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2.3.1a Thermal conductors and thermal insulators

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Question 49

An industrial food warmer uses two different methods to keep metal dishes hot:

Method 1: A solid metal heating plate is clamped directly against the bottom of a metal dish, leaving no air gap.

Method 2: A halogen lamp underneath a glass top glows brightly to heat the bottom of a metal dish placed on the glass top.

Which statement is correct?

A

In Method 1, energy is transferred to the metal dish primarily by convection.

B

In Method 2, energy is transferred through the glass top to the dish by convection.

C

In Method 1, energy is transferred to the metal dish by conduction.

D

In Method 2, the halogen lamp transfers less energy by radiation than the metal heating plate in Method 1.

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2.3.1a Thermal conductors and thermal insulators Questions

  1. IGCSE
  2. /Physics
  3. /2.3.1a Thermal conductors and thermal insulators

67 exam-style questions on CIE IGCSE Physics 2.3.1a Thermal conductors and thermal insulators. Each one has a worked solution and a mark scheme showing where the marks go.

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