National Science Olympiad Forum By SOF Olympiad Trainer - Page 641

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Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

Class : Class 1
Here, the answer is D. The method used to extract metals from the ore in which they are found depends on their reactivity. For example, reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide. The metals low in the reactive series are very less reactive. The oxides of such metals can be reduced to metals by heating alone e.g. mercury is obtained from its ore, cinnabar (HgS), by the process of heating. Metals like iron, zinc, lead etc. occur as sulphides or carbonates in nature. First the ore is converted into its oxide form This is done by either roasting or by calcination. The metal oxide is reduced to metal by using suitable reducing agent such as Carbon.

Ans 2:

Class : Class 5
Option D

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Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

Class : Class 1
Here, Option A shows - Dandelion which is dispersed by wind Option B shows - Lotus which is dispersed by water Option C shows - Xanthium which is dispersed by animals Option D shows - Pea which is dispersed by explosion So, the answer is B.

Ans 2:

Class : Class 7
@Ananjit Chander, Because Xanthium is dispersed by animals, not explosions.

Ans 3:

Class : Class 5
iub9u-jinjbh p8huuhikitmujipy ijogijodigdj;' h/mhykfcx

Ans 4:

Class : Class 5
bruh

Ans 5:

Class : Class 6

Ans 6:

Class : Class 7
bbbbbbbbbbbbbbbbbbbbbbBBBBBBBBBBBBBBBBBBBBbbbbbbbbbbbb

Ans 7:

Class : Class 3

Ans 8:

Class : Class 4
mine every ans is correct but i obtained only 4/5!

Ans 9:

Class : Class 8

Ans 10:

Class : Class 6
A - Cocklebur : Dispersed by animalB - Hiptage : Dispersed by windC - Dandelion : Dispersed by windD - Coconut : Dispersed by water

Ans 11:

Class : Class 6
C is dispersed by animals not by explosion

Ans 12:

Class : Class 10
By why not (C)?

Ans 13:

Class : Class 9

Ans 14:

Class : Class 5
Option A shows - Dandelion, dispersed by animals B shows- Lotus seeds, dispersed by water C shows- Xanthium , dispersed by explosion And, D shows- Peas, dispersed by wind.Among these, only option B , which is ' lotus seeds, dispersed by water' is correct, therefore option B is the correct answer.

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Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

Class : Class 1
Here, the answer is (d). The right hand rule can be used to determine the direction of the force on a current-carrying wire placed in an external magnetic field.

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Subject :NSO    Class : Class 2

Ans 1: (Master Answer)

Class : Class 1
Kindly mention your query

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Subject :NSO    Class : Class 8
hi

Ans 1: (Master Answer)

Class : Class 1
Kindly mention your query

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 6
THROUGH NERVES WHICH CARRY THE PAIN STIMULUS

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7
to my knowledge the ans is c

Ans 2:

Class : Class 9
c

Ans 3:

Class : Class 9
c

Ans 4:

Class : Class 6
its c as transparent object 1 will allow light ti pass. opaque object 2 wont allow anything to pass and will make a patch of light and the last could be anything

Ans 5:

Class : Class 6
it could be b too as it is not clear that if it has any problem in it like hazy r said if its clear

Ans 6:

Class : Class 8
No, the right answer is opt. c because if II is translucent, then it will NOT GET A CLEAR BRIGHT SPOT but a hazy one.

Ans 7:

Class : Class 6

Ans 8:

Class : Class 8
No, the right answer is opt. c because if II is translucent, then it will NOT GET A CLEAR BRIGHT SPOT but a hazy one.

Ans 9:

Class : Class 6
correct answer is C

Ans 10:

Class : Class 7
to my knowledge the ans is c

Ans 11:

Class : Class 8
option c

Ans 12:

Class : Class 9
SOF I had given C how you show that I gave B???

Ans 13:

Class : Class 9
IF [I] WILL BE TRANSPARENT ,AS WE KNOW THAT THE MATERIALS WHICH ALLOW LIGHT TO PASS THROUGH THEM ARE CALLED TRANSPARENT SO IF WE CUT OUT A SQUARE TRANSPARENT SHEET FROM A ROLL OF TRANSPARENT ,SURELY THE LIGHT PATCH WILL PASS THROUGH[II]THEN THE [II] MATERIAL SHOULD BE SOMETING WHICH CAN NOT ALLOW LIGHT TO PASS TROUGH IT IT SHOULD BE OPAQUE AND THE LAST SQUARE[III] CAN BE MADE OUT FROM ANY MATERIAL,THUS IT WILL NOT CHANGE THE ANSWER.SO WE CONCLUDE THE CORRECT ANSWER IS C

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
The answer can either be B or D.

Ans 2:

Class : Class 5
That answer is D as b,a and b are the best conductors of heat so the heat would pass through b,a and b faster and it is balanced.Nice question.

Ans 3: (Master Answer)

Class : Class 1
Kindly mention your query

Ans 4:

Class : Class 4
The answer has to be D.

Ans 5:

Class : Class 5
class 4

Ans 6:

Class : Class 6
Ishit and Riddhiman thank you for clearing my doubts

Ans 7:

Class : Class 5
Lata hai sab pagal ho gaya hai answer is b

Ans 8:

Class : Class 5

Ans 9:

Class : Class 5
Thanks Again Ishit, Riddhiman, and Avyukt!🙏

Ans 10:

Class : Class 4

Ans 11:

Class : Class 4

Ans 12:

Class : Class 4
there is no necessity of mentioning the words: "descending order". This is contradictory to the statement: A>B>C>D. Hence the question is wrong.

Ans 13:

Class : Class 7
That answer is D as b,a and b are the best conductors of heat so the heat would pass through b,a and b faster and it is balanced.Nice question.

Ans 14:

Class : Class 5

Ans 15:

Class : Class 4
ans is b

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 1
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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 9
My query is, I didn't understand anything. Pls explain me

Ans 2: (Master Answer)

Class : Class 1
Kindly mention your query

Ans 3:

Class : Class 9
ans is b

Ans 4:

Class : Class 8

Ans 5:

Class : Class 8
Please explain how unsaturated fats are liquids at room temperature

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