Due to thermal expansion, with rise in temperature

Options

A. metallic scale reading becomes lesser than true value (alpha of the metal is greater then alpha of the object)
B. Pendulum clock becomes slower
C. A floating body sinks a little more (assuming temperature of liquid remains unchanged)
D. The apparent weight of a body in a liquid may decrease (assuming temperature of liquid remains unchanged)

Answer

A, B, D

Explanation

`L_(ob)=L_(act)[1+alphaDeltaT]`
`T=2pisqrt(L/g) (T')/T=sqrt(1+alphaDeltaT)=1+1/2alphaDeltat`
`T'-T/T=1/2alphaDeltat`

`F=mg-F_(B) F=mg-(rho_(L))/(1+gamma_(L)DeltaT) V_(s)(1+gamma_(S)DeltaT)g`
Weight of body in liquid increases `F=mg-rho_(L)V_(S)g F gt F`
`f/f = (1+gamma_(L)DeltaT)/(1+gamma_(S)DeltaT)`