Saved Bookmarks
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 54301. |
what is the main function of respiration in human being |
|
Answer» The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe. To oxidise the food material and provide energy The main function of respiration in human being is to produce energy for various life processes |
|
| 54302. |
Graphical representation of the pair of equation whose lines are interesting |
| Answer» \xa0x + y = 3; 2x + 5y = 12\xa0Sol:2x + 5y = 12We have,x + y = 3When y = 0 we have x =3When x= 0 we have y =3Thus we have the following table giving points on the line x+y =3\xa0\tX03Y30\t\xa0Now, 2+5y= 12= y =\xa012−2x5When x= 1, we have= y =\xa012−2(1)5\xa0= 4Thus we have the following table giving points on the line 2x+5y=12\xa0\tX1-4Y24\t\xa0Graph of the equation x+y =3 and 2x+5y=12 is\xa0\xa0Clearly two lines intersect at a point P (1,2)Hence x= 1 and y = 2 | |
| 54303. |
Why do copper vessels lose shine when exposed to air |
|
Answer» Thanx a lot to everyone ? When copper vessels are exposed to air then a green layer of carbonate is deposited on its surface due to which it loses shine When Copper vessel is exposed to air it losses it shine due to corrosion because a green coating is deposited on Copper. corrosion This is due to collision Due to the the black layer of copper carbonate formed over it. |
|
| 54304. |
What will be the maximum kinetic energy if wavelength is 360 angstrome |
| Answer» | |
| 54305. |
why molecular movement neccesary to live |
| Answer» Molecular movement is required to provide various essential molecules throughout the body of organisms for repairing and maintaining their structure . Life processes are need to maintaining functions of living organisms . 1)to provide food that provides energy and materials required to sustain life . | |
| 54306. |
Explain about internal sturucture of heart |
| Answer» The two auricles or atria are thin-walled and are separated from each other by a thin inter-atrial septum. The right atrium receives venous (deoxygenated blood having very little 02) from the entire body through a superior and inferior vena cava. The left smaller atrium receives oxygenated blood from the lungs through four pulmonary veins.The two auricles (atria) are separated from the ventricles by two apertures guarded by membranous valves. The valve separating right atrium from right ventricle is called right atrio-ventricular valve or tricuspid valve made up of three flaps. The valve separating left atrium from left ventricle is called left atrio-ventricular valve or mitral valve, formed of two flaps. These valves are attached with fine cords with the papillary muscles of the ventricular wall. These valves only allow blood flow from auricles into ventricles and not in opposite direction.Both the ventricles are separated from each other by a thick inter-ventricular septum. The wall of left ventricle is much thicker than that of right ventricle. The left ventricle pushes blood into aorta which supplies blood to entire body. The opening of aorta is also guarded by a valve formed of 3 semilunar flaps. The right ventricle pumps venous blood into lungs by a pulmonary aorta. Its opening is also guarded by a valve, having 3 semilunar flaps. These valves allow the flow of blood from ventricles into the aorta and not back. Heart is formed of cardiac muscle fibres, which rhythmically contract the heart without feeling fatigue. | |
| 54307. |
Functional unit of kidney |
|
Answer» Nephron Purify the blood To filter the dirty blood To filter the blood Nephron |
|
| 54308. |
Why soda acid fire extinguisher are also used to remove fire and how? |
|
Answer» Because it contains CO2 that extiguishes fire. But what is the process please tell me In soda acid CO2 is present which extinguishes ? fire. |
|
| 54309. |
Write mechanism of nephrons |
| Answer» Nephrons are the basic excretory unit which has a cut shaped end of a coil tube bowman\'s capsule which of BUNDLE of capillaries called glomerulus which filters the blood some of the substances passed into bowman\'s capsule as filter rate as glucose amino acid salts. When does filtrate passes Kudi nephron tubule they get reabsorbed in it in various tubules like proximal convoluted tubule where they are surrounded by blood capillaries due to which they get into blood filtrate the amount of water to be there for depends on the excess of the current in the body anddissolved is always to be excreted | |
| 54310. |
What is reabsorption in nephron |
