Explanation

• Newton’s Law of Gravitation was given by Isaac Newton.
• It states that every object in the universe attracts every other object.
• The force depends on mass and distance between objects.
• It is called the Universal Law of Gravitation.
• It applies to all bodies, small and large.

Last verified on 30-05-2026

Explanation

• Meteorology is the scientific study of the atmosphere, especially weather and climate.
• It involves forecasting and understanding atmospheric phenomena.
• Meteorology is a branch of the atmospheric sciences.
• Metrology is the scientific study of measurement.

Last verified on 03-04-2026

Explanation

• The first metal discovered and used by humans was Copper.
• It was found in native form (pure metal) in nature.
• Early humans used it for tools and ornaments before iron age.
• This period is known as the Copper Age (Chalcolithic Age).

Last verified on 30-05-2026

Explanation

• Anemometer is a scientific instrument used to measure wind speed (velocity).
• It is mainly used in meteorology and weather forecasting.
• It helps in studying storms, cyclones, and air pressure changes.
• Common types include cup, vane, and hot-wire anemometers.

Additional Information:

• A hygrometer is an instrument used to measure humidity.
• A salinometer is used to measure the salinity
• A bolometer is used to measure the power of incident electromagnetic radiation
• A barometer is used to measure air pressure in certain environment.

Last verified on 30-05-2026

Explanation

• A light year is the distance that light travels in one year.
• It is used to measure vast distances in space.
• Light moves at approximately 299,792 km per second.
• One light year ≈ 9.46 trillion kilometers (5.88 trillion miles).

Last verified on 17-03-2026

Explanation

• A lactometer is used to measure the purity and density (thickness) of milk.
• It checks if milk has been adulterated with water by measuring specific gravity.
• Works on the principle of buoyancy.
• Pure milk specific gravity: 1.028–1.032 at 15°C

Last verified on 16-03-2026

Explanation

• The average normal body temperature is generally accepted as 98.6°F (37°C).
• A temperature over 100.4°F (38°C) means you have a fever.

Additional Information:

• Hypothermia is the term used for temperature less than 36.50°C.
• Mild Pyrexia is the term used for temperature (99-100°F).
• Moderate Pyrexia is the term used for temperature (100-103°F).
• Severe Pyrexia is the term used for temperature (103-105°F).

Explanation

• Natural gas is supplied through underground pipeline networks, making it convenient for homes.
• It is cleaner than solid fuels like coal or wood.
• It producing less smoke and ash.
• This makes it ideal for urban domestic energy use.

Last verified on 25-05-2026

Explanation

• Solar energy comes from the Sun.
• It is continuously available.
• It is a renewable energy source because it is naturally replenished.
• Fossil fuels (coal, petroleum, natural gas) are finite and polluting.

Last verified on 25-05-2026

Explanation

• The nucleus contains DNA (genetic material).
• It controls all cellular activities like growth, division, and protein synthesis.
• That is why it is called the control center of the cell.

Last verified on 25-05-2026