Just check my answers no need of explanation. For wrong answer pl explain. Chapter -combesion and flame

Solution
All your answers are correct.
ans 1, Thermal conductivity of brass is more than that of wood, this is the reason why brass tumbler seems cool than wooden tray.
Ans 2, Air packets serve as insulators in snow so it is good insulator.
Ans 3, Convection is not possible in space, so assertion is false.