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- Q1
A student prepares noodles for lunch. She fills a pot with water and lets it come to a boil on the stove. After it starts boiling, she observes that bubbles move in a circular motion from the bottom to the top of the pot. She adds the noodles to the boiling water. After a few minutes, she uses a metal spoon to stir the noodles. The metal spoon feels hot in her hand as she stirs.
Which heat transfer process causes the motion of the boiling water?
evaporation
conduction
radiation
convection
30s - Q2
A student prepares noodles for lunch. She fills a pot with water and lets it come to a boil on the stove. After it starts boiling, she observes that bubbles move in a circular motion from the bottom to the top of the pot. She adds the noodles to the boiling water. After a few minutes, she uses a metal spoon to stir the noodles. The metal spoon feels hot in her hand as she stirs.
Which heat transfer process causes the metal spoon to get hot?
conduction
radiation
condensation
convection
30s - Q3
Heat is transferred from the stove to the bottom of the pot through
conduction
radiation
evaporation
convection
30s - Q4
The image shows a thermometer measuring temperature at 35°C and -20°C.
Which BEST describes why the liquid in the thermometer falls when the temperature decreases?
the liquid inside the thermometer evaporates
the liquid inside the thermometer contracts
the liquid inside the thermometer solidifies
the liquid inside the thermometer expands
30s - Q5
Railroad tracks have narrow gaps between them at regular intervals, as shown in the diagram.
What is the most likely purpose of the narrow gaps?
The gaps reduce dirt buildup on the tracks.
The gaps prevent the tracks from breaking during temperature changes.
The gaps prevent trains from coming off the tracks.
The gaps reduce the noise pollution caused when trains move over the tracks.
30s - Q6
A student conducts an experiment using a metal ball and ring attached to a stand. The metal ball moves through the ring at room temperature. The student then heats the ball on a burner and tries to pass it through the ring again, as shown in the image of the experiment setup.
The ring contracts and becomes smaller in size.
The ring expands and becomes larger in size.
The ball expands and becomes larger in size
The ball contracts and becomes smaller in size.
30s - Q7
A solar box cooker can be made by using a sealed, glass-covered box lined with aluminum foil. Food is put into a thin-walled black pot. Placed in the sun, the box becomes an oven that can be used to bake or cook a meal. How does the cooker work?
Radiant energy from the sun is absorbed by the glass, travels through the aluminum foil, and is reflected by the black pot
Radiant energy from the sun is absorbed by the glass, the black pot, and the aluminum foil.
Radiant energy from the sun travels through the glass, is absorbed by the black pot, and reflected by the aluminum foil.
Radiant energy from the sun travels through the glass, is reflected by the black pot, and absorbed by the aluminum foil.
30s - Q8
One ounce of water at 75°F is poured into each of four different containers (foil, glass, paper, foam) of the same thickness. The temperature in each container is measured every two minutes. After 10 minutes, which container of water will have the least change in temperature?
foam
glass
foil
paper
30s - Q9
Denver puts hot coffee in the thermos shown below. Why is the coffee still warm when he drinks it several hours later?
because the thermos is made of conducting material that does not transfer heat well
because the thermos is made of insulating material that does not transfer heat well
because the thermos is made of conducting material that transfers heat well
because the thermos is made of insulating material that transfers heat well
30s - Q10
Materials that allow an electric current to pass through easily are called conductors. Examples of conductors are copper, steel, iron, and other metals. Insulators are materials that do not allow an electric current to pass through them. Glass, wood, and rubber are some examples of insulators.
Circuits allow electric currents to pass through them. The image shows two circuits that a student has built. When an electric current passes through the circuit, it lights the light bulb. When an electric current cannot pass through the circuit, the light bulb is not lit.
Which statement best describes the items that the student used in the circuits?
The metal nail is an insulator, and the plastic spoon is a conductor.
The metal nail is a conductor, and the plastic spoon is an insulator.
The metal nail and plastic spoon are both conductors.
The metal nail and plastic spoon are both insulators.
30s - Q11
The student wants to make the light bulb in Circuit 2 light up.
Which change will make the light bulb light up?
replace the plastic spoon with a conductor
switch the positions of the spoon and battery
use two batteries instead of one battery
increase the length of the wire used
30s - Q12
The student replaces the metal nail in Circuit 1 with an unknown material. What evidence would prove that the material is an insulator?
The light bulb lights up in a different color.
The light bulb will not light up.
The light bulb becomes dimly lit.
he light bulb lights up brighter.
30s
