Density Quiz

What is the density of a substance a measure of?

• Its volume per unit mass

• Its mass per unit volume

• Its weight per unit volume

• Its volume per unit weight

Answer explanation

The density of a substance is a measure of its mass per unit volume, making the correct answer choice 'Its mass per unit volume'.

Which symbol is used to represent density in the given equation?

• λ (lambda)

• ρ (rho)

• δ (delta)

• γ (gamma)

Answer explanation

The symbol used to represent density in the given equation is ρ (rho).

What is the common unit for expressing density as seen in the document?

• kg/m³

• g/cm³

• lb/ft³

• oz/in³

Answer explanation

The common unit for expressing density as seen in the document is g/cm³, which stands for grams per cubic centimeter.

Before measuring the mass of an object using an electronic balance, what must be done?

• The balance must be heated

• The balance must be zeroed and placed on a stable level surface

• The balance must be calibrated with a standard weight

• The balance must be connected to a power source

Answer explanation

Before measuring the mass of an object using an electronic balance, the balance must be zeroed and placed on a stable level surface.

What is the formula for calculating the volume of a cuboid?

• V = l + b + h

• V = l / b / h

• V = l × b × h

• V = l - b - h

Answer explanation

The correct formula for calculating the volume of a cuboid is V = l × b × h, where l is the length, b is the breadth, and h is the height.

Where should the volume of a liquid in a measuring cylinder be read from?

• The top of the liquid

• The bottom of the meniscus

• The middle of the liquid

• The top of the meniscus

Answer explanation

The volume of a liquid in a measuring cylinder should be read from the bottom of the meniscus, as this is the point where the liquid level is most accurate.

What is the displacement method used for?

• Measuring the volume of a liquid

• Measuring the volume of an irregular shaped object

• Measuring the weight of an object

• Measuring the density of a liquid

Answer explanation

The displacement method is used for measuring the volume of an irregular shaped object, as it involves submerging the object in a liquid and measuring the volume of liquid displaced.

What condition must be met for an object to be measured using the displacement method?

• The object must be lighter than water

• The object must be completely dry

• The object must be denser than water

• The object must be soluble in water

Answer explanation

The correct condition for an object to be measured using the displacement method is that the object must be denser than water.

What is a eureka can used for?

• To measure the volume of a liquid by displacement

• To measure the volume of an object too big for a measuring cylinder

• To measure the weight of a large object

• To measure the density of a solid object

Answer explanation

A eureka can is used to measure the volume of an object too big for a measuring cylinder, making it the correct choice.

How is the volume of an object determined using a eureka can?

• By the weight of the water displaced

• By the change in water level in the can

• By the volume of water caught in the measuring cylinder

• By the height of the object in the can

Answer explanation

The volume of an object is determined using a eureka can by measuring the volume of water caught in the measuring cylinder.