Joint Entrance Examination/AIEEE 2009/Q072 RESISTANCE VS TEMPERATURE

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Original Question by 164.100.170.4

Here's the question...
 Q74. Statement 1: The temperature dependence of resistance is usually given as R = R0(1 + αΔt). The resistance of a wire changes from 100 Ω to 150 Ω when its temperature is increased from 27°C to 227°C. This implies that α = 2.5 × 10–3/°C. Statement 2: R = R0(1 + αΔt) is valid only when the change in the temperature ΔT is small and ΔR = (R – R0) < < R0. (1) Statement 1 is true, statement 2 is true; Statement 2 is the correct explanation of Statement 1 (2) Statement 1 is true, Statement 2 is true; Statement 2 is not the correct explanation of Statement 1 (3) Statement 1 is false, Statement 2 is true (4) Statement 1 is true, Statement 2 is falsePosted by 164.100.170.4 05:18, 24 September 2009 (UTC)

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