Explanation

• Violet light has the smallest wavelength, approximately 380-450 nanometers (nm).
• While red light has the longest wavelength, approximately 620-750 nanometers (nm).
• The order of colors in the spectrum, from longest to shortest wavelength, is: Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROYGBIV).

Last verified on 01-04-2026

Explanation

• Total planets: 8
• Inner planets: Mercury, Venus, Earth, Mars (4)
• Outer planets: Jupiter, Saturn, Uranus, Neptune (4)
• Pluto reclassified: 2006 (IAU decision)
• Largest planet: Jupiter
• Smallest planet: Mercury

Last verified on 01-04-2026

Explanation

• The scientific study of different aspects of plants is called botany.
• Plant biology or Phytology, is the science of plant life and a branch of biology.

Additional information:

• Study of soil is called Pedology
• Study of grasses is called Agrostology
• Study of food is called Bromatology
• Study of cells is called Cytology
• Study of animals is called Zoology
• Study of skin is called Dermatology
• Study of insects is called Entomology
• Study of eggs is called Oology
• Study of earthquakes is called Seismology
• Study of viruses is called Virology
• Study of bacteria is called Bacteriology
• Study of the heart is called Cardiology 
• Study of fermentation is called Zymology

Last verified on 31-03-2026

Explanation

• Alexander Graham Bell is credited as the inventor of the telephone.
• He was awarded the first successful patent for it.
• The telephone was invented in 1876.
• Bell made the first-ever telephone call to his assistant Thomas Watson.

Last verified on 31-03-2026

Explanation

• Calcium phosphate, specifically hydroxyapatite, is the main component of bones and teeth.
• It is a calcium salt of phosphoric acid.
• It is the primary mineral constituent of bone tissue, making up about 70-80% of bone dry weight.
• Calcium phosphate gives bones and teeth their strength and rigidity.

Last verified on 31-03-2026

Explanation

• The cheapest source of electricity generation is Solar Energy.
• Solar energy uses sunlight, which is free and renewable.
• Costs have dropped significantly due to modern solar panel technology.
• It avoids fuel costs and environmental pollution.

Last verified on 31-03-2026

Explanation

• Diseases can be caused by bacteria, viruses, or other pathogens.
• Flu (Influenza) and Jaundice (Hepatitis A, B, or C) are caused by viruses.
• Typhoid and Cholera are caused by bacteria.
• Therefore, Typhoid and Cholera are not viral diseases.

Last verified on 31-03-2026

Explanation

• Hepatitis A spreads mainly through contaminated water or food.
• Common in areas with poor sanitation.
• It is a fecal-oral transmission disease.

Last verified on 31-03-2026

Explanation

• Hepatitis A is primarily spread through the fecal-oral route, often via consumption of contaminated food or water.
• It can be prevented by maintaining good hygiene, ensuring safe drinking water, and vaccination.

Last verified on 31-03-2026

Explanation

• Rainfall is measured using a Rain Gauge.
• It collects rainwater and measures it in millimeters (mm).
• Widely used in weather forecasting and meteorology.
• Helps in studying climate and agriculture patterns.

Last verified on 31-03-2026