2nd secondary 2nd quiz

Two spheres have the same mass, but the second sphere has a volume half as big as the first. How much greater is the density of the second sphere than that of the first sphere?

• 1

• 2

• 4

• 8

A cube has a mass of 30 kg.If the volume of the cube is 0.02 m³,what is its density?

• 3000Kg/m³

• 5000Kg/m³

• 1500Kg/m³

• 10Kg/m³

A bowling ball has a mass of 5.5 kg.The bowling ball is a sphere with a radius of 7 cm.What is the density of the bowling ball? Give your answer to the nearest kilogram per cubic metre.

• 3800kg/m³

• 800kg/m³

• 300kg/m³

• 380kg/m³

Two spheres have the same density, but the first sphere has a volume 10 times greater than that of the second. How much greater is the mass of the first sphere than that of the second sphere?

• 20

• 30

• 40

• 10

A cuboid made of iron has a width of 12 cm,a length of 10 cm,a mass of 0.5 kg,and a density of 7.9 g/cm³.Its height is .

• 5.27 cm

• 2.64 cm

• 0.53 cm

• 0.06 cm

A metallic alloy of mass 820 g is made of copper and silver such that 75% of its mass is copper and the rest is silver. If the density of copper is 9 g/cm³ and the density of silver is 10.5 g/cm³,calculate the density of the alloy.

• 9.75 g/cm³

• 19.5 g/cm³

• 9.33 g/cm³

• 10.08 g/cm³

A cube of volume 𝑉 is made of a material which has a density 𝜌.If a smaller cube of volume 1/4𝑉 is cut from the larger cube, calculate the ratio of the density of the smaller cube to the density of what remains of the larger cube.

• 1

• 1/4

• 4

• 1/3

The table shows the density of some materials at the same temperature. If we have one kilogram of each material, which of them will have the smallest volume?

• Silver

• Aluminium

• Iron

• Tungsten

• 2

• 1/2

• 4

• 1/4

If a cubic container that has a side length of 15 cm is filled with oil, then the mass of the oil equals ,given that the density of oil is 780 kg/m³.

• 0.23 kg

• 117 kg

• 2.63 kg

• 17.55 kg