Answer:
Here are the answers to the questions in the image you provided:
### A. Questions
3. **Which liquid is used in the thermometer?**
- Mercury (or alcohol for some thermometers).
4. **Which type of matter shows minimum expansion on heating?**
- Solids.
5. **Name the basic unit of measuring temperature.**
- Celsius (°C) or Kelvin (K).
6. **The process by which heat flows in an iron rod.**
- Conduction.
### B. Fill ups
1. **In solids, heat is transferred by** conduction.
2. **In liquids and gases, heat is transferred by the process of** convection.
3. **No medium is required for the transfer of heat by the process of** radiation.
4. **The hotness of an object is determined by its** temperature.
5. **Temperature is measured in degree** Celsius.
6. **Water boils at** 100 **°C and** 212 **°F.**
### C. Life skills
1. **One end of the objects such as a steel spoon, a plastic scale, a pencil, and a divider is put in a beaker of water. In which of these objects the other end will get hot? Why?**
- The steel spoon and the divider will get hot because metals are good conductors of heat.
2. **In which direction does the heat flow when you hold an ice cube in your hand?**
- The heat flows from your hand to the ice cube.
### D. Look at the following pictures and write the primary mode of transfer of heat in each case.
1. **From the sun to earth**: Radiation.
2. **From the flame to the vessel**: Conduction.
3. **Movement of air**: Convection.
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