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Ask QuestionPosted by Ritu Singla 5 years, 8 months ago
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Posted by Shailja Chauhan 5 years, 8 months ago
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Arjun Kashyap 5 years, 8 months ago
Shweta Pandey 5 years, 8 months ago
Posted by Shailja Chauhan 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The alimentary canal is a long hollow tube which runs from the mouth to the **** . It includes several organs and glands that processes food.
The major organs or structures that coordinate digestion within the human body include the mouth, esophagus, stomach, small and large intestine. Glands include liver and pancreas.
Mouth- The mouth is a specialized organ for receiving food and breaking up large organic masses. In the mouth, food is changed mechanically by biting and chewing. Food is moistened by saliva. The saliva contains an enzyme called amylase, which digests starch into maltose. During chewing, the tongue moves food about and manipulates it into a mass called a bolus. The bolus is pushed back into the pharynx and is forced through the opening to the esophagus.
Small intestine: The chyme enters from stomach to the small intestine. The three parts of small intestine are duodenum, jejunum and ileum. The inner surface of the small intestine contains numerous fingerlike projections called villi. Each villus has projections of cells called microvilli to increase the surface area.</div> <div>Most chemical digestion takes place in the duodenum. In this region, enzymes digest nutrients into simpler forms that can be absorbed. Intestinal enzymes are supplemented by enzymes from the pancreas. In addition, bile enters the small intestine from the gall bladder to assist in fat digestion.
The enzymes functioning in carbohydrate digestion include amylase (for starch), maltase (for maltose), sucrase (for sucrose) and lactase (for lactose).
For fats, the principal enzyme is lipase. Before this enzyme can act, the large globules of fat must be broken into smaller droplets by bile.
Protein digestion is accomplished by several enzymes, including two pancreatic enzymes: trypsin and chymotrypsin. Peptides are broken into smaller peptides, and peptidases reduce the enzymes to amino acids.
Nucleases digest nucleic acids into nucleotides in the small intestine also.
The products of digestion enter cells of the villi, move across the cells, and enter blood vessels called capillaries. Diffusion accounts for the movement of many nutrients, but active transport is responsible for the movement of glucose and amino acids. The products of fat digestion pass as small droplets of fat into lacteals, which are branches of the lymphatic system.
Substances that have not been digested or absorbed then pass into the large intestine.
Large intestine - The large intestine's chief functions are to absorb water and to store, process, and eliminate the residue following digestion and absorption. The intestinal matter remaining after water has been reclaimed is known as feces. The feces are stored in the rectum and passed out through the **** to complete the digestion process.</div>
Posted by Nisha Jha 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Non metallic oxide react with water and give acids.
CO2 +H2O →H2CO3
when metallic oxide react with water it gives base.
MgO +H2O → Mg(OH)2
so,non metallic oxides are acidic and metallic oxides are basic in nature.
Posted by Poonam Dhiman 4 years, 7 months ago
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Posted by Kanishak Ranawade 5 years, 8 months ago
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Posted by Rahul Yadav 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Hydrogen shows some similarity with both alkali metals and halogens, it differs from them on some grounds. Unlike alkali metals, hydrogen does not possess metallic characteristics. On the other hand, it possesses a high ionization enthalpy. Also, it is less reactive than halogens.
Owing to these reasons, hydrogen cannot be placed with alkali metals (group I) or with halogens (group VII). In addition, it was also established that H+ ions cannot exist freely as they are extremely small. H+ ions are always associated with other atoms or molecules. Hence, hydrogen is best placed separately in the periodic table.
Posted by Abhinava Varma 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Refractive index of a medium depends upon the following factors:
-Wavelength of the light
-Optical density
-temperature
-The refractive index of the surroundings when the light ray passing from the surrounding enters into a medium.
Posted by Vetri Jai 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
These include many statues and building as the rods of framework are made up of iron which get rusted and gets broke.