| Answer» | |
| 54311. |
What is ultrafiltration in nephron |
| Answer» | |
| 54312. |
Somene tell the types of small intestine ...... |
| Answer» Duodenum , jejunum , ileum | |
| 54313. |
What are the last products remain after digestion of food |
| Answer» Amino acids,fatty acids, ans some undigested food. | |
| 54314. |
Gypsum is used in manufactur of cement.Give reason |
| Answer» During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process.Gypsum is added to control the setting of cement. | |
| 54315. |
What is the difference between magnet and electromagnet? |
|
Answer» \tPermanent magnetElectromagnet(i) A permanent magnet is a magnet forever. It will never lose its magnetism.(i) When the current is switched off the electromagnet loses its magnetism.(ii) The power of a permanent magnet can neither be increased nor decreased.(ii) Its power can be increased or decreased.(iii) Its use is limited.(iii) Its use is more widely spread.(iv) The South – North polarity of a permanent magnet is fixed and they cannot be changed(iv) The South – North polarity of a permanent magnet can be changed by changing the direction of the current in the coil.\t A magnet is the substance which acttract matel not use ing energy there are two types of magnet 1natural 2artfical magnets and electromagnet is start ed on by which passes the current on the wire the wires work as a magnet this magnet are called electromagnet |
|
| 54316. |
Science all activities |
| Answer» ????☁♿??????????????????????????????????????????????????????? | |
| 54317. |
Bleachin powder chemical formula preparation and defination |
|
Answer» Ca(oH)2+2cl= Caocl2+ H20Bleaching powder chemical formula is calcium oxichloride. It is used in paper and glass industry. When chlorine is passed through calcium hydroxide CaOCL2 |
|
| 54318. |
How to prepare hydrogen gas in laboratory? |
|
Answer» Hydrogen gas can also be produced by the electrolysis of water. ACID + METAL ----> SALT + H² |
|
| 54319. |
What is portfolio |
| Answer» A self-reflection is a process in which you look back on your science work and examine the strengths and weaknesses of the work. You will be choosing samples of your science work, reflecting back on it, and putting the items in your science portfolio. | |
| 54320. |
Define phagocytosis |
|
Answer» The process in which unicellular organism engulf it\'s food with the help of plasma membrane is known as phagocytosis. The process in which organisms feed upon solid substances with the help of plasma membrane in single cell |
|
| 54321. |
Notes kase benava science k |
| Answer» Read Ncert book thoroughly and then pick up the important reactions from chemistry , definitions from bio , Derivations from physicsand write it in your notes. It shold not be log ,to be short and simple . You can also write the frequently asked questions. | |
| 54322. |
How to form products if we are given only the reactants of a chemical equation?? |
| Answer» When reactants reacts it forms product automatic | |
| 54323. |
Which rules do we follow while giving name to conpounds... ??? |
| Answer» Agood and brief description is given in Ncert textbook. | |
| 54324. |
Why do we call Na2ZnO2 ------- sodium zincate |
| Answer» | |
| 54325. |
What is electric potential and what us electric potential energy... what is the diffrnc btw thmmm |
| Answer» | |
| 54326. |
Differences between inspiration and expiration |
|
Answer» TX jugal sahu bhai Inspiration:->The process of intaking of oxygen inside the body is called inspiration.>It is other wise known as inhalation.>In this process the intercostalmuscle ias flattened to the ribs of cartilage.Expiration:->the process by which the carbondioxideis came out by the nassal passage is called expiration.>It is other wise known as excalation.>In this process the intercostal muscle seen to squised. |
|
| 54327. |
Definition for neutral substance |
|
Answer» The substances which do not show any acidic or basic conditions are called neutral substances. The best example of a neutral substance is water. It is a substance that shows no acid or base properties , has equal no of hydrogen and hydroxyl ions and does not change colour of litmus paper. |
|
| 54328. |
Why is damage to ozone layer a cause for concern? What steps are being taken to limit this damage? |
