Grade 7 Physics Quiz

What is the SI unit of density?

• m/s^2

• g/cm^3

• kg/m^3

• N/m^2

What is the formula for calculating density?

• Density = Mass/Volume

• Density = Volume/Mass

• Density = Weight/Volume

• Density = Mass x Volume

What are the units for mass and volume in the formula for density?

• inches/feet

• pounds/ounces

• miles/gallons

• grams/cubic centimeters or kilograms/liters

What is the density of water in g/cm^3?

• 1

• 2

• 3

• 0.5

How does the density of an object change if its mass increases but its volume remains the same?

• Density decreases

• Density remains the same

• Density increases

• Density becomes negative

Explain why a ship made of steel can float on water even though steel is denser than water.

• Because steel is lighter than water

• Because the ship is filled with air which makes it lighter than water

• Buoyancy principle

• Due to the magnetic force between steel and water

What is the density of an object if it has a mass of 50g and a volume of 10cm^3?

• 10 g/cm^3

• 20 g/cm^3

• 5 g/cm^3

• 15 g/cm^3

How does the density of a substance affect its ability to float or sink in water?

• The shape of the substance determines whether it will float or sink in water.

• The temperature of the water determines whether the substance will float or sink.

• The density of a substance determines whether it will float or sink in water.

• The color of the substance determines whether it will float or sink in water.

What is the relationship between density and buoyancy?

• Unrelated to each other

• No relationship

• Inverse relationship

• Direct relationship

Explain how the concept of density is used in everyday life.

• Density is used to determine the speed of sound in different materials

• Density is used to calculate the distance between two points

• Density is used to measure the brightness of light sources

• Density helps in understanding the mass and volume of different materials and substances.