Question Discussion & Solution

The correct answer is Copper and Tin.
Key Points

• Bronze
  • Bronze is an alloy traditionally composed of copper and tin.
  • Bronze is of exceptional historical interest and still finds wide applications.
  • It was made before 3000 BC, though its use in artifacts did not become common until much later.
  • The proportions of copper and tin varied widely (from 67 to 95 percent copper in surviving artifacts), but, by the Middle Ages in Europe, certain proportions were known to yield specific properties.
  • An alloy described in an 11th-century Greek manuscript in the library of St. Mark’s, Venice, cites a proportion of one pound copper to two ounces of tin (8 to 1), approximately that used for bronze gunmetal in later times.
  • Some modern bronzes contain no tin at all, substituting other metals such as aluminum, manganese, and even zinc.

Additional Information

• Copper and Silver
  • The best-known copper-silver alloy is sterling, which is 92.5 percent silver and 7.5 percent copper.
  • In England sterling, silver is traditionally identified by the hallmark of a lion passant.
  • Coin silver is an alloy of 90 percent silver and 10 percent copper.
  • For jewelry and ornaments, 85–90 percent silver (and the balance copper) is frequently used.
  • Dental alloys of 60–70 percent silver, 18–25 percent tin, 2–14 percent copper, and 0.5–2 percent zinc are amalgamated with varying quantities of mercury to form the filling materials for cavities in teeth.
• Copper and zinc
  • Brass is an alloy of copper and zinc, of historical and enduring importance because of its hardness and workability.
  • The earliest brass was called calamine brass, which dates to Neolithic times.
  • It was probably made by the reduction of mixtures of zinc ores and copper ores.
  • In ancient documents, such as the Bible, the term brass is often used to denote bronze, the alloy of copper with tin.
• Copper and Lead
  • Leaded bronzes contain from 4 to 25 percent lead plus additions of copper and tin, and some copper-lead bearing alloys contain up to 40 percent lead.
  • All these bearing alloys are sufficiently soft so that lubrication failure does not result in damage to the bearing.
  • Lead-based bearing alloys are also known as lead-based babbitt metals or white metals.
  • These are usually antimonial lead with widely variable additions of tin or copper (or both) and arsenic to increase strength.
  • One such alloy is commonly used for railroad-car journal bearings, contains 86 percent lead, 9 percent antimony, and 5 percent tin.
  • Many alloys of lead and alkaline-earth metals, such as calcium and sodium, also are widely used as bearing materials.

The correct answer is Sesamum.

Key Points

• Seasame is a Rabi crop in South India.
• It is a flowering plant in the genus Sesamum and in India, it is smaller in numbers.
• Another species of Sesamum is S. Indicum.
• Sesamum is also known as Benne.
• The mustard plant is a plant species in the genera Brassica and Sinapis in the family Brassicaceae.​

Additional Information

• Finger millet (Ragi)
  • Millet is a collective term referring to a number of small-seeded annual grasses that are cultivated as grain crops, primarily on marginal lands in dry areas in temperate, subtropical, and tropical regions.
  • Some of the common millets available in India are Ragi (Finger millet), Jowar (Sorghum), Sama (Little millet), Bajra (Pearl millet), and Variga (Proso millet).
• Barley
  • Barley is cultivated as a rabi season crop in Rajasthan.
  • It is sown in October-December and harvested from March to May.
• Wheat
  • It is a Rabi crop generally sown between October & November harvested between April & May.

Concept-

• A cell is defined as the smallest unit of an organism with a nucleus.
• cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.

• Example- a unit in the tissue of an animal muscle.

Key PointsParts of cell-

Cell membrane

• It is also called the plasma membrane,
• It is found in all cells and separates the interior of the cell from the outside environment.
• It is the outermost wall in the animal cell and placed next to the cell wall in the plant cell.
• Being an outer boundary of a cell, it provides shape to the cell.

Cell wall

• A cell wall is defined as the non-living component, covering the outmost layer of a cell.
• cell wall separates the interior contents of the cell from the exterior environment.
• It also provides shape, support, and protection to the cell and its organelles.

Nucleus

• A nucleus is defined as a double-membraned eukaryotic cell organelle that contains genetic material.
• It contains the cell’s hereditary information and controls the cell’s growth and reproduction
• It is responsible for coordinating many of the important cellular activities such as protein synthesis, cell division, growth, and a host of other important functions.

Ribosomes

• The ribosome is a complex molecule made of ribosomal RNA molecules and proteins that form a factory for protein synthesis in cells.

Additional Information  Cell was discovered by Robert Hooke in 1665, the cell has a rich and interesting history that has ultimately given way to many of today's scientific advancements.

The correct answer is Kuchipudi Dance.

• Yamini Krishnamurti is related to Kuchipudi Dance.

Key Points 

• Yamini Krishnamurti is a Kuchipudi dancer.
• She also knows Bharatnatyam.
• A Passion For Dance is her autobiography.
• Kuchipudi:
  • It is the classical dance of Andhra Pradesh.
  • Kuchipudi derives its name from the Kuchipudi village of Andhra Pradesh.
  • Kuchipudi exhibits scenes from the Hindu Epics, legends and mythological tales through a combination of music, dance and acting.
  • Like other classical dances, Kuchipudi also comprises pure dance, mime and histrionics but it is the use of speech that distinguishes Kuchipudi’s presentation as dance-drama.
  • ‘At times, even though the dramatic situation did not demand, solo dancing was being presented to punctuate the presentation and to enhance the appeal. One such number is tarangam inspired by the Krishna-Leela tarangini of Teerthanarayana Yogi.
  • There are now two forms of Kuchipudi
    • The traditional musical dance drama 
    • The solo dance.
• Bharatnatyam is the classical dance of Tamil Nadu.

Spam:

• the word spam is commonly used to describe unsolicited e-mails that are sent in bulk.
• It is the use of electronic messaging systems like emails and other digital delivery systems to send unwanted bulk messaged indiscriminately.
• Spamming means posting or emailing unsolicited advertising messages to a wide audience.
• It is used by companies to market their products, sometimes they are also used for dubious purposes to scam innocent people.

A virus

• It is a program that can infect other programs by modifying them to include a possibly evolved copy of itself.
• A computer Virus is nothing but a computer program that does unwanted things with your computer resources e.g. you are working on PC and you are repeatedly receiving the annoying message.
• A computer virus passes from computer to computer like a biological virus passes from person to person
• Common types of virus: File virus, Macro virus, Trojan Horse, Worm

Worm:

• A computer worm is a type of malware that spreads copies of itself from computer to computer.
• A worm can replicate itself without any human interaction, and it does not need to attach itself to a software program in order to cause damage.

Threat:

• A computer threat can be "intentional" such as hacking or "accidental" such as malfunctioning or physical damage.
• Security threat is defined as a risk which can potentially harm computer systems and organization.

Hence, it is clear that An unsolicited e-mail message sent to many recipients at once is called Spam.