Thermal conductivity
Thermal conductivity is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2016, 2025). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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एकाच पदार्थाच्या दोन रॉडच्या लांबी त्रिजेचे गुणोत्तर 1 : 2 आणि 2 : 3 आहे. जर रॉडच्या दोन्ही टोकांमधील तापमानातील फरक समान असेल तर उष्णता प्रवाहाचे गुणोत्तर किती असेल ? The ratio of lengths to radii of two rods of same material is 1 : 2 and 2 : 3. If temperature difference between two ends of the rod is same, then what will be the ratio of heat flow ?
Heat flow formula Q = (KA Delta T)/L. Since material is same, K is constant. Using radii ratios and length ratios, the heat flow ratio calculates to 8 : 9.
अभ्रक कपड्यांच्या स्त्रीतीत वापरला जातो. यासंदर्भात पुढील दोन विधानांपैकी कोणते योग्य आहे ? / Mica is used in the iron for pressing clothes. In this connection, which of the following two statements is/are correct ?
(a)अभ्रक विजेचा सुवाहक आहे. / Mica is a good conductor of electricity.
(b)अभ्रक उष्णतेचा सुवाहक आहे. / Mica is a good conductor of heat.
Mica is an excellent electrical insulator (prevents current leakage) while being a good thermal conductor (transfers heat efficiently to the iron base).