National Science Olympiad Forum By SOF Olympiad Trainer - Page 619

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
correct answer is B

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
Venus

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
Wrong question. NICE

Ans 2:

Class : Class 8
Senseless question, wrong question and totally different solution. I am disappointed as there are many mistakes.

Ans 3:

Class : Class 9
wrong ques

Ans 4:

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

Ans 5:

Class : Class 8
THAT DOESN'T MAKES SENSE

Ans 6:

Class : Class 7
this is wrong

Ans 7:

Class : Class 8
Firstly, the image itself is totally different from that of the options. None of the options actually fit the image. So, either there should be a "None of these" option or there should be a different image in which at least one option fits. I ask SOF to kindly make the needed changes.

Ans 8:

Class : Class 8

Ans 9:

Class : Class 9
yes wrong ques

Ans 10:

Class : Class 7

Ans 11:

Class : Class 10
Wrong question

Ans 12:

Class : Class 7
Wrong Question

Ans 13:

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

Ans 14:

Class : Class 9
Absolutely Right question matches with the image in question

Ans 15:

Class : Class 8

Ans 16:

Class : Class 9
It is meaningless

Ans 17:

Class : Class 4
wrong question

Ans 18:

Class : Class 8
it is completely wrong

Ans 19:

Class : Class 8
This question is absolutely wrong

Ans 20:

Class : Class 7

Ans 21:

Class : Class 7
none of the options are correct.

Ans 22:

Class : Class 7

Ans 23:

Class : Class 10
None of the options are correct.

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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 5
Option D

Ans 2:

Class : Class 4

Ans 3:

Class : Class 9

Ans 4:

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

Ans 5:

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

Ans 6:

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

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 10
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 2:

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 3:

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 4:

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

Ans 5:

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

Ans 6:

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 7:

Class : Class 8
This is a trick question.. It says 'produced', not 'obtained'.. The larvae produce the silk fibre, then it is obtained from cocoon..

Ans 8:

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

Ans 9:

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 10:

Class : Class 8
I THINK THE ANSWER IS C

Ans 11:

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 12:

Class : Class 7
OPTION C

Ans 13:

Class : Class 9
Ans C

Ans 14:

Class : Class 9

Ans 15:

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 16:

Class : Class 9
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 17:

Class : Class 8
no it is c

Ans 18:

Class : Class 7

Ans 19:

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

Ans 20:

Class : Class 7
admin please answer

Ans 21:

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

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8
c

Ans 2:

Class : Class 6
C

Ans 3:

Class : Class 7
CEZY PZY LEMONS SQUEEZY PIZA CHEEZY

Ans 4:

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

Ans 5:

Class : Class 6
@Aditya Kumble Same

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9
The correct answer is B.

Ans 2:

Class : Class 9

Ans 3:

Class : Class 8

Ans 4: (Master Answer)

Class : Class 1
The correct answer is B.

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 8

Ans 2:

Class : Class 4

Ans 3:

Class : Class 4

Ans 4:

Class : Class 9
B

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