PSSA Science Review

Which of these objects will rust?

• wood chips
• plastic straws
• iron nails
• glass beads

When an animal breathes faster and its heart beats faster, the animal is MOST likely

• cold 
• frightened 
• resting 
• sleeping

A renewable energy source is a source that will not run out. Which is an example of the use of such a source?

• A coal furnace heating a house
• A windmill pumping water on a farm
• A kerosene lamp lighting a room
• A diesel truck traveling along a road

Plants grow best in soils that are rich in which of the following?

• grains of sand
• lumps of clay
• layers of gravel
• decaying plants and animals

Which is the best source of vitamins and minerals?

• fruits and vegetables
• bread, rice, and pasta
• milk and milk products
• meat, fish, and poultry

In which example does an object move because of a force of gravity?

• a girl hitting a ball with a bat
• a boy pushing a box across the floor
• a girl hammering a nail into a wall
• a boy falling from a tree onto the ground

Most birds sit on eggs until they hatch. Which of these is the most important reason why birds sit on their eggs?

• to keep the eggs inside the nest
• to keep the eggs warm
• to protect the eggs from the wind
• to protect the eggs from the rain

Which statement is true for all objects?

• All objects are shiny
• All objects are hard
• All objects are rough
• All objects have mass

What do birds, bats and butterflies have in common?

• feathers
• hair
• internal skeleton
• wings

Which of these soil changes is due only to natural causes?

• Loss of minerals due to farming
• Deserts forming due to tree cutting
• Flooding due to dam construction
• Minerals washing out due to heavy rain