Explanation

Modern means جدید

Current means موجودہ

Explanation

pOH is defined as the negative logarithm of the hydroxide ion concentration: pOH = -log[OH⁻].

It is used to measure the basicity of a solution, similar to how pH measures acidity.

Explanation

"To" completes the phrase "to the best of his ability".

It means he worked with his maximum effort.

Explanation

Bronchial respiration refers to respiration through gills, mainly seen in fishes.

Gills extract dissolved oxygen from water and expel carbon dioxide.

Explanation

The charges of Proton, Electron, Neutron respectively are:

• Proton: Positive charge (+1)
• Electron: Negative charge (-1)
• Neutron: Neutral charge (0)

Explanation

"Satisfied" is the correct adjective form to describe the state of being content ("I am satisfied").

Satisfied means مطمئن

Explanation

A light microscope can magnify up to 1000x (typical maximum), resolving structures as small as 0.2 micrometers.

This is ~1000x sharper than the naked eye (which resolves ~0.2 mm).

Explanation

Add and Added show a change from present to past tense.

Say and Said also represent present to past tense, matching the same pattern.

Explanation

Nickel is a micronutrient essential for the activity of the enzyme urease, involved in nitrogen metabolism.

It helps in converting urea into usable forms of nitrogen for plants.

Explanation

Carboxylic acids contain the carboxyl group (–COOH), which gives them their acidic properties.

This group consists of a carbonyl (C=O) and hydroxyl (–OH) bonded to the same carbon atom.