The question asks about the role of the ionosphere in radio communication. We need to evaluate two statements regarding the mechanism of radio wave reflection and the wavelength of radio waves.
Since both statements are incorrect, the correct option is D.
Correct Option: D) Neither 1 nor 2
The question asks us to differentiate between La Niña and El Niño phenomena based on their characteristics and effects on the Indian monsoon. We need to evaluate each statement for its accuracy.
Since both statements are incorrect, the correct option is D.
Correct Option: D) Neither 1 nor 2
The question asks to identify the correct reason(s) why Westerlies are stronger and more persistent in the Southern Hemisphere compared to the Northern Hemisphere. We need to evaluate each given statement based on geographical and atmospheric principles.
A) 1 only — Statement 1 correctly identifies that the lesser landmass in the Southern Hemisphere reduces friction and obstructions for the Westerlies, allowing them to be stronger and more persistent.
The question asks for the main reason(s) behind the formation of the African and Eurasian desert belt. This requires understanding global atmospheric circulation patterns and their influence on climate, specifically desert formation.
Correct Option: A) 1 only
The question asks why jet aircraft fly easily and smoothly in the lower stratosphere. This requires understanding the atmospheric conditions in the lower stratosphere, specifically regarding weather phenomena and air movement.
C) Both 1 and 2 are correct. The lower stratosphere is ideal for jet aircraft because it lacks significant weather phenomena (clouds, precipitation, water vapor) and is very stable with minimal vertical air movement, leading to smooth flying conditions and reduced drag.
The question asks why temperature normally decreases with an increase in height from the Earth's surface. This phenomenon is known as the environmental lapse rate. We need to evaluate the given statements to determine which ones correctly explain this.
C) 1 and 3 only — Statements 1 and 3 accurately explain why temperature decreases with increasing height. The Earth's surface is the primary heat source for the troposphere, and the decreasing density of air with altitude leads to less heat absorption and retention at higher elevations.