Chapter 5 Thermal Energy Lesson 2

Multiple Choice

Which of the following is NOT a use of electromagnetic waves?

• Transmitting heat from radiators

• Broadcasting radio and television

• Absorbing by the skin

• Growing plants without sunlight

Multiple Choice

Which of the following best explains why the handle of a metal pan gets hot when placed over a flame?

• Thermal energy is transferred from the flame to the handle by conduction.

• Thermal energy is transferred from the handle to the flame by convection.

• The handle emits thermal energy through radiation.

• The handle absorbs energy only from the air.

Multiple Select

Which of the following materials are good thermal conductors?

• Metals

• Cloth

• Copper

• Wood

Fill in the Blanks

The amount of thermal energy required to raise the temperature of 1kg of a material by 1 degree Celsius is called

Multiple Choice

Why do sidewalks have joints in them?

• To allow the concrete to expand in high temperatures without cracking.

• To make the sidewalks look more attractive.

• To reduce the cost of construction.

• To prevent water from seeping in.

Multiple Choice

What is the purpose of ovenproof glass in comparison to regular glass?

• It is designed to expand less and resist cracking when heated.

• It is lighter than regular glass.

• It is more transparent than regular glass.

• It is cheaper to produce than regular glass.

Multiple Choice

How does thermal expansion and contraction contribute to the movement of fluids in convection currents?

• Thermal expansion makes the fluid denser, causing it to sink, while contraction makes it less dense, causing it to rise.

• Thermal expansion makes the fluid less dense, causing it to rise, while contraction makes it denser, causing it to sink.

• Thermal expansion and contraction have no effect on fluid movement.

• Thermal contraction makes the fluid less dense, causing it to rise, while expansion makes it denser, causing it to sink.

Multiple Choice

Which of the following is NOT a use of electromagnetic waves shown in the image?

• Used to broadcast radio and television

• Used to cook food in a microwave

• Used to transmit heat from radiators

• Used to grow plants underwater