Explanation

A semiconductor diode has 2 terminals: anode (positive) and cathode (negative).

It allows current to flow in one direction only, functioning as a rectifier.

Explanation

Taq polymerase is an enzyme obtained from the thermophilic bacterium Thermus aquaticus.

It is heat-stable and essential for PCR, where it replicates DNA at high temperatures.

Explanation

Mica is a dielectric material that increases the capacitance when placed between capacitor plates.

It does so by reducing the electric field and allowing the capacitor to store more charge for a given voltage.

Explanation

The least distance of distinct vision for a normal human eye is 25 cm.

It is the minimum distance at which the eye can see an object clearly without strain.

Explanation

The Tundra ecosystem in Pakistan is found in the high-altitude regions of the Karakoram and Hindukush Mountains.

This ecosystem is characterized by cold climate, permafrost, and low vegetation like mosses and lichens.

Explanation

Afforestation is the process of planting trees in an area where there were no previous forests.

It helps in combating climate change, preventing soil erosion, and improving biodiversity.

Explanation

As we move down Group 17 (halogens), the melting point increases due to greater molecular mass and stronger van der Waals forces.

For example: Fluorine < Chlorine < Bromine < Iodine in melting points.

Explanation

In the five kingdom classification by Whittaker.

All unicellular prokaryotes like bacteria and cyanobacteria are placed in Kingdom Monera.

These organisms lack a true nucleus and membrane-bound organelles, distinguishing them from other kingdoms.

Explanation

Soft iron is most suitable for transformer cores due to its high magnetic permeability and low hysteresis loss.

It allows efficient magnetic flux linkage, improving transformer performance.

Explanation

Archaebacteria, especially thermophiles, can survive extreme conditions, tolerating temperatures up to 120°C.

They are often found in hot springs, hydrothermal vents, and other extreme environments.