Explanation

• The diaphragm of a microscope controls the amount of light passing through the specimen.
• In humans, the iris regulates the amount of light entering the eye through the pupil.

Additional information:

• Eyepiece → Lens of eye (focuses image)
• Stage → Retina (holds specimen/image for observation)
• Light source → Pupil (allows light to enter)
• Objective lens → Cornea & Lens (magnifies object)

Last verified on 13-03-2026

Explanation

• Remote Sensing is the science of collecting information about the Earth’s surface without direct contact.
• It is mainly done using satellites equipped with special sensors and cameras in space.
• These satellites capture images and data used for mapping, weather forecasting, and environmental monitoring.

Last verified on 12-03-2026

Explanation

• Wind energy is a form of kinetic energy produced by the movement of air.
• This moving air rotates the blades of wind turbines or fans to generate electricity.
• Wind power is an important renewable and clean energy source.

Last verified on 12-03-2026

Explanation

• Meteorologists are scientists who study the atmosphere and weather conditions.
• They forecast tornadoes, hurricanes, floods, and other weather events using satellites, radar, and computer models.
• Their work helps in early warning systems and disaster management.

Last verified on 12-03-2026

Explanation

• Wavelength is the distance between two successive crests or two successive troughs in a transverse wave.
• It represents one complete cycle of a wave.

Additional information:

• Symbol used: λ (Lambda)
• SI unit: meter (m)
• Wave formula: v = fλ
• Example wavelength values: 1 m, 0.5 m, 10 cm, 500 nm, 700 nm
• Visible light wavelength range: ~400 nm – 700 nm

Last verified on 12-03-2026

Explanation

• Meiosis is a special type of cell division that produces four daughter cells from one parent cell.
• These cells are haploid (n), meaning they contain half the number of chromosomes.
• Meiosis is essential for sexual reproduction and genetic variation.

Last verified on 12-03-2026

Explanation

• Venera-9 was the first spacecraft to land on the surface of Venus.
• Launched by the Soviet Union in 1975.
• It was designed to study the Venusian atmosphere and surface.
• It successfully transmitted data from the planet's surface for 53 minutes before its batteries failed.

Last verified on 12-03-2026

Explanation

• An Addition Reaction is a chemical reaction in which two or more substances combine to form a single compound.
• It is also called a Combination Reaction in basic chemistry.
• This reaction usually releases heat or energy.

Last verified on 12-03-2026

Explanation

• An optical instrument used to measure the properties of visible light is called a Spectroscope.
• It analyzes the composition and properties of materials based on the light they emit or absorb.
• It helping us understand the physical and chemical properties of objects in the universe.

Last verified on 12-03-2026

Explanation

• Global Positioning System (GPS) is a satellite-based navigation system used to monitor the location and movement of vehicles, ships, and aircraft.
• Developed by the United States, it provides accurate position, navigation, and timing information worldwide.
• Widely used in transportation, mapping, military operations, and smartphones.

Last verified on 12-03-2026