Question

helpp plz i will mark as.....​

Answer 1

4.

a) As the question is not visible completely, I can't find the volume. But I can tell you the formula, i.e., Volume,V = l × b × h

b) Without height we can't find volume. And without volume we can't find the density. So here's the formula:  Density = $\frac{Mass}{Volume}$

c) The force that pulls this block downwards is known as Gravity.

5.

a) The Gases represented by the letters are as followed:

1. M = Nitrogen

2. N = Oxygen

3. O = Inert Gases (I have doubt in this)

4. P = Carbon Dioxides

b) Photosynthesis

c) Carbon dioxide extinguishes work by displacing oxygen, or taking away the oxygen element of the fire triangle. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.

6.

Well I have doubt in the Match one.... I'm sorry for this.. Y_Y

Answer 2

I am just going to correct the mistakes of the first user's answer.

5.a) M- Nitrogen

    N- Oxygen

    O- Argon

    P- Carbon dioxide and other gases

  b) Human Breathing(Photosynthesis does not need oxygen but needs Carbon Dioxide)

  c) Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. Oxygen is used to fuel the fire.

6. Rat flea- Plague and not sure abt last two