Class 5 My Science, Health and Physical Education Guide
Part 1 - Science
Lesson 15 - Simple Local Technologies
1. Put a tick (√) if the statements is correct and a cross (×) if it is wrong.
Answer 👉
a. √
b. √
c. ×
d. √
2. Fill in the blanks with the correct words.
Answer 👉
a. A wooden stick that is used for moving the upper stone wheel of stone grinding mill is called "gara".
b. In improved earthen stove, the surplus smoke goes out of the house through "chimney".
c. High "pressure" causes the juice in juicy fruits to come out.
d. "Firewood" is used as fuel to cook food in earthen stove.
Answer the following questions in short.
a. Write the operational theory of hand mill.
Answer 👉 The operational theory of hand mill is that the grain is poured into the hopper and then it falls between two discs. These discs rotate against each other to crush the grains and then the crushed grains come out of the mill from the side.
b. How do we use the sugarcane juice?
Answer 👉 Sugarcane juice can be used in many ways, such as making molasses, jaggery, and sugar. It can also be used as a sweetener in various food and drinks.
c. Why does traditional earthern stove need improvement?
Answer 👉 Traditional earthen stoves need improvement because they are inefficient in burning fuel and produce a lot of smoke, which is harmful to health. They also require a lot of wood, which contributes to deforestation.
d. How does improved earthern stove help in proper use of power?
Answer 👉 Improved earthen stoves help in proper use of power by increasing the efficiency of burning fuel, reducing smoke emission, and reducing the amount of wood required for cooking. This leads to less deforestation and less health hazards.
e. Write the structure of stone grinding mill in short .
Answer 👉 The stone grinding mill consists of two stone discs, one stationary and the other rotating. Grain is poured into the gap between the two discs and is crushed by the rotating disc. The crushed grain comes out of the side of the mill. A wooden handle is used to rotate the stone disc.
