hotter than mercury though it is far away from the Sun.
Statement 2 : Cloudy atmosphere of Venus reflects almost 75 percent of the sunlight that falls on it.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.


if it reflects lot of sunlight how can it be the hottest planet??

Ans 1:

Class : Class 8

Ans 2:

Class : Class 8

Ans 3:

Class : Class 9

Ans 4:

Class : Class 9
Hi friend. The ans is b. It is the hottest planet because of large amount of CO2 in it which causes greenhouse effect. It is true that it reflects sunlight but this is not the reason for it being hot. HOPE THIS HELPS YOU!!!

Ans 5:

Class : Class 5
hi

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9
the answer is not correct

Ans 2:

Class : Class 5
As per solution, 243 days is longer than a year.

Ans 3:

Class : Class 8
Hii, This means that you gotta name the planet which takes more than one Earth year i.e. more than 365 days to complete one rotation on its axis...Answer is Jupiter

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