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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.
| 68451. |
Explain how blood groups are inherited |
| Answer» Blood group in humans are inheritable traits and inherited from parents to offspring on the basis of Mendel\'s law. That group inheritance depends upon the genes received from parents. Genes controlling blood group in man are 3 instead of two and are known as multiple alleles. All these three genes or the allele are located on the same locus on chromosomes. A person can have only two of these three genes at a time which may be either similar or dissimilar in nature. These genes control the production of blood group antigen in the offspring. | |
| 68452. |
Right hand law |
| Answer» Right hand Thumb RuleIf a current carrying conductor is imagined to be held in right hand such that thumb points in direction of current,then curled fingers of hand indicate the direction of magnetic field.If current flows in upward direction then direction will be anticlockwise.If current flows in downward direction then direction will be clockwise. | |
| 68453. |
How do Mendel\' s experiments show that traits may be dominant or recessive |
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Answer» Mendel selected true breeding tall (TT) and dwarf (tt) pea plants.When a tall pea plant is crossed with a short (dwarf) pea plant, all the F1 hybrids are tall. (i.e., in this case, the gene causing tallness is dominant while the gene causing dwarfness is recessive.).The trait expressing itself in the hybrid is the dominant one.\xa0(Mendel’s first law of inheritance states that when a pair of contrasting factors is brought in a hybrid, one factor inhibits the appearance of the other. The one which inhibits is the dominant one and which is inhibited is recessive.)\xa0 Mendel conducted the experiments using\xa0Pisum sativum\xa0or pea plant.He\xa0selected homozygous tall (TT) and dwarf (tt) pea plants.He crossed the tall pea plant with the dwarf pea plant.It was observed that the F1\u200b\xa0generation are all tall plants.Thus, it was concluded that the gene causing tallness is dominant while the gene causing dwarfness is recessive.The trait expressing itself in the hybrid is the dominant one.\xa0This experiment proves Mendel’s first law of inheritance. |
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| 68454. |
Why should a magnesium ribbon be cleaned before burnning in air |
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Answer» magnesium ribbon should be cleaned or rubbed with a sand paper .. because all the unwanted impurities are removed and we burn only pure magnesium metal hope it helps you ? The magnesium ribbon should be cleaned to remove the protective layer of magnesium oxide so that it may burns rapidly The magnesium ribbon should be cleaned before burning in the air because the layer of magnesium oxide (which is formed due to the reaction of magnesium with air ) can be removed in order to get the desired chemical reaction.\xa0Also in order to remove the oxide layer, the presence of which slowdowns the oxidation process. So, by cleaning it, the burning process takes place easily. Here is your ans:-) |
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| 68455. |
What is the use of breaking soda |
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Answer» Yes ????? Thanks for Answer (1) It is used as an\xa0antacid\xa0in medicine to remove acidity of the stomach. (2) It is used in making baking powder. Baking powder is a mixture of baking soda and a mild edible tartaric acid. When baking soda mixes with\xa0water,then\xa0sodium hydrogen carbonate\xa0reacts with tartaric acid to evolve carbon dioxide gas. \tBaking soda (sodium hydrogencarbonate) undergoes reaction with mild edible acid such as tartaric acid to manufacture baking powder. This baking powder on heating undergoes following reaction.\tThis carbon-dioxide produced makes bread or cake rise thereby making them soft and spongy.\tBeing alkaline it is also an active ingredient in antacids that acts by neutralising the excess acid produced in the stomach.\tIt is also used in soda-acid fire extinguishers. |
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| 68456. |
Only one half of water molecule is shown in the formula of plaster of Paris. Why |
| Answer» It is in the form of a white powder. When the powder of Plaster of Paris is mixed with water, it becomes hard and solid gypsum. ... In , only half a water molecule is shown as the water of crystallization because two molecules of CaSO4 share one molecule of wateror\xa0Formula of plaster of Paris is CaSO4.1/2 H2OIt is not possible to have half a molecule of water.The formula CaSO4.1/2 H2O over here actually means that two molecules of CaSO4\xa0share one molecule of water.The formula of plaster of Paris can also be written as 2CaSO4. H2O. | |
