A brass rod of length 1 m at 0°C expands by 0.0019 m when heated to 100°C. Its linear expansion coefficient is MCQ with Answer and Explanation

A brass rod of length 1 m at 0°C expands by 0.0019 m when heated to 100°C. Its linear expansion coefficient is
A. 1.9 × 10⁻⁵ /°C
B. 1.9 × 10⁻⁶ /°C
C. 1.9 × 10⁻⁴ /°C
D. 1.9 × 10⁻³ /°C
Answer: Option A
Solution (By JKSSB Mock Tests)
ΔL = α L₀ ΔT => α = ΔL/(L₀ ΔT) = 0.0019/(1×100) = 1.9×10⁻⁵ /°C. Typical for brass. Unit is per °C. Always check ΔL/L per °C.

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