Physical Properties
Two wires carrying electricity can create a spark if they come too close together. This spark can start a fire. Wire carrying electricity are usually covered with plastic to keep them from starting a fire. Why does the plastic keep the electricity from starting a fire?
Plastic is a good insulator.
A student made a list of activities that involve energy.
1. Sharks chasing a school of fish.
2. A toaster heating bread.
3. A cell phone charging.
4. A tree limb falling to the ground.
5. Tomato plants absorbing sunlight.
6. A canoe floating down a river.
Which activities on the list are examples of the use of MECHANICAL energy?
Activities: 1, 4, and 6
Little Johnny loves going to the pool, but when he gets into the water- the size of his legs appear to change size. What is causing this illusion?
Hint: Light
The light rays that travel through water and then into air are refracted.
A student combined powdered paint with water to make a small amount of a blue liquid paint mixture. The student left the paint mixture in an open container. Several days later the student found the container and observed that changes had occurred. What most likely happened to the mixture?
A: The container was empty after the mixture evaporated into the air.
B: The paint evaporated, leaving only clear water in the container.
C: The water evaporated, leaving only a dry blue solid in the container.
D: The liquid paint mixture was lighter in color after some water evaporated.
C: The water evaporated, leaving only a dry blue solid in the container.
Erosion is one of the processes involved in the formation of sedimentary rock. Describe an example of the process of erosion.
Pieces of rock or soil are carried from one place to another.
A student put four objects in a bucket filled with water. The objects are listed below.
1. Plastic Ball
2. Glass Marble
3. Metal Paper Clip
4. Wood Block
Which two objects are most likely less dense than the water?
Plastic Ball and Wood Block
Three different objects that use the SAME type of energy are listed below.
1. Energy-Efficient House
2. Calculator
3. Satellite
What is the energy source for these objects?
Solar Energy
**If you said electrical, does a satellite have a cord that plugs into an outlet here on earth? (HINT: No, no it does not.)**
Which of these best demonstrates the REFLECTION of light?
A: Looking through the glass of a large window.
B: Looking at an image formed on a silver spoon.
C: Looking at a light-bulb that is glowing.
D: Looking at a star on a clear night.
Hint: Light
B: Looking at an image formed on a silver spoon.
Some ways to separate mixtures are listed below.
1. Boil the mixture to evaporate the water.
2. Pass a magnet over the mixture.
3. Pour the mixture through a paper filter.
4. Use tweezers.
A student is given a beaker containing gravel and water. Which of these ways could the student NOT use to separate the gravel and water?
**Are either gravel or water magnetic?**
A student hiking in a rocky area on a mountain notices that wide, deep cracks have formed in some of the large rocks. Some of the cracks are so large that the rock has broken apart. Which process most likely caused these rocks to crack and break?
A: Erosion by wind
B: Water freezing and thawing
C: Erosion by fast moving water
D: Sediments being deposited
B: Water freezing and thawing
Which of these is NOT soluble in water?
A: Oil
B: Salt
C: Honey
D: Sugar
A: Oil
Water flows through turbines in dams. The flowing water makes the turbines spin. What type of energy is used to make the turbines spin in this type of dam?
A student is asked to design a sleeve for a cup that will insulate thermal energy and not feel hot to the touch when the cup is filled with hot liquid.
The student has four materials to choose from. Which of these materials is least useful as an insulator?
A: Cardboard
B: Aluminium
C: Rubber
D: Plastic
Hint: Physical Properties
B: Aluminium
Some people add sugar to their hot tea. Which property of the sugar remains the same when the sugar is in the tea solution?
A: The taste of the sugar
B: The size of the sugar crystals
C: The color of the sugar
D: The texture of the sugar
A: The taste of the sugar
Glaciers are masses of ice that move slowly on land. What feature was most likely formed by a glacier?
A Valley
A teacher wears protective gloves to lift a metal pan filled with boiling water from a hot plate. Why are the protective gloves necessary?
Fill in the blank: The metal pan ________ thermal energy.
The metal pan CONDUCTS thermal energy.
When a bat searches for its prey at night, it makes sounds as it flies, and it uses the sounds' echoes to find its prey. When the bat flies and listens to echoes to locate prey, it is using-
(Hint: what TWO types of energy is it using?)
Sound and Mechanical Energy
Mixtures cannot be separated physically.
False, they can be physically separated.
Solutions have two parts, a _______ and a ________.
Solvent and Solution
Which landform is the result of a rapid change on earth?
A: U-Shaped Valley
B: Limestone Cave
C: Mountain Range
D: Volcanic Island
**Hint: Use the process of elimination**
D: Volcanic Island
A student classifies the following objects based on their physical properties.
1. Penny
2. Cotton Ball
3. Plastic Ruler
4. Metal Paper Clip
5. Eraser
6. Key
7. Iron Nail
8. Rubber Band
Which property cannot be used to classify these objects into more than one group?
A: Magnetism
B: Mass
C: Electrical Conductivity
D: Solubility in Water
D: Solubility in Water
**Are any of the objects listed soluble?**
A student uses a set of headphones to listen to music. Which of these objects uses the same source of energy as the headphones?
A: A Flute using wind energy
B: A piano using mechanical energy
C: A keyboard using electrical energy
D: A teapot using thermal energy
C: A keyboard using electrical energy.
(Hint: focus on the SOURCE of the energy)
Some students paint the inside of several boxes. They paint each box a different color. They observed that the inside of the box painted white looks brighter than the others. What is most likely the reason this box looks brighter?
Hint: Light
More light is REFLECTED off of the white paint.
When a powdered drink mix is added to water, the liquid turned orange. A student decided the taste was too strong, so he poured half of the liquid and added more water. Which of following most likely occurred when he added the water?
A: The physical state changed
B: The orange color became lighter
C: The liquid had a sweeter taste
D: None of the above
B: The orange color became lighter
The size and shape of a Delta can change over time. Which of the following will NOT likely change the Delta over time?
A: The number and height of the tides along the shore.
B: The amount and size of sediment carried by the river and streams.
C: The amount of hunting and fishing in the Delta.
D: The number and size of waves from the ocean that reach the shore.
C: The amount of hunting and fishing in the Delta