Third term review

The density of an object is

• The mass divided by the volume d = m/v

• The volume divided by the mass d = v/m

• The same as its weight

• The same as the space occupied by the object

If you cut a wooden block in half, each half would have

• Half the density of the original piece

• Twice the density of the original piece

• The same density as the original piece

• No density at all

If two objects have the same mass but different volumes

• The one with the larger volume has the lower density

• They must have the same density

• The one with the larger volume has the higher density

• The one with the larger volume is twice as dense

If the density of water is 1 gram/cm3 , this means that the mass of 100 cm3 of water should be

• 100 grams

• 50 grams

• 1000 grams

• 1 gram

A tiny piece of sand is very light but sinks in water. This is because

• Sand is a solid

• Sand is less dense than water

• There is more water than sand

• Sand is more dense than water

The density of hot and cold water are different mainly because

• The molecules in hot water move slower and are slightly closer together

• The molecules in hot water are larger

• The molecules in hot water move faster and are slightly further apart

• The molecules in cold water move faster and are further apart

What is the unit of specific gravity?

• kg/m3

• N/m3

• m/s2

• Dimensionless

What is the specific gravity of a substance with mass 10 kg and volume 2 m3, with respect to the reference density 50 g/m3?

• 0.1

• 0.2

• 0.3

• 0.4

If a block has dimensions 6 x 8 x 9 cm and the specific gravity is 2.3. What is the density?

• 2.3 gm/cm3

• 0.256 gm/cm3

• 2.659 gm/cm3

• .00568 gm/cm3

A material has a mass of 2 gms and a volume of 4 cm3. The material would _____ on water surface.

• Completely Float

• Completely Sink

• Partially Sink

• None of the above