Doubt from thermodynamics

Q8


Q5,Q6
Q1 option C explain ...last word is steady state is reached.
Q10,Q11,Q12

Q2, options are on next page

For question no 8

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For Q 5
Thermal radiation is directly proportional to 4th power of temperature.
For Q 6
In steady state no heat transfers so T must be constant

For Q 6 I got it wrong first
At the steady state the end near the furnace is hotter than the end far from the furnace
Same logic is applicable for Q1

Q10


T_a<T_b

As initial temp. =final Temp.
So change in internal energy is zero