Track quiz
Show on a big screenTwelve quick questions. Use the table if you get stuck.
| Lesson | The rule |
|---|---|
| Heat and temperature | Temperature is the number on a thermometer. Heat is what moves in or out to change it. More water needs more heat for the same rise. |
| Hot to cold | Left alone, heat moves from a hotter thing to a colder thing. It stops when both temperatures are the same. |
| Conduction | In a solid, heat moves along the material. The solid stays in place. This is conduction. Metals are good conductors. Wood and plastic are insulators. |
| Convection | In a liquid or a gas, the warm part rises. The cooler part sinks to take its place. This is convection. |
| Radiation | Heat can move with nothing in between. This is radiation. It does not need air. Dark, dull surfaces take in more of it than light, shiny ones. |
| Every day | Ask what carried the heat. A solid that stays in place: conduction. A moving liquid or gas: convection. Nothing in between: radiation. |
| Water cycle | The Sun heats water into vapour. Cooled vapour makes clouds. Clouds give rain or snow, and the water flows back. |
| Seeping | Gravel lets water through fastest. Sand is slower. Clay is slowest. Wide gaps let water through faster. These rules are for packed ground. |
| Breezes | By day, cool air moves from sea to land: a sea breeze. At night it moves from land to sea: a land breeze. |
| Ice stupas | An ice stupa freezes winter water into a cone of ice. The cone melts slowly and gives water in spring. |
A cup and a big pan start at 20 °C. Both now read 40 °C. What is true?
A warm glass of milk stands on a cold stone slab. What moves between them?
Two same blocks touch: 70 °C and 30 °C. No heat escapes to the air. Where do they end?
A steel spoon and a wooden spoon stand in hot dal. Why does only the steel handle get warm?
A steel tumbler and a clay pot share one shelf all night. Why does the steel feel colder?
A tank of water is warmed only at the top. What happens?
The air is pumped out of a jar. A lamp shines on a plate inside. Does the plate still warm up?
A black tank and a white tank stand in the Sun. Which one's water gets warmer?
Which stage of the water cycle turns sea water into vapour?
The same rain falls on packed clay, sand and gravel. Which soaks in fastest?
It is night at the coast. Which way does the cool air move?
Why do Ladakh farmers make ice stupas?
Now open Chapter 7, Heat Transfer in Nature, in your NCERT book. Try its questions. You are ready.
Next: Measurement of Time and Motion. You will learn how a clock counts time, and what speed means.
Reveal every answer to finish this lesson.