National Science Olympiad Forum By SOF Olympiad Trainer - Page 479

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6

Ans 2:

Class : Class 7
In a field research, some rats were kept in a wheat field. Their presence in the wheat field would affect the number of wheat plants over a certain period of time.Rats burrow in the soil of wheat field and cause damage to the crop roots. So, the number of wheat plants would fall over a period of time. Rats also feed on ripening ear heads and ripened grains. So, their population would increase fast. The more they are in number, the more damage they would cause to the plant roots, and the more grains they would eat.So, the number of wheat plants in the field would keep decreasing.The following graph would show the change in the number of wheat plants correctly:In the above graph, the number of wheat plants is constantly falling over a period of time. Hence, the right answer is Option C.

Ans 3:

Class : Class 10
C,as the wheat plants decrease in number.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7

Ans 2:

Class : Class 7
It will be option D. It will be D as it can be understood from the pictures that S is a room heater which is run by electric. Heat comes out of it. It is therefore used to keep our surroundings warm. Thank you .

Ans 3:

Class : Class 6
but others also produce heat energy?

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5

Ans 2:

Class : Class 5
C

Ans 3:

Class : Class 9
It is C , guys....

Ans 4:

Class : Class 6
coal and petroleum are non renewable sourcesbut wind is made up of air and air contains so many gases .Therefore wind cannot be exhausted so wind is renewable resources

Ans 5:

Class : Class 7
Answer is C.

Ans 6:

Class : Class 5
Answer is c because coal and petroleum can be finished but wind will never get finished

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Subject :NSO    Class : Class 5

Select the correct statement from the following.

A If blisters are formed due to severe burn, they should be immediately pricked and vinegar should be applied on the burnt area.
B Toothpaste should be applied to the skin area where the snake has bitten and the victim should be positioned such that the bitten part lies above the level of heart.
C If a person is bleeding through nose he should be made to lie down flat on ground with head held back.
D Both A and B


Ans 1:

Class : Class 8
In option c, the person must bend head forward to let blood darin out through nose and not down the throat. So option c is wrong.Also sitting is better than lying, as if nose is above heart that reduces the pressure, so option C is terribly wrong

Ans 2:

Class : Class 5
wrong answer as the person should tilt his head sightly forward.

Ans 3:

Class : Class 5

Ans 4:

Class : Class 8

Ans 5:

Class : Class 4

Ans 6:

Class : Class 5
person should bend forward...wrong answer

Ans 7:

Class : Class 5
person should bend head slightly forward to not let the blood go through 6he throat. Even book is saying that. Answer Cis very wrong

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 7
B

Ans 2:

Class : Class 7

Ans 3:

Class : Class 3
B

Ans 4:

Class : Class 3
B

Ans 5:

Class : Class 9
C

Ans 6:

Class : Class 3
A

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
A is correct . Check on google

Ans 2:

Class : Class 9
I think the relationship is ( Kharif Crop: Kharif Crop ). Then, option A cannot be correct as Barley is a Rabi crop while Maize is a Kharif crop.

Ans 3:

Class : Class 9

Ans 4:

Class : Class 6

Ans 5:

Class : Class 6

Ans 6:

Class : Class 9
I think the relationship is Kharif Crop: Kharif Crop. Then, option A cannot be correct as Barley is a Rabi crop while Maize is a Kharif crop.

Ans 7:

Class : Class 3
The answer is correct. The relation is rabi : kharif .

Ans 8:

Class : Class 6
The relationship is Rabi:Kharif

Ans 9:

Class : Class 5
The relationship is Rabi crop: kharif crop.

Ans 10:

Class : Class 7

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3

Ans 2:

Class : Class 8
both B

Ans 3:

Class : Class 9
B & D

Ans 4:

Class : Class 8
why did not you send right answer clarification or correct options

Ans 5:

Class : Class 3
D is incorrect.But B is also incorrect as both kerosene and syrup are liquid.

Ans 6:

Class : Class 2
both B and D are incorrect

Ans 7:

Class : Class 9
B and D both are incorrect.

Ans 8:

Class : Class 3
B & D

Ans 9:

Class : Class 3
B & D

Ans 10:

Class : Class 3
B and D are incorrect

Ans 11:

Class : Class 8
B

Ans 12:

Class : Class 5
Syrup is not a gas.

Ans 13:

Class : Class 6

Ans 14:

Class : Class 5
B

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 9
A

Ans 2:

Class : Class 2
Crecent to Newmoon to Crecent to Full Moon. Answer is A

Ans 3:

Class : Class 8
Answer is A

Ans 4:

Class : Class 3
A

Ans 5:

Class : Class 5
Huh i got it wrong . it was v easy

Ans 6:

Class : Class 5
answer is A not B

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Subject :NSO    Class : Class 6

A matchbox containing an unknown object is placed on a thin sheet of glass in the experimental set-up shown in the figure.

When the bar magnet moves, it is able to drag the match box along. What is most likely to be found in the matchbox?

A Marble
B Toothpick
C Ten-cent coin
D Steel ball bearing


the match box should certainly contain something magnetic as, when the bar magnet is moved then the match box is also dragged along with it .

Ans 1:

Class : Class 6
Steel is not a magnetic material

Ans 2:

Class : Class 8
steel ball bearing is a conducter that is why it is able to drag the box with it.

Ans 3:

Class : Class 8
Yes it is... yet a steel ball bearing is the best option

Ans 4:

Class : Class 9

Ans 5:

Class : Class 6
guys isnt the iron nail not magnetic it shouldn't" have poles in the first place its like saying a coin is a magnet

Ans 6:

Class : Class 9
Yes steel ball bearing is the best option ....... but i think ten cent coin is also magnetic ... but let it be option A {STEEL BALL BEARING}

Ans 7:

Class : Class 7
Isn't a ten-cent coin also magnetic?

Ans 8:

Class : Class 9
Ya Sharmi is correct, ten-cent coin is also always magnetic

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