Some fibres are called as synthetic fibers because these are manmade fibers prepared by using chemicals. These are made of small units that join together to form long chains. Some of the examples of synthetic fibres are nylon, rayon, acrylic, polyester etc.

Techniques to prolong the shelf life of a food are called food preservation. We know that microbes proliferate very fast in presence of food, moisture, oxygen and ambient temperature. All the methods of food preservation are aimed at ruling out the food, moisture, oxygen and ambient temperature for microbes so that they won’t proliferate. Some common methods of food preservation are as follows:

Sun Drying: This is a traditional method of food preservation. Sun-drying helps in removing moisture from food. Grains are dried in sun before being stored. Many vegetables are also sun-dried so that they can be used in off season.

Chemical Method: Some chemicals prevent the growth of microorganisms in food. These chemicals are used in pickles and jams to preserve them. Salt, acids and oil are also used as food preservatives. Examples: sodium benzoate and sodium metabisulphate.

Preservation by common salt: When a food item is kept in plenty of salt, water from food comes out because of osmosis. It results in dehydration of the food item. Absence of moisture helps to prevent the growth of microbes. Fish, meat and pickles are preserved by adding salt.

Preservation by Sugar: Sugar preserves food by reducing moisture in food. Jam, jelly and squash are preserved by adding sugar.

Preservation by Oil and Vinegar: The layer of oil on top of food prevents oxygen from entering the food. Some microbes do not survive in absence of oxygen. Some microbes cannot survive in acidic environment and thus vinegar is an effective food preservative.

The poet is thus calling such people as mindless as the cricket.] Hard work versus laziness- Through the story of the lazy cricket and the hardworking ant, the poet teaches us the virtue of hard work. The cricket was foolish enough not to see the future. The ant, on the other hand, was wise and hardworking

The separation of the State and religion in democratic societies is important because of the following reasons:

1. It helps a country to function democratically.
2. The tyranny of the majority and the violation of Fundamental Rights can be very harmful to the people belonging to the minority. So, it protects people from any type of religious violence.
3. It protects the freedom of individuals to exit from their religion, embrace another religion. It gave people the freedom to interpret religious teachings differently.

The separation of the State and religion in democratic societies is important because of the following reasons:

1. It helps a country to function democratically.
2. The tyranny of the majority and the violation of Fundamental Rights can be very harmful to the people belonging to the minority. So, it protects people from any type of religious violence.
3. It protects the freedom of individuals to exit from their religion, embrace another religion. It gave people the freedom to interpret religious teachings differently.

He calls Macavity a ‘fiend’ and a ‘monster’ because he might have wanted to portray an evil side. He might have used a cat in order to create a negative character who is a criminal and escapes easily from police. The quick movements of a cat and its mysterious eyes might have influenced him to create this evil character in the form of a cat.

3(5x-2)-2(9x-2)=29

15x - 6 - 18x + 4 = 29
-3x - 2 = 29
-3x = 29+ 2

-3x = 31

x = -31/3

 Barometer is used to measure atmosphere pressure. Manometer is used to measure gauge pressure.

अहमदनगर किले के साथ कौन-सी घटना जुड़ी है?

अहमदनगर किले के साथ साहसी चाँद बीवी की घटना जुड़ी है जिसने अकबर की शाही सेना के विरुद्ध हाथ में तलवार उठाकर अपनी सेना का नेतृत्व किया, लेकिन बाद में उसके अपने ही एक आदमी ने उसकी हत्या कर दी।

Classification of natural resources on the basis of development and use:

1. Actual Resource: Resources whose quantity is known and which are being used at present are called actual resources, e.g. coal and petroleum.
2. Potential Resource: Resources whose entire quantity may not be known and which are not being used at present are called potential resources. Potential resources can be used in future once technology for that is properly developed. For example; uranium reserves in Ladakh.

Petroleum is referred to as Black Gold. It is mainly used in the manufacture of various products such as pharmaceuticals, plastics, gasoline, synthetic fabrics, etc so it is called black gold. Petroleum is a naturally occurring element that is in a liquid state. It is either yellow or black in colour. Petroleum is usually found in geological formations underneath the earth’s crust. When the petroleum is drilled from the ground in the liquid form, it is referred to as crude oil. This name black gold itself is an indication that it is very vital to humans. Because of its oil and worth, people refer to it gold. Nowadays petroleum is very hard to find.

Causes of soil erosion:

Due to human activities like deforestation, overgrazing, construction and mining, etc.
Natural forces like wind, glacier and water leads to soil erosion.
The running water cuts through clayey soils and makes deep channels as ‘gullies’. The land becomes unfit for cultivation, this process is called gully erosion and the land is called bad land or ravines in the Chambal basin.
Sometimes, water flows as a sheet over large areas down a slope. It leads to the washing away of the top soil. This process is called sheet erosion.
Wind blows loose soil off flat or sloping land, and is called wind erosion.
Soil erosion is also caused due to defective methods of farming.

Land is a very important resource to the man kind but day-by-day our land is getting degraded. Some of the measures that can be used or practiced to conserve our land resource are:
(a) Adopting to the scientific techniques.
(b) Land Reclamation.
(c) Regulated use of chemical fertilizers, insecticides and pesticides.
(d) Afforestation.
(e) Check on Overgrazing.
(f) Control of Mining Activities.
(g) Proper irrigation facilities.
(h) Constructing retention walls in the mountain areas to stop landslides.