| 68457. |
Do i have to write the entire procedure in the biology ? Class 10 |
| Answer» No | |
| 68458. |
Rasode m kon tha |
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Answer» Pls don\'t take board exams lightly.Be serious. ?????? Yahi sab karo bas Tere maa ? ?? |
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| 68459. |
Aromatic compounds. |
| Answer» Aromatic compounds are those which contain at least one benzene ring.BENZENE – Hexagon of Carbon atoms with 3 alternate double Bonds.\xa0 | |
| 68460. |
State the causes of refraction . |
| Answer» The cause of refraction of light is that light travels with different speeds in different media. This Change in the speed of light when it moves from one medium to another causes it to bend. | |
| 68461. |
Is focal length positive or negative in convex mirror. |
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Answer» Focal length\xa0formula for\xa0mirror\xa0is 1/F=1/V+1/u, where V is the\xa0distance\xa0from pole to image and u is the\xa0distance\xa0from pole to object. Here we use sign conventions.\xa0Focal length\xa0is\xa0positive\xa0for a\xa0concave mirror\xa0and\xa0negative\xa0for\xa0convex mirror. It is neither positive nor negative |
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| 68462. |
Reduce syllabus of cbse 10 in detailed all subject |
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Answer» You can check it on:— cbseacademics.nic.in ,go to circulars icon and then, find the reduced syllabus Considering the loss of classroom teaching time due to the Covid-19 pandemic and lockdown, CBSE reduced the syllabus of classes 9 to 12 with the help of suggestions from NCERT.The CBSE syllabus has been rationalized keeping intact the learning outcomes so that the core concepts of students can be retained.Click on the given link for\xa0Revised Curriculum for the Academic Year 2020-21\xa0 |
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| 68463. |
Give the circuit symbol of the following cell battery resistance open key closed key? |
| Answer» Open key | |
| 68464. |
Hindi meaning of methyl bromide |
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Answer» Ok thanks? Their is no hindi meaning of it. |
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| 68465. |
What is the law of reflection |
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Answer» The\xa0law of reflection\xa0states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of\xa0reflection. Reflection of light\xa0is the phenomenon of bouncing back of light in the same medium on striking the surface of any object.• The two laws of reflection are: (i) the incident ray, the reflected ray and the normal (at the point of incidence), all lie in the same plane. (ii) the angle of reflection (r) is always equal to the angle of incidence (i) ∠r\xa0= ∠i \tThe law of reflection defines that upon reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray, with respect to the normal to the surface that is to a line perpendicular to the surface at the point of contact.\tThe reflected ray is always in the plane defined by the incident ray and the normal to the surface at the point of contact of the incident ray. |
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| 68466. |
What type is metal hydrides- salt, acid or base? |
| Answer» Basic | |
| 68467. |
Explain the chemical reaction pf Aqua regia with Gold/silver/copper/platinum? |
| Answer» The term ‘aqua regia’ is Latin for ‘royal water’.Aqua regia is a very strong acid formed by the combination of concentrated nitric acid and concentrated hydrochloric acid, both of which are strong acids.It is generally used to remove metals like gold and platinum from substances, especially in microelectronics and micro-fabrications labs.It is usually a yellow, reddish-orange, fuming liquid and has a rapidly changing composition.It is primarily popular for its ability to dissolve gold, palladium and platinum, all of which dont react easily with chemicals.\xa0The reason aqua regia can dissolve gold (and metals like platinum and palladium) is that each of its two component acids(i.e., hydrochloric acid and nitric acid) carries out a different function. While nitric acid is an excellent oxidizing agent, the chloride ions from the HCl form coordination complexes with gold ions, thereby removing them from the solution.\xa0The reduction of the concentration of Au3+\xa0ions shifts the equilibrium towards the oxidized form.\xa0The gold present in aqua regia dissolves completely to form chloroauric acid (HAuCl4). | |
| 68468. |
Bleaching powder is used in the manufacturing of chloroform. Explain the process? |
