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.
| 45501. |
First question Write various type of contraceptive method |
|
Answer» The different methods of contraception are:(i) Barrier method: In this method physical devices like condom, cervical caps and diaphragm are used to prevent sperms to reach up to the ovum.(ii) Chemical method: In this method specific drugs are used by females like oral pills. Oral pills mainly contain hormones and are called oral contraceptives.(iii) Intrauterine Contraceptive Devices (IUCDs): IUCD like Copper-T is placed safely in the uterus by a skilled doctor. IUCDs prevent implantation of the fertilized ovum inside the uterus.(iv) Surgical method: This method is applicable to both male and female. In males, a small portion of vas deferens and the fallopian tube in female is surgically removed or ligated (tied). It is known as vasectomy in males which prevents release of sperms from the testes. In females, it is called tubectomy. Barrier method, chemical method, surgical method Barrier method. Chemical method. Intra- uterine device. Surgical method |
|
| 45502. |
Function of hormone and its related glands |
||||
| Answer» | ndocrine gland | Location | Hormones Produced | Functions | \tPituitary gland (Also known as the master gland)At the base of brainGrowth hormone (GH), thyroid stimulating hormone (TSH), Follicle stimulating hormone (FSH)GH stimulates growth, TSH stimulates functioning of thyroid gland, FSH stimulates the follicles during ovulation.Thyroid GlandNeckThyroxineControls general metabolism and growth in the body.Adrenal glandAbove kidneysAdrenalinPrepares the body for emergency situations and hence is also called ‘Fight and flight’ hormone.PancreasNear stomachInsulinControls blood sugar levelTestis (male)In *******TestosteroneSperm production, development of secondary sexual characters during puberty.Ovary (female)Near uterusOestrogenEgg production, development of secondary sexual characters during puberty.\t|
|---|---|---|---|---|---|
| 45503. |
Uses of plaster Paris and its reaction |
|
Answer» Plaster of Paris is prepared by heating gypsum to 120–130°C.2CaSO42H2O {tex}\\;\\xrightarrow[{120-130^oC}]{Heat}{/tex}(CaSO4)2H2O + 3H2O(g)Uses of plaster of Paris:(i) It is used in making chalks and fire proof materials.(ii) Used for making patient plasters used in surgery and for plastering fractured parts of the body.(iii) Mixed with alum, it is used as a cement in ornamental casting and for making moulds in pottery work. When we heat gypsum (CaSO4.2H2O)at 373 kelvi n, to form pop (CaSO4.HalfH2O) Used for joining fracture bones in hospitals and also used for making decorative pieces for houses etc. |
|
| 45504. |
What happens when copper oxide reacts with HCL |
|
Answer» CuO + 2HCL ➡➡ CuCl2 + H2O When copper oxide reacts with HCl it forms copper copper chloride along with water |
|
| 45505. |
What happens when copper reacts with HCl??? |
|
Answer» Copper doesn\'t react with HCl When copper reacts with HCL , it forms copper chloride and Hydrogen gas . |
|
| 45506. |
What do you mean by Esterfication |
|
Answer» Easterification is a process in which ethanol reacts with ethanoic acid ( acetic acid ) at 443k and sulphuric acid act as catalyst to form easter (sweet fruit smelling) which is further used for making perfumes... It is formed by reaction of an acid and alchoholEg. Ethanoic acid reacts with absolute ethanolC2H5OH+CH3COOH---->CH3COOC2H5+ The process in which an alcohol reacts with a carboxylic acid to form a sweet smelling ester is called esterification reaction. The reaction of ethanol with ethanoic acid in presence of sulphuric acid to form Ester is known as esterification |
|
| 45507. |
Differentiate between oxidation and reduction reaction. |
|
Answer» Thanks everyone ☺️☺️ \tOXIDATIONREDUCTIONLosing electronsGaining electronsIncrease in oxidation numberDecrease in oxidation numberFor a given compound losing hydrogenFor a given compound gaining hydrogenThis reaction releases energyThis reaction stores energyoxidizing agents: Ozone, Bleach, peroxideCommon reducing agent is metal\t The addition of oxygen is known as oxidation and the reduction of oxygen is known reduction reaction . Oxidation is removing hydrogen and adding oxygen reduction viseversa |
|
| 45508. |
What is molecular phylogeny?? |
| Answer» It is a branch to Study evolutionary relationships by analyzing molecular differences in their DNA sequences. | |
| 45509. |
What is double circulation? Example |
|
