Which statement about the pressure in a column of liquid is correct? 

• It acts only vertically downwards. 
• It increases if the column width increases. 
• It increases with depth in the column. 
• It is uniform throughout the column. 

An airtight container holds a fixed quantity of gas. Its pressure and volume are measured on four occasions when the temperature is 20 °C. The results are shown in the table. Which set of readings is incorrect? 

• A
• B
• C
• D

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

• conduction only 
• convection only
  
• conduction and convection only
  
• conduction, convection, and radiation 

Ice is taken from a freezer and left in a room. The ice melts and eventually the water reaches room temperature.
Which energy transfers take place? 

• A
• B
• C
• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Some air is trapped inside a small balloon. The average kinetic energy of the air molecules in the balloon is increased. What remains the same? 

• the density of the air in the balloon 
• the mass of the air in the balloon 
• the temperature of the air in the balloon 
• the volume of the air in the balloon 

Tags

NGSS.HS-PS3-4

A substance that is originally a solid is heated strongly for some time.
At one stage, the energy given to the substance is used as latent heat of vaporisation. At this stage, what change does the energy cause? 

• It breaks the bonds holding the molecules together. Molecules escape from the liquid. 
• It breaks the bonds holding the molecules together. The solid becomes liquid. 
• It makes the molecules move faster but there is still a strong attraction between them. 
• It makes the molecules move faster and so the temperature rises. 

Tags

NGSS.MS-PS1-4

What happens when a metal bar is heated? 

• The distance between the molecules increases, making the bar longer. 
• The molecules get larger, making the bar longer. 
• The molecules vibrate more quickly, making the bar denser. 
• The speed of the molecules increases, making the bar thinner. 

Tags

NGSS.HS-PS3-2

A fixed mass of gas at constant temperature is compressed to reduce its volume. How do the molecules of gas now strike the walls of the container? 

• less often than before with a higher velocity 
• less often than before with the same velocity 
• more often than before with a higher velocity 
• more often than before with the same velocity 

An ice-cube has a mass of 7.50 g. The ice-cube is at 0 °C. Heat from the surroundings reaches the ice-cube at an average rate of 1.25 J / s. How long does it take for all of the ice to melt? (specific latent heat of fusion of ice = 333 J / g) 

• 35.5s 
• 55.5s 
• 2000s 
• 3120s 

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-4

According to the kinetic theory, matter is made up of very small particles in a constant state of motion. Which row best describes the particle behaviour in the liquid state? 

• A
• B
• C
• D