Explanation

• Density is the mass per unit volume of a substance.
• Density is calculated by dividing the mass of a substance by its volume.
• The SI unit of density is kilogram per cubic metre (kg/m³).

Last verified on 25-10-2026

Explanation

• Electrochemistry is the branch of chemistry that studies the relationship between electrical energy and chemical energy, including their interconversion.
• It deals with electrochemical cells, batteries, electrolysis, and oxidation-reduction (redox) reactions.
• Galvanic cells convert chemical energy into electrical energy.
• Electrolytic cells use electrical energy to drive chemical reactions.

Last verified on 25-10-2026

Explanation

• The Total Fertility Rate (TFR) is the average number of children a woman is expected to have during her reproductive years, based on current age-specific fertility rates.
• It is generally expressed as the number of children per woman.

Additional information:

• The Crude Birth Rate (CBR) measures the number of live births per 1,000 people in a population per year.
• The Dependency Ratio compares the dependent-age population with the working-age population.

Last verified on 23-10-2026

Explanation

• An electron carries a negative electric charge.
• Its charge is approximately −1.602 × 10⁻¹⁹ C.
• A proton has an equal magnitude of positive charge, while a neutron has zero electric charge.
• The charge of an electron is called the elementary charge with a negative sign.

Explanation

• Olericulture is a branch of horticulture.
  • It focuses on the cultivation, growth, and harvesting of vegetables.
  • Helps improve yield, quality, and pest management in vegetables.
  • Important for food supply and nutrition.
  • Examples include tomatoes, carrots, and cabbage.

Last verified on 12-02-2026