Question

Please solve the following:- { Choose the correct}
(The first one is this and solve the other by attachment)

1. When a bimetallic strip (brass and invar) is heated :

$(a) it \: remains \: straight \\ (b) \: it \: bents \: with \: brass \: on \: convex \: side \\ (c) \: it \: bends \: with \: invar \: on \: convex \: side \\ (d) \: it \: does \: not \: have \: a \: definite \: shape$
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Answer 1

Explanation:

2.pendulum clock

3.three types

4. Oringinal suface area of the body