An aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at 30^{\circ} C. The coefficient of linear expansion of aluminium and steel are 24 \times 10^{-6} \/{ }^{\circ} C and 1.2 \times 10^{-5} \/{ }^{\circ} C, respectively. The length of this composite rod when its temperature is raised to 100^{\circ} C, is \_\_\_\_ cm . [21 Jan 2026 Shift 1]

Properties of Matter Part 3

Section: Physics

Question : 13 of 92

Marks: +1, -0

An aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at 30∘C. The coefficient of linear expansion of aluminium and steel are 24×10−6∕‌∘C and 1.2×10−5∕‌∘C, respectively. The length of this composite rod when its temperature is raised to 100∘C, is ____ cm .

[21 Jan 2026 Shift 1]

120.20
120.06
120.15
120.03

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