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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 7 · Period 1 of 14 · 40 min

Pins on a Metal Strip

Observe and record heat-transfer phenomena · Hands-on Science

This unit opens the chapter by grounding students in a concrete observation before any definition is given — resist naming conduction until the discussion at the end. A common error to watch for: students often predict that all pins fall simultaneously or that the middle pin falls first because 'heat spreads outward'; use the actual sequence to challenge this. Checking that every student has written a prediction before heating begins is a good readiness checkpoint.

0-8Teacher poses the opening scenario — Pema and Palden at the fireplace — and asks why the end of a metal spoon in hot soup eventually becomes warm; students share ideas briefly before the activity begins.
8-16Groups attach wax-coated pins at equal intervals on the metal strip and write individual predictions about which pin will fall first, second, and so on.
16-28Teacher heats one end of the strip safely; groups observe and record the actual sequence of pin falls in a results table.
28-40Whole-class discussion compares predictions with observations; teacher introduces the term 'conduction' and the idea that heat travels from the hotter end toward the cooler end without particles moving.
Assessment

Competency (C-1.4). Observing and explaining phenomena caused due to differences in temperature.

Learning outcome. Students can describe what they observed in each investigation using accurate observational language and record results in a structured table or annotated sketch.

In the pin-fall investigation, a metal strip is heated at one end. What is the correct order in which the pins fall?

  • A All pins fall at the same moment because heat spreads instantly through metal.
  • B The pin at the cool end falls first because heat accumulates there.
  • C The pin closest to the heated end falls first, followed by each successive pin in order toward the cool end.
  • D The pin in the middle of the strip falls first because it receives heat from both sides.

C. The pin closest to the heated end falls first, followed by each successive pin in order toward the cool end.

What each wrong option reveals

  • A Student holds the misconception that conduction is instantaneous rather than a progressive transfer from particle to particle along the strip.
  • B Student has inverted the direction of heat flow, believing heat accumulates at the cold end rather than travelling toward it.
  • D Student incorrectly applies a symmetry intuition — heat spreading from both ends — without recognising that only one end is heated.
Chapter 7 · 14 periods of 40 min

Also saved as 8 periods or 10 periods or 12 periods.

  • 2Watching Smoke and Swirling Colour
    Observe and record heat-transfer phenomena
  • 3Soil and Water Heat Race
    Observe and record heat-transfer phenomena
  • 4Conductors, Insulators, and the Air in Your Woolly Jumper
    Classify materials and phenomena by mode of heat transfer
  • 5Mapping the Convection Loop
    Classify materials and phenomena by mode of heat transfer
  • 6The Third Mode — Radiation Without a Medium
    Classify materials and phenomena by mode of heat transfer
  • 7Why Does the Sea Breeze Blow Toward the Land?
    Explain causal mechanisms linking heat transfer to natural phenomena
  • 8The Water Cycle as a Heat-Driven Engine
    Explain causal mechanisms linking heat transfer to natural phenomena
  • 9How Fast Does Water Seep? — Infiltration Investigation
    Explain causal mechanisms linking heat transfer to natural phenomena
  • 10The Bukhari and the Ice Stupa — All Three Modes at Work
    Explain causal mechanisms linking heat transfer to natural phenomena
  • 11Temperature Scales and What They Mean
    Apply heat-transfer reasoning and temperature measurement to unfamiliar contexts
  • 12Why Is Kerala Warmer Than Sikkim?
    Apply heat-transfer reasoning and temperature measurement to unfamiliar contexts
  • 13Rainwater Harvesting — Applying Infiltration to a Real Problem
    Apply heat-transfer reasoning and temperature measurement to unfamiliar contexts
  • 14The Rooftop Garden Problem: Designing a Heat-Smart Urban Space
    Synthesise heat-transfer reasoning and temperature measurement across the whole chapter
Curiosity · Class 7 · 12 chapters

Any 3 chapters free · no payment details · then introductory offer ₹499 per subject-stage, per year.