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The figure below shows four isotropic solids having positive coefficient of thermal expansion. A student predicts that on heating the solid following things can happen. Mark true (T) or False (F) for comments made by the student.
(i) The angle $α$ in figure (1) will not change.
(ii) The length of line in figure (2) will decrease.
(iii) The radius of inner hole will decrease.
(iv) The distance AB will increase.

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T F F T

F T T F

T T T T

F F T F

answer is A.

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Detailed Solution

T F F T

(i) Expansion is along the length (ii) length of the line increases along with the disc, (iii) radius of the hole increases on expansion and gap increases due to heating.

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