Question Discussion & Solution

The correct answer is 14 years.

• Under Section-3 of the "Children and Adolescent Labor (Prohibition and Regulation) Act", it a cognizable offence for a child of 14 years to work in any type of hazardous area or non-risk area.

Key Points

• Child and Adolescent Labour (Prohibition and Regulation) Act, 1986
  • As per the Child and Adolescent Labour (Prohibition and Regulation) Act, 1986, a "Child" is defined as any person below the age of 14, and the CLPR Act prohibits employment of a Child in any employment including as domestic help.
  • The act was amended in 2016 ("CLPR Act").

​Additional Information

• Importance of the act
  • In 2011, the national census of India found the total number of child labourers, aged [5–14], to be at 10.1 million, out of the total of 259.64 million children in that age group.
  • The child labour problem is not unique to India; worldwide, about 217 million children work, many full-time.

Four members: A, B, C, D

Using the symbols in the table given below, we can draw the following family tree:

1) B is the husband of A

2) C is the sister of B

3) D is the brother of A

Hence, C is D’s brother-in-law's sister.

Concept:

The Android operating system was developed by Google for use in all of its touchscreen devices, tablets, and cell phones. This operating system was first developed by Android, Inc., a software company located in Silicon Valley before it was acquired by Google in 2005

The first public release of Android 1.0 occurred with the release of the T-Mobile G1 (aka HTC Dream) in October 2008. Android 1.0 and 1.1 were not released under specific code names.

Android name with their respective versions

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.

• Becquerel is the SI unit of radioactivity.
• 1 Becquerel = 1 disintegration/Second
  • Disintegration: As the radioactive elements are unstable they will disintegrate at any moment by emitting alpha or beta particles and form new elements called daughter elements which are completely different in both physical and chemical properties when compared to the elements they came from.
  • The rate of disintegration does not depend upon external factors like temperature, pressure, etc.