Solids & Liquids — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which object will float on water?
A) a leaf
B) a metal spoon
C) a big rock
D) a coin
A leaf is very light, so it stays on top of the water and floats.
2. Which object will most likely sink?
A) a plastic cup
B) a feather
C) a heavy rock
D) a piece of wood
A heavy rock is dense, so it pushes through water and sinks to the bottom.
3. Why does a small pebble sink in water?
A) it is very heavy for its size
B) it is shiny
C) it is round
D) it is clean
A pebble is dense, which means a lot of material is packed into a small space, so it sinks.
4. Which of these would float in a bathtub?
A) a rubber duck
B) a metal key
C) a bag of sand
D) a brick
A rubber duck is light and has air inside, so it stays on top of the water.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A leaf will float on the water.
Light objects rest on top of the water instead of sinking down.
2. A big heavy rock will sink in water.
Heavy, dense objects push through water and go down to the bottom.
3. Boats are made to float on top of the water.
Boats are shaped and filled with air to stay on the top of the water.
4. A coin is small but it will sink.
Even small metal objects are dense, so they sink instead of floating.
5. A piece of wood will usually float in water.
Wood is light for its size, so it rests on top of the water.