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Heat and Thermodynamics question

2009 · Shift 0 · Q71
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  5. /2009 · Shift 0 · Q71

Heat and Thermodynamics question

2009 · Shift 0 · Q71

JEE MainPhysicsHeat and ThermodynamicsMCQ+4 / −1
Statement - 1: The temperature dependence of resistance is usually given as R=R0(1+α Δt).R = {R_0}\left( {1 + \alpha \,\Delta t} \right).R=R0​(1+αΔt). The resistance of wire changes from 100Ω100\Omega100Ω to 150Ω150\Omega150Ω when its temperature is increased from 27∘C{27^ \circ }C27∘C to 227∘C{227^ \circ }C227∘C. This implies that α=2.5×10−3/C.\alpha = 2.5 \times {10^{ - 3}}/C.α=2.5×10−3/C. Statement - 2: R=R0(1+α Δt)R = {R_0}\left( {1 + \alpha \,\Delta t} \right)R=R0​(1+αΔt) is valid only when the change in the temperature ΔT\Delta TΔT is small and ΔT=(R−R0)<<R0.\Delta T = \left( {R - {R_0}} \right) \lt \lt {R_0}.ΔT=(R−R0​)<<R0​.
  1. A
    Statement - 1 is true, Statement - 2 is true; Statement - 2 is the correct explanation of Statement - 1
  2. B
    Statement - 1 is true, Statement - 2 is true; Statement - 2 is not the correct explanation of Statement - 1
  3. C
    Statement - 1 is false, Statement - 2 is true
  4. D
    Statement - 1 is true, Statement - 2 is false
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