Force and Laws of Motion — Science STD 9 — Question

Cereals largely fulfils which of the following energy requirement?

Which property of colloids is not dependent on the charge on colloidal particles:

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

1. Increasing pressure on hydrogen contained in a closed container.
2. Some hydrogen gas leaking out of the container.
3. Increasing the volume of the container of hydrogen gas.
4. Adding more hydrogen gas to the container without increasing the volume of the container.

1. (i) and (ii)
2. (i) and (iv)
3. (ii) and (iii)
4. (ii) and (iv)

When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:

1. Air is heavier than bromine.
2. Both air and bromine have the same density.
3. Bromine is heavier than air.
4. Bromine cannot be heavier than air because it is going upwards against gravity.

Energy can be defined as:

If an object remains stationary even when force is applied then:

Manures and fertilizers are used to ensure:

Watt hour represents:

Plasmolysis in a plant cell is defined as: