Question Discussion & Solution

Eureka:

• Constantan is a Nickel-Copper alloy also known as Eureka.
• It usually consists of 55% copper and 45% nickel.
• Its main feature is the low thermal variation of its resistivity, which is constant over a wide range of temperatures
• Constantan is a Nickel-Copper-based alloy wire that has a high resistivity and is mainly used for thermocouples and electrical resistance heating.
• It has a constant resistivity over a wide range of temperatures.
   

Composition:

• Ni = 45 %
• Cu = 55 %
   

Properties of Eureka:

• Resistivity - 490 µΩ -cm
• Melting point: 1300 ⁰C
• Specific gravity: 8.9 gm /cm³
• Negligible temperature Coefficient
• Easily ductile
• Resistant to atmospheric corrosion
• Can be easily soldered and moulded
   

Application:

• It is used for the measurement of temperature.
• It is used for the formation of thermocouple, along with the wires of other metals such as copper, iron, and chromium.
• It is especially used for resistance purposes since its resistance does not change much with the change in its temperature. It is used for DC current shunts. 

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.

The correct answer is Mode of Nutrition.

• In 1969, R.H. Whittaker introduced the five-kingdom system of classification.
• In the five-kingdom system, the basis of classification is the complexity of cell structure, physical organization, nutrition method, and life cycle.
• Aristotle firstly divided the living world into two groups, namely, flora and fauna.
• After that, in his book 'Systema Naturae', Linnaeus classified all animals into plants and animals.
• Linnaeus is called the 'father of modern classification system'.

Additional Information

• Whittaker classified all creatures in the following five kingdoms -

1. Kingdom Monera-
   • ​​This world consists of prokaryotic organisms ie Bacteria, Cyanobacteria, and Archaebacteria.
2. Kingdom Protista-

• This world consists of unicellular eukaryotic organisms. Yuglina, which is situated between plants and animals, is included in this world.

3. Kingdom Fungi-

• This includes organisms dependent on parasites and dead food for food. Their cell wall is made of chitin.

4. Plant World (Kingdom Plantae)-

• This world consists of algae and multicellular green plants.

5. Kingdom Animal-

• This includes all multicellular animals. It is also called 'Metazoa'.

Rickshaw, bus and train are the means of transport.

Mobile and radio are the means of communication, so out of the given options only letter is a mean of communication.

Option(2) is correct.

Argument I: Yes, banning will reduce misuse: No, definitely not, banning mobile phones is not a solution as the Mobile phone is used for several purposes, for study, for payment, and more, So the argument I is not strong.

Argument II: No, it will have only a very limited impact: Moblie phone has several benefits, Online classes, useful videos, internet banking, etc. it is the very useful and very low impact of missuse.So, argument II is strong.

Hence, the correct answer is an option(2)i.e., Argument II is strong.