National Science Olympiad Forum By SOF Olympiad Trainer

# User Forum

Subject :NSO    Class : Class 3

Class : Class 4
B) 2 and 3

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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.

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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.

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Subject :NSO    Class : Class 5

## Ans 1:

Class : Class 4
Mechanical,kinetic

Class : Class 5
c

## Ans 3:

Class : Class 5
mechanical,kinetic (c)

## Ans 4:

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

Class : Class 5
c

## Ans 6:

Class : Class 5
mechanical into kinectic

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Subject :NSO    Class : Class 2

## Ans 1:

Class : Class 1
The correct answer is d.

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Subject :NSO    Class : Class 5

## Ans 1: (Master Answer)

Class : Class 1

The correct answer is A.

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Subject :NSO    Class : Class 5

## Ans 1:

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

## Ans 2:

Class : Class 5
The correct answer is CRhinoceros does not have scales on body

## Ans 3: (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.

## Ans 4:

Class : Class 5
The correct answer is CRhinoceros does not have scales on body while snake, lizard and fish have scales as body covering

Class : Class 4

## Ans 6:

Class : Class 4
Snakes can peel their skin of while the others canât

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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

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Subject :NSO    Class : Class 6

Class : Class 6
the ans is b

## Ans 2: (Master Answer)

Class : Class 1
The backbone or the vertebral column is a long, bony, rodâ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 3:

Class : Class 7
The backbone or the vertebral column is a long, bony, rodâ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 7
amoeba divides itself it does not lay eggs. they all lACK A BACKBONE

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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