Practise comparing thermal conductivity with heated-rod tests, controlled heating and observations of wax melting or temperature rise using CAIE IGCSE Physics questions and mark schemes.
A rod is made half of aluminium and half of glass.
A pin is attached to each end of the rod by wax.
The rod is heated at the centre.
A pin falls off when the wax melts.
Which statement is correct?
Pin P falls off first because aluminium is a better thermal conductor than glass.
Pin P falls off first because aluminium is a worse thermal conductor than glass.
Pin Q falls off first because glass is a better thermal conductor than aluminium.
Pin Q falls off first because glass is a worse thermal conductor than aluminium.