National Science Olympiad Forum By SOF Olympiad Trainer - Page 78

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8

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Subject :NSO    Class : Class 7

Most crops require a lot of nitrogen to synthesise the proteins. The bacterium Rhizobium helps some of the crops to get nitrogen. Which of the following statements is incorrect for Rhizobium?

A It converts atmospheric nitrogen into a soluble form that the plants can absorb from soil.
B It can make its own food.
C It lives in the root nodules of leguminous plants like gram, pea, moong etc.
D Leguminous plants provide food and shelter to Rhizobium.


I can't understand

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Subject :NSO    Class : Class 6

The properties of three substances are given below.

Substance Solubility in water Nature
I II III
Soluble Insoluble Insoluble
Non-magnetic Magnetic Non-magnetic

Which of the following sequence of steps should be carried out to separate I from a mixture of I, II and III?

AMagnetic separation, addition of water and sedimentation-decantation.
BEvaporation, magnetic separation, filtration and addition of water.
CEvaporation, magnetic separation, filtration and addition of water.
DFiltration, magnetic separation, addition of water and evaporation.


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Subject :NSO    Class : Class 7

Consider the following statements (I-IV) and fill in the blanks by choosing the appropriate option.

I. An antacid such as P is used to cure indigestion.
II. Lime water contains Q , which turns milky with carbon dioxide.
III. Soap solution is basic due to presence of R . It turns turmeric stain of shirt to red.
IV. Baking soda is S which reacts with vinegar to evolve carbon dioxide gas.

P Q R S
A Milk of magnesia Calcium hydroxide Sodium hydroxide Sodium hydrogen carbonate
B Calcium hydroxide Milk of magnesia Sodium hydroxide Sodium hydrogen carbonate
C Sodium hydroxide Sodium hydrogen carbonate Calcium hydroxide Milk of magnesia
D Sodium hydrogen carbonate Calcium hydroxide Milk of magnesia Sodium hydrogen carbonate


i dont understand

Ans 1:

Class : Class 7
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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
Darn figure! How to get da answer man?

Ans 2:

Class : Class 5

Ans 3:

Class : Class 4
Me too.The figure is in the solution not in the MCQ question paper

Ans 4:

Class : Class 5
where the heck is the figure!!!

Ans 5:

Class : Class 4
they didn't show any "pattern"????????????????????????????????????????????????????????????????????

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 1

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Subject :NSO    Class : Class 1

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
Tearing of paper (Option B)

Ans 2:

Class : Class 5
Tearing of paper (Option B)

Ans 3:

Class : Class 6

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Subject :NSO    Class : Class 3

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