Electricity, Magnetism & Light — Chapter Practice, Grade 6

How do fields, circuit paths, and light models explain observable changes? Which modeled circuit keeps lamp B available when lamp A is switched off, and what does the evidence not show?

Problem 1

Does losing electrons make the object negative?
Answer and explanation

No. It leaves more positive than negative charge in the stated model, so its net charge becomes positive.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 2

Can repulsion occur without touching?
Answer and explanation

Yes. Electric interaction acts through a field; contact is not required for the modeled force.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 3

Does attraction uniquely identify the paper’s net charge?
Answer and explanation

No. A shifted distribution in neutral material can also produce attraction; additional evidence is needed.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 4

Why should handling be recorded?
Answer and explanation

It can affect charge movement and the observed interaction, so a difference cannot be assigned to material alone without comparable conditions.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 5

Develop a complete response: Find each net imbalance and explain the total charge account. Include relevant evidence and one method or model limit.
Answer and explanation

A has ten positive and eight negative units, a net positive two. B has ten positive and twelve negative, a net negative two. The combined twenty positive and twenty negative units remain; charge is transferred, not created. These are model units, not measured coulombs or a rule for every rubbed material.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 6

Apply the unit independently: A charged object attracts a neutral water stream in a supplied model. Must the stream have acquired an opposite net charge? Give a reason and a relevant qualification.
Answer and explanation

No. Polarization can shift the interaction without requiring an opposite total net charge. Explain the modeled distribution rather than infer net charge from attraction alone.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 7

Which statement correctly uses net charge in Electric Charge, Attraction & Materials?
  1. One illustrative result establishes every real condition and needs no further evidence.
  2. Rubbing creates electric charge from nothing.
  3. Attraction always proves two objects have opposite net charges.
  4. net charge: The imbalance between positive and negative charge in the chosen system.
Answer and explanation

net charge: The imbalance between positive and negative charge in the chosen system.

The imbalance between positive and negative charge in the chosen system. A has ten positive and eight negative units, a net positive two. B has ten positive and twelve negative, a net negative two. The combined twenty positive and twenty negative units remain; charge is transferred, not created. These are model units, not measured coulombs or a rule for every rubbed material.

Problem 8

Which statement correctly uses conductor in Electric Charge, Attraction & Materials?
  1. conductor: A material in which charge can move relatively readily under stated conditions.
  2. Rubbing creates electric charge from nothing.
  3. Attraction always proves two objects have opposite net charges.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

conductor: A material in which charge can move relatively readily under stated conditions.

A material in which charge can move relatively readily under stated conditions. A has ten positive and eight negative units, a net positive two. B has ten positive and twelve negative, a net negative two. The combined twenty positive and twenty negative units remain; charge is transferred, not created. These are model units, not measured coulombs or a rule for every rubbed material.

Problem 9

Why does closing the switch matter?
Answer and explanation

It connects the conducting path so current can be sustained in the stated battery–lamp model.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 10

Is charge used up at the lamp?
Answer and explanation

No. The lamp receives energy and transforms its distribution; charge continues through the circuit under the model.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 11

Does every open switch necessarily turn off both lamps?
Answer and explanation

No. Its location matters: a branch switch and a switch in the shared path affect different routes.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 12

What must be checked beyond a diagram?
Answer and explanation

Actual connections, component ratings, source condition, and the intended switch positions. Paper evidence establishes the modeled logic, not a tested household appliance.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 13

Develop a complete response: Recommend a design for independent lamp control and explain a limitation. Include relevant evidence and one method or model limit.
Answer and explanation

The parallel branch design provides the modeled independent control: opening A does not interrupt B’s complete path. The common switch can still stop both. The records do not establish equal brightness, battery lifetime, or a safe real construction; those require a rated design and further evidence.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 14

Apply the unit independently: A lamp fails although the drawn loop is complete. Give two plausible checks without using wall electricity. Give a reason and a relevant qualification.
Answer and explanation

Inspect an approved kit’s contacts and source condition under adult guidance, or evaluate those possibilities in the supplied record. A complete drawing does not establish that every actual component functions.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 15

Which statement correctly uses circuit in Simple Circuits: Paths, Switches & Energy?
  1. circuit: A connected path supporting charge flow and energy transfer under stated conditions.
  2. The lamp consumes the charge, leaving none in the return path.
  3. A picture of a closed circuit proves a real device is safe and functioning.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

circuit: A connected path supporting charge flow and energy transfer under stated conditions.