| Answer» Ozone layer protects us from Sun’s harmful UV radiations. It shields the surface of the earth from ultraviolet (UV) radiation from the Sun. This radiation is highly damaging to organisms, for example, it is known to cause skin cancer in human beings.There is increased concern about the effect of ozone depletion. The depletion of ozone causes the harmful UV rays to reach the earth and this has resulted in increased incidence of skin cancers in humans. UV rays may also cause genetic mutations in living organisms.To limit the damage to the ozone layer, the release of CFCs into the atmosphere must be reduced. CFCs used as refrigerants and in fire extinguishers should be replaced with environmentally-safe alternatives. Also, the release of CFCs through industrial activities should be controlled. | |
| 54329. |
What do you mean by rancidity? |
|
Answer» Rancidity is a very general term and in its most general meaning, it refers to the spoilage of a food in such a way that it becomes undesirable (and usually unsafe) for consumption. The oxydation of oils and fats in food resulting into bad smell and bad taste. It refers to the change in taste and smell of food containing fats and oils due to keeping it in air for long. |
|
| 54330. |
Why do we prefer a convex mirror as rear view mirror in vehicles? |
| Answer» Convex mirror is preferred as rearview mirror in\xa0vehicles because it always forms virtual erect and diminished image. If also covers the wider field of view. | |
| 54331. |
How do living thing get their food |
|
Answer» *we Plants through photosynthesis and ww get through plants. Simple ? When plants carry out photosynthesis to make food they need four things; chlorophyll, energy from the sun, carbon dioxide from the air and water from the soil. Consumers are usually animals. Consumers cannot make their own food, so they have to eat other organisms. |
|
| 54332. |
Give difference between metals and non metals |
|
Answer» METALS-they are lustrous They are good conductors of heat and electricity Metals are good conductor of electricityand heat, non metals are poor conductor of electricity. Unlike non metals are ductile they can be streched into wires. |
|
| 54333. |
Define om law |
|
Answer» The potential difference (v) across the ends of a conductor is directly proportional to the current flowing through them if the provided temperature remains the same. Ohm’s Law : Potential difference across the two points of a metallic conductor is directly proportional to current passing through the circuit provided that temperature remains constant. At constant temperature , the current flowing through a conductor is directly proportional to the potential difference across its two ends . |
|
| 54334. |
What is the SI unit of electric charge?How many electron make one coulomb of charge? |
| Answer» SI unit of electric charge is Coulomb .6.25 electrons make 1 C of charge . | |
| 54335. |
What is the another name of caocl2 |
|
Answer» Bleaching powder Calcium oxide cloride |
|
| 54336. |
Suggest any book for preparation of 10th board exams. |
|
Answer» Ncert is always best Ncert is best ...?? NCERT |
|
| 54337. |
What will be the colour of phenolpthalein when hcl,h2so4,NH4OH is added to it |
| Answer» HCl - colourlessH2SO4-colourless NH4OH - pink | |
| 54338. |
Define respiratory system in human beings |
|
Answer» Respiratory system of human beings and other mammals consists of air passage or respiratory tract, a pair of lungs.Respiratory tract is made up of nasal cavity, pharynx, larynx, trachea and bronchi.\xa0\xa0The lungs are a pair of brownish grey coloured spongy structures situated in the thoracic cavity.The left lung consists of two lobes while the right lung consists of three lobes.Each lobule of a lung consists of bronchioles which terminate into a bunch of spherical thin-walled air sacs, called alveoli.Each alveolus or air has a diameter of 75 to 300 microns and has a very thin wall. The walls of the alveoli are elastic and are supplied with capillaries. Through these thin walls gases are exchanged between the capillaries and the air sacs. Sia how have u posted this... i mean to say the picture ???? |
|
| 54339. |
Calculate the energy transfer when 2 amper current flows through 10ohm resister for 30min |
| Answer» | |
| 54340. |
Project to study the properties of acid and base using litmus solution |
| Answer» | |
| 54341. |
Na means what |
|
Answer» Sodium? No... |
|
| 54342. |
Question and answer of chapter 1 |
|
Answer» Try to solve questions own u Check NCERT solutions here :\xa0https://mycbseguide.com/ncert-solutions.html |
|
| 54343. |
What is the near and far point of a normal eye |
|