| Answer» Bleaching powder is needed in the manufacture of chloroform. Bleaching powder\xa0(CaOCl2\u200b)\xa0supplies the necessary chlorine and slaked lime (calcium hydroxide).CaOCl2\u200b+H2\u200bO→Ca(OH)2\u200b+Cl2\u200bA paste of bleaching powder in water is distilled with ethanol or acetone to obtain chloroform. | |
| 68469. |
Explain the process of hydrolysis? |
| Answer» Hydrolysis is a common form of a chemical reaction where water is mostly used to break down the chemical bonds that exists between a particular substance.The general formula of a hydrolysis reaction is:AB+H2O→AH+BOH | |
| 68470. |
Chemical formula of PVC (Poly-vinyl chloride)? |
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Answer» (C2H3CI)n Polyvinyl chloride is produced by\xa0polymerization\xa0of the\xa0vinyl chloride\xa0monomer\xa0(VCM), as shown. |
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| 68471. |
What are radicals ? |
| Answer» \xa0Radical Radical is an atom or a group of atoms of same or different elements which behaves like a single atom with a positive or a negative charge on it.\xa0 Radicals have their own combining power based on which they form chemical formulae.\xa0\xa0Example:\xa0 NH4+,\xa0Na+, NO3−,\xa0SO42−\xa0 | |
| 68472. |
Chemical formula of TNT (Tri-nitro Toluene) |
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Answer» The full form of TNT is Trinitrotoluene. TNT is a yellow solid that is often seen as a reagent in the chemical synthesis process but is commonly known for being an explosive substance with smooth handling characteristics.\tChemical formulaC6H2(NO2)3CH3TNT also called as2,4,6-trinitrotoluene, 2,4,6-Trinitromethylbenzene, 2,4,6-Trinitrotoluol.\t C7H5N3O6 |
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| 68473. |
What\'s the general name for carbon tetrachloride (CCl4)? What\'s its use? |
| Answer» Carbon tetrachloride, also known as tetrachloromethane, is an organic compound with the chemical formula\xa0CCl4. This compound is often classified as a polyhalogenated organic compound since it consists of a\xa0carbon\xa0atom which is attached to more than one halide functional group. | |
| 68474. |
What is isopentane |
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Answer» Thanks Isopentane, also called methylbutane or 2-methylbutane, is a branched-chain saturated hydrocarbon with five carbon atoms, with formula C ₅H ₁₂ or CH ₂. Isopentane is an extremely volatile and extremely flammable liquid at room temperature and pressure. It is also the least dense liquid at standard conditions. |
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| 68475. |
Tumhe kehena tha ki uska answer kya hai |
| Answer» kis ka ? | |
| 68476. |
Write the name and structure of an alcohol with three carbon atom in it molecule |
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Answer» Propanol(C3H7OH) See ncert book class 10 chemistry in carbon it\'s compound |
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| 68477. |
What is isomear in carbon it\'s compound class 10 |
| Answer» \xa0Compounds having the same molecular formula but different structural formula are known as isomers and the phenomenon as Isomerism.Isomerism can be explained by taking two compounds butane and isobutane both of which have the molecular formula C4H10. | |
| 68478. |
Friends can any one say about dwarf stars.gaurav seth can you answer it? |
| Answer» Dwarfs - Smaller stars are called dwarf stars. Red and yellow stars are generally called dwarfs. A brown dwarf is one that never quite got large enough for nuclear fusion to occur. A white dwarf is the remnants of the collapse of a red giant star. | |
| 68479. |
What is ammeter? |
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Answer» It is instrument which is used for measuring electric current An ammeter is a device which measure the electric current and it is always connected in series an instrument for measuring electric current in amperes. An ammeter is a device (instrument) used for measuring large electric currents in ‘ circuits. For this purpose, it is put in series with the circuit in which the current is to be measured.For accurate measurement, an ammeter must have following two properties:\tA very small resistance (zero in ideal case).\tA very large current carrying capacity.It is done by connecting low resistance in parallel with the coil of the galvanometer. This parallel low resistance is called shunt. The shunt reduces the overall resistance of the ammeter and increases its current carrying capacity. |
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| 68480. |
Metal oxides are |
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Answer» Metal oxide formed due to the reaction between metal and oxygen. Metal oxide are basic in nature .It turns red litmus to blue. Basic in nature Metal oxide are those oxide which is formed when oxygen react With metal. For example : Iron react with oxygen to form iron/ferous oxide (2Cu + O2 = 2CuO) Metallic oxides: A chemical compound formed by metal and oxygen.Examples:\tMagnesium reacts with oxygen to form magnesium oxide2Mg + 2O2→ 2MgO\tOther examples of metallic oxides – Na2O, Al2O3, FeO, CuO, V2O5 |
