# User Forum

Subject :NSO    Class : Class 7

Class : Class 1

Class : Class 7

## Ans 3:

Class : Class 8
The correct answer is B. In 4sec the objet increases its speed to 200m/s . Acceleration=(200-0)Ã·4 = 50m/s^2. S=ut 1/2Ãat^2. Solve it you'll get 400m. a=acceleration(50), t=time(4), u=initial velocity(0) and s is displacement(consider it distance travelled)

## Ans 4:

Class : Class 9
How is it 200m? I am getting 800m.

Subject :NSO    Class : Class 5

## Ans 1:

Class : Class 7

Subject :NSO    Class : Class 8

## Ans 1:

Class : Class 9
sea weed and bird only are in line with the laser. we can see only these.

Subject :NSO    Class : Class 8

## Ans 1:

Class : Class 8
Coal is a fuel with high carbon content derived from destructive distillation of coal.

Subject :NSO    Class : Class 8

## Ans 1:

Class : Class 8
The correct option is D. Because if you see the reactivity table copper is placed below hydrogen.So it is not more reactive than hydrogen and cannot replace it from its compound.

## Ans 2:

Class : Class 6
correct answer is D because in the reactivity series,copper lies below hydrogen which means that hydrogen cannot be displaced by copper from its salt solution.

Subject :NSO    Class : Class 7

Class : Class 1

Subject :NSO    Class : Class 7

## Ans 1:

Class : Class 7
A

Subject :NSO    Class : Class 5

Subject :NSO    Class : Class 5