Fire: Friend And Foe

Explanation:

The flash point of a fuel is the lowest temperature at which it can produce enough vapor to ignite in the air. This temperature marks the beginning of combustion, and if the fuel is exposed to a spark or open flame, it will catch fire.

Explanation:

(i) Fire is utilized for various purposes such as cooking food, heating homes, and generating electricity.

(ii) Fire can be a hazardous servant when it becomes uncontrollable. It can burn everything in its path, causing damage to property and loss of life. Additionally, it can lead to air pollution, as well as other environmental concerns.

Explanation:

There are three primary techniques used to control or extinguish a fire. The first method is to remove the fuel source. Without fuel, a fire cannot continue to burn. The second approach is to deprive the fire of oxygen. Since oxygen is essential for combustion, removing it will prevent the fire from spreading. Finally, the third technique is to cool the fire by reducing the temperature below its ignition point. This can be achieved by spraying water, foam, or other cooling agents on the fire. By using one or more of these methods, firefighters can control and extinguish a fire.

Explanation:

When we blow on a candle, we remove the hot air surrounding the flame, which causes the temperature to drop below the flashpoint. As a result, the candle goes out.

Explanation:

Water is not a suitable extinguishing agent for oil fires because oil is lighter than water and can float on the surface. This causes the oil to continue burning even after the water has been applied. In the case of electrical fires, water should not be used because it can conduct electricity and cause electrocution.

Explanation:

To prevent fires at home, all electrical appliances should be properly earthed and insulated. It is essential to have a bucket of sand or a fire extinguisher nearby to put out small fires. Smoke detectors should also be installed in the house. In schools, students should be trained in fire safety procedures, and fire drills should be conducted regularly. Fire extinguishers should be easily accessible and in good working condition. Additionally, all electrical wiring and equipment should be regularly inspected to ensure they are functioning correctly.

Explanation:

(i) The fire began on Monday and eighteen fire tenders struggled to douse the blaze till morning.

(ii) Over 25 shops were gutted in a major fire.

(iii) No casualties were reported but property worth several lakhs was destroyed.

Paragraph: The fire began on Monday, and eighteen fire tenders struggled to douse the blaze till morning. Over 25 shops were gutted in a major fire. No casualties were reported, but property worth several lakhs was destroyed.

Explanation:

(i) Velvet grass is a type of grass found in meadows that is soft and velvety to the touch, making it pleasant to walk on.

(ii) Drinking straws refer to the long, thin proboscis or tongue-like appendages of butterflies and other insects that they use to suck nectar from flowers.

(iii) Meadow houses are mounds or burrows created by creatures such as rabbits, snakes, ants, and other animals that live in the meadows.

(iv) An amazing mound is a small hill-like structure created by ants who collect soil particles, forming a mound that appears wondrous to the observer.

(v) Fuzzy head refers to the puffy tuft of a dandelion that floats in the air and disperses seeds.

Explanation:

The line is "If you look and listen well." The stanza is given below:

Oh! Meadows have surprises

And many things to tell;

You may discover these yourself,

If you look and listen well.

Explanation:

For self-attempt. Search for images of the birds, insects, and scenes mentioned in the poem.

Explanation:

For self-attempt and a classroom activity.