National Science Olympiad Forum By SOF Olympiad Trainer - Page 594

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8

Ans 2:

Class : Class 4
yes according to me also the answer is c but in nso practice papers it is written as d

Ans 3:

Class : Class 8

Ans 4:

Class : Class 7
The correct answer is D.

Ans 5:

Class : Class 5
Ans c

Ans 6:

Class : Class 9
the answer should be B because cocave lens is a diverging lens which will diverge the light to all parts of the room

Ans 7:

Class : Class 7
0hi hi hih h hi hi hi hii

Ans 8:

Class : Class 8
ans= c

Ans 9:

Class : Class 8
A

Ans 10:

Class : Class 9
yes ans c

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7
D is correct

Ans 2:

Class : Class 5
the answer is d

Ans 3:

Class : Class 4
D is correct

Ans 4:

Class : Class 6
I think B and D is correct.

Ans 5:

Class : Class 7
yes you are right

Ans 6:

Class : Class 4

Ans 7:

Class : Class 2

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 8
C

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Subject :NSO    Class : Class 7

Which of the following statements are correct?
I. The tangy taste of cola drinks is due to carbonic acid which is an organic acid.
II. Inorganic acids are prepared artificially in the industries and are extremely corrosive.
III. Hydrochloric acid reacts with metals to varying degrees therefore, it is stored in glass bottles.
IV. Organic acids are weak acids and are used as food supplements.

A I, II and III only
B I and IV only
C II and IV only
D All of these


Why is carbonic acid inorganic even though all organic acids have carbon in their formulae and H2CO3 is the formula of carbonic acid?

Ans 1:

Class : Class 8
Hydrocloric acid is very corrosive and reacts with metals . So HCL is stored in glass bottles because it dont causes damage to it . ..........SO 3 statement should be true and their explanation is wrong .

Ans 2:

Class : Class 7
Q is wrong since option 1 is false, rest all are true

Ans 3:

Class : Class 8
Hydrochloric acid reacts with metals and corrodes them and is therefore stored in glass bottles... This question is wrong and so is the explanation.

Ans 4:

Class : Class 8
Inorganic acids such as minerals acid like HCL , H2SO4 etc . Are. Not always made in factories . HCL is produced in our stomach.

Ans 5:

Class : Class 10
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Ans 6:

Class : Class 5
You all are correct

Ans 7:

Class : Class 10
Hcl doesen't react with metals......Sulphuric acid does

Ans 8:

Class : Class 10
Hcl reacts with metals also

Ans 9:

Class : Class 8
I completely agree... The HCl reacts with metals , which is major reason of why HCl is stored in glass bottles..

Ans 10:

Class : Class 8
hcl reacts with metals too

Ans 11:

Class : Class 7
Yes, I also agree. HCl is a strong acid and reacts with metals almost exactly like H2S04, it is also stored in glass for this reason, question is wrong.

Ans 12:

Class : Class 10
Hcl doesnt react with glass. The explanation is wrong

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 6
i gave the correct answer but in the result they are showing that it is wrong.it is the same case with some other questions too.Please make a note that you correct it,thank you.

Ans 2:

Class : Class 6

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
What is type of Option A?

Ans 2:

Class : Class 5
according to Google stapler is a third-class lever

Ans 3:

Class : Class 8

Ans 4:

Class : Class 7
Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .

Ans 5:

Class : Class 7
The answer is D because the stapler is the odd one out

Ans 6:

Class : Class 5

Ans 7:

Class : Class 8
D

Ans 8:

Class : Class 5
yes because the stapler is a third class lever

Ans 9:

Class : Class 9

Ans 10:

Class : Class 6
option D is correct because stapler is 3rd class lever

Ans 11:

Class : Class 7

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 3

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8

Ans 2:

Class : Class 10
it is A as fertilizers are soluble in water. You might have heard that fertilizers flow into the river and cause eutrophication it flows into river because it is soluble in water

Ans 3:

Class : Class 8
A

Ans 4: (Master Answer)

Class : Class 1
The correct answer is A.

Ans 5:

Class : Class 9
The correct answer is B because manure is soluble in water but it is absorbed very slowly

Ans 6:

Class : Class 8
A

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8
ans : A

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
i m not getting the answer

Ans 2:

Class : Class 8
D

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