Explanation

• The hardest substance in the world is diamond.
• Its hardness is due to the strong covalent bonding between its carbon atoms.
• This making it the most resistant to scratching.

Additional information:

• Category: Native minerals
• Cleavage: 111 (perfect in four directions)
• Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)
• Crystal habit: Octahedral
• Crystal system: Cubic
• Dana classification: 1.3.6.1
• Density: 3.5–3.53 g/cm3 3500–3530 kg/m3

Last verified on 07-06-2026

Explanation

• Photosynthesis produces glucose and oxygen.
• Green plants use sunlight, water, and carbon dioxide.
• This process occurs in chloroplasts using chlorophyll.
• Glucose is used as food for energy and growth.
• Oxygen is released as a byproduct into the atmosphere.

Last verified on 10-03-2026

Explanation

• A stretched spring possesses potential energy.
• When a spring is stretched or compressed, energy is stored in it.
• This stored energy is called elastic potential energy.
• It can be converted into kinetic energy when released.
• The more the stretch, the more energy is stored.

Last verified on 08-06-2026

Explanation

• Thrombocytes (Platelets) help in blood clotting.
• They stop bleeding by forming a clot at the injury site.
• They stick together when a blood vessel is damaged.
• This prevents excess blood loss.
• They are essential for wound healing.

Last verified on 07-06-2026

Explanation

• An electric generator is a device that converts mechanical energy into usable electrical energy.
• This process is based on the principle of electromagnetic induction.
• Discovered in 1831 by British scientist Michael Faraday.

Last verified on 27-04-2026

Explanation

• Apple is rich in iron and dietary fiber.
• Iron helps in blood formation (RBC production).
• Fiber helps in digestion and stomach health.
• Apple also contains vitamins and antioxidants.
• It is a very healthy fruit for daily use.

Last verified on 07-06-2026

Explanation

• The chemical formula for water is H₂O.

Atomic masses:

• Hydrogen (H) = 1 amu each → 2 × 1 = 2 amu
• Oxygen (O) = 16 amu

Total molecular mass = 2 (from H) + 16 (from O) = 18 amu.

Last verified on 07-06-2026

Explanation

• Silica (SiO₂) is the main component of glass.
• It providing its transparency and hardness.
• It forms a network structure when melted, giving glass its solid yet brittle nature.

Last verified on 07-06-2026

Explanation

• Momentum (p = mv): If velocity doubles, momentum also doubles.
• Kinetic Energy (KE = ½mv²): If velocity doubles, KE becomes four times.

Last verified on 07-06-2026

Explanation

• The law that states mass can neither be created nor destroyed is the Law of Conservation of Mass.
• This law states that mass remains constant in a chemical reaction.
• Matter cannot be created or destroyed, only transformed.

Last verified on 02-04-2026