Science Concepts for Grade 4

What is absorbency?

• Absorbency is the capacity of a material to soak up liquid.

• Absorbency is the ability to repel water.

• Absorbency refers to the weight of a material.

• Absorbency is the speed at which a liquid evaporates.

Which material is most absorbent: sponge, plastic, or metal?

• sponge

• rubber

• wood

• glass

How do you measure the mass of an object?

• Weigh the object using a ruler.

• Use a balance scale or digital scale to measure the mass.

• Use a thermometer to measure the mass.

• Estimate the mass by its volume.

If a rock weighs 200 grams, what is its mass?

• 200 milliliters

• 150 grams

• 200 grams

• 250 grams

What is density?

• Density is mass per unit volume.

• Density is the volume of an object divided by its mass.

• Density is the temperature of a substance.

• Density is the weight of an object.

How do you calculate density?

• Density = Volume / Mass

• Density = Mass - Volume

• Density = Mass + Volume

• Density = Mass / Volume

If an object has a mass of 50 grams and a volume of 10 cm³, what is its density?

• 10 g/cm³

• 2 g/cm³

• 0.5 g/cm³

• 5 g/cm³

What happens to an object with a density less than water?

• The object will evaporate.

• The object will sink.

• The object will float.

• The object will dissolve in water.

What does it mean for an object to float?

• An object floats when its density is less than the density of the fluid it is in.

• An object floats when it is submerged completely in water.

• An object floats when it is heavier than the fluid.

• An object floats when it is made of rubber.

What does it mean for an object to sink?

• An object sinks when it is denser than the fluid it is in.

• An object sinks when it is filled with air.

• An object sinks when it is the same density as the fluid it is in.

• An object sinks when it is lighter than the fluid it is in.