A teacher places four small cubes on a table in front of a science class. Each cube is the same size and is painted the same color. However, each is made of a different material. What tool could a student use to find the cube made of iron?
A magnet.
Look at the picture of the island. Which process most likely caused the island to change over time?
A. earthquakes over many days B. hurricanes over several months C. rain and flooding over several years D. weathering and erosion over millions of years
D. weathering and erosion over millions of years. The island was changed by the slow processes of weathering and erosion. A and B both describe fast processes. While C does take several years, D is the best answer
At the beginning of a science class, the teacher opened a small sealed jar and placed it on a table. The contents of the jar spread throughout the room during class.
Which of the following did the jar most likely contain?
A. cloth fibers B. oxygen gas
C. saltwater D. snowflakes
B. oxygen gas - Gases have no definite volume and fill up the space that they are given.
Solids have a definite volume and shape
Liquids have a definite volume and they take the shape of their container, filling it from bottom.
When a student blows across a bottle, a sound is made. What causes that sound? A. Air vibrating inside the bottle B. Warm air heating the inside of the bottle C. Cool air moving away from the bottle D. Warm air mixing with cold air inside the bottle.
A. Air vibrating inside the bottle Sound is caused by vibrations in a medium (air, water, etc.)
A student took pictures of the Moon on different days. Which set of pictures did the student take on Sunday, Wednesday, and Saturday of the same week?
A student glued two pieces of wood together. The student needs to hold the two pieces of wood together tightly until the glue is fully dry the next day. Which of the following tools is best for holding the two pieces of wood together until the glue is dry?
C. clamp
Three bar magnets are placed inside a plastic tube. Which of the following pictures best shows how the three bar magnets will move after being placed inside the tube?
C. Magnets with the same poles repel. Magnets with opposite poles attract.
A small laundry room has several shelves above the washing machine. These shelves are an example of
A. making the wall stronger.
B. using storage space efficiently.
C. using a machine for more than one purpose.
D. solving the need for shelter in a creative way.
B. using storage space efficiently
Which of the following diagrams best represents how light travels from a flashlight to a piece of paper that is 40 cm away?
B. The light does not curve or bend. It travels in a straight line.
Which of the following properties best describes a material’s ability to resist scratching?
A. weight B. flexibility
C. length D. hardness
D. hardness