AP EAPCET 23-Aug-2021 Shift 1 Paper

As we know that,
Δl=l0αΔT
⇒α=

Δl

l0ΔT

where, Δ/ is change in length,
I0 is initial length,
ΔT is change in temperature
and α is coefficient of linear expansion.
Now,
∵αAl>αsteel
∴ΔlAl>Δlsteel
That means aluminium expands more than steel.