National Science Olympiad Forum By SOF Olympiad Trainer

# User Forum

Subject :NSO    Class : Class 8

## Ans 1:

Class : Class 8
All the properties friction are in use. Hence, the correct one option 'D'.

## Ans 2:

Class : Class 8

Subject :NSO    Class : Class 8

## Ans 1: (Master Answer)

Class : Class 1

The correct answer is C.

Subject :NSO    Class : Class 3

## Ans 1:

Class : Class 4
B) 2 and 3

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.

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.

Subject :NSO    Class : Class 5

Class : Class 5
c

Class : Class 5
c

## Ans 3:

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

## Ans 4:

Class : Class 5
mechanical into kinectic

## Ans 5:

Class : Class 5
mechanical,kinetic (c)

## Ans 6:

Class : Class 4
Mechanical,kinetic

Subject :NSO    Class : Class 2

## Ans 1:

Class : Class 1
The correct answer is d.

Subject :NSO    Class : Class 5

## Ans 1: (Master Answer)

Class : Class 1

The correct answer is A.

Subject :NSO    Class : Class 5

## Ans 1: (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.

Class : Class 9

## Ans 3:

Class : Class 9
Snakes can peel their skin of while the others canât

## Ans 4:

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

## Ans 6:

Class : Class 4
The correct answer is CRhinoceros does not have scales on body