Explanation

Kalology is the study of beauty and the ways in which beauty influences society. 

Kalology means حسن اور جمالیات کا مطالعہ

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Explanation

When the velocity-time graph is a straight line parallel to the time axis then its acceleration is zero.

This is because velocity is constant w.r.t time ie., the change in velocity is zero.

Hence, the acceleration is also zero.

Explanation

 Lenz's law is a consequence of the law of conservation of energy. 

Lenz's law states that the induced current in a conductor always opposes the change in magnetic flux that caused it, which is essentially a way of ensuring that energy is conserved. 

Explanation

Cosmic rays are high-energy particles, primarily protons and atomic nuclei, that travel through space at nearly the speed of light.

They originate from sources like supernovae and other cosmic events and can reach Earth from outside the solar system.

Explanation

The stratosphere prevents UV rays from coming surface of the Earth

90% of the ozone in the atmosphere is occupied by the Stratosphere.

Ozone molecules are constantly formed and destroyed in the stratosphere

Additional Information

Ozone is a molecule that contains three oxygen atoms

The atmosphere can be divided into five layers:

1. Troposphere (all weather occurs within this layer)
2. Stratosphere (ozone layer absorbs UV rays)
3. Mesosphere (coldest layer of the atmosphere)
4. Thermosphere (radiowaves transmitted from the Earth and reflected by this layer)
5. Exosphere (molecules and atoms escape)

Explanation

Extinct:

(of a species, family, or another group of animals or plants) having no living members; no longer in existence

ND17-1-2023

Explanation

Graphite is used for making the electrode in a dry cell.

Graphite is a good conductor of electricity, in fact, as good as metals

Graphite is used as an electrode because it conducts electricity without taking part in the chemical reaction

ND5.3.2023

Explanation

• While playing football two players hits each other and one of them got his leg fractured. Transport to Hospital will be your action as a first aid provider
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the first aid management of fracture at the site of the accident:

• Apply pressure to the wound with a sterile bandage,
• a clean cloth,
• or a clean piece of clothing.
• Immobilize the injured area.
• Don't try to realign the bone or push a bone that's sticking out back in.

• ******

  ND11-12-2022

Explanation

Amphoteric nature​​ Aluminium oxide is an amphoteric substance, meaning it can react with both acids and bases

It is a chemical compound of aluminium and oxygen with the chemical formula Al2O3.

Explanation

According to Graham’s Law of Diffusion, gases with lower molar mass diffuse faster.

Molar masses:

- H₂ = 2 g/mol (lowest)

- He = 4 g/mol  

- N₂ = 28 g/mol  

- CO₂ = 44 g/mol  

Since H₂ has the smallest molar mass, it will diffuse the fastest and thus escape in the least time.