A connected path supporting charge flow and energy transfer under stated conditions. The parallel branch design provides the modeled independent control: opening A does not interrupt B’s complete path. The common switch can still stop both. The records do not establish equal brightness, battery lifetime, or a safe real construction; those require a rated design and further evidence.

Problem 16

Which statement correctly uses parallel branch in Simple Circuits: Paths, Switches & Energy?
  1. The lamp consumes the charge, leaving none in the return path.
  2. parallel branch: A separate conducting route between shared connection points in a circuit.
  3. A picture of a closed circuit proves a real device is safe and functioning.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

parallel branch: A separate conducting route between shared connection points in a circuit.

A separate conducting route between shared connection points in a circuit. The parallel branch design provides the modeled independent control: opening A does not interrupt B’s complete path. The common switch can still stop both. The records do not establish equal brightness, battery lifetime, or a safe real construction; those require a rated design and further evidence.

Problem 17

Are magnetic north and electric positive the same label?
Answer and explanation

No. They belong to different models; magnetic pole labels are not net electric charge labels.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 18

Why can a nearby magnet affect a compass?
Answer and explanation

It contributes to the local magnetic field with which the compass aligns.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 19

Does no visible movement prove the field is exactly zero?
Answer and explanation

No. The force may be too small to overcome friction or be detected by the procedure.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 20

What does that record support?
Answer and explanation

A current-associated magnetic effect in the stated setup, with its detection limits; it does not establish every current strength or construction.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 21

Develop a complete response: Describe the pattern and repeat variation without inventing a precise force law. Include relevant evidence and one method or model limit.
Answer and explanation

The recorded holding count decreases as gap increases under this method. At 2 cm the mean is 5 clips and the range 4–6. Clip count is a practical proxy, not force in newtons, and these three distances do not establish an exact mathematical law or prove the field stops beyond 3 cm.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 22

Apply the unit independently: A magnet attracts one metal washer but not another. Is the second washer necessarily nonmetal? Give a reason and a relevant qualification.
Answer and explanation

No. Metals differ in magnetic response, and the method has limits. Attraction is not a universal test for all metal identity.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 23

Which statement correctly uses magnetic field in Magnetic Forces, Fields & Distance?
  1. Every metal must be strongly attracted by a magnet.
  2. magnetic field: A representation of magnetic interaction around magnets or electric currents.
  3. Dividing a bar magnet creates an ordinary magnet with only one pole.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

magnetic field: A representation of magnetic interaction around magnets or electric currents.

A representation of magnetic interaction around magnets or electric currents. The recorded holding count decreases as gap increases under this method. At 2 cm the mean is 5 clips and the range 4–6. Clip count is a practical proxy, not force in newtons, and these three distances do not establish an exact mathematical law or prove the field stops beyond 3 cm.

Problem 24

Which statement correctly uses pole in Magnetic Forces, Fields & Distance?
  1. Dividing a bar magnet creates an ordinary magnet with only one pole.
  2. Every metal must be strongly attracted by a magnet.
  3. pole: A north or south magnetic orientation region in the simple magnet model.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

pole: A north or south magnetic orientation region in the simple magnet model.

A north or south magnetic orientation region in the simple magnet model. The recorded holding count decreases as gap increases under this method. At 2 cm the mean is 5 clips and the range 4–6. Clip count is a practical proxy, not force in newtons, and these three distances do not establish an exact mathematical law or prove the field stops beyond 3 cm.

Problem 25

Does seeing a book require the eye to emit a ray?
Answer and explanation

No. Light from the source reaches the page and some reflected light enters the eye.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 26

Why can shadow size change without card growth?
Answer and explanation

The geometry changes which diverging light paths are blocked before reaching the screen.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 27

Which angle should be compared with 30°?
Answer and explanation

The reflected angle measured from the same normal, not the angle from the mirror surface.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 28

Why can a rough card be visible without a mirror image?
Answer and explanation

Its surface scatters reflected light toward many directions rather than preserving one sharp organized image.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 29

Develop a complete response: Find the correct normal and surface angles, and explain the drawing error. Include relevant evidence and one method or model limit.
Answer and explanation

The correct reflected angle is 40° from the normal and 50° from the surface. Drawing 40° from the surface makes it 50° from the normal, so the mismatch comes from the reference line. These are ideal ray-model angles, not a record of an actual mirror trial.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 30

Apply the unit independently: A larger shadow is observed after moving a card. Must the card itself have become larger? Give a reason and a relevant qualification.
Answer and explanation

No. Source–object–screen distances and source size affect shadow geometry. Check those conditions before claiming a change in the object.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 31

Which statement correctly uses normal in Light, Shadows & Reflection?
  1. A visible object must generate its own light.
  2. Reflection angles are defined from the surface rather than the normal.
  3. normal: A line perpendicular to a surface at the point being considered.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

normal: A line perpendicular to a surface at the point being considered.

A line perpendicular to a surface at the point being considered. The correct reflected angle is 40° from the normal and 50° from the surface. Drawing 40° from the surface makes it 50° from the normal, so the mismatch comes from the reference line. These are ideal ray-model angles, not a record of an actual mirror trial.

Problem 32

Which statement correctly uses reflection in Light, Shadows & Reflection?
  1. One illustrative result establishes every real condition and needs no further evidence.
  2. Reflection angles are defined from the surface rather than the normal.
  3. A visible object must generate its own light.
  4. reflection: Light being redirected from a surface.
Answer and explanation

reflection: Light being redirected from a surface.

Light being redirected from a surface. The correct reflected angle is 40° from the normal and 50° from the surface. Drawing 40° from the surface makes it 50° from the normal, so the mismatch comes from the reference line. These are ideal ray-model angles, not a record of an actual mirror trial.

Problem 33

Does a ray at 0° from the normal have to bend sideways?
Answer and explanation

No. Its speed can change while its direction remains along the normal.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 34

What evidence would challenge a claim that the spoon broke?
Answer and explanation

An intact spoon outside the water and the modeled change in light paths support apparent displacement instead.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 35

Does a prism make colors from new matter?
Answer and explanation

No. It separates components of the incoming light through wavelength-dependent propagation.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 36

Why is source color part of the explanation?
Answer and explanation

The surface cannot reflect an absent green component in this idealized model; observed color depends on both source and material.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 37

Develop a complete response: Explain each outcome and one model limitation. Include relevant evidence and one method or model limit.
Answer and explanation

The ray bends toward the normal because 22° is less than 35° in this air-to-water model. The card appears dark because the red-only source supplies no blue for it to reflect. These diagrams omit detailed wavelength response, intensity, and actual material variation; they are not universal measurements of every card or liquid.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 38

Apply the unit independently: A learner says every transparent boundary must bend every ray. Give a counterexample. Give a reason and a relevant qualification.
Answer and explanation

A ray traveling directly along the normal can change speed without changing direction. Refraction’s speed change and oblique bending must be distinguished.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 39

Which statement correctly uses refraction in Refraction, Color & Transparent Materials?
  1. One illustrative result establishes every real condition and needs no further evidence.
  2. Every ray must bend sideways at every transparent boundary.
  3. An object appears the same color under every possible light source.
  4. refraction: A change in light propagation speed at a medium boundary, commonly with oblique bending.
Answer and explanation

refraction: A change in light propagation speed at a medium boundary, commonly with oblique bending.

A change in light propagation speed at a medium boundary, commonly with oblique bending. The ray bends toward the normal because 22° is less than 35° in this air-to-water model. The card appears dark because the red-only source supplies no blue for it to reflect. These diagrams omit detailed wavelength response, intensity, and actual material variation; they are not universal measurements of every card or liquid.

Problem 40

Which statement correctly uses spectrum in Refraction, Color & Transparent Materials?
  1. spectrum: A range of light components distinguished by wavelength.
  2. Every ray must bend sideways at every transparent boundary.
  3. An object appears the same color under every possible light source.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

spectrum: A range of light components distinguished by wavelength.

A range of light components distinguished by wavelength. The ray bends toward the normal because 22° is less than 35° in this air-to-water model. The card appears dark because the red-only source supplies no blue for it to reflect. These diagrams omit detailed wavelength response, intensity, and actual material variation; they are not universal measurements of every card or liquid.

Browse all courses