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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.
| 3301. |
If the formula of water is H20 then why can\'t we combine hydrogen and oxygen and make water |
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Answer» We don\'t have sufficient technology to that socially We need 1 mole of hydrogen and 2 mole of oxygen to form a drop of water So we don\'t have enough hydrogen and oxygen to make water |
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| 3302. |
What are anode ray |
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Answer» Positively charged rays An\xa0anode ray is a beam of positive\xa0ions that is created by certain types of\xa0gas discharge tubes |
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| 3303. |
What are cathode ray |
| Answer» a beam of electrons emitted from the cathode of a high-vacuum tube. | |
| 3304. |
Application and principle of various separation techniqe |
| Answer» Separation of MixturesNot everyone is out searching for gold (and not many of those searchers is going to get much gold, either). In a chemical reaction, it is important to isolate the component(s) of interest from all the other materials so they can be further characterized. Studies of biochemical systems, environmental analysis, pharmaceutical research – these and many other areas of research require reliable separation methods.Here are a number of common separation techniques:ChromatographyChromatography\xa0is the separation of a mixture by passing it in solution or suspension or as a vapor (as in gas chromatography) through a medium in which the components move at different rates. Thin-layer chromatography is a special type of chromatography used for separating and identifying mixtures that are or can be colored, especially pigments.DistillationDistillation\xa0is an effective method to separate mixtures comprised of two or more pure liquids. Distillation is a purification process where the components of a liquid mixture are vaporized and then condensed and isolated. In simple distillation, a mixture is heated and the most volatile component vaporizes at the lowest temperature. The vapor passes through a cooled tube (a condenser), where it condenses back into its liquid state. The condensate that is collected is called distillate.Figure 2.11Distillation apparatus.In the\xa0Figure\xa0above\xa0, we see several important pieces of equipment. There is a heat source, a test tube with a one-hole stopper attached to a glass elbow and rubber tubing. The rubber tubing is placed into a collection tube which is submerged in cold water. There are other more complicated assemblies for distillation that can also be used, especially to separate mixtures, which are comprised of pure liquids with boiling points that are close to one another.EvaporationEvaporation\xa0is a technique used to separate out homogenous mixtures where there is one or more dissolved solids. This method drives off the liquid components from the solid components. The process typically involves heating the mixture until no more liquid remains, Prior to using this method, the mixture should only contain one liquid component, unless it is not important to isolate the liquid components. This is because all liquid components will evaporate over time. This method is suitable to separate a soluble solid from a liquid.In many parts of the world, table salt is obtained from the evaporation of sea water. The heat for the process comes from the sun.Figure 2.12Once the sea water in these evaporation ponds has evaporated, the salt can be harvested.FiltrationFiltration\xa0is a separation method used to separate out pure substances in mixtures comprised of particles some of which are large enough in size to be captured with a porous material. Particle size can vary considerably, given the type of mixture. For instance, stream water is a mixture that contains naturally occurring biological organisms like bacteria, viruses, and protozoans. Some water filters can filter out bacteria, the length of which is on the order of 1 micron. Other mixtures, like soil, have relatively large particle sizes, which can be filtered through something like a coffee filter.Figure 2.13Filtration. | |
| 3305. |
Differences between RBC and WBC |
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Answer» Actually your description is not convinent for exam point of view What is your name where are you live I live in Chaksu I am khushi RBC are those cells which helps to transport the nutrients, oxygen and other important minerals through blood.Whereas WBC protects the body from foreign substances which must be killed like bacteria, pathogens, etc. Isme thanks ki kya bat h mujhe Aya to Mene bra diya RBC is the nerves which has hemoglobin but WBC is not have hemoglobin |
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| 3306. |
What is the difference between force and weight |
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Answer» F=ma and W=mg I hope this helps you Force\xa0is any interaction that alters the motion of an object. It is a \'push\' or \'pull\' action upon an object, resulting from the object\'s interaction with another object.Weight\xa0is the force of gravity, which is the pull of the Earth on an object. The direction of the force of gravity is downwards towards the centre of the Earth. As mentioned earlier when two objects interact they exert equal and opposite forces. |
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| 3307. |
What is the difference between mass and momentum |
| Answer» Mass :- It is the quantity of matters in our body. It is denoted by m. It didn\'t vary from place to place. Momentum:- It is the product of mass and velocity.... P=m*a. . PlZz Like | |
| 3308. |
How to find valency and molecular mass |
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Answer» The valency can be calcualted by electronic configuration- 1s²,2s²,2p⁶, 3s²,3p⁶,4s²,3d¹⁰,,..... For example in the case of oxygen it has atomic no.-8, So from the above formula(electronic configuration) Oxygen-8(atomic no.)1s²,2s²,2p⁴2,2+4=2,6Thus ,no. Of eletrons in the last shell is called valency so, 6 is valency The maximum no. Of electrons an element can either gain, loose or share as per its energy is called valence.Molecular mass is simple. It is the mass(atomic mass) of all the molecules of an element . Given the\xa0valence\xa0of two elements,\xa0find\xa0the least common multiple of the absolute value of the\xa0valence. Then divide the least common multiple by the absolute value of the\xa0valence\xa0to\xa0find\xa0the number of atoms in the\xa0molecule. (2) The oxygen element usually shows -2\xa0valence.29-Jan-2020 |
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| 3309. |
Calculate the number of aluminium ions present in 0.051 g |
| Answer» 6.022× 10^ 20 | |
| 3310. |
Write univesal law of gravitation? |
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Answer» Every object in this universe attract with each other which is directly proportional to distance between them and inversely proportional to the square between them.???? Newton\'s Law of Universal Gravitation states that every particle attracts every other particle in the universe with a force that is directly proportional to the product of the masses and inversely proportional to the square of the distance between them. |
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| 3311. |
Difference between mixture and compound in a very simple wat |
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Answer» Mixtures =1) elements or compounds just mix together to form a mixture and no new compound is formed 2)a mixture has a variable composition 3) a mixture shows the properties of the constituent substance 4)the constituents can be seperated fairly easily by physical methodsCompounds = 1) element react to form new compounds 2) the composition of each new substance is always fixed 3) the new substance has totally different properties 4) the constituents can be separated only by chemical or electrochemical reactions When two matters are mixed it form mixture. If two element are mixed then it is compound When two or more elements or compound mixed in any proportion said to be mixture.But when two or more elements react form compound. Mixture is impure but element is pure |
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| 3312. |
Why the electrons revolving in definite orbit does not radiate its energy?? |
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Answer» Actually when a electrons revolving in a definite orbit its radiate its energy suppose a electron is at M shell it revolves then it radiate energy it fall down to L shell then K shell at the last of it unit of its energy losses uis falls to the nucleus of the atom and this become negligible. THANK YOU FOR A GOOD QUESTION If you are moving does you radiate energy.no,because if you are at rest you can radiate energy that time |
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| 3313. |
Write a method to separate a mixture of salt and ammonia chloride. |
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Answer» We can seperate the\xa0mixture\xa0of\xa0ammonium chloride\xa0and\xa0salt\xa0through sublimation process. The process by which the change of gaseous state directly to solid state without going through liquid state, and vice versa. Sublimation is the\xa0method\xa0of separation used to\xa0separate a mixture of salt and ammonium chloride. Sublimation Sublimation |
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| 3314. |
Calculate the mass of 10 moles of oxygen |
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Answer» No. of moles=10,atomic mass of oxygen=16 find massFormula:No. of moles=given mass/molar mass10=mass/1610×16=massMass=160 gHope it helped you? Let mass be x Atomic mass of oxygen = 16gGiven moles = 10 So, No of moles = given mass/ molar mass 10= x/16Through cross multiplicationX= 16×10= 160 gHope it helps you |
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| 3315. |
What is the criterion for classification the of in Monera kingdom and protist kingdom |
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Answer» Paper hai no No The main criteria for the classification of monera and protista is based on the present and absence of definite nucleus. |
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| 3316. |
Chapter 11 1st blue question |
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Answer» W=F×sSo to do work we have to apply force on object and by this force object should be displaced in the direction of force Q. A force of 7 N acts on an object. The displacement is, say 8m, in the direction of the force. Let us take it that the force acts on the object through the displacement. What is the work done in this case?F=7NS=8mW=?W=F×SW=7×8W=56 |
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| 3317. |
What is difference between mass and weight ?? |
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Answer» Definition\t• Mass is simply the measure of the amount of matter in a body.• Weight is the measure of the amount of force acting on a mass due to acceleration due to gravity.Denotation\t• Mass is denoted by “M”.• Weight is denoted by “W”.Formula\t• Mass is always constant for a body and there are several formulas to calculate mass.• One way to calculate mass is:Mass = volume × densityWeight is the measure of the gravitational force acting on a body.Weight can be calculated from the following formula:Weight = mass × acceleration due to gravityQuantity Type\t• Mass is a base quantity.Mass only has magnitude and so, it is a scalar quantity.• Weight is a derived quantity.Weight has both magnitude and direction (towards the centre of gravity) and so, it is a vector quantity.Unit of Measurement\t• The SI unit of mass is Kilogram (Kg).• The SI unit of weight is Newton(N). Gravitational Effect\t• Mass does not depend upon gravity and is constant everywhere.Mass can never be zero.• Weight is dependent on gravity and so, it varies from place to place.Weight can be zero where there is no gravity (like space).Measuring Instrument\t• Mass can be easily measured using any ordinary balance like beam balance, lever balance, pan balance, etc.• Weight can be measured by a spring balance or by using its formula. Mass of an object is measure with interia but Weight of an object is the force which is attracted to word the earth Mass is scalar but weight is vector quantity. Mass is constant while weight changes according to place. Mass the is the amount of matter in the object. Its SI Unit is M. Mass is neither be zero. Weight is product of mass and gravity. Its SI Unit is N. Weight can be zero if accerlation due to gravity is zero Mass :-mass is the amount of "matter" in an object . Weight :-weight is the force exerted on an object by gravity. ... Objects on the surface of the Earth have weight. |
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| 3318. |
Why Covid becomes more dangerous in Co Morbidity ? |
| Answer» I don\'t know | |
| 3319. |
What happens if Hemoglobin does not function properly ? |
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Answer» We will die as it gives colour to our blood and help in formation of blood. so if hemo globlin is absent in our body then there will be lack of blood and its.colour, which is in red. |
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| 3320. |
Why Covid Spread more in Co Morbidity ? |
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| 3321. |
Tissue is a: |
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Answer» Group of celll Tissue is a group of cell that have a common origin and performs a common function |
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| 3322. |
Why are the cells of meristematic tissues lack of vacuoles |
| Answer» Because their only function is to increase in their organs a d body parts | |
| 3323. |
Define Vaccination...Class 9 ... why do we fall ill...pl tell its answer |
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Answer» Vaccination is a biologically prepared product which contains typical agents resembling a microorganism that causes diseases, made from weakened or dead forms of the microbes, one of its surface proteins or its toxic Vaccination is the preparations for the prevention of disease earlier Vaccination is a preparation that improves immunity to a particular disease. It is a biologically prepared\xa0product which contains typical agents resembling a microorganism that causes diseases, made from weakened or dead forms of the microbes, one of its surface proteins or its toxic |
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| 3324. |
Why do meristematic tissue lack vacuoles? |
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Answer» Because of continuously dividing Merstimatic tissues lack vacoules due to because they are continuously dividing so, they didn\'t need for any storage hence we know that function of vacoules is used for storage °• |
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| 3325. |
What is the electric confricasion of oxygen |
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Answer» Electronic configuration of oxygen means O2 will be 2,6 in K,L because we all know that atomic no.of oxygen is 8 so first of all it will fill the K shell that is 2 and after that it will fill the L Shell that is 6 .But in case of S,P,D,F the electronic configuration will be 1s² 2s² 2p⁴ that is 2+ 2+4 is= 8. [He] 2s² 2p⁴ K orbit me 2electron l me 6 K L2 6 |
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| 3326. |
Science it 2 mae ch=5,8 ayege |
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| 3327. |
How big are atoms ? |
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Answer» They are nearly of 1nm Atom are smallest among all with which we compare or imagine it.size of atom be 1nm=10^-9m Smaller than these (.) Please help |
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| 3328. |
Rutherford alpha particle scattering experiments showed that |
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Answer» in your science ncert book? . Rutherford\'s alpha particles scattering showed the three major function of the nucleus1) Since most of the alpha particles pass straight, this show that the nucleus has lots of space in it. 2) Since some alpha particles deflects to smaller and larger angles, this shows that the nucleus is a positively charged particles. 3) Since most of the alpha particles rebounds in the same path, this shows that the nucleus is very hard and dense. Experiment were then carried or to find out how electron proton and neutron were arranged in an atom . It was Rutherford\'s alpha particles scattering experiment which led to the discovery of a small positively charged particles containing all the protons and neutrons. When fast moving alpha particles are allowed to strike a very thin gold foil in vaccum it is found that 1‐most of the alpha particles pass straight through the gold foil without any deflection from their original path. 2‐a few particles are deflected through small angles and a few are deflected through large angles.3‐a very few alpha particles completely rebound on hitting the gold foil and turn back on their path. |
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| 3329. |
Why are antibiotics effective against bacteria but not against viruses? Explain |
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Answer» Antibiotics helps in stopping the usage of bio- chemical activities by the bacterias only. Virus enter the human body and uses the host cell. This would harm their own human body. That is the reason antibiotics are effective against bacteria only Antibiotics cannot kill viruses because viruses have different structures and replicate in a different way than bacteria. Antibiotics work by targeting the growth machinery in bacteria (not viruses) to kill or inhibit those particular bacteria. |
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| 3330. |
Numerical related with PE=mgh |
| Answer» | |
| 3331. |
Explain Bohr\'s model of an atom |
| Answer» An atom consists of heavy positively charged nucleus. The whole mass of the atom is concentrated in the nucleus.The electrons in an atom revolve around the nucleus in definite circular paths called orbits or energy level.Each energy level is associated with definite amount of energy.\xa0The change in energy takes place when electron jumps from one energy level to another energy level. | |
| 3332. |
Can we reproduct on 15 year. |
| Answer» Yes | |
| 3333. |
Under what conditions is the . magnitude of average velocity of an object is equal to average speed |
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Answer» Linear motion When displacement is equal to distance travelled When they are in straight line he wer sa that |
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| 3334. |
What is biogeochemical |
| Answer» any of the natural pathway by elements of living matter are circulated | |
| 3335. |
what is chronic diseases |
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Answer» Chronic diseases are thise disease which lasts for a long time in our body...Some of chronic diseases are listed below-:1) Respiratory disease.2) Pneumonia.3) Tuberculos.4) Asthma.5) Arthritis. Chronic diseases are long time to recover. Example=cancer, thyroid etc. Chronic diseases are long terms disease . Like a diabetes Long durational diseass Chronic diseases are long lasting disease which effects body dramatically,like cancer, Diabetes etc. |
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| 3336. |
Timetable for class 7 |
| Answer» आप क्लास सेवंथ में तो आपको 2 घंटे साइंस 2 घंटे में एक एक घंटा को सोशल साइंस इंग्लिश हिंदी पर बिताना है ठीक है | |
| 3337. |
What is the charge of alpha particles? Give suitable reason according rutherford experiment ? |
| Answer» Alpha particles are positively charged particles | |
| 3338. |
Why virus is don\'t show characteristics of life untill they enter in living body |
| Answer» Because viruses are non cellular organisms they do not contain any cell hence do not show characteristics of life until they enter a living body and use it\'s machinery to reproduce | |
| 3339. |
How do substance like Co2 and water in and out of cell ? |
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Answer» By process of diffusion and osmosis respectively Osmosis , Diffusion By process of osmosis water molecules move in and out of the cell |
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| 3340. |
Define the term "tissue" |
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Answer» Group of cell is called tissue A group of cells that are similar in structure and/or work together to achieve a particular function forms a tissue A group of cells that has a similar structure and/or work together to achieve a particular function is called a tissue. When 2 or more cell bound together. This is tissue. The structural unit of an organism |
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| 3341. |
In case of zero work, the angle between the force and displacement isa) 0 ° b) 45° c) 90° d) 180° |
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Answer» 90 degree 90° 90° 90 Angle 90 degree |
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| 3342. |
What are the limitations of Rutherford Model of an atom? |
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Answer» Rutherford did not mention anything about the arrangement of electron in the orbit. Rutherford’s model was inadequate to explain the stability of an atom Rutherford\'s model\xa0was inadequate to explain the stability of an\xa0atom. It did not mention anything about the arrangement of electron in the orbit. |
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| 3343. |
Ya phir yeh bta do ki kha se download karo freee |
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| 3344. |
Devaki Deepak naam pragati prani Nadi kisne prastav ki thi |
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| 3345. |
What is modi |
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Answer» Modi is the man who is taking India to extreme poverty. He wants to make India English free Modi is pm of india , in hindi which means vikas Modi is man who develops the country Man of developing india |
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| 3346. |
a train starts from rest and accelerates uniformly at the rate of 5m/s for 5 sec |
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Answer» So what to do What we have to find in this que ? |
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| 3347. |
Raju covered banglore to chennai 350 km in 7 hours calcucate his average speed |
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Answer» Average speed = total distance / total time taken = 350/ 7 = 50 m/s 50km/h |
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| 3348. |
Which of the following are true for an element |
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| 3349. |
What is surface phenomenon and bulk phenomenon? |
| Answer» Surface phenomenon= Evaporation Bulk Phenomenon = Boiling | |
| 3350. |
what are the three subatomic particles ? |
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Answer» Electron, proton and neutron Electrom,proton,neutron Proton,electron and neutron |
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