Examples of cars and vehicles which become faulty because of the rusting of such materials.many electronical gadgets starts getting rusting because of such rusts.when those metals are exposed to moisture and oxygen
Posted by Abhinava Varma 5 years, 8 months ago
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Arjun Kashyap 5 years, 8 months ago
Posted by Manish Saini 5 years, 8 months ago
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Meghna Thapar 5 years, 6 months ago
Steps Involved in Balancing a Chemical Equation:
Consider the chemical reaction between magnesium and oxygen to understand the steps involved in balancing a chemical equation.
Step 1:
Let us first write the word equation for this reaction.
Magnesium + Oxygen → Magnesium oxide
Step 2:
Write the chemical equation for the reaction between magnesium and oxygen.
Mg + O2 → MgO
Step 3:
Count the number of atoms of an element occurring on both L.H.S. and R.H.S. in this equation.
Mg + O2 → MgO
|
Component |
Reactant |
Product |
|
Magnesium |
1 |
1 |
|
Oxygen |
2 |
1 |
This is an unbalanced equation.
Step 4:
To balance a chemical equation, first draw boxes around each formula. Do not change anything inside the boxes while balancing the equation.
Choose a reactant or a product which has the maximum number of atoms in it.
In that compound, select the element which has the maximum number of atoms. In this equation we shall select MgO i.e. magnesium oxide and the element oxygen in it.
To balance the oxygen atoms, let us multiply magnesium oxide molecule by 2 on the right hand side.
|
Component |
Reactant |
Product |
|
Magnesium |
1 |
1 x 2 = 2 |
|
Oxygen |
2 |
1 x 2 = 2 |
Step 5:
There are two oxygen atoms on either side of the equation but one magnesium atom on the reactant's side and two on the product's side. Therefore, multiply the magnesium atom by 2 on the left hand side.
|
Component |
Reactant |
Product |
|
Magnesium |
1 x 2 = 2 |
2 |
|
Oxygen |
2 |
2 |
Therefore, the number of atoms of each element of reactants = The number of atoms of each element of products.
Step 6: Writing Specific Conditions on the Arrow
The reaction is carried out in the presence of ‘Heat’. On heating, magnesium combines with oxygen present in air to form magnesium oxide.
Step 7: Writing Symbols of Physical States
Using these steps, you can balance any chemical equation.
Posted by Prince ? {The Love Guru}? 5 years, 8 months ago
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Prince ? {The Love Guru}? 5 years, 8 months ago
Prince ? {The Love Guru}? 5 years, 8 months ago
Arjun Kashyap 5 years, 8 months ago
Prince ? {The Love Guru}? 5 years, 8 months ago
Posted by Sandeep Gore 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
I = 3.4 Amp
V = 220 Volts
Electric iron has a resistance = R
V = I R
=> R = V / I = 220 / 3.4
= 64.7 Ω
When the electric iron is connected to a 110 Volts supply,
I = V / R = 110 / 64.7 = 1.7 Amp.
Posted by Raman Mathur 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
exhalation. The process of taking in oxygen-rich air is known as inhalation, while the process of releasing carbon dioxide-rich air into the atmosphere is known as exhalation.
During inhalation, the diaphragm moves down and the ribs move upwards and outwards, thereby increasing the space in the chest cavity. This leads to the movement of air inside the lungs.
During exhalation, the diaphragm moves to its former position and the ribs move downwards and inwards, thereby reducing the size of the chest cavity. This leads to the movement of air out of the lungs.
Posted by Pooja Kumari ?????? 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Joule’s law of heating states that when a current ‘i ' passes through a conductor of resistance ‘r’ for time ‘t’ then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time.
H = i 2 rt
The reason behind the heat produced is the collision of the free electrons with the lattice ions or atoms while accelerating in presence of the external electric field.
we know that
volt= work done/ total charge or v = w/q
from this we get w= vq
we know that current i = q / t
so q = it
putting this in prev equation
we get w = vit
from ohms law v = ir
putting it in prev eq we get
w = irit = i2rt joule as work is stored as heat soH = I2RT Joules
Posted by Pooja Kumari ?????? 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The heat which is produced due to the flow of current within an electric wire, is expressed in unit of Joules. Now the mathematical representation and explanation of Joule’s law is given in the following manner.
