National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 5

Select the correct statement out of the following.

A Sandy soil needs regular addition of fertilisers as it holds a large amount of water.
B Loamy soil has good qualities of both sandy and clayey soil and thus is most suitable for pottery.
C Clayey soil develops cracks in hot weather causing harm to the roots of plants, thus is not suited for agriculture.
D The water holding capacity is highest in clayey soil and lowest in loamy soil.


Loamy soil is a mixture of sand and clay , which is suitable for growing plants . So, option (B) is also correct

Ans 1:

Class : Class 5
but as given in the options it says that loamy soil is perfect for pottery which is false . Thus the correct answer is option C.

Ans 2:

Class : Class 5
but as given in the options it says that loamy soil is perfect for pottery which is false . Thus the correct answer is option C.

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 3
Correct Answer should be D

Ans 2:

Class : Class 2
Answer is d

Ans 3:

Class : Class 3
correct answer should be D

Ans 4:

Class : Class 2
the correct answer should be D

Ans 5:

Class : Class 2
correct answer should be D here?

Ans 6:

Class : Class 3

Ans 7:

Class : Class 1
correct answer should be D

Ans 8:

Class : Class 3

Ans 9:

Class : Class 2
correct answer should be D

Ans 10:

Class : Class 3
Correct answer should be D

Ans 11:

Class : Class 3

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Subject :NSO    Class : Class 7

During the science activity, Ms Prabha demonstrated an experiment in following steps:

Step 1 : She burned a substance X over the candle flame and white dazzling light was observed. Also white powdery ash was left behind.
Step 2 : She mixed the white ash formed with small amount of water. Then she dipped red and blue litmus papers into the solution one by one.

Which of the following observations are correct?
I. The substance burned in step 1 was magnesium.
II. The white ash formed in step 1 was magnesium oxide.
III. The solution formed in step 2 was acidic in nature
IV. The solution formed in step 2 turned blue litmus red.

A I and II only
B III and IV only
C I, II and III only
D II, III and IV only


I think the correct answer is a but the trainer is showing b

Ans 1:

Class : Class 7
OPTION A

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
D is a flower but others are leaves.

Ans 2:

Class : Class 6

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7
the answer is option c as the compass needle always points to south pole of a magnet.in this figure the compass needle is pointing towards the left hand side magnet's pole which means that pole's polarity is south and the pole of right hand side magnet is north. you should do a practical of this figure!

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7

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Subject :NSO    Class : Class 3

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