Electrical Circuits Question

A student builds the circuit shown. The student closes Switch 1 and Switch 3. Which lightbulb will glow? Select ONE correct answer.

• L1

• L2

• L3

• L4

Answer explanation

When Switch 1 and Switch 3 are closed, current flows through the circuit, lighting L1. The other lightbulbs (L2, L3, L4) do not receive current due to their respective switches being open.

Students create the circuit shown. What do the lightbulb and the bell do when the switch is left open?

• The lightbulb glows, and the bell rings.

• The lightbulb glows, and the bell does not ring.

• The lightbulb does not glow, and the bell rings.

• The lightbulb does not glow, and the bell does not ring.

Answer explanation

When the switch is open, the circuit is incomplete. This allows the lightbulb to glow due to a separate power source, but the bell does not ring as it requires a complete circuit to operate.

Tags

NGSS.4-PS3-2

Cutting the wire at which numbered position would allow two of the lightbulbs to remain lit?

• Position 1

• Position 2

• Position 3

• Position 4

Answer explanation

Cutting the wire at Position 2 allows the circuit to remain complete for two lightbulbs, ensuring they stay lit. Other positions disrupt the circuit for more bulbs, leading to fewer lit bulbs.

A group of students builds the electric circuit shown. Which switches must be closed for Bulb 1 to remain dark but Bulb 2 to produce light?

• Switch 1 only must be closed.

• Switches 1 and 3 must be closed.

• Switches 2 and 3 must be closed.

• Switches 1, 2, and 3 must be closed.

Answer explanation

For Bulb 1 to remain dark, Switch 1 must be open. Closing Switches 2 and 3 allows current to flow through Bulb 2, lighting it up. Thus, the correct choice is to close Switches 2 and 3.

Which circuit shown will produce light when the switch is closed?

• A

• B

• C

• D

Answer explanation

Circuit B will produce light when the switch is closed because it completes the circuit, allowing current to flow through the light source. The other circuits either have a break or do not connect properly.

Tags

NGSS.4-PS3-2

A group of students is building the circuit represented in the diagram. What object can be used at Position X for the buzzer to sound when Switch K is closed?

• A power source

• An insulated wire

• Another bulb

• Another switch

Answer explanation

A power source is necessary to provide the electrical energy needed for the buzzer to sound when Switch K is closed. Without a power source, the circuit cannot complete, and the buzzer will not activate.

Tags

NGSS.MS-ETS1-1

A student wants to make a change to the circuit shown below so that when Switch 1 is open and Switch 2 is closed, only one light will be on in the circuit.

• F

• G

• H

• J

Answer explanation

To ensure only one light is on when Switch 1 is open and Switch 2 is closed, the circuit must be modified to create a parallel connection for the lights. Choice J likely represents this configuration, allowing only one light to illuminate.

A student constructs the circuit shown for a science demonstration. With the switches in these positions, which lights are on?

• F. All the lights

• G. Lights 1 and 2 only

• H. Lights 3 and 4 only

• J. None of the lights.

Answer explanation

With the switches in the specified positions, the circuit allows current to flow through all lights, illuminating them. Therefore, the correct answer is F: All the lights.

Tags

NGSS.MS-PS2-3

What explains why a coin at the bottom of a pool of water seems closer to the surface than it really is?

• Light reflects from the surface of the water.

• Light reflected from the coin changes direction as it leaves the water.

• Light travels only in straight lines after being reflected.

• Light reflected from the coin is absorbed by the water.

Answer explanation

Light reflected from the coin changes direction as it exits the water due to refraction, making the coin appear closer to the surface than it actually is.

Tags

NGSS.MS-PS4-2

A student looks at the picture shown. Which statement BEST explains why the trees appear on the surface of the lake?

• The trees produce light that reflects off the water.

• Light reflects off the trees and reflects off the water.

• The trees refract light that then reflects off the water.

• Light refracts from the water and is reflected off the trees.

Answer explanation

The correct choice states that light reflects off the trees and then reflects off the water, creating the appearance of the trees on the lake's surface. This explains the visual effect observed in the picture.

Tags

NGSS.MS-PS4-2