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New NCERT textbook · Class 7 Science

Curiosity, period by period — fitted to your timetable.

Tell Meyy your periods and their length; it plans every chapter of Curiosity to fit, and you tick off sections as you teach.

Chapter 11 · Period 1 of 18 · 40 min

Luminous or Not? Sorting the World Around Us

Observe and Classify Sources of Light · Hands-on Science

This opening unit anchors the chapter in the diya-and-puppet scenario students will revisit throughout the arc, so use that story to frame every question. Watch for students who classify the Moon as luminous — this is the most common error at this stage, and pressing them to explain why the Moon is not visible in a completely light-sealed room is usually enough to surface the distinction. Groups of two work well here so every student commits a written justification before comparing.

0-8Teacher opens the chapter with the shadow-puppet scenario from the chapter — Reza and her grandmother using a diya and cutout puppets — and poses the question: what makes some objects visible in a dark room while others are not?
8-28Students work individually through the object list, completing their two-column sorting table and writing justifications; teacher circulates, pressing students who write only 'yes/no' to add a reason.
28-38Pairs compare tables, resolve any disagreements verbally, and share one disputed case with the class for group discussion.
38-40Teacher names the two categories — luminous and non-luminous — and briefly previews that the next unit will investigate how light from luminous objects actually travels.
Assessment

Competency (C-2.4). Demonstrating rectilinear propagation of light from different sources and verifying the laws of reflection through manipulation of light sources and objects and the use of apparatus such as plane mirrors, pinhole camera, kaleidoscope, and periscope.

Learning outcome. Students can classify a given object as luminous or non-luminous with a written justification, and can correctly place bioluminescent organisms within the luminous category by identifying that they produce light internally.

A student places the Moon, a burning candle, a firefly, and a wooden table in a list and must identify every object that produces its own light. Which group contains only objects that produce their own light?

  • A Burning candle and firefly
  • B Firefly and wooden table
  • C Moon and burning candle
  • D Moon and firefly

A. Burning candle and firefly

What each wrong option reveals

  • B Classifying a wooden table alongside a firefly indicates the student is using a property other than light production (perhaps size or biological nature) as the sorting criterion.
  • C Classifying the Moon as luminous — the most common misconception at this stage — indicating the student has not distinguished reflected light from self-produced light.
  • D Pairing the Moon with the firefly indicates the student recognises the firefly's special status but has still confused the Moon's reflected-light visibility with self-produced light.
Chapter 11 · 18 periods of 40 min

Also saved as 10 periods or 12 periods or 14 periods or 16 periods.

  • 2Bioluminescence: Light Without Fire
    Observe and Classify Sources of Light
  • 3Three Cards, One Flame: Does Light Bend?
    Investigate Rectilinear Propagation
  • 4Straight Tube, Bent Tube: Light Takes No Detours
    Investigate Rectilinear Propagation
  • 5Blocking the Beam: What Makes a Shadow?
    Explain Shadow Formation and Classify Materials by Transparency
  • 6Bigger, Smaller, Gone: How Distance Changes Shadows
    Explain Shadow Formation and Classify Materials by Transparency
  • 7Conditions for a Shadow: Building the Causal Account
    Explain Shadow Formation and Classify Materials by Transparency
  • 8Building the Pinhole Camera
    Construct and Explain the Pinhole Camera
  • 9Why Is the Image Upside Down? Tracing the Rays
    Construct and Explain the Pinhole Camera
  • 10Bouncing Light: First Encounter with Reflection
    Investigate Reflection and Verify the Laws of Reflection
  • 11Measuring the Bounce: Incident and Reflected Angles
    Investigate Reflection and Verify the Laws of Reflection
  • 12Formalising the Laws: From Data to Principle
    Investigate Reflection and Verify the Laws of Reflection
  • 13Locating the Image: Pin-and-Mirror Investigation
    Analyse Image Properties in Plane Mirrors and Multiple Reflections
  • 14Mirror Writing and Lateral Inversion
    Analyse Image Properties in Plane Mirrors and Multiple Reflections
  • 15Between Two Mirrors: Multiple Images and the Kaleidoscope
    Analyse Image Properties in Plane Mirrors and Multiple Reflections
  • 16Which Principle Is at Work? Connecting Devices to Foundations
    Demonstrate and Apply: Rectilinear Propagation and Laws of Reflection in Optical Devices
  • 17Designing a Test: Can You Verify It?
    Demonstrate and Apply: Rectilinear Propagation and Laws of Reflection in Optical Devices
  • 18The Lighthouse Keeper's Problem: Light at Work Across an Island
    Demonstrate and Apply: Rectilinear Propagation and Laws of Reflection in Optical Devices

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