Choosing questions of Science (Please help me!) (10)

Question

1. Which object can float in water(density=1.0g/cm3) ?
a.Object X of mass 0.9g
b.Object Y of mass 1.1g
c.Object Z of mass 1.3g
d.Cannot be determined

2.Which object can float in water(density=1.0g/cm3) ?
a.Object R of volume 0.9cm3
b.Object S of volume 1.1cm3
c.Object T of volume 1.3cm3
d.Cannot be determined

3. Which object can float in water(density=1.0g/cm3) ?
a.Object I of density 0.9g/cm3
b.Object J of density 1.1g/cm3
c.Object K of density 1.3g/cm3
d.Cannot be determined

(Better to give the reasons to explain your choosing answers and thanks a lot for answer questions)

Answer 1

1. d
2. d
3. a

An object floats on water if its density is lower than that of water. Inversely, an object sinks in water if its density is higher than that of water.

In 1 and 2, we cannot predict whether the objects sink or float because the densities are unknown. We only know their masses or volumes.