Is Matter Around Us Pure ? — Science STD 9 — Question

Which is the quantity determines the loudness of a sound wave?

A person pushing a wall hard is liable to fall back. Which law is related for this?

Mass of one atom of oxygen is:

The structure of nuclear membrane is suitable for:

Acceleration due to gravity (due to the shell) at any point inside the shell is:

Viruses do not show any characteristic of living until they enter a living cell, because of the absence of:

A and B are two objects with masses 6kg and 34kg respectively. Then,

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

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.

A truck covers 40km with an average speed of 80m/h. then it travels an average speed of 40km/h. the average speed of the truck for the total distanced covered is: