IGCSE Thermal Physics

What causes the random, zig-zag movement (Brownian motion) of smoke particles suspended in air? 

• air molecules colliding with smoke particles 

• convection currents as the hot smoke rises 

• smoke particles colliding with each other 

• smoke particles reacting with oxygen molecules in the air 

Tags

NGSS.MS-PS2-2

Evaporation...

• Happens to every molecule in a boiling liquid

• Only happens to the particles at the surface

• Will increase with a smaller surface area

• Is the same as boiling

Which substance expands most when heated?

• Solid

• Liquid

• Gas

• All the same

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which colour absorbs the most heat?

• Black

• White

• Yellow

• Silver

Which of these is the correct equation for specific heat capacity?

• E= mcT

• E= mc/T

• E= m/cT

• E= m/c/T

A mass of 5kg takes 2000J of energy to change its temperature from 40ºC to 50ºC. What is the specific heat capacity?

• 10 J/kgºC

• 20 J/kgºC

• 30 J/kgºC

• 40 J/kgºC

Which of these is the best reflector of infrared radiation?

• dark, matt surfaces

• dark, shiny surfaces

• light, matt surfaces

• light, shiny surfaces

Tags

NGSS.MS-PS4-2

Which two of these are examples of convection currents?

• the water cycle

• a heater warming up air in the corner of a room

• the lunar cycle

• heat travelling along a solid metal bar

Tags

NGSS.MS-ESS2-6

The diagram shows electricity cables being put up on a warm day. The cables are left loose between the poles, as shown in the diagram. Why are the cables left loose?

• They will contract on cold days.

• They will contract on very warm days.

• They will expand on cold days.

• They will expand on very warm days.

The graph shows how the temperature of the substance changes with time.

• gas condensing

• gas cooling

• liquid cooling

• liquid solidifying

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5