Science topic 3 2023

1.Benny’s family bought a new electric stove. The stovetop had several large circles on it. When Benny’s father turned on the stove, the circles glowed with a red color. What can you infer about these circles?

 

• A. The circles gave off both heat and light.

• B. The circles gave off only light to show where to place the pans.

• C. The circles gave off light but not heat.

• D. The circles gave off light to help the cook see the stove.

Alex turned on the light in his room so he could do his homework. What type of energy transformation is taking place in Alex’s room?

• A. electrical to light

• B. light to mechanical

• C. mechanical to heat

• D. heat to electrical

Which useful energy transformation occurs in the toaster?

• A. heat to sound

• B. electrical to heat

• C. heat to electrical

• D. sound to mechanical

A student turns on a light bulb. Which energy transformation takes place in the light bulb?

• A. electrical to light

• B. light to electrical

• C. electrical to mechanical

• D. mechanical to electrical

What happens when an electric keyboard is played?

• A. Light energy is transformed into electrical energy.

• B. Electrical energy is transformed into sound energy.

• C. Motion is transformed into electrical energy.

• D. Sound energy is transformed into motion.

When you use an electric fan to cool down, the electrical energy is mainly transformed into what type of energy?

• A. heat

• B. light

• C. motion

• D. sound

Tags

NGSS.MS-PS3-5

Which of the following items would be the BEST conductor of heat?

• A.  A plastic spoon

• B.  An oven mitt

• C.  A wooden board

• D.  A metal pan

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which of these best describes why many electrical wires have plastic coatings on them?

• A. Plastic conducts electricity, so it helps the electricity flow through the wire.

• B. Plastic does not conduct electricity, so it helps the electricity flow through the wire.

• C. Plastic conducts electricity, so it keeps a person from getting shocked when handling the wire.

• D. Plastic does not conduct electricity, so it keeps a person from getting shocked when handling the wire.

A ladder made of which material would be the most dangerous to use if someone were working around power lines?

• A. fiberglass

• B. metal

• C. plastic

• D. wood

Which is true?

• A. Insulators easily conduct electricity.

• B. Conductors block the flow of electricity.

• C. Insulators allow current to flow through them.

• D. Conductors allow electrons to flow through them.