Explanation

Explanation

Climate change leads to more frequent and intense floods, droughts, heatwaves, and glacial melting in Pakistan.

These events severely impact agriculture, water resources, and human health.

It posing a major threat to the country’s economy and livelihoods.

Explanation

Marble is a type of metamorphic rock formed when limestone is subjected to heat and pressure.

It is commonly used in building and decoration due to its strength and appearance.

Explanation

Pressure = Force ÷ Area, which means it measures how much force is applied over a specific surface.

It is commonly measured in Pascals (Pa) where 1 Pa = 1 Newton/m².

Explanation

A systematic error occurs due to flaws in the measuring instrument or method, causing consistent deviation.

It can be corrected by calibration or proper maintenance of equipment.

Explanation

Sulfuric acid (H₂SO₄) is called the "King of Chemicals" or "King of Compounds" due to its wide use in industries like fertilizers, batteries, and detergents.

It plays a key role in chemical manufacturing.

It is often used to measure a country's industrial strength.

Explanation

Anode: The electrode where oxidation (loss of electrons) occurs.

It releases electrons into the circuit.

Cathode vs. Anode:

Cathode: Reduction (gain of electrons) occurs here.

Anode: Always the site of oxidation in both galvanic (voltaic) and electrolytic cells.

Explanation

The symbol ⁴₂He indicates helium has 2 protons (atomic number = 2) and mass number = 4.

In a neutral atom, the number of electrons = protons, so helium has 2 electrons.

Explanation

A magnifying glass uses a convex lens to enlarge the appearance of objects.

Convex lenses converge light rays to a focal point, producing a magnified image.

Explanation

Decomposers like bacteria and fungi break down dead plants and animals.

This process recycles nutrients back into the soil, supporting new plant growth.