Answer» When the same comes twice in the heart first from heart to body and then body to heart is called double circulationExample human heart, Double circulation is the process of transfer of blood twice in one cycle of circulation. Example) Human heart |
|
| 45510. |
What is the difference betwen regenration and fragmentation (with example )?? |
|
Answer» \tFragmentationRegeneration1. Fragmentation occurs in multi-cellular organisms with simple body organisation.1. Regeneration occurs in fully differentiated multi-cellular organisms with complex body organization.2. In fragmentation, an organism breaks into pieces and each piece develops into new individual.2. In regeneration organisms if breaks into pieces, each piece may or may not develop into new individual.3. No specialised cells are involved in fragmentation.3. In regeneration, specialised cells proliferate and form a mass of cells. The cells from the mass differentiate to form different cells types and tissues.Example: SpirogyraExample: Regeneration of blood cells in mammals.\t Fragmentation is a process in which the body is cut from a specific part and thus it regenerates.Ex. Spirogyra In regeneration body gets cut accidentally from any part but all the parts generates into a new individual.Ex. Planaria |
|
| 45511. |
What acid is present in ant sting? |
|
Answer» Formic acid..... Methanoic(formic) acid Methanoic acid |
|
| 45512. |
Why does sun appears reddish in the morning? Draw a diagram to explain. |
| Answer» The sun appears reddish early morning because at that time it is located near to the horizon and light has to pass thick layers of air and travel larger distances before reaching us. Thus, the blue rays having shorter wavelength are scattered and the red rays of longer wavelength reaches our eyes giving sun appearance a reddish color. Thus, it can be stated that the color of sun that appears to us depends on the position of sun and the distance its rays have to travel. If the rays have to travel longer distances then the shorter wavelength colors get scattered away and longer wavelength color appears. This phenomenon will not be observed by an observer on the moon because there is no atmosphere on the moon to scatter light. | |
| 45513. |
I want cbse science marking scheme |
| Answer» Yes is there in the cbse site | |
| 45514. |
Please tell me the waitage of all chapter in science? |
| Answer» | |
| 45515. |
Explain metals and non-metals on the basis of their physical properties |
| Answer» Metals can conduct electric current while Non-metals can not, ...Metals contain loosly free electrons in its valence shell while non metal contain tightly bound electrons... | |
| 45516. |
Hi can any one pls explain me genetic drift ? |
|
Answer» creation of new n distinct species dat r reproductively isolated.... HOPE IT HELPS YU The survival advantage provided to a population of species due to an accident is known as genetic drift.. |
|
| 45517. |
Why do more and more people prefer to use condoms |
| Answer» Thw sperm does not reach the egg | |
| 45518. |
Drift velocity |
| Answer» Given in NCERT Chapter electricity in box see there | |
| 45519. |
Draw a diagram of human brain |
| Answer» Given in ncert | |
| 45520. |
mention any two functions of kidney |
|
Answer» •filtration of blood •reabsorption of main nutrients osmoregulation: water n ionic balancefilter blood |
|
| 45521. |
Human being occupy top level of any food chain consequence of this in our body |
| Answer» due to biological magnification toxic substances r much in last trophic level i.e of humans | |
| 45522. |
Advantage of water save Management |
| Answer» By saving water we can save our life. | |
| 45523. |
Define saponification reaction |
|
Answer» Thanks Geetanand yadav aapne to estrification ka reaction bataya h The making if soap by alkalis with fat/oil is called sapnofication CH3COOC2H5----IN THE PRSENCE OF NAOH-----------CH3COONA+C2H5OH |
|
| 45524. |
Calculate the no. of electrons constituting 1 C of chargePls give the proper steps with explanation |
| Answer» Charge on one electron=1.6*10 raised to power-19.If the value of charge is 1.6 *10 raised to power -19,then number of electron=1.If the value of charge is 1 coulomb ,then number of electrons=(1/1.6*10raised to power -19)=(1/1.6)*10raised to power 19.=0.625*10 raised to power 19.=6.25*10raised to power 18 hope it helps you...... | |
| 45525. |
Mendal experiments |
| Answer» Mendal choose pure-bred pea plants because of their clear cut differences .He obtained several generations and calculate their ratio acc. To their characters. | |
| 45526. |
