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Ask QuestionPosted by Bhakti Kurkure 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
Hot air is lighter than cold air. The reason fr this is when air gets heated up it expands and becomes less dense than the air surrounding it also the distance between the molecules increases. So the less dense air floats in the much denser air just like ice floats on water as ice is less dense than water. A similar example of wood floating on water can also be taken in to account. Wood is solid and less dense hence, it floats on water.
Posted by Bhakti Kurkure 5 years, 2 months ago
- 3 answers
Kaushal Kashyap 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Turmeric is also used as natural indicator. Turmeric is of yellow colour. Turmeric paper turns into red when it is dipped into basic solution. Turmeric paper does not change its colour with acid.
Posted by Heer Jaitly 5 years, 2 months ago
- 5 answers
Kaushal Kashyap 5 years, 2 months ago
Posted by Heer Jaitly 5 years, 2 months ago
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Komal Poonia 5 years, 2 months ago
Posted by Heer Jaitly 5 years, 2 months ago
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Posted by Awantika Kumari 5 years, 2 months ago
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Asif Naiyer 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Liver (the largest gland in human body) secretes bile juice that is stored in a sac called the gall bladder. The bile helps in the digestion of fats.
Posted by Kavya Sehrawat 5 years, 2 months ago
- 1 answers
Kaushal Kashyap 5 years, 2 months ago
Posted by Kavya Sehrawat 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Cold water exerts more pressure than warm air as cold air is denser than warm air while warm air is lighter and less denser than warm air so less pressure is exerted.
Posted by Kavya Sehrawat 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
Hot air is lighter than atmospheric air.
The air inside the hot air balloon is less dense.
It causes the hot air balloon to rise as it is lighter than surrounding air.
Posted by Kavya Sehrawat 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
When air rushes over the curved upper wing surface, it has to travel further than the air that passes underneath, so it has to go faster (to cover more distance in the same time). According to a principle of aerodynamics called Bernoulli's law, fast-moving air is at lower pressure than slow-moving air, so the pressure above the wing is lower than the pressure below, and this creates the lift that powers the plane upward.
Posted by Kirat Kaur 5 years, 2 months ago
- 2 answers
Watch Out 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Lactic Acid is an organic acid with chemical formula C3H6O3. It is also known as milk acid. When milk sugar (lactose) undergoes fermentation, the product obtained is lactic acid. It is found in cottage cheese, leban, sour milk, yogurt, and Koumiss.
Posted by Utkarsh Rijhwani 5 years, 2 months ago
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Charm Motivation 5 years, 2 months ago
Posted by Ribu'S World 5 years, 2 months ago
- 4 answers
Gaurav Seth 5 years, 2 months ago
- No medium is required for transfer of heat by radiation.
From the sun the heat comes to us by another process known as radiation. The transfer of heat by radiation does not require any medium. It can take place whether a medium is present or not. When we sit i n front of a room heater, we get heat by this process. A hot utensil kept away from the flame cools down as it transfers heat to the surroundings by radiation. Our body too, gives heat to the surroundings and receives heat from it by radiation.
Posted by Sarabjot Singh 5 years, 2 months ago
- 3 answers
Suganya Vis 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
Aluminum hydroxide (Al[OH] 3 ): antacids, deodorants.
Ammonium hydroxide (NH 4 OH): glass cleaner.
Calcium hydroxide (Ca[OH] 2 ): caustic lime, mortar, plaster.
Magnesium hydroxide (Mg[OH] 2 ): laxatives, antacids.
Sodium bicarbonate/sodium hydrogen carbonate (NaHCO 3 ): baking soda.
Posted by Ibrahim Saiyed 5 years, 2 months ago
- 5 answers
Charm Motivation 5 years, 2 months ago
B. Janani Sri 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Litmus is the most commonly used natural indicator available as strips of paper or solution. It is extracted from lichens. It turns to red on addition of an acidic solution and turns blue on addition of a basic solution.
Posted by Kirat Kaur 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
Diaphragm - It is a dom shaped ,muscles which separates the thoracic cavity, containing the heart and lungs, from the abdominal cavity and performs an important function in respiration.
Posted by Kirat Kaur 5 years, 2 months ago
- 2 answers
Suryansh Vashishtha 5 years, 1 month ago
Yogita Ingle 5 years, 2 months ago
Cellular respiration is a characteristic of all living cells in organisms. It is a catabolic process in which reduced substrates are oxidised to release energy and synthesize biochemical intermediates. In aerobic respiration, oxygen is utilised by the organisms to indirectly break down nutrient molecules like glucose and to derive energy for performing various activities. Carbon dioxide which is harmful is also released during the catabolic reactions.
Posted by Annapurna Rvkasi 5 years, 2 months ago
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Watch Out 5 years, 2 months ago
Annapurna Rvkasi 5 years, 2 months ago
Posted by Nihal Gandhi 5 years, 2 months ago
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Nihal Gandhi 5 years, 2 months ago
Posted by Areeba Sajid 5 years, 2 months ago
- 2 answers
Gaurav Seth 5 years, 2 months ago
the function of the heart.
