Explanation

• The SI unit of energy is the Joule (J).
• It is the unit of energy, work, and heat.

Additional information:

• 1 Joule (J) = 1 Newton × 1 meter
• Calorie – 1 cal = 4.184 J
• Kilowatt-hour (kWh) – 1 kWh = 3.6 × 10⁶ J
• Electronvolt (eV) – 1 eV ≈ 1.602 × 10⁻¹⁹ J
• Erg (CGS unit) – 1 erg = 10⁻⁷ J

Last verified on 17-01-2026

Explanation

• Diamond is a naturally occurring allotropic form of carbon.
  • Allotropy means a single element can exist in more than one form with different structures and properties.
  • It is extremely hard.
  • It has a high melting point.
  • It is widely used in jewelry and cutting tools.

Additional information:

• Graphite – soft, good conductor
• Fullerenes (C60) – spherical molecules
• Carbon nanotubes – tubular, high strength
• Amorphous carbon – coal, soot
• Lonsdaleite – hexagonal diamond

Last verified on 17-01-2026

Explanation

Abolish means ختم کردینا

Do away with means کے ساتھ دور کرو

Nullify means مسترد کرنا

End means ختم

Explanation

A fission reaction is a chemical reaction in which an atomic nucleus splits into smaller parts, releasing energy.

It typically occurs in nuclear reactors and atomic bombs.

Explanation

Curse means لعنت

Malediction means بدکاری

Evil means برائی

Explanation

The nephron is the structural and functional unit of the kidney.

Renal Corpuscle:

This is the initial filtering unit. 

Glomerulus:

A network of tiny blood vessels that filters blood, allowing small molecules, waste, and fluid to pass into the tubule. 

Bowman's Capsule:

A cup-shaped structure that surrounds the glomerulus and collects the filtered fluid. 

Renal Tubule:

An epithelial tube extending from the Bowman's capsule where reabsorption and secretion occur. 

How it Works 

Filtration:

Blood enters the glomerulus, where its smaller components are filtered into the Bowman's capsule.

Reabsorption:

As the filtered fluid moves through the renal tubule, essential substances (water, minerals, nutrients) are reabsorbed into the bloodstream.

Waste Concentration:

The remaining fluid, now concentrated with wastes and excess water, becomes urine.

Explanation

As this diagram shows, pH ranges from 0 to 14, with 7 being neutral.

pH less than 7 are acidic.

pH greater than 7 are alkaline.

Explanation

An atomic bomb is based on the nuclear reaction known as nuclear fission,

A heavy atomic nucleus splits into two or more lighter nuclei, releasing a large amount of energy in an uncontrolled chain reaction.

The bombs dropped on Hiroshima and Nagasaki were examples of nuclear fission bombs, utilizing uranium-235 or plutonium-239 as the fissionable material. 

Explanation

"Combustion of methane" is an example of an exothermic reaction. 

Photosynthesis:

This is an endothermic reaction, meaning it absorbs energy from sunlight to produce glucose. 

Decomposition of calcium carbonate:

This is also an endothermic reaction, as it requires energy to break down calcium carbonate into calcium oxide and carbon dioxide. 

Electrolysis of water:

This is an endothermic reaction where electricity is used to split water into hydrogen and oxygen. 

Explanation

The oxidation of secondary alcohols produces ketones.

This reaction involves the loss of a hydrogen atom from the hydroxyl (-OH) group and a hydrogen atom from the alpha carbon (the carbon atom bonded to the -OH group),

Forming a double bond between the alpha carbon and the oxygen atom.