MCQss!!! Part 2

6. The diagram shows four similar cans. Each can contains the same volume of water initially at 80 degree celcius. After five minutes.which can will contain the coolest water?

7. In a vacuum flask, which methods of heat transfer are prevented by the vacuum?

A conduction only

B convection only

C conduction and convection only

D conduction, convection and radiation

8. A teacher has a large tank of water in which he wants to set up a convection current.

Which of the following arrangements would do this?

A cooling at X

B cooling at Y

C heating atY

D heating at Z

9. Three blocks, at temperatures T1, T2, and T3, are in good thermal contact.

At which temperatures are the blocks in thermal equilibrium? 10. Four beakers containing the same amount of water at the same temperature are placed on hot metal plates. The lower surfaces of the metal plates are kept at the same temperature.

The plates are all the same size but are made from four different metals

The time taken to produce stated temperature rises of the water are given below.

Which metal is the poorest conductor?