PQAM - 3

Take two similar bags. Fill one with sand and the other with cotton. Which one would feel heavier, and why does the bag of sand feel heavier even though both bags have the same volume?

• The bag of sand feels heavier because sand is denser than cotton.

• The bag of cotton feels heavier because cotton is denser than sand.

• Both bags feel the same because they have the same volume.

• The bag of sand feels lighter because sand takes up less space.

Take an iron nail or a metal bar and weigh it. Now, take pieces of wood or thermocol until you get the same mass. Which of the following is true when you compare their volumes?

• The volume of wood or thermocol is greater than that of the iron nail or metal bar.

• The volume of iron nail or metal bar is greater than that of wood or thermocol.

• Both have the same volume.

• The volume of wood or thermocol is less than that of the iron nail or metal bar.

Take a bag and fill it with sand until it weighs 500 g. Now, take some newspaper in a similar bag and weigh out exactly 500 g. You will notice that the newspaper has more volume than sand for the same mass. What does this experiment demonstrate?

• Newspaper has a lower density than sand

• Sand has a lower density than newspaper

• Both have the same density

• Sand has more volume than newspaper for the same mass

What is the property of the material which tells us how much mass has been packed in a certain amount of space called?

• Density

• Elasticity

• Conductivity

• Viscosity

Define density.

• Density is defined as the mass of a substance present in a given volume.

• Density is defined as the weight of a substance present in a given area.

• Density is defined as the volume of a substance present in a given mass.

• Density is defined as the temperature of a substance present in a given volume.

What is the SI unit of density?

• kg/m³

• g/cm³

• kg/L

• g/L

To calculate the density of a regular solid, the mass is measured using a balance and the volume is calculated using the standard formula.

• True

• False

The formula for density is:

• Density = Mass × Volume

• Density = Mass / Volume

• Density = Volume / Mass

• Density = Mass + Volume

The density of an irregular solid can be calculated by dividing its mass by its volume.

• True

• False

What is the formula to find the density of a solid?

• Density = Mass / Volume

• Density = Volume / Mass

• Density = Mass x Volume

• Density = Mass + Volume