Explanation

• A velocity–time graph shows how velocity changes with time.
• The slope gives acceleration.
• The area under the graph represents motion covered.
• It connects velocity with displacement.

Last verified on 22-05-2026

Explanation

• The speed of sound is generally maximum in solids.
• Because their particles are closely packed and elastic forces transmit vibrations rapidly.

Additional information:

• Solids: Sound generally travels fastest, e.g., Steel: 5,000–6,000 m/s
• Liquids: Sound travels slower than in most solids, e.g., Water: 1,480 m/s
• Gases: Sound travels slowest under ordinary conditions, e.g., Air at 20°C: 343 m/s

Last verified on 15-10-2026

Explanation

• Sir James Chadwick discovered the neutron in 1932.
• He was a British physicist.
• His discovery completed the basic picture of the atomic nucleus.
• He received the Nobel Prize in Physics in 1935 for this discovery.

Additional information:

• J. J. Thomson – Electron (1897)
• Ernest Rutherford – Atomic nucleus (1911) and Proton (1917)

Last verified on 03-07-2026

Explanation

• Smallest bone: Stapes.
• Location: Middle ear.
• Three ear bones: Malleus, Incus, Stapes.

Additional information:

• Longest bone: Femur (thigh bone).
• Adult human skeleton: Usually 206 bones.
• Newborn: About 300 bones at birth; many later fuse together.
• Human skull: 22 bones (8 cranial + 14 facial)

Last verified on 03-09-2026

Explanation

• Diffusion is the natural movement of particles from an area of higher concentration to lower concentration without external force.
• It occurs in gases, liquids, and even solids to some extent.

Last verified on 14-10-2026

Explanation

• Mitochondria are called the powerhouse of the cell.
• Because they produce Adenosine Triphosphate (ATP).
• ATP is the energy currency of the cell.
• ATP provides energy for different cellular activities such as movement, growth, and transport.
• Energy is produced through aerobic cellular respiration using oxygen and الغذائی molecules.
• They are found in the cytoplasm of most eukaryotic cells.
• Richard Altmann first described mitochondria in 1890.

Main Parts of a Cell:

1. Cell membrane → Outer protective layer
2. Nucleus → Controls cell activities
3. Cytoplasm → Jelly-like material between membrane and nucleus

Last verified on 09-05-2026

Explanation

• Earth is called the Blue Planet.
• About 71% of Earth's surface is covered by water.
• Water makes Earth appear blue from space.
• Earth is the third planet from the Sun.
• Earth’s natural satellite is the Moon

Last updated: NA on 26-09-2026

Explanation

• SARS-CoV-2: Coronavirus that causes COVID-19.
• First identified: Late 2019.
• Transmission: Mainly through respiratory particles.
• COVID-19: Stands for Coronavirus Disease 2019.

Explanation

• Genetics: Study of heredity and variation in organisms.
• An Austrian monk who experimented with pea plants in the 19th century is known as the "Father of Modern Genetics"

Additional information

• Ecology: Study of organisms and their environment.
• Anatomy: Study of the structure of organisms.
• Evolution: Study of how living organisms change over generations.

Explanation

• The Theory of Relativity was proposed by Albert Einstein.
• It was introduced in the early 20th century.
• It includes Special Relativity (1905) and General Relativity (1915).
• The theory explains the relationship between space, time, and gravity.

Last verified on 02-04-2026