Define sopanification |
|
Answer» Definition -- when the ester gets converted back into alcohol and sodium salt of acid when treated with alkali like sodium hydroxide. This reaction is called saponification.. Reaction is in the other posted answer ..You can see it from there It is a reaction.CH3COOC2H5----------TO GIVE IN THe presence of NaOH------CH3COONa+C2H5OH |
|
| 45527. |
which metal has highest melting point |
|
Answer» Search in Google Its tungsten I think tungsten... Iron |
|
| 45528. |
Which is the most soluble substance ? |
|
Answer» Mostly the solid substance which dissolved in water is sodium chloride ....Tell the state in which the substance must be dissolved....Tell the full question Water...? Gases |
|
| 45529. |
Please send the recent science question paper pleas friends |
|
Answer» Ohk...but I don\'t know how to post a pic here... No i will ask that in your science exam what are the questions are there |
|
| 45530. |
Why stars twinkle where as planet do not |
|
Answer» Light from the stars reaching our eyes increasing and decreases continuously due to atmospheric refraction. This constant increase the star\'s light reaching our eyes makes the star appear to be twinkling. But a planet can be considered collection of large number of point sources of light. So the dimming effect caused by some of the point sources is nullified by the brighter effect of other point sources and hence stars twinkle but planets not.... Stars twinkle due to atmospheric refraction . When light passes through our earth surface the light refracts due to different atmospheric levels.. Hi friend please send your science question Read the poem twinkle twinkle little stars?? |
|
| 45531. |
Science ma kya kya yaad kara |
| Answer» | |
| 45532. |
Hamai body ma bon kitana hota ha |
|
Answer» Wese to 206 bones are there but agar ek -do tut jae to kuch kh nahi skte?? 206 bones in our body 320 bones in our body |
|
| 45533. |
Transport of food in plants require living tissues and energy . Justify the statement , |
| Answer» | |
| 45534. |
Food should be kept in airtight container container give reason |
| Answer» Prevent from rancidity | |
| 45535. |
Differentiate between vas deference and fallopian tube |
|
Answer» Vas deference is present in the male reproductive system which nourishes the sperm cell. Whereas fallopian tube is present in female reproductive system which allows the released egg to pass through the uterus male gamete (sperm) passes through vas deference and the female gemete (egg) pass through fallopian tube |
|
| 45536. |
What r characteristics of covalent bond |
|
Answer» \tThe melting and boiling points of covalent compounds are generally lower than those of ionic compounds.\tCovalent compounds are generally more flexible than ionic compounds. The molecules in covalent compounds are able to move around to some extent and can sometimes slide over each other (as is the case with graphite, which is why the lead in your pencil feels slightly slippery). In ionic compounds, all the ions are tightly held in place.\tCovalent compounds generally are not very soluble in water, for example plastics are covalent compounds and many plastics are water resistant.\tCovalent compounds generally do not conduct electricity when dissolved in water, for example iodine dissolved in pure water does not conduct electricity. They are form b/w non metal onlyEg H20 They have low heating and boiling point They do not conduct electricity They are weak bonds |
|
| 45537. |
How to identify group no. of any element |
|
Answer» are to valence electron se kaise By the no. of valence electrons in its outermost shell. |
|
| 45538. |
Why there is no bile juice in digestive enzyme, is it essential, whats happen is there is no |
| Answer» Bile is a digestive juice secreted by the liver. Although it does not contain any digestive enzymes, it plays an important role in the digestion of fats. Bile juice has bile pigments such as bilirubin and biliverdin. These break down large fat globules into smaller globules so that the pancreatic enzymes can easily act on them. This process is known as emulsification of fats. Bile juice also makes the medium alkaline deu to presense of NaHCO3 and also activate lipase. | |
| 45539. |
Evidences of evolution |
| Answer» \tRelationship between organisms\tAnatomy and morphology\tHomologous OrgansAnalogous OrgansVestigial OrgansAtavism\t\t\tGenetics\tPaleontology (study of fossils)\tEmbryology | |
| 45540. |
What are the different between the ac and dc |
||
