NEET2019Physics-Thermal Expansion
NEET 2019 Physics Linear Expansion MCQ Question
Type: MCQ-numerical-Medium-Class 11
A copper rod of 88 cm and an aluminum rod of unknown length have their increase in length independent of increase in temperature. The length of aluminum rod is: (αCu = 1.7 × 10⁻⁵ K⁻¹ and αAl = 2.2 × 10⁻⁵ K⁻¹)
A
88 cm
B
68 cm
C
6.8 cm
D
113.9 cm
Correct Answer
Option B
Detailed Explanation
For equal expansion, L₁α₁ = L₂α₂. Substituting the given values, 88 * 1.7 × 10⁻⁵ = L₂ * 2.2 × 10⁻⁵, solving gives L₂ = 113.9 cm.
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