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| 68481. |
Why copper does not burn but the hot metal is coated with a black coloured layer of copper oxide |
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Answer» Copper metal when exposed to hearing in air, oxygen reacts with copper surface forming thin layer of copper oxide over it. ... This layer being coated on pure copper, protects it from oxygen. Therefore, whole copper doesn\'t burn, instead black coat of copper oxide is formed over it. At normal temperature, the surface of copper is covered with copper oxide. The thin layer of copper oxide is a protective cover which protects copper from further oxidation. Thus this copper oxide does not burn as it is already reacted with the oxygen in the air. No further oxidation can occur. This is because copper is active when hot. So when heated Cu is exposed to the atmosphere, it combines with atmospheric O2 , forming CuO which is black in colour |
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| 68482. |
An element x(atomic no 17)reacts with an element y (atomic no 20)to form a divalent halide |
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Answer» a) X belongs to Group 17 and 3rd periodY belongs to Group 2 and 4th periodb) X-Non-metal and Y metalc) Basic oxide; Ionic bonding a) X belongs to Group 17 and 3rd period\xa0Y belongs to Group 2 and 4th periodb) X-Non-metal and Y metalc) Basic oxide; Ionic bonding  X belongs to Group 17 and 3rd period Y belongs to Group 2 and 4th period X-Non-metal and Y metal Basic oxide; Ionic bonding |
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| 68483. |
In which biochemical form the photosynthate moves in phloem tissue?answer |
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Answer» Photosynthate moves in the phloem in the form of sucrose. Explanation: The final product of photosynthesis is glucose. These sugars are essential for the plant growth and need to be transported to the lower parts of the plants through the phloem. Photosynthate moves in the phloem in the form of\xa0sucrose.The final product of photosynthesis is glucose. These sugars are essential for the plant growth and need to be transported to the lower parts of the plants through the phloem.These sugar are transported through phloem in the form of\xa0dissolved sucrose\xa0rather than glucose because sucrose is\xa0less reactive\xa0than glucose. |
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| 68484. |
Haw many parts in human being |
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Answer» Plz complete your question then ask I thik his question is incomplete 9 Altogether there are seventy-eight main organs within the human body. These organs work in coordination to give rise to several organ systems. Among these 78 organs, five organs are considered as vital for survival.isted below are the tabular columns of 78 different types of organs of the human body.\tAdrenal GlandsHeartPancreasThymus GlandTestes****HypothalamusPineal GlandThyroidEpididymisAppendixJointsParathyroid GlandsTracheaVas deferensBladderKidneysPharynxTongueSeminal vesiclesBonesLarge IntestinePituitary GlandUretersBulbourethral glandsBone MarrowLarynxProstateUrethra*****BrainLiverRectumUterus*******BronchiLungsSalivary GlandsNervesSubcutaneous tissueDiaphragmLymph NodesSkeletal MusclesLigamentsForamen OvaleEarsMammary GlandsSkinTendonsArteriesOesophagusMesenterySmall Intestine********VeinsEyesMouthSpinal Cord******CapillariesFallopian TubesNasal CavitySpleenVulvaLymphatic vesselGallbladderNoseStomachCerebellumTonsilsOlfactory epitheliumOvaryTeethPlacentaInterstitium\t |
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| 68485. |
State a way to prevent the accumulation of harmful chemicals in our bodies |
| Answer» 1. We can avoid toxic chemical pesticides2. We can eat organic foods when possible . we should always wash fruits and vegetable before eating3. We should choose fish wisely , as many contain unsafe levels of toxins | |
| 68486. |
Will there also be practical exams for class 10 from 1 March 2021 |
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Answer» Yes For both 10th and 12th class ?Practicals/internal assessment will commence from 1 March 2021.?Board Examinations will commence from 4 May 2021. ?Datesheet will be issued soon. No only for 12th Yes |
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| 68487. |
The movement of a snail on the ground is a dash motion |
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Answer» Is this topic of 10th syllabus Rectilinear locomotion\xa0or\xa0rectilinear progression\xa0is a mode of\xa0locomotion\xa0most often associated with\xa0snakes. May be locomotion |
