National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 10

Which of the following statements are correct?
(i) The glass sheet in a solar cooker is responsible for green house effect.
(ii) Acid rain happens because earth’s atmosphere contains acids.
(iii) Biomass is a renewable source of energy.
(iv) Non-conventional sources of energy are nuclear, solar, biomass etc.
(v) Sun can be taken as inexhaustible source of energy.

A(i) and (iv) only
B (ii) and (iii) only
C (iii), (iv) and (v) only
D (i), (iii) and (v) only


the ans is not correct... (iv) is also correct

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Subject :NSO    Class : Class 7

Read the given statements carefully and select the correct option.
Statement 1 : When an ant bites, it injects formic acid into the skin.
Statement 2 : The effect of the acid can be neutralised by rubbing moist baking soda.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DBoth statements 1 and 2 are false.


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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
d

Ans 2:

Class : Class 3
D

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
H

Ans 2:

Class : Class 6
answer option(d)ie H

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
B-green leafy vegetables

Ans 2:

Class : Class 4
A

Ans 3:

Class : Class 4
B

Ans 4:

Class : Class 5
A . cereals , potatoes

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
D

Ans 2:

Class : Class 4
D

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Subject :NSO    Class : Class 7

Three similar light bulbs are connected to a constant voltage d.c supply as shown in the diagram. Each bulb operates at normal brightness and the ammeter (of negligible resistance) registers a steady current.

The filament of one of the bulbs breaks. What happens to the ammeter reading and to the brightness of the remaining bulbs?

Ammeter reading Bulb brightness
A Increase Increase
B Unchanged Unchanged
C Decrease Unchanged
D Decreases Decreases


The correct answer should be D because when current decreases,brightness also decreases

Ans 1:

Class : Class 7

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
A

Ans 2:

Class : Class 6
non of these as all the options are true

Ans 3:

Class : Class 6
non of these as all the options are true

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
D

Ans 2:

Class : Class 6
the answer will be d as all are present in the grid

Ans 3:

Class : Class 5
answer is B. the main mineral present in this rock is quartz-sandstone sandstone can be found in the grid so it is the answer.

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