Answer:
The heart is an organ which beats continuously to act as a pump for the transport of blood, which carries other substances with it. The human heart is divided into four chambers. The upper two chambers are called right and left atrium and the lower two chambers are called the right and left ventricles. Right atrium receives carbon dioxide-rich blood from the body. Blood from right atrium enters the right ventricle, which contracts and pumps the blood to the lungs. On the other hand, oxygen-rich blood from the lungs returns to the left atrium. From the left atrium, blood enters left ventricle. Left ventricle contracts and pumps the blood to all parts of the body. Hence, the rhythmic contraction and expansion of various chambers of the heart maintains the transport of oxygen to all parts of the body.
Posted by Kamini Rai 5 years, 2 months ago
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Abhijeet Kumar 5 years, 2 months ago
Posted by Akash Hazarika 5 years, 2 months ago
- 2 answers
Meghna Thapar 5 years, 2 months ago
- The air molecules expands on heating and contracts on cooling. The hot air molecules occupy more space than cold air molecules.
- The hot air molecules are more heavier than the cold air molecules.
- The warm air rises up and the cold air remains settled at the bottom.
- The warm air rises and it develops low pressure in the area, and the surrounding cooler air is relatively at the higher pressure.
- For example, two test tubes are taken and the open end is covered with the balloon. The test tubes are immersed in the hot and cold water respectively.
- The air inside the hot air balloon will expand and the balloon will swell and the balloon get sucked inside the balloon when exposed to the cold air.
Posted by Akash Hazarika 5 years, 2 months ago
- 1 answers
Meghna Thapar 5 years, 2 months ago
A laboratory thermometer cannot be used to measure the human body temperature. This is because as soon as we take out the bulb of the laboratory thermometer from our mouth, the level of mercury in its tube will start falling quickly. This will give a wrong value of the body temperature. Laboratory thermometers are also designed for lab purposes such as checking boiling point, freezing point, or temperature of other substances.
Posted by Ruchika Mathur 5 years, 2 months ago
- 1 answers
Gaurav Seth 5 years, 2 months ago
Ans : Sericulture
Rearing of Silkworm: In the beginning, the female silk moth lays hundreds of eggs. These eggs are stored over a clean paper or piece of cloth. These eggs are then sold to the silkworm farmers. The farmers then keep the eggs under the accurate temperature and humidity at a clean place. They are warmed to the most appropriate temperature to hatch eggs to produce larvae or caterpillar. This process is done when the mulberry trees have fresh crop of leaves. The caterpillar eats this mulberry leaves day and night and it grows in size.
Posted by Deekshitha S.E 5 years, 2 months ago
- 4 answers
Gaurav Seth 5 years, 2 months ago
Most people believe that the desert is an endless stretch of land. They think that it is dry, hot, waterless and without shelter. The specialist, however, see the desert as a beautiful place. For them a desert is the home of a variety of people, animals and plants. True, that it does not always have a cover of grass. The rain is rare. But when it does, the desert becomes as beautiful as any tropical garden. A may sometimes have mountains and hills. It may have an oasis also. A desert can be hot like the Thar or cold like Ladakh. In general, when a place has little or no water and vegetation, people call it a desert. Sand dunes are found in those deserts which are almost totally without water. These dunes keep on shifting across the desert. All creatures need water. The animals and plants of the desert are able to survive on less water. A camel can do without water for days together. The reason is that a camel can drink a lot of water at one time. Now camels do not sweat, so they retain the water they drink for a long time. Smaller desert animals get their water from the moisture in the things they eat. So some of them get the water they need from the animals they eat. Those who don't eat meat, eat plants and seeds. Thus they get get the needed water from plant juices. In our cities and villages, the climate is humid. The moisture in the air acts like a blanket. It protects the earth from the hot rays of the sun. So the earth is not very during the day. The same cover doesn't let the heat go out during the night. So the earth is not very cold during the night. Thus the variation in temperature during the 24 hours is not much. Since there is no such cover in the desert, there is much variation between the day and night temperature there. The temperature rises much during the day. In the same way, it falls much during the night.
Smrutirekha Raul 5 years, 2 months ago
Posted by Smrutirekha Raul 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
ATP stands for Adenosine triphosphate, an organic molecule responsible for driving nearly all cellular mechanisms and processes in living organisms. Hence, biologists often refer to ATP as the “energy currency of the cell
Posted by Abhishek Kumar 5 years, 2 months ago
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Posted by Aman Kumar 5 years, 2 months ago
- 3 answers
Yogita Ingle 5 years, 2 months ago
- In solids, particles are tightly or closely packed.
- The gaps between the particles are tiny and hence it is tough to compress them.
- Solid has a fixed shape and volume.
- Due to its rigid nature, particles in solid can only vibrate about their mean position and cannot move.
Posted by S Balamani Kanta Reddy 8A 5 years, 2 months ago
- 1 answers
Manas Bisay 5 years, 2 months ago
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