PRELIMS मतलब MAD

Answer- (c)
Explanation:

• About ocean trenches: Ocean trenches are steep depressions in the deepest parts of the ocean. They are formed by subduction. Hence Statement -I is correct.

• Subduction is a geophysical process in which two or more of Earth’s tectonic plates converge. When two tectonic plates collide, the older, denser plate is pushed beneath the lighter plate and deep into the mantle. It causes the seafloor and outermost crust (the lithosphere) to bend and to form a steep, V-shaped depression. Hence Statement- II is not correct.

• This process makes trenches dynamic geological features as they account for a significant part of Earth’s seismic activity and are frequently the site of large earthquakes, including some of the largest earthquakes.
  

Answer- (c)

Explanation:

• About the Dew: It is formed when the moisture is deposited in the form of water droplets on cooler surfaces of solid objects (rather than nuclei in air above the surface) such as stones, grass blades and plant leaves.
• The ideal conditions for the formation of dew: Clear sky, calm air, high relative humidity, and cold and long nights.
  • Also, it is necessary that the dew point (Air temperature) is above the freezing point.
• Hence option (c) is the correct answer.

Answer- (b)
Explanation:

• Statement 1 is correct: Western Ghats are comparatively higher in elevation than the Eastern Ghats. The average elevation of the Western Ghats is about 1,500 m with the height increasing from north to south.
  • Anamudi (2,695 m) is the highest peak of the Peninsular plateau located on the Anaimalai hills of the Western Ghats followed by Dodabetta (2,637 m) on the Nilgiri hills.
• Statement 2 is not correct: Eastern Ghats comprises the discontinuous and low hills. Eastern Ghats are highly eroded by the rivers such as the Mahanadi, the Godavari, the Krishna, the Kaveri, etc. Western Ghats are more continuous than the Eastern Ghats.
• Statement 3 is correct: The Eastern and the Western Ghats meet each other at the Nilgiri hills.

Answer- (d)
Explanation:

• Statement 1 is not correct: Infant mortality rate (or IMR) is defined as the number of infant deaths in a year per 1,000 live births during the year.
• Statement 2 is not correct: Maternal Mortality Ratio (MMR) is defined as the annual number of maternal deaths per 100,000 live births.
  • A maternal death is the death of a woman while pregnant or within 42 days of termination of pregnancy, from any cause related to or aggravated by the pregnancy or its management, but not from accidental or incidental causes.
• Statement 3 is not correct: Stillbirth Rate is defined as the death of a foetus weighing 1000g (equivalent to 28 weeks of gestation)or more, during one year in every 1000 total births.

Answer- (c)
Explanation:

• Statement -I is correct: Most of the major Peninsular rivers except Narmada and Tapi flow from west to east and empties into the Bay of Bengal.
• Statement -II is not correct: The reason for the orientation of the entire drainage system towards the Bay of Bengal is the slight tilting of the Peninsular block from northwest to the southeastern direction.