Question Discussion & Solution

The correct answer is Concave lens.

Key Points

• To treat the eye disease known as myopia or nearsightedness we use the Concave Lens.
• A concave lens is a category of lens that deviates a straight light beam coming from the origin to a diminished, upright, virtual image.
• It can construct both real and virtual images.
• The convex lens is a lens that tends to meet at a point of rays of light that convey parallel to its principal axis which is comparatively thick across the middle and thin at the lower and upper edges.
• A convex lens is used in cameras, correction of Hyperopia, etc.
• Bifocal lenses hold two different prescriptions, an upper part to allow for distance vision and an additional power on the bottom part of the lens to help in close-up focus.
• A bifocal lens is used in people suffering from presbyopia, myopia, hyperopia, and astigmatism.
• The result is eyesight lucidity at both distance and near with one pair of glasses.
• A Compound lens is simple lenses made on a general axis usually in close proximity and often cemented with each other.

Additional Information

Crane, swan and falcon are the birds whereas frog is not a bird.

The correct answer is 172.

• Article 172 of the Indian Constitution relates to the tenure of the state legislature.

Key Points

• State Legislature:
  • Articles 168 to 212 in Part VI of the Constitution deals with the organization, composition, duration, officers, procedures, privileges, powers of the state legislature.
  • States having bicameral legislatures are Andhra Pradesh, Telangana, Uttar Pradesh, Bihar, Maharashtra, and Karnataka. 
    • {Trick to Remember- KUMBAT- Karnatak, Uttar Pradesh, Bihar, Maharashtra, Andhra Pradesh, Telangana}
  • The legislature's maximum strength is fixed at 500 and minimum strength at 60.
  • Article 172 deals with the Duration of State Legislatures.

Additional Information 

The correct answer is Another name for the coronavirus that created the epidemic in 2020.

Key Points

• The Ministry of AYUSH has launched the Jan Andolan Campaign on COVID-19.
• This Andolan is regarding “Public Health Response to COVID-19: Campaign for COVID-Appropriate Behaviour” which has been launched by the Prime Minister.
• The three key messages which are being highlighted across it are - “Wear Mask, Follow Physical Distancing, and Maintain Hand Hygiene.

The correct answer is Aravali.

• Aravali range forms the main water area for Rajasthan.

Key Points

• Aravali range​
  • The Aravallis of Northwestern India, one of the oldest fold mountains of the world, now form residual mountains with an elevation of 300m. to 900m.
  • They stretch for a distance of 800 km from Himmatnagar in Gujarat to Delhi, spanning Haryana, Rajasthan, Gujarat, and Delhi, the 692 kilometres (km).
  • The Aravallis act as a barrier between the fertile plains in the east and the sandy desert in the west.
  • Historically, it is said that the Aravalli range checked the spread of the Thar desert towards the Indo-Gangetic plains, serving as a catchment of rivers and plains.
  • Thus Aravali range forms the main water area for Rajasthan.

​Additional Information

•  Aravali range formation
  • ​These are fold mountains of which rocks are formed primarily of the folded crust when two convergent plates move towards each other by the process called orogenic movement.
  • The Aravallis date back to millions of years when a pre-Indian sub-continent collided with the mainland Eurasian Plate.
  • Carbon dating has shown that copper and other metals mined in the ranges date back to at least the 5th century BC.