When hard water is evaporated completely,the white solid remains in the container.It may be sue to the presence of
1.Carbonates of Ca and Mg.
2.Sulphates of Ca and Mg
3.Chlorides of Ca and Mg
The earth without rotational motion would result into
1.no sunrise and no sunset
2.no occurence of day and night cycle.
3.only one season
In an observation,α-particles,β particles and γ particles have the same energy.Their penetrating power in a given medium in increasing order is
Statement I:
When a gun is fired,it recoils,ie it pushes back,with much less velocity than velocity of gun
Statement II:
Velocity of recoiling gun is less because gun is much heavier than bullet
Siderreal day is shorter than solar day
Statement II
The motion of the earth in its orbit around the sun is called revolution
Tides are the rise and fall of sea levels caused by the gravitational forces exerted by the moon,sun and the rotation of the earth.
Eart rotates from west to east once in 24 hours with respect to sun