National Science Olympiad Forum By SOF Olympiad Trainer - Page 428

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Subject :NSO    Class : Class 5

Refer to the given puzzle.

Four components of food are hidden in the given puzzle. Solve the puzzle and select the option which is not hidden in the puzzle.

AIt builds our body and helps in growth.
BIt is an energy giving nutrient that gives more energy than carbohydrate.
CIt helps the body to get rid of undigested food.
DIt keeps our body fit and helps to resist diseases.


how does carbohydrates help in getting rid of undigested food

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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.


Ans 1:

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

Ans 2:

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

Ans 3:

Class : Class 7
yes

Ans 4:

Class : Class 7
The answer has to be option A

Ans 5:

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

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 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 8
A . cereals , potatoes

Ans 2:

Class : Class 5
B-green leafy vegetables

Ans 3:

Class : Class 3

Ans 4:

Class : Class 5
A

Ans 5:

Class : Class 3
B

Ans 6:

Class : Class 4
B

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Subject :NSO    Class : Class 4

Ans 1:

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 2:

Class : Class 4
D

Ans 3:

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 4
how come??

Ans 2:

Class : Class 7

Ans 3:

Class : Class 9
Since it is in a parallel circuit, resistance offered is more after one of the bulbs is fused. This will increase the brightness of the bulb but decrease the ammeter reading since current is inversely proportional to resistance

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Subject :NSO    Class : Class 5

Ans 1:

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

Ans 2:

Class : Class 5
A

Ans 3:

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

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