The 61st Amendment to the Indian Constitution, enacted in 1988, lowered the voting age from 21 to 18 years.

Tert-butylamine is a strong base due to steric hindrance that prevents protonation, making it more stable.

Aniline is derived from an aromatic compound (benzene) and contains an amino group.

Ethylamine has the highest boiling point due to its ability to form stronger hydrogen bonds compared to the others.

Trimethylamine is known for its strong fishy odor, often associated with decaying fish.

Trimethylamine is known for its strong fishy odor, often associated with decaying fish.

Aniline is most likely to undergo electrophilic aromatic substitution due to the presence of the amino group, which is a strong activating group.

Methylamine is the most soluble in water due to its smaller size and ability to form hydrogen bonds.

Lidocaine is an amine used as a local anesthetic.

Triethylamine is commonly used as a solvent in organic reactions.

Aniline is widely used in the preparation of dyes due to its reactivity.

A capacitor can be likened to a sponge that stores water, as it stores electrical energy in the form of charge.

A short circuit can be compared to a direct path for water, bypassing the intended route and causing excessive flow.

An inductor can be compared to a flywheel, as it stores energy in a magnetic field and resists changes in current.

The Babylonians are credited with the development of the first known star catalog, which dates back to around 1000 BCE, showcasing their advanced astronomical knowledge.

The Sumerian civilization is credited with the development of the first known writing system, cuneiform, around 3200 BCE.

Ancient China developed various strategies to manage drought and famine, including the construction of irrigation systems.

The Phoenicians (circa 1200 BCE) are credited with the first known use of wind energy for sailing, utilizing sails on their ships for maritime trade.

The ancient Egyptians are known for building pyramids as tombs for their pharaohs.

The Indus Valley Civilization is renowned for its sophisticated urban planning and drainage systems, which were crucial for managing floods.

The Indus Valley Civilization (c. 2500-1900 BCE) had advanced urban planning and evidence of medical practices, including surgery and the use of medicinal plants.

The Babylonian Civilization (circa 2000 BCE) is renowned for its early astronomical observations and the establishment of observatories, which laid the groundwork for future astronomical studies.

The Ancient Egyptian Civilization developed around the Nile River, where they understood the seasonal flooding and its impact on agriculture, showcasing an early awareness of climate patterns.

The Indus Valley Civilization is renowned for its sophisticated water conservation techniques, including the construction of stepwells and drainage systems.

The Greeks, particularly figures like Copernicus, contributed significantly to the development of the heliocentric model of the universe.

The Mayan Civilization is credited with significant advancements in mathematics, including the concept of zero, which was a revolutionary idea in the development of numerical systems.

The Greek civilization is renowned for its advancements in sculpture, particularly the creation of life-sized statues that emphasized realism and human anatomy.

The Indus Valley Civilization is known for its advanced agricultural practices, including the domestication of plants and animals, which are foundational aspects of biotechnology.

The Roman Empire is well-known for its sophisticated border management, including the construction of fortifications and walls like Hadrian's Wall.

The ancient Greeks are well-known for their use of the post-and-lintel construction method, particularly in their temples like the Parthenon.