question_answer 23)

                A bimetallic strip is made of aluminium and steel \[({{\alpha }_{Al}}\,>\,{{a}_{steel}})\]. On heating, the strip will                 (a) remain straight                 (b) get twisted                 (c) will bend with aluminimum on concave side.                 (d) will bend with steel on concave side.                

Answer:

                (d) Since  \[{{\alpha }_{Al}}>\,{{\alpha }_{steel}},\] so aluminium strip will expand more than that of steel.