National Science Olympiad Forum By SOF Olympiad Trainer - Page 589

User Forum

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 6
B) 2 and 3

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Class : Class 1

Mass is the amount of matter present in an object whereas weight is the force exerted by the gravity on that object.

Now, the weight of an object, W = g X m, where 'g' is Earth's gravitational constant and 'm' is the mass of the object.

The weight of the object will remain constant as long as the mass of that object is not changing since 'g' is constant. However, the weight of an object can still be changed without changing the mass. This can be explained by the following example: Consider a helicopter with a mass, 'm'.

1. If the helicopter is accelerated towards the earth (during landing) with an acceleration equals to 'A' (positive acceleration) then its weight would become, W = (g + A) X m,  and hence, the weight would increase.

2.  If the helicopter is accelerated away from the earth (during take-off) with an acceleration equals to '- A' (negative acceleration) then its weight would become, W = (g - A) X m,  and hence, the weight would decrease.


Post Your Answer

Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Class : Class 1

Mass is the amount of matter present in an object whereas weight is the force exerted by the gravity on that object.

Now, the weight of an object, W = g X m, where 'g' is Earth's gravitational constant and 'm' is the mass of the object.

The weight of the object will remain constant as long as the mass of that object is not changing since 'g' is constant. However, the weight of an object can still be changed without changing the mass. This can be explained by the following example: Consider a helicopter with a mass, 'm'.

1. If the helicopter is accelerated towards the earth (during landing) with an acceleration equals to 'A' (positive acceleration) then its weight would become, W = (g + A) X m,  and hence, the weight would increase.

2.  If the helicopter is accelerated away from the earth (during take-off) with an acceleration equals to '- A' (negative acceleration) then its weight would become, W = (g - A) X m,  and hence, the weight would decrease.


Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
mechanical,kinetic (c)

Ans 2:

Class : Class 5

Ans 3:

Class : Class 7
Mechanical into kinetic energy.

Ans 4:

Class : Class 5
mechanical into kinectic

Ans 5:

Class : Class 5
c

Ans 6:

Class : Class 6
C.Mechanical, Kinetic

Ans 7:

Class : Class 1
Wanna explain why?

Ans 8:

Class : Class 5
c

Ans 9:

Class : Class 5
actually it is written wrong

Ans 10:

Class : Class 5
Its option (c), mechanical into kinetic

Ans 11:

Class : Class 9
Mechanical,kinetic

Ans 12:

Class : Class 5
c

Ans 13:

Class : Class 5
Hey, anyone wants to explain to me why it is option C?

Ans 14:

Class : Class 6
In the options, it is written wrong because it is mechanical , kinetic energy. Instead of that it should be muscular, kinetic energy

Post Your Answer

Subject :NSO    Class : Class 2

Ans 1:

Class : Class 6

Ans 2:

Class : Class 1
The correct answer is d.

Ans 3:

Class : Class 3
Mahi from Icon School Of Excellence, BengaluruClass:2D;none of these

Ans 4:

Class : Class 5
D;none of these

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

Class : Class 1

The correct answer is A.


Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 9

Ans 2:

Class : Class 7
Correct is c because rhino does not have scales while others do

Ans 3:

Class : Class 5
I chose snake too, so Biju Pappachan and Arumolzhi Ramesh, I have the same thought process- it sheds its skin.

Ans 4:

Class : Class 9
The correct answer is CRhinoceros does not have scales on body while snake, lizard and fish have scales as body covering

Ans 5:

Class : Class 5
I ticked the answer as D because fish have gills but the others dont

Ans 6:

Class : Class 8
Snake, lizard and fish have scales as body covering while rhinoceros doesn't. Hence the correct answer is C

Ans 7:

Class : Class 9
The correct answer is CRhinoceros does not have scales on body

Ans 8:

Class : Class 5
The correct answer is CRhinoceros doesn't have scales on their body while snake, lizard and fish have scales as body coveing

Ans 9:

Class : Class 5
Ans is C

Ans 10:

Class : Class 1
Only this question I got wrong

Ans 11:

Class : Class 1
Honestly, if you ask me,I chose snake as the answer because they can peel of their skin while the others can’t. So,Arumolzhi Ramesh I was thinking the same thing. But SOF and most of you guys say that the correct answer is C Rhinoceros as they do not have scales while the other three do. So it must be correct although I did not know lizards had scales on their bodies but as a matter of fact, they do so C must be the correct answer.

Ans 12:

Class : Class 9
Snakes can peel their skin of while the others can’t

Ans 13:

Class : Class 1
Google says lizards have scales.

Ans 14:

Class : Class 4
Do lizards really have scales? I don't think so.

Ans 15: (Master Answer)

Class : Class 1

The correct answer is C.

Rhinoceros does not have scales on body while snake, lizard and fish have scales as body covering.


Post Your Answer

Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1
To get a complete range of Olympiad Preparation Products (including previous years papers) log on to WWW.mtg.in, content partner for SOF Olympiads. For more details visit our website- details available on www.sofworld.org

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 1

Ans 2:

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

Ans 3:

Class : Class 7
GIMME GIMME THE ANS

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

Ans 6:

Class : Class 7

Ans 7:

Class : Class 7
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 8:

Class : Class 7
the ans is b

Ans 9:

Class : Class 9
I agree with ARUNAV

Ans 10:

Class : Class 8
ans is b

Ans 11:

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 12:

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

Ans 13: (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.

Post Your Answer

Subject :NSO    Class : Class 10

Ans 1:

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

Ans 2: (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.

Post Your Answer