Answer» For a young adult with a normal vision, the near point is\xa0about 25 cm\xa0and the far point of the eye is at infinity. A normal eye can see objects clearly that are\xa0between 25 cm\xa0and infinity. Near point of eye is 25cm and far point is infinity... |
|
| 54344. |
What is diostolic & siastolic pressure . |
| Answer» The diastolic blood pressure is the pressure the blood exerts within the arteries in between heartbeats, that is, when the heart is not actively ejecting blood into the arteries.When the heart is actively beating (an event called “systole”), it is ejecting blood out into the arteries. This dynamic ejection of blood into the arteries causes the pressure within the arteries to rise. The peak blood pressure reached during active cardiac contraction is called the systolic blood pressure. | |
| 54345. |
Name two Constituents biogas |
| Answer» Biogas is a mixture of 50 to 70% methane, 30 to 40% carbon dioxide, 5 to 10 % hydrogen, 1 to 2% nitrogen and traces of hydrogen sulphide. Biogas gives a flame temperature upto 8000C and burns with clear blue flame without smoke. Calorific value of gas is nearly 5,650 kcal/m3. Residue is very high quality manure for plants. | |
| 54346. |
Why enzymes called biological Catylist |
|
Answer» They increase the speed of reaction in our body Enzymes are soluble protein molecules that can speed up chemical reactions in cells. These reactions include respiration, photosynthesis and making new proteins. For this reason enzymes are sometimes called biological catalysts. |
|
| 54347. |
If field lines of magnetic field are crossed at a point, what does it indiotes |
| Answer» It indicates that it has two forces which means when compass is placed near it it will show 2 north like direction which is never possible. | |
| 54348. |
Why do carnivores have shorter alimentary canal ? |
|
Answer» Carnivores eat a smaller amount of food compared to herbivores, and it is in the form of high energy molecules which are relatively easy to digest, compared to the plant material that herbivores eat, which contains cellulose. Therefore, carnivores have a smaller intestine. Because in them the absorption of food is fast, |
|
| 54349. |
How kidney perform filtration of blood in our body |
| Answer» The functioning of the kidneys is efficiently monitored and regulated by hormonal feedback mechanisms involving the hypothalamus, JGA and to a certain extent, the heart.\tOsmoreceptors in the body are activated by changes in blood volume, body fluid volume and ionic concentration. An excessive loss of fluid from the body can activate these receptors which stimulate the hypothalamus to release antidiuretic hormone (ADH) or vasopressin from the neurohypophysis. ADH facilitates water reabsorption from latter parts of the tubule, thereby preventing diuresis.\tAn increase in body fluid volume can switch off the osmoreceptors and suppress the ADH release to complete the feedback. ADH can also affect the kidney function by its constrictory effects on blood vessels. This causes an increase in blood pressure. An increase in blood pressure can increase the glomerular blood flow and thereby the GFR.\tThe JGA plays a complex regulatory role. A fall in glomerular blood flow / glomerular blood pressure/ GFR can activate the JG cells to release rennin which converts angiotensinogen in blood to angiotensin I and further to angiotensin II. Angiotensin II, being a powerful vasoconstrictor, increases the glomerular blood pressure and thereby GFR. Angiotensin II also activates the adrenal cortex to release Aldosterone. Aldosterone causes reabsorption of Na+ and water from the distal parts of the tubule. This also leads to an increase in blood pressure and GFR. This complex mechanism is generally known as the Renin-Angiotensin mechanism.\tAn increase in blood flow to the atria of the heart can cause the release of Atrial Natriuretic Factor (ANF). ANF can cause vasodilation (dilation of blood vessels) and thereby decrease the blood pressure. ANF mechanism, therefore, acts as a check on the renin-angiotensin mechanism. | |
| 54350. |
What is nonmetal |
|
Answer» Non metal is those substance which break easily Non metal are non ductile non sonorus non mallable non lustrus,they have low melting point,low density they don\'t conduct electricity those substance which gain electron and form negative ion then this substance is known as metal A metal which donot conduct heat & eletricity and donot react with metal is called non metal. Non-metals- The elements which are brittle, non-lustrous and are bad conductors of heat and electricity. |
|