National Science Olympiad Forum By SOF Olympiad Trainer - Page 654

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Subject :NSO    Class : Class 7

Ans 1:

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 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

Class : Class 8

Ans 6:

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

Ans 7:

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 8:

Class : Class 8
hcl reacts with metals too

Ans 9:

Class : Class 8

Ans 10:

Class : Class 5
You all are correct

Ans 11:

Class : Class 6
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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.

Ans 13:

Class : Class 10
Hcl reacts with metals also

Ans 14:

Class : Class 9
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 .

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
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 7

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Subject :NSO    Class : Class 5

Ans 1:

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

Ans 2:

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

Ans 3:

Class : Class 3
D

Ans 4:

Class : Class 5

Ans 5:

Class : Class 10

Ans 6:

Class : Class 6
according to Google stapler is a third-class lever

Ans 7:

Class : Class 6
What is type of Option A?

Ans 8:

Class : Class 5
Yes option d is correct

Ans 9:

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 10:

Class : Class 9

Ans 11:

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

Ans 12:

Class : Class 7

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
I was thinking about body building food

Ans 2:

Class : Class 3

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Subject :NSO    Class : Class 8

Ans 1:

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

Ans 2: (Master Answer)

Class : Class 1
The correct answer is A.

Ans 3:

Class : Class 8

Ans 4:

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 5:

Class : Class 8
A

Ans 6:

Class : Class 8
A

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Subject :NSO    Class : Class 8

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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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Subject :NSO    Class : Class 6

Ans 1:

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

Ans 2:

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 3:

Class : Class 6

Ans 4:

Class : Class 9

Ans 5:

Class : Class 10
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Ans 6:

Class : Class 4
yes I also agree with you

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 3
The answer is right - it should be T/10

Ans 9:

Class : Class 9
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 10:

Class : Class 8

Ans 11:

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 12:

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 13:

Class : Class 7
I agree with you

Ans 14:

Class : Class 6
it should be t/21

Ans 15:

Class : Class 8
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 16:

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 17:

Class : Class 7
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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7
ya

Ans 2:

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

Ans 3:

Class : Class 9
In process v, actually sublimation takes place

Ans 4:

Class : Class 7
same

Ans 5:

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

Ans 6:

Class : Class 7
easy

Ans 7:

Class : Class 2

Ans 8:

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

Ans 9:

Class : Class 6

Ans 10:

Class : Class 7

Ans 11:

Class : Class 7
NA

Ans 12:

Class : Class 8
I ALSO AGREE WITH YOU ALL

Ans 13:

Class : Class 6
How in processes v condensation came?

Ans 14:

Class : Class 6
The answer is not B

Ans 15:

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

Ans 16:

Class : Class 2

Ans 17:

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

Ans 18:

Class : Class 7
easyyyyyyyyy

Ans 19:

Class : Class 6
I do agree with Bhabani prasad

Ans 20:

Class : Class 9
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 21:

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

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
The answer is C

Ans 2:

Class : Class 7
yup

Ans 3:

Class : Class 7

Ans 4:

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 5:

Class : Class 5
Class :C

Ans 6:

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

Ans 7:

Class : Class 6
6536e6w33346si7s7474r6ssxfge65eueskibidyohio fanomtax rizzler

Ans 8:

Class : Class 8
The answer is C

Ans 9:

Class : Class 5
C

Ans 10:

Class : Class 7
I prefer option C

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