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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Thermal Properties of Matter

NTA Abhyas 2020 · Physics · Thermal Properties of Matter

Two rods of the same length and material transfer a given amount of...

Two rods of the same length and material transfer a given amount of heat in 12s12s, when they are joined end to end, i.e. in series. When they are joined in parallel, they will transfer the same heat under the same conditions in

Options

  1. A24s24s
  2. B3s3s
  3. C48s48s
  4. D1.5s1.5s

Correct answer

B. 3s3s

Step-by-step solution

∆t=∆Q(∆x)KA(∆T)∆ t = \dfrac{∆ Q\left(∆ x\right)}{KA\left(∆ T\right)}

When two rods of same length are joined in parallel,

A→2and(∆x)→12timesA \to 2and\left(∆ x\right) \to \dfrac{1}{2}times

∴∆tbecomes14timesi.e.,14×12s=3s∴ ∆ tbecomes\dfrac{1}{4}timesi. e. , \dfrac{1}{4} \times 12s = 3s
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