The amount of heat produced in a current conducting wire, is proportional to the square of the amount of current that is flowing through the wire, when the electrical resistance of the wire and the time of current flowing are constant.
The amount of heat produced is proportional to the electrical resistanceof the wire when the current in the wire and the time of current flowing are constant.
The heat generated due to the flow of current is proportional to the time of current flowing, when the electrical resistance and the amount of current is constant.
Posted by Pooja Kumari ?????? 5 years, 8 months ago
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Meghna Thapar 5 years, 6 months ago
- Factors on which the Resistance of a Conductor Depends:
The resistance of a conductor is directly proportional to its length (l) and inversely proportional to its area of cross section (A).
R µ/l A
R = ρ I/A
where ρ is a constant of proportionality called specific resistance or resistivity of the material of the conductor.
The S.I. unit of resistivity is ohm metre (Ωm). The metals and alloys have very low resistivity in the range of 10–8 Ω m to 10–6 Ω m. They are good conductors of electricity. Insulators like rubber and glass have resistivity of the order of 1012 to 1017 Ωm. Both the resistance and resistivity of a material vary with temperature.
Posted by Diksha? 5 years, 8 months ago
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Posted by S U M A Y A J A N 5 years, 8 months ago
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Eniyadarshini Udayalikumar 5 years, 8 months ago
Posted by Amit Raj 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Ammeter: In series connection, the same current flows through all the components. Ammeter aims at measuring the current flowing through the circuit and hence, it is connected in series: so that the same current that is there in the circuit flows through it and gets measured.
Ammeter has a low resistance, because we do not want to change the current that is flowing through the circuit.
Voltmeter: A voltmeter measures voltage change between two points in a circuit. So u have to place the meter probes at these two points, without removing the portion of circuit between the probes (or else you change the circuit). This then, by definition, places the voltmeter in parallel with the section of circuit between the probes.
When you place the meter probes at the two points you want to measure, a tiny portion of the current in the circuit will now go thru the meter and give you a reading. We make the voltmeter a very high resistance instrument. So when the current splits into the meter the high resistance allows only a tiny amount of original current to split into the meter.
Posted by Sachin Yadav 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Raw materials are substances which cannot be directly utilized by the organisms. They require further processing inside the body like digestion in animals and photosynthesis in plants. CO2, water and minerals compounds are raw materials for plants while water, carbohydrate, protein, fat and vitamins are raw material for the animals. These raw materials are to be taken from outside by plants and animals, respectively.
Posted by Tamanna Jindal 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
- The kidney is a bean-shaped structure.
- The kidney is a bean-shaped structure.
- Internally, it is divided into an outer cortex and an inner medulla.
- The medulla is in the form of medullary pyramids.
- Medullary pyramids are projected into the calyces.
- The cortex which extends between the medullary pyramids is called columns of Bertini.
Posted by Anurag Rai 5 years, 8 months ago
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Posted by Pooja Kumari ?????? 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
resistance(R) is directly proportional(=) to length(l) ,
inversely proportional to area(A)
I) if length length is tripled I.e 3l
for initial R = l then what is the resistance(x) if length is 3l
then x= 3R
therefore resistance become triple time of initial
ll)R= 1/A = 1/(πr²)
2r =d ( diameter ) for initial
if diameter becomes triple
x= 1/(π(6r/2)²)
x = 1/(π/9r²)
x= 1/9(R)
I.e the resistance will decrease 9 times of initial
Posted by Pooja Kumari ?????? 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
When current I is passing through a resistor R, the electric power that generates heat is given by the formula I²R. so, P= I²R
Here P is power/heat produced,I is current and R is resistance.
P = (2.5)²X 200
= 6.25 x 200
= 1250 Watts.
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Yogita Ingle 5 years, 8 months ago
Balanced chemical equation : The equation which contains an equal number of atoms of each element on both sides of the arrow is called a balanced chemical equation.
2Mg + O2 → 2MgO
A balanced chemical equation must obeys the law of conservation of mass.
Unbalanced chemical equation : The equation in which the number of atoms of each element on both sides of the arrow is not equal.
H2 + O2 → H2O
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