IGCSE Thermal Physics

A gas is stored in a sealed container of constant volume. The temperature of the gas increases. This causes the pressure of the gas to increase. What happens to the gas molecules during this pressure increase?

• The average kinetic energy of the molecules increases.

• The average separation of the molecules decreases.

• The average separation of the molecules increases.

• The volume of each molecule increases.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

The gas in a container is heated but is kept at constant volume.

Why does the gas pressure increase?

• The molecules expand

• The molecules increase in mass

• The molecules move further apart

• The molecules move more rapidly

Tags

NGSS.MS-PS1-4

Why does she feel cold even though the air is warm?

• The less energetic water molecules on her skin escape quickly

• The more energetic water molecules on her skin do not escape quickly

• The water on her skin does not evaporate quickly enough to keep her warm

• The water on her skin evaporates quickly and cools her skin

The diagram shows a beaker of water. Four molecules are levelled. The relative amount of energy of each molecule is shown.

Which molecule is most likely to escape from the liquid?

• Molecule A

• Molecule B

• Molecule C

• Molecule D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Which of the following is the specific heat capacity (cₚ) equation?

• cₚ = Q/mΔT

• Q = mΔT

• cₚ = mΔT/Q

• cₚ = mgh

Tags

NGSS.MS-PS3-4

The quantity of heat required to raise a unit mass of homogeneous material 1 °K or 1 °C in a specified way, given constant pressure and volume…

• Specific Heat

• Adhesion

• Cohesion

• Polarity

Tags

NGSS.MS-PS3-4

Suppose each of the following substances absorbs 100 J of energy. Which of the following substances will show the least increase in temperature?

• Lead - cₚ = 1.28 x 10²

• Glass - cₚ = 8.37 x 10²

• Iron - cₚ = 4.48 x 10²

• Water - cₚ = 4.186 x 10³

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the temperature of the sun's core?

• 15,000,000 Celcius

• 20,000,000 Celcius

• 15,000 Celcius

• 150,000 Celcius

What is the SI unit for specific heat?

• J/kg•ºC

• N/m²

• Q

• J•ºC

Tags

NGSS.MS-PS3-4

When energy changes forms some of it is lost usually as heat

• CERCLA

• The Second Law of Thermodynamics

• Law of conservation of energy

• Law of conservation of mass

Tags

NGSS.HS-PS3-4