Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Tanishka Meena 3 years, 11 months ago
- 4 answers
Yogita Ingle 3 years, 11 months ago
Wildlife sanctuary is the place where wild animals are protected in their natural habitat. Here poaching or capturing the animals is prohibited.
Biosphere reserves are the area used to conserve biodiversity like plants, animals and microorganisms. It contains many wildlife sanctuaries and national parks.
Posted by Ankit Singh 3 years, 11 months ago
- 2 answers
Gaurav Seth 3 years, 11 months ago
ANSWER
Vocal cords and Layrnx vibrate whenever we speak.
When we speak muscles in the larynx bring the vocal cords together. As the air rushes from our lungs out through the larynx, the from portion of the vocal cords vibrate, producing a sound. The upper portion of our throat then modifies this sound to produce speech.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
| Planet | Satellite |
| Any astronomical body orbiting a star can be classified as a planet | Satellites both natural and artificial, orbit relatively close to planets or any other celestial body with a relatively bigger mass. |
| The term ‘planet’ is derived from the Greek word “planan” meaning “to wander”. | The term ‘satellite’ is derived from the Latin word ‘<i>satelles’</i> meaning ‘to follow” or “to attend to” |
| Examples of planets are Earth, Jupiter, Saturn, etc. | Examples of satellites are the Moon orbiting the Earth, Titan orbiting Saturn and Europa orbiting Jupiter |
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
Artificial satellites are man-made objects that orbit the Earth and other planets in the Solar System. Soviet Sputnik 1 mission was the first artificial satellite that was launched in 1957.
Uses of artificial satellites
Some of the common uses of artificial satellites are as follows:
- They are used in communication
- They are used in weather forecasting system
- They are used in GPS (Global Positioning System)
- They are used to transport instruments and passengers to the space to perform experiments.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
Life exists only on earth because of the following reasons:
- Earth has all the basic necessities that are required for an organism to survive
- The temperature and atmosphere of the earth makes life comfortable for the organism
- Earth is at an adequate distance from the sun which gives us heat that is neither too hot nor too cold
- Earth has enough amount of water, food and air for survival of living organisms
- Earth has a protective ozone layer which protect us from the harmful rays
Posted by Ankit Singh 3 years, 11 months ago
- 3 answers
Posted by Ankit Singh 3 years, 11 months ago
- 5 answers
Hardik Garg 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
Rayon, nylon, polyester, acrylic, and spandex are examples of synthetic fibres.
Fibres that are made by human beings are called synthetic fibres. Most synthetic fibres are obtained from coal, petroleum, and natural gas. A synthetic fibre consists of multiple units (each of which is a chemical substance), which are joined together to form a single unit called a polymer (poly: many; mer: unit). The structure of a polymer can be described as resembling numerous beads on a string, with the beads representing the individual units that are joined together.
Yogita Ingle 3 years, 11 months ago
The modern textile industry is unthinkable today without synthetic fibres. Man-made fibres like silk have always been greatly valued for its gloss and fineness. Man-made fibres are smooth. They can be distinguished by looking at a cross-section. Some synthetic fibres are listed below.
- rayon
- nylon
- polyester
Posted by Navadeep Chowdary 3 years, 11 months ago
- 5 answers
Shruti ? 3 years, 11 months ago
Hardik Garg 3 years, 11 months ago
Namandeep Singh 3 years, 11 months ago
Aditya Singh 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
The cell membrane is also called the plasma membrane. It provides protection for the cell and its cellular components from the external environment. It is selectively permeable and regulates the movement of molecules in and out of the cell.
Posted by Manas Yadav 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
Gravitational force is a weak force unless large masses are involved. The masses of humans are quite small and thus the magnitude of gravitational force is also very small and negligible as compared to that shown by Earth. Thus, gravitational force exists between two people sitting close by but it is negligible and cannot be felt.
Posted by Shivani Shivani 3 years, 11 months ago
- 5 answers
Namandeep Singh 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included for the variation in the distance between the various seismographs and the epicenter of the earthquakes.
