Due to thermal expansion with rise in temperature:

Options

A. metallic scale reading becames lesser that true value
B. pendulum clock becomes fast
C. a floating body sinks a little more
D. the weight of a body in a liquid increases

Answer

A, C, D

Explanation

a. If `theta^(`)gttheta`, Then Scale reading`lt`true value
b. `Deltat=(1)/(2)alphaDeltat`
If `theta^(`)gttheta` or `theta` is positive i.e., clock will lose time i.e., will become slow. Hence not correct.
c. With rise in temperature upthrust decreses. As weight remains same, hence, a floating body sinks a littele more.
d. As upthrust on the body decreases with rise in temperature hence, weight of a body in a liquid`(W_0-th)` increases.