Terrestrial radiation
Terrestrial radiation is a Geography concept from the MPSC syllabus, tested in 3 past MPSC questions (2014, 2019, 2025). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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विधाना अ आणि ब यांचे परीक्षण करून योग्य पर्याय निवडा. विधान 'अ': सौरशक्तीपासून येणाऱ्या उष्णतेपैकी 35% उष्णतेचा पृथ्वीचा पृष्ठभाग आणि वातावरण तापण्यास उपयोग होत नाही तिला पृथ्वीची भू-धवलता असे म्हणतात. विधान 'ब': हवेचे अणू, लहान धूलिकण, ढग, पृथ्वीचा पृष्ठभाग यांच्यापासून विकीरण व परावर्तन क्रियेमुळे उष्णता लघुलहरीद्वारे अवकाशात पाठवली जाते. Examine the statement A and statement B. Statement 'A': 35% solar energy is not useful for the heating of Earth's surface as well as atmosphere, that heat is called “Albedo of the Earth's surface”. Statement 'B': Through Short Waves, Scattering and Reflection process of the air molecules, heat is transferred by the small dust particles, clouds and earth's surface in the space.
Albedo is the proportion of solar radiation reflected by the Earth's surface and atmosphere (about 35% is reflected/scattered back to space directly). Statement B correctly explains the mechanism of reflection and scattering via short waves.
खालीलपैकी कोणते घटक दैनिक व ऋतुपरत्वे सौरऊर्जेची तीव्रता व प्रमाण ठरवितात. Which of the following factors determine diurnal and seasonal variation in intensity and amount of solar radiation ?
(a)पृथ्वीच्या अक्षाचा कललेला पणा (Inclination of the axis of the earth.)
(b)दिवस व रात्र प्रमाण (Length of the day.)
(c)ढगांचे प्रमाण (Extent of clouds)
(d)सूर्य किरणानी पृथ्वीच्या पृष्ठभागाशी केलेला कोन (Angle of inclination of the Sun's rays)
Solar radiation intensity and amount vary due to multiple factors including the earth's axis inclination, the length of day and night, cloud cover, and the angle of incidence of the sun's rays.
खालील विधानांचा विचार करा. / Consider the following statements. आता सांगा की / Now state whether :
(a)तपाम्बराचे तापमान सामान्यतः वाढत्या उंची बरोबर कमी होते. / The temperature of the troposphere generally decreases with increasing altitude.
(b)तपांबर हे सूर्याकडून लघु तरंगाच्या स्वरूपात येणाऱ्या सौरप्रारणाच्या शोषणाने नव्हे तर पृथ्वीच्या पृष्ठभागावरून होणाऱ्या उष्णतेच्या वहनाने तापवले जाते. / The troposphere is heated not by absorption of incoming short wave solar radiation but by transfer of heat from the earth's surface.
Troposphere temperature decreases with altitude (lapse rate), and it is primarily heated from the earth's surface through terrestrial radiation and conduction rather than direct solar shortwave absorption.