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| 68488. |
Topic of portfolio on acid vs teeth |
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Answer» If the ph value of teeth is below 5.5 then tooth decay will take place. Tooth enamel is the hardest substance in our body it is made up of calcium hydroxypatite . So when we eat food the bacteria produce excess amount of acid by the degradation of sugar and food that is remaining in the mouth . It causes pain and irritation. So to avoid this we need to use basic toothpaste after eating food to prevent tooth decay. The ph value of teeth is below pH 5.5 then the tooth enamel will be corrodedThe enamel made up with calcium hydroxyapatite |
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| 68489. |
Plz give me reduced syllabus of science practical |
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Answer» So hello it is also available on Google so you can go there and search you syllabus was available ok It on google check on google |
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| 68490. |
Explain the absorption of water by the rods and it\'s transport in upward direction |
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Answer» This theory was given by Atkins (1916) and Preistley (1923). According to this theory, the root cells behave as an ideal osmotic pressure system through which water moves up from the soil solution to the root\xa0xylem\xa0along an increasing gradient of D.P.D. (suction pressure, which is the real force for water absorption). If the solute concentration is high and water potential is low in the root cells, water can enter from soil to root cells through\xa0endosmosis. Mineral nutrients are absorbed actively by the root cells due to utilisation of\xa0adenosine triphosphate\xa0(ATP). As a result, the concentration of ions (osmotica) in the xylem vessels is more in comparison to the soil water. A concentration gradient is established between the root and the soil water. Hence, the solute potential of xylem water is more in comparison to that of soil and correspondingly water potential is low than the soil water. If stated, water potential is comparatively positive in the soil water. This gradient of water potential causes endosmosis. The endosmosis of water continues until the water potential both in the root and soil becomes equal. It is the absorption of minerals that utilise metabolic energy, but not water absorption. Hence, the absorption of water is indirectly an active process in a plant\'s life. Active transport is in an opposite direction to that of diffusion.*hope it is help for you * Active absorption refers to the absorption of water by roots with the help of\xa0adenosine triphosphate, generated by the root\xa0respiration: as the root cells actively take part in the process, it is called\xa0active absorption. According to Jenner, active absorption takes place in low transpiring and well-watered plants, and 4% of total water absorption is carried out in this process. The active absorption is carried out by two theories; active osmotic water absorption and Active non-osmotic water absorption. In this process, energy is not required. Active absorption is important for the plants. |
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| 68491. |
Carbon form which type of bonding and why |
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Answer» Carbon also formed covalent bond because carbon has 4 electron on outermost call so the four electrons gain /lose for stable this is not possible to gain or lose electrons so it is also formed covalent bondThank you Idiot Carbon form covalent bond because for completing its octet either it has to lose four electrons Or gain four electrons but both are not possible; so, carbon has share its electrons and making bonds by sharing of electrons is nothing but covalent bonding. Carbon form covalent bond due to its tetravalency (4 valence electrons) |
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| 68492. |
How do carbohydrates, proteins and fats get digested in human beings? Class 10 |
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Answer» The carbohydrates, proteins and fats are digested in small intestine .The enzymes present in the small intestine convert carbohydrates into glucose , fats into fatty acid and glycerol and proteins into amino acidHope this will help ? you.. Digestion in human beings starts from mouth. In mouth, saliva is mixed with food. Salivary amylase or ptylin breaks starch (complex carbohydrates) into maltose and isomaltose and its further digestion is carried out by enzymes present in intestinal juice and pancreatic juice. Pesin breaks peptide bond of protein. Tripsin and peptidase further breaks protein into amino acid. Pancreatic lipase convertes fats into fatty acid and glycerol Carbohydrates, proteins, and fats are digested in the intestine, where they are broken down into their basic units: Carbohydrates into sugars. Proteins into amino acids. Fats into fatty acids and glycerol. |
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| 68493. |
What is fertilization explain tha types of fertilization |
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Answer» Fertilisation is a process in which a male cell ( sperm) and a female cell ( ova) fuses to form zygote... Its of mainly 2 types : internal fertilisation in which the fertilisation takes place inside the female body and external fertlization in which the fertlization takes place outside the female body Fertilization is the process in which to different cell ,(one of male called sperm or male gamete, and one of female called ova or female gamete ). Gatting fuse .It is either be in inside or outside the mother body.It is of two types- 1. Internal fertililizaton 2. External fertilization Fertilisation is the fusion of male and female gamates either inside or outside female\'s body. There is two type of fertilisation:- 1) Internal fertilisation: when fertilisation occurs inside female\'s body it is called internal fertilisation. Eg, humans, birds etc. 2) External Fertilisation: When fertilisation occurs outside female\'s body it is called External fertilisation. Eg, frog |
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| 68494. |
Define the structure of male gamate or sperm with figure |
| Answer» Sperm mainly has 2 parts, Head with nucleus and cytoplasm And a tail which helps it to swim in semen and reach to egg. We can\'t insert pictures here so sorry for diagram | |
| 68495. |
Define the germination of seeds with figure |
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Answer» ? Good Germination is a process by which an organism rises from seed or similar structure. In suitable contions tiny outlet comes out from plumule called seedling. |
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| 68496. |
Define the formation of fruits and seeds |
| Answer» Pollen grains fall on stigma of flowers and it forms pollen tube which runs along with style after chemotropism. Nucleus of pollen grain divides itself into 2 haploid male gamate. One fuses with the egg cell and forms diploid cell and it develops into seed. Other gamate fuses with diploid polar nuclei and forms triploid cell which serves as food for zygote or seed. Ovary develops into fruit and gives protection and food. | |
| 68497. |
What is ampere swimming rule? |
| Answer» Ampere\'s swimming rule states that if a man swims along the current-carrying wire, suc that his face is always towards the magnetic needle through which the current is entering his feet and leaving from his head, then the north pole of the magnetic needle is always deflected towards his left hand. | |
| 68498. |
Define vaccum |
| Answer» Vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal). | |
| 68499. |
Write one observation when Magnesium ribbon is burnt in air |
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Answer» 2Mg + O2 = 2MgO He is asking for observation. When mg ribbon burns in air White dazzling flame come out of it and a white powdery substance will be formed. When the magnesium ribbon is burnt in air it forms a white powder called magnesium oxide. It is obtained by the reaction of oxygen and magnesium. 2Mg + O2 = 2MgO Magnesium ribbon is burnt in air which is oxygen with a white dazzling flame... Then after occurring with oxygen it convert into magnesium oxide which is a white powdery substance....Mg2 + O2 = 2MgO When magnesium ribbon is burnt in air, it combines with oxygen to form white powder magnesium oxide MgO with the release of heat and light.\xa0It\xa0forms\xa0a white powder of the\xa0magnesium oxide.\xa0Magnesium\xa0gives up two electrons to oxygen atoms to\xa0form\xa0this powdery product.2Mg+O2\u200b⟶2MgO |
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| 68500. |
If a conducting wire acts like a magnet, what does it attract?? |
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Answer» It become a electromagnet. It will attract iron,nickel,cobalt or iron like substance as it act as magnet. ? It will attract ferromagnetic substances like iron, cobalt, nickel. Soft iron can easily be magnetised and demagnetised. Soft iron is widely used for making electromagnets. Soft iron:iron that has a low carbon content and is easily magnetized and demagnetized, used to make the cores of solenoids and other electrical equipment. Is it only soft iron?? Conducting wire do act like magnet. They are electromagnet. It attracts soft iron |
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