21. Which of the following objects would have the lowest density?
a) Gold
b) Silver
c) Copper
d) Aluminum
Answer: d) Aluminum
22. The density of a substance is defined as its:
a) Weight per unit volume
b) Volume per unit weight
c) Mass per unit volume
d) Volume per unit mass
Answer: c) Mass per unit volume
23. Which of the following materials would be considered the least dense?
a) Cork
b) Styrofoam
c) Plastic
d) Wood
Answer: b) Styrofoam
24. The density of an object is 4 g/cm³. If the mass of the object is 20 grams, what is its volume?
a) 4 cm³
b) 5 cm³
c) 10 cm³
d) 80 cm³
Answer: c) 10 cm³
25. Which of the following substances would be considered the least dense?
a) Water
b) Oil
c) Alcohol
d) Mercury
Answer: b) Oil
