Gravitation — Science STD 9 — Question

Atoms react to achieve an octet in the outermost shell. This is achieved by:

Which of the following are also considered to be the states of matter?

1. Plasma.
2. Platelets.
3. BFC.
4. BHC.

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

To solve the food problem of the country, which among the following is necessary?

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.

In a hydro power plant:

Goldstein’s experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:

When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of:

The maximum speed of vibrations which produce audible sound will be in:

1. Dry air.
2. Sea water.
3. Ground glass.
4. Human blood.

All animals are:

'All matter is composed of very small particles called Parmanu' was first suggested by: