Understanding Mass and Density

What is the primary difference between mass and weight?

• Mass is the weight of an object; weight is the amount of matter.

• Weight is a measure of volume; mass is a measure of density.

• Mass is the amount of matter; weight is the force of gravity on that mass.

• Mass changes with gravity; weight remains constant regardless of location.

How do you properly read the meniscus in a measuring cylinder?

• Read the top of the meniscus at eye level.

• Read the meniscus from below the cylinder.

• Read the bottom of the meniscus at eye level.

• Read the meniscus from a distance to avoid parallax errors.

What is the purpose of vernier calipers in measurement?

• To measure weight accurately.

• To determine the volume of liquids.

• To calculate temperature changes.

• To measure dimensions with high precision.

Convert 2.5 g/cm³ to kg/m³.

• 2000 kg/m³

• 3000 kg/m³

• 2500 kg/m³

• 250 kg/m³

If an object has a mass of 300 grams and a volume of 150 cm³, what is its density?

• 1 g/cm³

• 4 g/cm³

• 2 g/cm³

• 3 g/cm³

Explain how density is used in buoyancy calculations.

• Density is used to compare the density of an object with the density of the fluid to determine buoyancy.

• Density only affects the temperature of the fluid.

• Buoyancy is determined solely by the weight of the object.

• Density is irrelevant in buoyancy calculations.

What is the formula for calculating density?

• Density = Mass - Volume

• Density = Mass / Volume

• Density = Volume / Mass

• Density = Mass + Volume

How do you ensure accuracy when using a measuring cylinder?

• Use a clean cylinder, read at eye level, and ensure the meniscus is at the measurement line.

• Read from above the cylinder

• Ignore the meniscus completely

• Use a dirty cylinder

What is the significance of zero error in vernier calipers?

• Zero error is only relevant for digital calipers.

• Zero error indicates the caliper is broken and unusable.

• Zero error has no impact on the overall measurement process.

• Zero error is significant as it affects measurement accuracy in vernier calipers.

Describe a real-world application of density in engineering.

• Density is only important for underwater construction.

• Density is irrelevant in civil engineering projects.

• In aerospace engineering, density is used to select lightweight materials for aircraft structures to improve fuel efficiency.

• Density calculations are not used in material selection for buildings.