Due to thermal expansion with rise in temperature
    a)    Metallic scale reading becomes lesser than true value
    b)    Pendulum clock goes fast
    c)    A floating body sinks a little more
    d)    The weight of a body in a liquid increases

(A) Due to heating, length of each subdivision of a metal scale increases. As a result measured length will be less than true length. 

(B) Time period of a pendulum clock is: $\mathrm{T} = 2\mathrm{\pi }\sqrt{\frac{\mathrm{L}}{\mathrm{g}}}$. Due to heating L increases and so T increases and hence the clock will go slow.

(C) Buoyant force, $\mathrm{B} = {\mathrm{\rho }}_{\mathrm{L}}{\mathrm{V}}_{\mathrm{L}}\mathrm{g}$. Due to rise in temperature ${\mathrm{\rho }}_{\mathrm{L}}$decreases. Since weight of the body remains the same, for a floating body, volume of displaced liquid (v_l) must increase and the body will sink.

(D) For a completely submerged body, buoyant force at temperature t is:
$B_t=B_o\left[1-\left({\delta }_l-{\delta }_s\right)\mathrm{\Delta }t\right]$. Since, ${\delta }_l>{\delta }_s$, we conclude B_t < B_o. Hence weight of the body in the liquid increases.