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.

Last verified on 13-03-2026

Explanation

• Glucose is a simple sugar (monosaccharide) and a primary source of energy for cells.
• Its chemical formula is C6H12O6.

Additional information:

• Fructose: C6H12O6 (same formula as glucose, different structure)
• Galactose: C6H12O6
• Ribose: C5H10O5
• Deoxyribose: C5H10O4
• Sucrose (disaccharide): C12H22O11

Last verified on 13-03-2026

Explanation

• The ozone layer acts as Earth’s natural sunscreen, protecting life from the sun’s harmful ultraviolet (UV) radiation.
• UV radiation can cause skin cancer, eye damage, and harm to plants and animals.

Additional information:

• Chemical Formula: O₃ (three oxygen atoms)
• Layer Location: Stratosphere, 15–40 km above Earth
• Function: Absorbs UV-B and UV-C rays from the Sun
• Depletion Causes: Air pollution, CFCs, industrial chemicals
• Protection Measures: Reduce CFC use, ozone-friendly products

Last verified on 09-03-2026

Explanation

• Excited means very happy, enthusiastic, or emotionally stimulated.
• Uninterested and cold shows lack of enthusiasm or emotion, which is the opposite of excited.

• Excited means بہت خوش، پرجوش، یا جذباتی طور پر محرک
• Uninterested and cold means جوش یا جذبات کی کمی کو ظاہر کرتا ہے۔

Last verified on 08-03-2026

Explanation

• Superscript raises the text slightly above the normal line, often used for exponents, footnotes, or ordinal numbers.
• Shortcut in MS Word: Ctrl + Shift + =
• Example: x² (2 is superscript)

Additional information:

• Subscript: Ctrl + = (text goes below the line)
• Bold: Ctrl + B
• Italic: Ctrl + I
• Underline: Ctrl + U

Last verified on 06-03-2026

Explanation

Prophet Muhammad belonged to the Banu Hashim (Hashimite) clan

Named after his great-grandfather, Hashim ibn Abd Manaf, this clan was part of the Adnani Quraish. 

Tribe: Quraysh

Parents: Abdullah ibn Abd al-Muttalib and Aminah bint Wahb

NOTE:The Banu Hashim held a prestigious position in Mecca, often responsible for providing water to pilgrims at the Kaaba. 

Last updated 18-02-2026

Explanation

CPU speed is primarily measured in Hertz (Hz), and Gigahertz (GHz) for modern processors

The fundamental unit is Hertz (Hz), where 1 Hz = 1 cycle per second.

Modern Units: Most, if not all, modern processors use Gigahertz (GHz), where  1 GHz = 10^9 Hz (one billion cycles per second).

Context: It is often referred to as the "clock speed" or "clock rate" of the CPU.

Mbps measures internet speed.

Mbytes measure data size.

Last updated 15-feb-2026

Explanation

• Pressure is a fundamental physical quantity that is defined as the force exerted per unit area.
• It is a measure of the strength of a force acting on a surface.
• It is typically measured in units such as Pascals (Pa) or pounds per square inch (PSI).

Last verified on 10-02-2026

Explanation

In inverse proportion, when one quantity increases, the other decreases in the same ratio.

Their product remains constant: x × y = constant.

Last verified on 09-02-2026

Explanation

Rock salt is also known as halite.

It is the mineral form of sodium chloride (NaCl)

It is commonly used for de-icing roads and as table salt in cooking.