National Science Olympiad Forum By SOF Olympiad Trainer - Page 590

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Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Class : Class 1
The backbone or the vertebral column is a long, bony, rod–like structure, which extends from the base of the skull to the lower back. The animals which possess the backbone are called vertebrates and the ones which do not possess it are called invertebrates. Ant, spider, octopus, amoeba and starfish, are all invertebrates.So, the answer is B. Amoeba does not lay eggs. It is an unicellular organism which divide by binary fission.

Ans 2:

Class : Class 9
amoeba divides itself it does not lay eggs. they all lACK A BACKBONE

Ans 3:

Class : Class 9
The backbone or the vertebral column is a long, bony, rod–like structure, which extends from the base of the skull to the lower back. The animals which possess the backbone are called vertebrates and the ones which do not possess it are called invertebrates. Ant, spider, octopus, amoeba and starfish, are all invertebrates.So, the answer is B. Amoeba does not lay eggs. It is an unicellular organism which divide by binary fission.

Ans 4:

Class : Class 6
i agree with AYAAN VOHRA the admin is useless and the question is:which of the following is an example of incomplete flower?A) mulberryB) peaC) mustardD) hibiscusi chose (B) but sof said it's(A) and when i checked solutions it said" ." so I searched the forum but everyone(including the"admin")are talking about animals and amoeba.SOF PLS HELP!!!!!!!!!!!!

Ans 5:

Class : Class 8
ans is b

Ans 6:

Class : Class 7

Ans 7:

Class : Class 8
GIMME GIMME THE ANS

Ans 8:

Class : Class 10
admin , who are you ? why you do not tell your real name ?

Ans 9:

Class : Class 8
why is everyone talking about animals?! I got a question about plants specifically complete and incomplete flowers. SOF PLEASE HELP ME HELP ME!!!!!!!!! AND THAT ADMIN IS COMPLETELY USELESS

Ans 10:

Class : Class 9
I agree with ARUNAV

Ans 11:

Class : Class 6
AND THE ANSWER IS AND THE ANSWER IS (A) MULLBERRY as the other three have all the four whorls

Ans 12:

Class : Class 7
the ans is b

Ans 13:

Class : Class 1

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Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

Class : Class 1
Here, the answer is D. Black residue is obtained in test tubes I and III i.e., iron gets displaced in test tubes I and III. Therefore, metals P and R should be more reactive than iron. No change is observed in test tubes II and IV hence, metals Q and S should be less reactive than iron.

Ans 2:

Class : Class 5
Since the residue obtained was black in colour and we know that only Zinc and Copper on reacting with Iron give a black residue hence the answer is Option D

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Subject :NSO    Class : Class 10

Ans 1:

Class : Class 5
Option D

Ans 2: (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.

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 8
iub9u-jinjbh p8huuhikitmujipy ijogijodigdj;' h/mhykfcx

Ans 2:

Class : Class 8

Ans 3:

Class : Class 7
bbbbbbbbbbbbbbbbbbbbbbBBBBBBBBBBBBBBBBBBBBbbbbbbbbbbbb

Ans 4:

Class : Class 5

Ans 5:

Class : Class 10
By why not (C)?

Ans 6:

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

Ans 7:

Class : Class 3

Ans 8:

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.

Ans 9:

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

Ans 10:

Class : Class 5
bruh

Ans 11: (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 12:

Class : Class 9

Ans 13:

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

Ans 14:

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

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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 6
correct answer is C

Ans 2:

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

Ans 3:

Class : Class 7
to my knowledge the ans is c

Ans 4:

Class : Class 7
to my knowledge the ans is c

Ans 5:

Class : Class 9
c

Ans 6:

Class : Class 6

Ans 7:

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 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 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 10:

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 11:

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

Ans 12:

Class : Class 9
c

Ans 13:

Class : Class 8
option c

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Subject :NSO    Class : Class 4

Ans 1:

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

Ans 2:

Class : Class 5

Ans 3:

Class : Class 5
class 4

Ans 4:

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 5: (Master Answer)

Class : Class 1
Kindly mention your query

Ans 6:

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 7:

Class : Class 4

Ans 8:

Class : Class 5

Ans 9:

Class : Class 4

Ans 10:

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

Ans 11:

Class : Class 4
ans is b

Ans 12:

Class : Class 4
The answer has to be D.

Ans 13:

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

Ans 14:

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 15:

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

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