National Science Olympiad Forum By SOF Olympiad Trainer - Page 549

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

Ans 2:

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 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

Class : Class 10
Hcl reacts with metals also

Ans 7:

Class : Class 5
You all are correct

Ans 8:

Class : Class 8
hcl reacts with metals too

Ans 9:

Class : Class 8
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Ans 10:

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 11:

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 12:

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.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8

Ans 2:

Class : Class 8
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.

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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

Ans 3:

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 4:

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

Ans 5:

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

Ans 6:

Class : Class 7

Ans 7:

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

Ans 8:

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

Ans 9:

Class : Class 5

Ans 10:

Class : Class 6

Ans 11:

Class : Class 6
D

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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: (Master Answer)

Class : Class 1
The correct answer is A.

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8
A

Ans 4:

Class : Class 9
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 5:

Class : Class 8
A

Ans 6:

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

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8

Ans 2:

Class : Class 8
ans : A

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 8
D

Ans 2:

Class : Class 3
i m not getting the answer

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8
Yes it should be t/10 as the pendulum will pass through point y twice in its one revolution...... so the the time period should be t/10

Ans 2:

Class : Class 4
The answer is right - it should be T/10

Ans 3:

Class : Class 6
throughout the time period or the 21 swings the pendulum will pass through the point Y 21 times. so the answer is B(t/21)

Ans 4:

Class : Class 6
It should be T/21 only as T is the total time and no of times it passes Y is 21.Therefore the answer is T/21

Ans 5:

Class : Class 7
Here, in this example, the pendulum passes through y 21 times. So, it will do 10 complete oscillations and 1 half which is basically touching y. Therefore, the time period of the pendulum is T/10.

Ans 6:

Class : Class 6

Ans 7:

Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 8:

Class : Class 8

Ans 9:

Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 10:

Class : Class 7
I agree with you

Ans 11:

Class : Class 4
yes I also agree with you

Ans 12:

Class : Class 9

Ans 13:

Class : Class 6
it should be t/21

Ans 14:

Class : Class 8
Hi The Answer is T/10Sub To my YT:SkyPeRtan Wolf

Ans 15:

Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 16:

Class : Class 8
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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7
same

Ans 2:

Class : Class 6
We can express process v as deposition and how did condensation and freezing get involved

Ans 3:

Class : Class 7
easyyyyyyyyy

Ans 4:

Class : Class 6
How in processes v condensation came?

Ans 5:

Class : Class 7
it is a direct change, so it does have to turn into liquid state

Ans 6:

Class : Class 7
NA

Ans 7:

Class : Class 7
Guys you are wrong process name is deposition but you need to cool it to water then freeze it

Ans 8:

Class : Class 7
The answer can be B and D both.

Ans 9:

Class : Class 7
ya

Ans 10:

Class : Class 6
I do agree with Bhabani prasad

Ans 11:

Class : Class 6
gas to solid is deposition and opposite is sublimation ans wrong

Ans 12:

Class : Class 8
I ALSO AGREE WITH YOU ALL

Ans 13:

Class : Class 8
In process v, actually sublimation takes place

Ans 14:

Class : Class 8
Answer is B because to turn Water vapour into ice you need Deposition but water vapour cannot be deposited that is why you first need to turn the water vapour to water by condensation and then to convert water to ice you need freezing . Hence answer B is correct

Ans 15:

Class : Class 7
easy

Ans 16:

Class : Class 6

Ans 17:

Class : Class 7
I also agree with all of you . That's just impossible, I guess.

Ans 18:

Class : Class 6
The answer is not B

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Subject :NSO    Class : Class 5

Shred a paper in tiny pieces. Take a comb and comb your hair. Now bring the comb closer to the paper pieces. What will you observe?

A The paper pieces will get repelled due to magnetic force.
B The paper pieces will get repelled due to electrostatic force.
C The paper pieces will get attracted and stick to the comb due to electrostatic force.
D The pieces will get attracted and stick to the comb due to frictional force.


Ans 1:

Class : Class 7
I prefer option C

Ans 2:

Class : Class 7
The answer is C

Ans 3:

Class : Class 8
The correct ans is option C because electrostatic force is a non contact force which is similar to magnetic force and the comb is like a magnet and tin pieces of paper are like the metal here (So the comb will attract the tiny pieces of paper).

Ans 4:

Class : Class 5
C

Ans 5:

Class : Class 6
it can also be said as static electricity

Ans 6:

Class : Class 5
The answer is C

Ans 7:

Class : Class 7

Ans 8:

Class : Class 7
yup

Ans 9:

Class : Class 5
Class :C

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