Worksheets29. Density and Buoyancy
Total questions: 67
Worksheet time: 53mins
Which is heavier?
Air or copper.
It depends on the volume of each being considered.
Copper, of course.
It depends on the temperature and pressure of each substance.
Air
The photo shows an underwater view of a swimmer competing in a race.
The force that acts upwards on the swimmer in the water is known as
(a)
The photo shows some toy wooden blocks.
All types of wood have the same density.
false
true
Butter has a density of 0.87 grams per centimetre cubed. A lump of butter is thrown into a river.
The butter will float.
true
false
Which one of the following statements is incorrect?
Density is the volume per unit mass of a material.
Density is the mass per unit volume of a substance.
Density may be measured in units of g/cm³.
The S.I. unit of density is the kilogram per metre cubed.
There are two commonly used units of density.
Which one of the following is not a unit of density?
Grams per metre squared
Kilograms per metre cubed
Grams per centimetre cubed
Complete the following sentence:
Density is mass per unit (a) .
The masses and volumes of four different metals were measured in an experiment and entered in a table as shown. Which of these metals has the greatest density?
[You may need a calculator]
Gold
Aluminium
Mercury
Brass
The table shows the masses and densities for four different substances.
Which of these substances has the least volume?
[You may need a calculator]
C
A
B
D
The bar chart shows the densities of five different metals. Blocks of each metal, each of the same volume and shape were weighed on a mass balance.
Which one of them has the greatest mass?
Lead
Aluminium
Iron
Copper
Magnesium
The bar chart shows the densities of five different metals. Blocks of each metal, each of the same volume and shape were weighed on a mass balance.
Which one of them has the greatest mass?
Magnesium
Iron
Copper
Aluminium
Peter and Maura carried out an experiment to measure the buoyancy force on a stone in water.
They weighed a stone separately in air and water, and got the following results:
Weight of stone in air = 1.25 N
Weight of stone in water = 0.95 N
What is the buoyancy force (upthrust) acting on the stone?
0.3 N
3 N
2.2 N
-2.2 N
The picture shows an iceberg floating partly submerged in the Arctic Ocean.
Which one of the following statements is correct?
The density of the iceberg is less than the density of the seawater.
The density of an iceberg and seawater are equal.
The seawater's density must be less than that of the iceberg.
The iceberg contains a lot of trapped air which keeps the block afloat.
A Greek mathematician over 2000 years ago stated that when an object is immersed in a liquid the apparent loss of weight of the object is equal to the upthrust.
Who was this mathematician?
Archimedes
Aristotle
Pythagoras
Alexander the Great
When learning to swim, a boy finds it easier to do so at the beach rather than in a swimming pool.
Why is this?
Seawater is more buoyant than water in a swimming pool.
There is more chlorine in the swimming pool water.
He is heavier in the swimming pool.
The water in the swimming pool is warmer.
The photo shows a brass block floating in a beaker of mercury.
If brass floats on mercury, and gold sinks in mercury, then which one of the following statements is true?
Brass is less dense than gold.
Mercury is denser than gold.
Brass is more dense than mercury.
Mercury is the least dense of the three metals.
Which one of the following statements is incorrect?
A steel ship will sink in seawater because its density is greater than the density of the seawater.
Different types of wood (e.g. mahogany, pine, cork etc.), all of the same shape will all float at different depths in water.
The density of a submarine will determine if it floats submerged, or if it sinks in the water.
A solid object floats in a liquid if it is less dense than the liquid.
Olive oil is a liquid whose density is 0.92 g/cm3, and is immiscible with water.
Olive oil and water are placed in a beaker.
Which of these liquids will float on top?
Olive oil
Neither. They are mixed together
Water
Steel has a density of 7.9 g/cm³, while mercury has a density of 13.6 g/cm³.
A small piece of steel is placed in a basin of mercury.
Does the steel sink or float on the mercury?
Float
Sink
Neither
The diagram shows four different substances which have been placed in a basin of water.
Which one of the following statements is true?
X has the same density as the water, and W is the least dense.
W is more dense than Y and the density of X is equal to 1 g/cm³.
X is the least dense and Z is the most dense.
Z is the densest and Y is the second densest.
A carrot slice sinks in liquid A and floats in liquid B.
Which liquid is more dense?
B
A
Both A and B are equally dense.
A swimmer finds it easier to swim in seawater rather than 50 kilometres upstream in a river.
Which of the following statements is correct?
The upthrust on the swimmer in seawater is greater.
The upthrust on the swimmer in freshwater is greater.
The upthrust on the swimmer increases as he swims inland up the river.
The upthrust on the swimmer is the same for seawater and freshwater.
A tea light candle is placed in a beaker of water and floats, while a second similar tea light candle is placed in a beaker of cooking oil and sinks.
