$A$ piece of glass is heated to a high temperature and then allowed to cool. If it cracks,a probable reason for this is the following property of glass:

  • A
    Low thermal conductivity
  • B
    High thermal conductivity
  • C
    High specific heat
  • D
    High melting point

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Define heat transfer in solids.

The temperature of the hot and cold ends of a $20 \ cm$ long rod in a thermal steady state are at $100^\circ C$ and $20^\circ C$ respectively. The temperature at the centre of the rod is ...... $^\circ C$.

For heat to flow from one end to the other in a solid,it is necessary to have:

When two ends of a rod wrapped with cotton are maintained at different temperatures and after some time every point of the rod attains a constant temperature,then

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