Question Discussion & Solution

The correct answer is Plaster of Paris.

Key Points

• Plaster of Paris is the generic name of calcium sulphate hemihydrate-CaSO₄. 1/2H₂O.
  • Plaster of Paris is manufactured by heating gypsum at 423K or 150^o C/300^o F.
  • On heating gypsum at 423 K, it loses water molecules and becomes calcium sulfate hemihydrate. This product is known as the plaster of Paris.

Important Points

• Application of Plaster of Paris-
  • It is used as a building material as a protective coating on walls and ceilings.
  • It is used as a moulding and vesting agent for decorative elements.
  • It is also used for aesthetic touch to the construction elements.
  • It is also field as plaster in orthopedics and as a filling material by dentists, etc.

Additional Information

• Baking soda is also known as sodium bicarbonate or bicarbonate of soda.
• Vinegar is also known as acetic acid. It typically contains 5–8% acetic acid by volume.
• Washing soda is a chemical compound with the formula Na₂CO₃, also known as sodium carbonate.

Data for B+ Tree:

Disk Block size = D= 256 byte

Block pointer = B = 2 byte

Key field = K = 8 byte.

Order = p

Formula:

p × 2 + (p – 1) (8) ≤ 256

Calculation:

p × 2 + (p – 1) (8) ≤ 256

2p + 8p ≤ 264

p ≤ 26.4

∴ p = 26

After reading statement and conclusion we say that -

i) All people who are good at dance are pianists. → False (We cannot say that all good dancer are pianists)

ii) Some people who are good at dance are pianists. → True ( As all pianists are good dancer means some of the good dancers are pianists) 

Hence, "Only conclusion ii) follows" is the correct answer.

The correct answer is Kalology.

Key Points

• The study of human beauty is called Kalology.
  • Kalology is the study of beauty and the ways in which beauty influences society.
  • This study is focused primarily on human attractiveness, rather than the broader field of aesthetics, and was popularized during the 19th century when philosophers attempted to codify beauty and create a uniform system for evaluating it.
  • A scale was even proposed, probably jokingly, which rated beauty in terms of the theoretical beauty of Helen of Troy, who allegedly had a face to launch 1,000 ships.

Additional Information

The correct answer is ​Myopia.

Key Points

• Nearsightedness (myopia) is a common vision condition in which you can see objects near to you clearly, but objects farther away are blurry.
• It occurs when the shape of your eye causes light rays to bend (refract) incorrectly, focusing images in front of your retina instead of on your retina.
• A Concave lens (diverging lens) is used by people suffering from myopia.

Additional Information 

• Far-sightedness, also known as long-sightedness, hypermetropia, or hyperopia, is a condition of the eye where distant objects are seen clearly but near objects appear blurred.
  • This blurred effect is due to incoming light being focused behind, instead of on, the retina wall due to insufficient accommodation by the lens.
• Night blindness is a type of vision impairment also known as nyctalopia.
  • People with night blindness experience poor vision at night or in dimly lit environments.
  • Although the term “night blindness” implies that you can't see at night, this isn't the case.
• Astigmatism: This defect arises due to the difference in the radius of curvature of the cornea in the different planes
  • The cylindrical lens is used by people suffering from Astigmatism.