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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
hcl reacts with metals too

Ans 2:

Class : Class 8
Hcl reacts with metals also

Ans 3:

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

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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 5
The answer is D because the stapler is the odd one out

Ans 2:

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

Ans 3:

Class : Class 5

Ans 4:

Class : Class 5

Ans 5:

Class : Class 5

Ans 6:

Class : Class 5
Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .

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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: (Master Answer)

Class : Class 1
The correct answer is A.

Ans 3:

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 3
D

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Subject :NSO    Class : Class 6

Ans 1:

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 2:

Class : Class 7
I agree with you

Ans 3:

Class : Class 4
yes I also agree with you

Ans 4:

Class : Class 6

Ans 5:

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 6:

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 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 6

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
How in processes v condensation came?

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

Class : Class 6
I do agree with Bhabani prasad

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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
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 2:

Class : Class 5
The answer is C

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