Junior Cert Science - Physics

Which one of the following statements is INCORRECT?
1. Density is the mass per unit volume of a substance
2. Density is the volume per unit mass of a material
3. Density may be measured in units of g/cm³
4. Density may be measured in units of kg/m³
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?
1. Mercury
2. Gold
3. Brass
4. Aluminium
If V = volume, D = density and M = mass of an object, then which one of the following relationships is correct?
1. M = D X V
2. D = M X V
3. V = M X D
4. M = D/V
If the density of paraffin oil is 0.8 g/cm³, what will be the mass of 10 cm³ of paraffin oil?
1. 8 g
2. 0.8 g
3. 10.8 g
4. 12.5 g
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?
1. 13.5 g/cm³
2. 4.5 g/cm³
3. 4050 g/cm³
4. 2.2 g/cm³
Which one of the following pieces of apparatus would you NOT use in measuring the density of a stone?
1. measuring cylinder
2. callipers
3. balance
4. overflow can
If copper floats on mercury, and gold sinks in mercury, the which one of the following statements is TRUE?
1. Mercury is denser than gold.
2. Copper is more dense than mercury.
3. Copper is less dense than gold.
4. Mercury is the least dense of the three metals.
Which one of the following statements is INCORRECT?
1. A solid object floats in a liquid if it is less dense than the liquid.
2. A steel ship will sink in seawater because its density is greater than the density of the seawater.
3. Different types of wood (e.g. mahogoney, pine, cork etc.), all of the same shape will all float at different depths in water.
4. The density of a submarine will determine if it floats submerged, or if it sinks in the 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?
1. A = mercury, B = water, C = cooking oil
2. A = cooking oil, B = water, C = mercury
3. A = cooking oil, B = mercury, C = water
4. A = water, B = cooking oil, C = mercury
A cube of mass 128 g has a density of 2 g/cm³. what is the length of each side of the cube?
1. 64 cm
2. 8 cm
3. 4 cm
4. 256 cm
Which of the following sets of apparatus would be most suitable for experimentally determining the density of a liquid?
1. beaker, balance, measuring cylinder and pipette
2. beaker, metre-stick, balance and callipers
3. beaker, pipette, callipers and measuring cylinder
4. beaker, callipers, measuring cylinder and balance
The table shows the masses and densities for four different substances. Which of these substances has the least volume?
1. A
2. B
3. C
4. D
The diagram shows four different substances which have been placed in a basin of water. Which one of the following statements is TRUE?
1. X is the least dense and Z is the most dense
2. X has the same density as the water, and W is the least dense
3. Z is the densest and Y is the second densest
4. Y is more dense than W and the density of X is equal to 1 g/cm³
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?
1. The density of the egg decreases as the egg goes stale.
2. Some of the contents of the egg escapes and increases the density of the water.
3. The density of the egg increases as it goes stale.
4. Some of the egg shell falls off which makes it lighter.
Four blocks of different metals, each had the same size and volume. They were weighed on a balance and their masses recorded in the table shown. Which one of these metals is the least dense?
1. A
2. B
3. C
4. D
In the photo shown, there is a person floating in the water of the Dead Sea. Why does this person not sink?
1. This person must be lying on a submerged airbed.
2. He is not a very heavy person.
3. The density of the saltwater is greater than the man's density.
4. His body is more dense than the density of the saltwater.
Which one of the following statements is CORRECT?
1. The density of an iceberg and seawater are equal.
2. The density of the iceberg is less than the density of the seawater.
3. The seawater's density must be less than that of the iceberg.
4. The iceberg contains a lot of trapped air which keeps the block afloat.
Which of the following metals will sink in a basin of mercury whose density is 13.6 g/cm³?
1. aluminium of density 2.7 g/cm³
2. iron of density 7.9 g/cm³
3. lead of density 11.3 g/cm³
4. uranium of density 19.5 g/cm³
Which one of the following is not a unit of density?
1. g/cm³
2. kg/m³
3. g/m³
4. kg/m
A measuring cylnder contains 100 ml of aliquid. The mass of the measuring cylinder and the liquid is 150 g. The mass of the empty measuring cylinder is 50 g. the liquid in the measuring cylinder is most likely to be
1. water
2. alcohol
3. mercury
4. cooking oil
Which one of the following conditions will cause the density of a liquid to decrease?
1. Heating the liquid
2. Cooling the liquid
3. Dividing the liquid into two equal volumes
4. Adding more of the liquid to the container
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?
1. 565 g
2. 4.4 g
3. 0.226 g
4. 61.3 g
Whether or not an objects floats in water will depend upon both its
1. mass and volume
2. length and mass
3. density and width
4. volume and colour
Why does a ship rise up in the water when it passes from a river to the sea?
1. The seawater is more dense than the water in the river.
2. The waves of the sea pushes the ship up in the water.
3. The ship is less sheltered from strong winds while at sea, and these winds push up the ship.
4. The ship lightens its load before going out to the sea.

Junior Cert Science - Physics - Density

Multiple-choice quiz