States of Matter
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?
B. Oxygen gas
A student is testing different types of wood to use for a bookshelf. The student tests each type of wood to predict how many books the bookshelf will safely hold.
Which of the following characteristics of the wood best determines how many books the bookshelf can safely hold?
C. Strength
A student looks into the mirror and sees the wall behind him. Which of the following best describes why the student sees the wall in the mirror?
A. Light reflects off of the mirror
Which of the following shows two objects that are both conductors of electricity?
B.
The diagram below shows a clock radio with four labeled parts.Which part of the radio is designed to transform electrical energy into sound energy?
C. Speaker
A student freezes some orange juice. Which of the following statements best describes how the orange juice is different after it is frozen?
c. It stays in one shape
The diagram below shows a student’s design for a pulley system used to lift objects up to the platform.
Which of the following is most important to consider when choosing the type of rope for the pulley system?
C. The amount of weight the bucket can hold
The pictures below show four objects that a student placed outside in the sunlight.
Which object should absorb the greatest amount of light?
B. A black towel
The diagram below shows a project that a student made to test an electrical circuit. Part of the electrical circuit is underneath the board.
When the student connects the two nails using a wire, the bulb lights up. Which of the following must be underneath the board?
D. a power source and some wires
A crane operator uses a crane with an electromagnet to move scrap metal over a train car, as shown below.
Which of the following statements describes what the crane operator does to drop the scrap metal into the train car?
B. The crane operator turns off an electric current in the electromagnet.
Chris left a glass of water on a windowsill. When he looked at the glass a few days later, some of the water had evaporated. Which of the following best describes what happened to the particles of water that evaporated?
B. They spread out into the air.
The picture below shows two wooden tables at a furniture store. The tables are not painted or coated.
A shopper wants to find out if the tables are made from the same type of wood. Which of the following properties of the tables could be used to find this out?
D. Color and hardness
Which of the following diagrams best represents how light travels from a flashlight to a piece of paper that is 40 cm away?
B
Which of the following best explains why electrical wires are usually covered with plastic or rubber?
A. to keep the energy inside the electrical wire
Stacie wants to make an electromagnet using a copper wire wrapped around an iron bar, as shown below.
To make the bar an electromagnet, what should Stacie do next?
C. Attached a power source
A pond is pictured below in two different seasons. Which of the following has caused the changes in the pond from A to B?
A. The pond water has lost heat energy.
A scientist is using a special camera to take pictures of animals that visit a pond at night. The camera is very expensive and is easily damaged by water. The camera will be left at the pond for a month to take pictures.Which of the following describes the best way to protect the camera while it is taking pictures at the pond?
C. place the camera in a sealed, clear plastic container on a pole
In a science investigation, a student holds a vibrating turning fork near a piece of cork, as shown below. The student observes that the cork moves. Which of the following conclusions can be made from this investigation?
C. Sound travels in moving waves until it hits an object
A student builds a compass from a pencil, a clear plastic cup, some thread, and a magnetized needle. The student then brings the north end of a bar magnet near the north end of the needle as shown below.
What happens when the north end of the bar magnet is brought near the north end of the compass?
The north end of the needle spins away from the bar magnet
The picture below shows a battery-powered electric car. The chemical energy in the battery is changed into electrical energy when the car is being driven. The electrical energy is then changed into other forms of energy in the car. Which of the following energy changes does not occur within the car?
Electrical energy to magnetic energy in the wheels.
Which letter shows the phase change of melting?
C. C
A student is collecting water samples. The student needs a container that holds water, will not break easily, and can be used many times.
Which of the following containers will best meet the student’s needs?
D. A plastic bottle
Which sound wave shows the loudest volume?
C.
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.
Which of the following examples best describes one type of energy changing into another?
C. an electric heater warming up a cold room