GK (Mixed)

The world-famous pyramids, specifically the Giza pyramid complex including the Great Pyramid, are located in Egypt. While other cultures built pyramids, the ones most commonly referred to as 'world famous' are the ancient Egyptian structures. Persia, Arabia, and Italy are not primarily known for these structures.

Bauxite is the primary ore from which aluminium is commercially extracted. It consists mainly of aluminium oxide minerals. Silver, copper, and manganese are extracted from different ores such as argentite, chalcopyrite, and pyrolusite, respectively.

Hicky's Bengal Gazette, started by James Augustus Hicky in 1780, was the first printed newspaper in India. It was an English-language weekly published in Kolkata. The other options like The Hindu and The Times of India were established much later in the 19th century.

The Election Commission of India currently consists of the Chief Election Commissioner and two other Election Commissioners, making it a three-member body. This structure was permanently established in 1993 to ensure a multi-member decision-making process. Previously, it had been a single-member body for much of its history.

A starfish is not a 'true fish' because it is an invertebrate belonging to the phylum Echinodermata, lacking a backbone and gills. Sharks, eels, and seahorses are all vertebrates that belong to the class of fish (Chondrichthyes or Osteichthyes).

Trypsin is a digestive enzyme produced in the pancreas that breaks down proteins into smaller peptides in the small intestine. It is essential for protein digestion. It does not synthesize proteins or break down fats or carbohydrates.

Flash bulbs used in early photography contained a fine wire or foil made of magnesium or aluminium. When ignited by an electric current, the metal burns rapidly in an oxygen-rich atmosphere, producing a brilliant white flash. Magnesium is the classic material for this purpose.

A fuse is a safety device designed to protect an electrical circuit from excessive current. It contains a wire that melts and breaks the circuit if the current becomes too high, thereby limiting the flow and preventing damage or fire. A conductor, by contrast, allows current to flow easily.

Neon gas is widely used in discharge tubes for advertising signs because it emits a bright, distinctive reddish-orange glow when electrified. Other noble gases like argon or helium can be used to produce different colors, but 'neon signs' are the most common application. Neon is the primary gas associated with these tubes.

Galvanization is the process of applying a protective coating of zinc to iron or steel to prevent rusting. Zinc acts as a sacrificial anode, corroding in place of the iron. Note that 'zink' is a common misspelling of 'zinc'.

A light year is the distance that light travels in a vacuum in one Julian year. Despite having the word 'year' in its name, it is a unit of astronomical distance, not time. It is approximately 9.46 trillion kilometers.

The pH scale ranges from 0 to 14, where 7 is neutral. A pH value between 6.5 and 7.5 is very close to 7 and is generally classified as neutral in soil science and agriculture. Values significantly below 6.5 are acidic, and those significantly above 7.5 are basic.

The Nilgiri Biosphere Reserve, established in 1986, was the first biosphere reserve in India. It is located in the Western Ghats and spans across the states of Tamil Nadu, Kerala, and Karnataka.

Correct option is (1). 

The Brahmaputra river originates in the Chemayungdung glacier in Tibet (China), flows through the Indian states of Arunachal Pradesh and Assam, and finally enters Bangladesh before emptying into the Bay of Bengal.

Correct option is (1). 

Kanchipuram, also known as Kanchi, was the capital of the Pallava dynasty, which ruled parts of southern India between the 4th and 9th centuries. It was a renowned center of learning and is famous for its temples.

Razia Sultan was the daughter of Shams-ud-din Iltutmish, the third ruler of the Mamluk dynasty. She succeeded him to become the first female ruler of the Delhi Sultanate.

Iodine is a critical component for the production of thyroid hormones. A deficiency in dietary iodine causes the thyroid gland to overwork and enlarge, a condition commonly known as goitre.

The anther is the part of the stamen (the male reproductive organ of a flower) that produces and contains pollen grains. Sepals and petals are non-reproductive parts that protect the bud and attract pollinators.

Baking soda is the common name for sodium bicarbonate, which has the chemical formula NaHCO3. Sodium carbonate (Na2CO3) is known as washing soda.

Foot-and-mouth disease (FMD) is a highly infectious viral disease that affects cloven-hoofed animals. This group includes domestic livestock such as cattle, sheep, goats, and pigs.