National Science Olympiad Forum By SOF Olympiad Trainer - Page 246

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Subject :NSO    Class : Class 8

Identify processes X and Y from the given statements and select the option that correctly identifies the microorganisms involved in them respectively.
X : Conversion of complex organic compounds into ammonia
Y : Conversion of nitrates in soil to free nitrogen

  X Y
A Aspergillus Bacillus
B Micrococcus Thiobacillus
C Pseudomonas Nitrocystis
D Bacillus Pseudomonas


D

Ans 1:

Class : Class 8
Answer is (D); the conversion of nitrates in soil to free nitrogen is performed by bacterial species such as Pseudomonas under anaerobic conditions.

Ans 2:

Class : Class 9
B

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
My hand slipped!

Ans 2:

Class : Class 5

Ans 3:

Class : Class 7
b

Ans 4:

Class : Class 8
B is CALCIUM unscrambled

Ans 5:

Class : Class 5
EASY

Ans 6:

Class : Class 5
B

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 1

Ans 1:

Class : Class 9
The Answer is Moon , which is the option (d) .

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Subject :NSO    Class : Class 7

To prepare a blood smear slide a student placed a drop of blood on a glass slide and added a drop of distilled water to dilute the blood. He then added stain (a coloured chemical used to see the cells) to it before placing the coverslip over it. When viewed, under the microscope he could not see the blood cells. Which of the following best explains this?

AThe blood cells had burst.
BThe blood had dried before the water was added.
CThe drop of water diluted the blood too much and cells dispersed too far away from each other.
DThe water caused the cells to shrink.


Ans 1:

Class : Class 8

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 9
easy peasy B is the answer

Ans 2:

Class : Class 6
the answer's B (I accidently clicked on C)

Ans 3:

Class : Class 5
B is the answer because it actually feels like constellations are moving when actually it is the planet which is rotating making us feel like the planet is moving. and the similar things also happens with clouds

Ans 4:

Class : Class 5

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Subject :NSO    Class : Class 6

What are the characteristics of metals?

A Good conductors of electricity and heat; solid at room temperature; transparent, shine brightly when polished.
B Good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films; do not shine at all when polished.
C Bad conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films.
D Good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films; shine brightly when polished.


answer is a extremely simpleclearbahut Hassan saval

Ans 1:

Class : Class 7

Ans 2:

Class : Class 9
Answer should be B..

Ans 3:

Class : Class 8
Answer is D

Ans 4: (Master Answer)

Class : Class 1

D

Except mercury all the metals are solid at room temperature.


Ans 5:

Class : Class 8
d

Ans 6:

Class : Class 9
Except the metal Mercury all metals are solid at room temprature. Thus the answer shoul be B.

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