Explanation

Boiling an egg involves a chemical change.

Because it alters the egg’s proteins, changing its structure and making it solidify.

Explanation

The ozone layer exists about 30 km above the Earth's surface.

It is located in the stratosphere.

It plays a crucial role in blocking harmful ultraviolet radiation from the Sun.

Explanation

65% of the human body is oxygen.

Oxygen is a major component of water.

It makes up a significant portion of body mass.

Explanation

Science is typically divided into four main categories:

1. Natural Sciences: Focus on the physical world and its phenomena.
2. Formal Sciences: Concerned with abstract systems and logical reasoning.
3. Social Sciences: Explore human behavior and societal structures.
4. Applied Sciences: Use scientific principles to solve practical problems and develop technology.

Explanation

Human blood is divided into 4 main groups:

1. A
2. B
3. AB
4. O

These groups are determined by the presence or absence of specific antigens on the surface of red blood cells.

Explanation

Hemodialysis is a treatment for kidney failure.

It involves filtering blood outside the body to remove waste.

Explanation

Amino Acids are the products of protein digestion.

Proteins are broken down into amino acids by enzymes.

They are then absorbed and utilized by the body.

Explanation

1 calorie = 4.2 joules (exact value is 4.184 J), so 1000 cal = 4184 J.

1 kilocalorie (kcal) = 4184 joules, commonly used in food energy.

Explanation

Oil and gas are not renewable energy sources. 

They are fossil fuels that deplete over time and take millions of years to form.

The renewable energy sources are:

• Water energy
• Wind energy
• Tidal energy
• Hydroelectric
• Ocean energy
• Geothermal energy
• Biomass
• Biogas

The non-renewable energy sources are:

• Fossil fuels or Hydrocarbon fuel (Oil, Natural gas, Coal)
• Nuclear energy

Explanation

The recent economic plan between China and Pakistan is CPEC (China-Pakistan Economic Corridor).

It was launched on April 20, 2015, with a $46 billion value.

It is a major infrastructure project aimed at enhancing connectivity and economic cooperation between China and Pakistan.

It serves as a framework for regional connectivity and economic rationalization in a globalized world.