National Science Olympiad Forum By SOF Olympiad Trainer - Page 448

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7

Ans 2:

Class : Class 7
Here, we can see that there are 4 beakers of same length but different widths. So, we can conclude that the widest beaker (beaker-2) has the most water as it will have biggest volume, and the least wide beaker (beaker-3) has the least water as it will have lower volume. Now, when 100 gm of ice is added to all the beakers, ofcourse the beaker with the least volume will cool down first as heat exchange will be least. Now let's see the statements: A- No, beaker-2 has the most water making bigger heat exchange hence it would take most time to cool down. B- No, there is very less water for heat exchange hence ice will melt very late in beaker-2. C- No, there are different amounts of water in all beakers so this is incorrect. D- Yes, it has the least water hence it will cool down fast and more. Correct answer- D.

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 10

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
your answer is wrong baking soda neutralize forming acid

Ans 2:

Class : Class 8
answer should be option a . Baking Soda is used to neutralize forming acid

Ans 3:

Class : Class 8
The answer is option A as baking soda neutralizes the effect of the formic acid

Ans 4:

Class : Class 7
yes

Ans 5:

Class : Class 7
The answer has to be option A

Ans 6:

Class : Class 7
yes

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
answer option(d)ie H

Ans 2:

Class : Class 5
H

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
A

Ans 2:

Class : Class 3

Ans 3:

Class : Class 5
B-green leafy vegetables

Ans 4:

Class : Class 4
B

Ans 5:

Class : Class 3
B

Ans 6:

Class : Class 8
A . cereals , potatoes

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
D

Ans 2:

Class : Class 8
Answer is D as both precipitation and condensation are involved in formation of dew in humid nights. The water vapor condenses to form clouds. But, if precipitation was not there, the dew would have remained in the clouds! So, precipitation is also involved in formation of dew on humid nights. Q and R are condensation and precipitation respectively. Thus, the answer is D(condensation and precipitation) and not B(only condensation).

Ans 3:

Class : Class 4
D

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