Which one of the following statements is true?
Water is more dense than cooking oil.
The cooking oil is more dense than the candle.
Cooking oil is denser than water.
The candle is more dense than water.
Three liquids of different densities are placed in a measuring cylinder as shown.
Which one of the following is most likely to be correct?
A = cooking oil, B = water, C = mercury.
A = mercury, B = water, C = cooking oil.
cooking oil, B = mercury, C = water.
A = water, B = cooking oil, C = mercury.
A = water B = mercury C = cooking oil.
A steel nail (density = 8 g/cm3), water and mercury (density = 13.6 g/cm3) are placed in a large beaker.
Where will the steel nail settle?
Between the water and mercury.
At the very top.
At the very bottom of the beaker.
A fresh egg will sink to the bottom of a saucepan of water, while a stale egg will move to the surface of the water.
How is this best explained?
The density of the egg decreases as the egg goes stale.
Some of the contents of the egg escapes and increases the density of the water.
The density of the egg increases as it goes stale.
Some of the egg shell falls off which makes it lighter.
20 centimetres cubed of aluminium has a mass of 54 grams.
How many grams will 30 centimetres have?
81 grams
2.7 grams
5.4 grams
36 grams
The photo shows brass (density = 8.73 g/cm³) floating in mercury.
Which one of the metals below will sink in a basin of mercury whose density is 13.6 g/cm³?
Uranium of density 19.5 g/cm³
Lead of density 11.3 g/cm³
Aluminium of density 2.7 g/cm³
Iron of density 7.9 g/cm³
The density of lead is 11.3 g/cm³.
If a lead bar has a volume of 50 cm³, what is the mass of the lead bar?
565 g
61.3 g
4.4 g
0.226 g
A block of ash wood has a mass of 1 kilogram, and occupies a volume of 0.00125 m3.
What is its density?
800 kg/m³
1.00125 kg/m³
0.00125 kg/m³
0.8 kg/m³
A stone of mass 90 grams has a volume of 30 centimetres cubed.
What is its density?
3 grams per centimetre cubed
2700 grams per centimetre cubed
0.33 grams per centimetre cubed
120 grams per centimetre cubed
A measuring cylinder is filled with 100 cm³ of a liquid.
The mass of the empty measuring cylinder is 50 g.
The mass of the measuring cylinder and the liquid is 150 g.
The liquid in the measuring cylinder is most likely to be
water
mercury
cooking oil
alcohol
A six-sided dice for a board game has a mass of 10.4 grams and each side has a length of 20 mm.
What is its density?
1.3 g/cm³
0.769 g/cm³
0.0013 g/cm³
30.4 g/cm³
Four blocks of different metals, each of the same size and volume were weighed on a balance and their masses recorded in the table shown.
Which one of these metals is the least dense?
B
A
C
D
The density of silver is 10.5 g/cm3.
What is the approximate mass of 0.5 cm³ of silver to the nearest whole number?
5 grams
10 grams
11 grams
6 grams
Study the chart of densities of different metals.
Which one of these metals would have a volume of 0.75 cm³ and a mass of 14.5 grams?
Gold
Copper
Platinum
Iron
In an experiment to determine the density of a metal block, the following results were obtained:
Length of block = 5 cm
Width of block = 2 cm
Height of block = 3 cm
Mass of block = 135 g
What is the density of the metal?
4.5 g/cm³
2.2 g/cm³
4050 g/cm³
13.5 g/cm³
The density of pure water is 1 g/cm.
What is this in units of kg/m3?
1000
100
10
0.001
The apparatus shown is known by different names.
Which one of the following is not one of these names?
Tin can
Eureka can
Overflow can
Displacement can
A group of students were asked to find the density of a large stone:
They were asked by the teacher to fetch their apparatus from the cupboard.
Which three of the following should they select in order to carry out the experiment?
Overflow can
Graduated cylinder
Mass balance
Thermometer
Bunsen burner
Which one of the following would you not use to measure the density of a liquid?
A student was asked to determine the density of an apple, but found that it floated in the water and its volume could not easily be determined.
Explain how the volume of the apple can be measured.
Pressing down on the apple with a knitting needle until it is just under the water.
Measure the diameter of the apple using a callipers and calculate its volume using the formula
Measure the volume of water in the measuring cylinder and double it.
Place a weight of one newton on the apple.
If the density of steel is 8.05 g/cm³, what volume of steel will have a mass of 322 grams?
Give your answer in cm³.
[You may need a calculator]
(a)
The density of aluminium is 2.7 grams per centimetre cubed.
What mass will a volume of 200 cm3 of aluminium have?
Give your answer in grams.
(a)
A cube of mass 128 g has a density of 2 g/cm³.
What is the length of each side of the cube in centimetres?
(a)