Gaurav Seth 3 years, 11 months ago
A device called Seismograph is used to record seismic waves produced during earthquakes on the surface of the earth. The purpose is to measure the motion or movement of ground during an earthquake
The power of an earthquake is expressed in terms of a magnitude on a scale called Richter scale.
Destructive earthquakes generally have a magnitude of greater than 7 or 7.5. Earthquakes of magnitude 5-7 are moderate and below 5 are small or negligible.
Posted by Shivani Shivani 3 years, 11 months ago
- 2 answers
Gaurav Seth 3 years, 11 months ago
Sometimes atoms gain or lose electrons. The atom then loses or gains a "negative" charge. These atoms are then called ions. Positive Ion - Occurs when an atom loses an electron (negative charge) it has more protons than electrons.
Manas Yadav 3 years, 11 months ago
Posted by Shivani Shivani 3 years, 11 months ago
- 2 answers
Gaurav Seth 3 years, 11 months ago
When the positive and negative charges grow large enough, a giant spark - lightning - occurs between thetwo charges within the cloud. This is like a static electricity sparks you see, but much bigger. Most lightninghappens inside a cloud, but sometimes it happens between thecloud and the ground.
Yogita Ingle 3 years, 11 months ago
When the positive and negative charges grow large enough, a giant spark - lightning - occurs between thetwo charges within the cloud. This is like a static electricity sparks you see, but much bigger. Most lightninghappens inside a cloud, but sometimes it happens between thecloud and the ground.
Posted by Shivani Shivani 3 years, 11 months ago
- 2 answers
Gaurav Seth 3 years, 11 months ago
A N S W E R
To test if a body is charged or not, another uncharged body is brought in contact and seen whether the uncharged body is charged or not.
Yogita Ingle 3 years, 11 months ago
If a charged body (for example, ebonite rod) is touched to the metal disc of the gold-leaf electroscope, the metal strips of the electroscope gets charged by conduction. They repel each other and open up. In this way, we can detect whether an object is charged or not.
Posted by .. Good 3 years, 11 months ago
- 2 answers
Yogita Ingle 3 years, 11 months ago
The process of charging a body by bringing a charged body near it without touching it is called charging by induction. In this process, the body being charged acquires the opposite kind of charge to that of the body charging it.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
The sky above Earth appears to rotate because of the rotation of the Earth. The apparent fixed stars go East to West as the Earth rotates West to East. But since the axis of rotation of Earth passes through pole star, it is that point about which the sky rotates and hence the pole star appears fixed.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 2 answers
Savreen Kaur 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Sun is nearer to earth as composed to distance of other stars from the earth, the sun appears to be bigger and brighter.
Posted by Tanishka Meena 3 years, 11 months ago
- 3 answers
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
Plastic use is increasing day by day and it is not only our country's problem it is worldwide problem because it is spoiling our environment rapidly . to overcome this situation we should put our hands together to stop usage of plastic in our daily life. As responsible citizens of our country help to protect our environment from plastic related pollution by following ways:
1 We should use jute bags and jute material instead of plastics.
2 We should not throw the plastics in the drain,river,ponds,lakes.
3 We should not burn plastics as this burning emits harmful gases and pollute the environment.
Posted by Hello Kitty 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
The reason behind the rapid rise in obesity in adults and children is the cheaply available foods and drinks high in fat, sugar, and salt. Overweight problem is prevalent in poor as well as rich countries.
Posted by Vansh Garg 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
The maximum displacement of a vibrating object from its Central position is called the amplitude of vibration. The amplitude actually tell us how far the vibrating object is displaced from its central position.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 5 answers
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
One of the major functions of cytoplasm is to enable cells to maintain their turgidity, which enables the cells to hold their shape. Other functions of cytoplasm are as follows:
- The jelly-like fluid of the cytoplasm is composed of salt and water and is present within the membrane of the cells and embeds all of the parts of the cells and organelles.
- The cytoplasm is home to many activities of the cell as it contains molecules, enzymes that are crucial in the break down of the waste.
- The cytoplasm also assists in metabolic activities.
- Cytoplasm provides shape to the cell. It fills up the cells thus enabling the organelles to remain in their position. The cells, without cytoplasm, would deflate and substances will not permeate easily from one to the other organelle.
Posted by Aastha Kumari Kumari 3 years, 11 months ago
- 2 answers
Akriti Chaurasia 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Types of Plastics
1. Thermoplastic: Plastics which can be easily bent or deform on heating are known as thermoplastic. PVC and Polythene are the examples of thermoplastics.
2. Thermosetting plastic: Plastics which do not get deformed or softened on heating when mold once, are called thermosetting plastics. Bakelite and melamine are the examples of thermosetting plastics.
Uses of plastics
- Plastic are poor conductors of heat and electricity. So they are used to make covering of electric wires and handles of tools.
- Plastics are highly resistant to chemicals and water.
- Plastics are lightweight, strong and durable and are therefore used to make parts for aircrafts, cars etc.
Posted by Diksha Laniya🐥 3 years, 11 months ago
- 3 answers
Diksha Laniya🐥 3 years, 11 months ago
Posted by Diksha Laniya🐥 3 years, 11 months ago
- 2 answers
Suhani Gupta 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
Exhaustible resources are those resources which are present in limited quantity and can be completely used up by human activities are called exhaustible resources.
Exhaustible sources are those sources of energy, which will deplete and exhaust after a few hundred years.
Examples – Coal, petroleum, etc. are the exhaustible sources of energy.
Posted by Diksha Laniya🐥 3 years, 11 months ago
- 2 answers
Aastha Kumari Kumari 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
Refining of petroleum
The crude petroleum oil is a complex mixture of solid,liquid and gaseous hydrocarbons.
So before petroleum can be used for specific purpose,it has to be refined or purified.
The process of separating crude petroleum oil into more useful fractions is called refining.
The refining of petroleum into different fractions is based on the fact that the different fractions of petroleum have different boiling point.
The refining of petroleum is carried out in an oil refinery.
The crude petroleum oil extracted from oil wells is taken to the oil refinery through pipes.In the oil refinery,crude petroleum is oil is refined into different useful fractions.
The separation of petroleum into different fractions is done by fractional distillation.The various useful fractions obtained by the refining of petroleum are:Petroleum gas,petrol,kerosene,diesel,lubricating oil,paraffin wax,Bitumen.
Posted by Diksha Laniya🐥 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
Those chemicals which are obtained from petroleum and natural gas are called petrochemicals.
For Ex:Methyl alcohol,ethyl alcohol,formaldehyde,acetone,acetic acid,ethylene,benzene,toluene,vinyl chloride etc.
They are important because they are used to manufacture large number of useful material such as detergents, synthetic fibres, plastics, synthetic rubber, drugs, dyes, perfumes, fertilisers, insecticides etc.
Hydrogen gas is obtained as a petrochemical from natural gas.It is used in the manufacture of fertilisers.
Petroleum is not only a source of fuels but also provides raw material for manufacture of large number of useful substances.Due to its great importance ,it is called black gold.
Posted by Diksha Laniya🐥 3 years, 11 months ago
- 2 answers
Gaurav Seth 3 years, 11 months ago
Fossil fuels
Exhaustible natural resources like coal, petroleum and natural gas were formed from the dead remains of living organism (fossils). So, these are called fossil fuels. Coal and petroleum are very important natural resources and play a vital role in modem society. They are found in the earth's crust.
Posted by Diksha Laniya🐥 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
It consist mainly of methane (about 85%), ethane (about 10%) propane (about 3%) and butane when natural gas is compressed at high pressure then it is called CNG (compressed natural gas). CNG is used for power generation.
It is now being used as a fuel for transport vehicles because it is less polluting. The great advantage of CNG is that it can be used directly for burning in homes and factories where it can be supplied through pipes. Such network of pjpeline exists in Vadodara (Gujarat) and some parts of Delhi.
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Tanishka Meena 3 years, 11 months ago
1Thank You