Question

Q4. Answer in one word (10)
1.
2.
3
4.
Give one example of rectilinear motion
What is the principle of an electric cell?
In which region of Greek magnet is found in the beginning?
Which are two main components of air?
Which type of wasteis put in blue colour dustbin?
From where does the torch bulb get energy?
5.​

Answer 1

1.Electric elevators used in public places

2.An electrical cell is an "electrical power supply". It converts stored chemical energy into electrical potential energy, allowing positive charges to flow from the positive terminal to the negative one through an external circuit. This is called a current.

3.Roughly 4,000 years ago, a Greek shepherd named Magnes is said to have been tending his sheep in a region of northern Greece called Magnesia. He took a step and suddenly found that the nails that held his shoe together and the metal tip of his staff were stuck fast to the rock he was standing on! Intrigued, he began digging and discovered the first recorded lodestone. Lodestones were henceforth known as “magnetite,” probably named after Magnes or Magnesia.

4.Solution:

The main components of air are:

Nitrogen

Oxygen

Composition of air is:

Nitrogen - 78%

Oxygen - 21%

Carbon dioxide - 0.03 %

Inert gases - 0.9%

5.Blue dustbins are meant for disposal of plastic wrappers and non-bioderadable wastes.

6.A torch gets electricity from the cells kept inside it. A torch has two or more cells. The cells in a torch have to be joined correctly. The two cells in a torch are joined like this: The positive terminal of one cell is always kept in contact with the negative terminal of the other cell.

Answer 2

Answer:

1) The use of elevators in public places is an example of rectilinear motion. Gravitational forces acting on objects resulting in free fall is an example of rectilinear motion.

2) 4,000 years ago, a Greek shepherd named Magnes is said to have been tending his sheep in a region of northern Greece called Magnesia. He took a step and suddenly found that the nails that held his shoe together and the metal tip of his staff were stuck fast to the rock he was standing on!

3) Components of Air - Oxygen, Nitrogen, Carbon dioxide, Water Vapour.

4)The blue coloured bin is used for segregating dry or recyclable left over.

5)Cells (battery) are a source of energy for the torch.

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Explanation:

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