Explanation

• Isaac Newton (1642–1727) was an English physicist and mathematician.
• He formulated the laws of motion and law of universal gravitation.
• His work laid the foundation for classical mechanics.

Last verified on 02-04-2026

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

Explanation

• Platelets, also called thrombocytes.
• They are blood cells that play a vital role in blood clotting.
• When a blood vessel is injured, platelets aggregate to form a plug that stops the bleeding.

Last verified on 02-04-2026

Explanation

• Glass and pitch are examples of pseudo solids.
• Pseudo solid is a solid which possesses the property of liquids.
• Glass is a pseudo solid and in a very slow process, it flows like a liquid due to which the base of glass gets thicker than top.

Last verified on 02-04-2026

Explanation

• During the day, plants perform photosynthesis, absorbing carbon dioxide and releasing oxygen.
• At night, in the absence of sunlight, they undergo respiration, where they take in oxygen and release carbon dioxide.

Last verified on 02-04-2026

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Last verified on 02-04-2026

Explanation

• The freezing (or melting) point of ice on the Fahrenheit scale is 32°F.
• This is the temperature at which ice turns from a solid to a liquid. 
• The Fahrenheit scale also defines the boiling point of water as 212°F.
• A change of 1°F on the Fahrenheit scale is less than a 1°C change on the Celsius scale.

Last verified on 02-04-2026

Explanation

• The Theory of Relativity was proposed by Albert Einstein.
• It was introduced in the early 20th century.
• It includes Special Relativity (1905) and General Relativity (1915).
• The theory explains the relationship between space, time, and gravity.

Last verified on 02-04-2026

Explanation

Explanation

• The usual gases used for lifting airships are hydrogen and helium.
• Hydrogen is the lightest known gas and thus has great lifting capacity,
• Helium is not as buoyant but is far safer than hydrogen because it does not burn.

Last verified on 01-04-2026