Question

C. Very short question answer :-
1. What is Pascal's law ?
2. What is friction ?
3. Why pure gold is not used to make jewellery ?
4. Why are mitochondria called the powerhouse of a cell?
5. Name three types of plastids ?​

Answer 1

Explanation:

1. states that a pressure change at any point in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere

2. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

3. pure gold is very soft and tend to break. therefore gold mixed with small parts of silver or copper is used in making jewellery. because of the softness of the pure gold(24 carat) it is not used for making jewelleries

4. are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell

4. Chloroplasts.

Chromoplasts.

Gerontoplasts.

and Leucoplasts.

hope it helps you

Answer 2

Answer:

1.Pascal's law is a principle in fluid mechanics given by Blaise Pascal that states that a pressure change at any point in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere. The law was established by French mathematician Blaise Pascal in 1647–48. ..

2.Friction is a force between two surfaces that are sliding, or trying to slide, across each other. ... Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down..

5.There are four main types of plastids:

Chloroplasts.

Chromoplasts.

Gerontoplasts.

and Leucoplasts....