The density of sea water is (more / less) than that of fresh water.

Choose one example of first class lever out of the given options:

(door-knob/see-saw)

Choose the right example for a second class lever:

(scissors / bottle opener)

Choose the correct example of the third-class lever.

(Fishing rod/Wheelbarrow)

Choose the right example for an object that floats on water:

(Wood/Salt)

Choose the right example for an object that sinks in water:

(Rock/Leaf)

Choose the right example for a substance that dissolves in water:

(Soil/Salt)

Choose the right example for a substance that does not dissolve in water:

(Sand/Sugar)