National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 2

Ans 1: (Master Answer)

Class : Class 1

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Subject :NSO    Class : Class 5

A student investigates erosion using four kinds of equal amount of earth materials: top soil, clay, sand and soil planted with grass. Equal amounts of water is allowed to flow from the surface of each type of earth material. The water is then separated out from the earth material with the help of a filter. The given figure shows the amounts of earth material that are collected. The results of this investigation best support which conclusion?


ATop soil is easily eroded.
BSand has a smooth texture.
CWater travels fastest through soil planted with grass.
DWater drains most quickly through clay.


Can you please explain.

Ans 1:

Class : Class 4
answer a soil erosion will occur

Ans 2:

Class : Class 5
top soil is easily eroded (a)

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Subject :NSO    Class : Class 9

Ans 1:

Class : Class 6
Ans. is A sublimation

Ans 2:

Class : Class 9
The answer is A.sublimation

Ans 3:

Class : Class 9
Sublimation because it is the process of change of state of matter from solid to gas without changing into liquid state.

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Subject :NSO    Class : Class 9

Which of the following statements about the given experimental set-up is/are incorrect?

I. It is used to separate a mixture of two or more miscible liquids for which the difference in boiling points is more than 25 K.
II. It is used for the separation of different gases from air.
III. It is used to separate acetone and water from their mixture.
IV. It is based on the principle of repeated cooling and condensation of vapours by providing surface for the vapours.

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


Ans 1:

Class : Class 9
3 and 1 only

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Subject :NSO    Class : Class 8

Ans 1: (Master Answer)

Class : Class 1

The correct answer is D

The electonic configuration of manganese (atomic number=25) is 1s2 2s2 2p6 3s2 3p6 3d5 4s2


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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 6

Which of the following statements is correct ?
(i) The response of plant towards the Earth is called phototropism .
(ii) The ability of certain animals to blend with the surrounding, making them difficult to spot is called camouflage.
(iii) Whales and dolphins breathe in oxygen from water through gills.
(iv) Hibernation is an adaptation for escaping hot weather.

A(i) and (ii)
B(ii) and (iv)
C(i) and (iv)
D(iii) and (iv)


escaping hot weather is called aestivation . hibernation is escaping from cold weather .

Ans 1:

Class : Class 5
not a because The response of plant towards the sun is called phototropism

Ans 2:

Class : Class 8
YES The correct answer is (A).

Ans 3:

Class : Class 7
I WANT EXPLAINATION

Ans 4:

Class : Class 7
THE CORRECT ANSWER IS (A)

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
All the properties friction are in use. Hence, the correct one option 'D'.

Ans 2:

Class : Class 8

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Subject :NSO    Class : Class 8

Ans 1: (Master Answer)

Class : Class 1

The correct answer is C.


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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 4
B) 2 and 3

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