When a metal ring is heated

When a metal bar is heated, the increase in length is greater, if

When a metal rod is heated it expands because

When a metal is heated, its resistance

When a metal is heated, it emits predominantly

When a metal sphere is heated, then the maximum percentage change will be observed in its

When zinc metal is heated with caustic soda solution, the gas evolved is

When a metal ring having some gap is heated (a) length of gap increases (b) radius of the ring decreases (c) the angle substanded by the gap at the centre remains same (d) length of gap decreases