| Answer» | Alternating Current | Direct Current | \tAC can carry and safe to transfer longer distance even between two cities, and maintain the electric power.DC cannot travel for very longer distance. If does, it loses electric power.The rotating magnets cause the change in direction of electric flow.The steady magnetism makes the DC to flow in a single direction.The frequency of AC is depended upon the country. But, generally, the frequency is 50Hz or 60Hz.DC has no frequency of zero frequency.In AC the flow of current changes it direction backward periodically.It flows in a single direction steadily.Electrons in AC keep changing its directions – backward and forwardElectrons only move in one direction – that is forward.\t|
|---|---|---|---|
| 45541. |
Which metal is hard as diamond |
|
Answer» Potassium is hard as diamond friends None... diamond is the hardest metal.. Platinum |
|
| 45542. |
Why do inoic compound has high melting point |
|
Answer» Ionic Compounds have high melting point because they have maximum force of attraction between their atoms. In an ionic compound there is large electrostatic force of attraction between opposite charged ions. To overcome these forces a considerable amount of energy is needed therefore ionic compounds have high melting points. |
|
| 45543. |
Ch 9 heridity and evolution me important yTopic btana |
| Answer» *** determination analogous or homologous orgas | |
| 45544. |
Why is calcium sulphate hemihydrate called \'plaster of peris\'. |
| Answer» Plaster of Paris gets its name from large gypsum deposits in Montmartre in Paris. We know that plaster of Paris, which is chemically calcium sulphate hemihydrate is obtained by heating gypsum. So the origin of the name \'Plaster of Paris\' is the fact that the source material gypsum is found in large deposits at Montmartre in Paris. | |
| 45545. |
Describe exchange of gases in humans with diagram |
| Answer» Respiration in human beings takes place through a special system called as respiratory system.This involves nostrils, nasal cavity, larynx, bronchi, bronchioles ending in alveoli inside the lungs. Lungs are designed in such a way that they are lined by a thin membrane to facilitate the exchange of gases.\xa0Bronchi and bronchioles are the parts of respiratory system located in the lungs.*Primary bronchi are the structures which arise by the bifurcation of the wind pipe before entering the lungs. Primary bronchi divide and give rise to secondary bronchi. Bronchioles are the small tubular extensions of repeatedly dividing secondary bronchi inside the lung.*Bronchi end in bronchioles. Each bronchi divides at least 20 times to form smaller bronchioles Bronchioles end in small tubular structures called as alveolar tubes.Bronchi are made up of fibrocartilaginous layer. Bronchi serve as tubes of air conductors. Bronchi are larger in diameter\xa0*Bronchioles branch into many alveolar tubes. Bronchioles are lined by smooth muscles. Bronchioles are air conductors and others are respiratory gas exchangers. Bronchioles are smaller in diameter.*Alveoli are richly supplied by blood vessels which help in exchange of gases on the alveolar membrane. | |
| 45546. |
Kya human brain ka diagram important hai |
|
Answer» No it is not important. Maybe yes.... Because if the question arise from brain and part of brain you should draw the digram for good marks No its not important for board exam |
|
| 45547. |
Explain ray diagrams plzz |
|
Answer» Hope it helps??? Ray diagram is a diagram which shows us the consequences and results of placing an object at diff levels in front of any object used to study the direction of light. |
|
| 45548. |
Which harmone is serected by pituitary gland |
|
Answer» 2)\xa0Pituitary gland :\xa0\xa0Pituitary gland is divided into.(i) Adeno hypophysis (ii) Neuro hypophysis\xa0\xa0Hormones secreted by the adenohypophysis are:(i) Growth hormone (GH)(ii) Prolactin(iii) Thyroid-stimulating hormone (TSH)(iv) Adrenocorticotrophic hormone (ACTH)(v) Luteinizing hormone (LH)(vi) Follicle-stimulating hormone (FSH)(vii) Melanocyte-stimulating hormone (MSH)Hormones secreted by the neurohypophysis are:(i) Oxytocin(ii) Vasopressin Explain ray diagrams. |
|
| 45549. |
Will MCQs be asked in the upcoming boards of class 10????? |
|
Answer» No one word answers will be asked.. Not MCQs but one word question will be asked I dont know |
|
| 45550. |
In a flowering plant summarize the events that take place after fertilization |
|
Answer» Post-fertilisation events: It includes development of endosperm and embryo, and maturation of ovules into seeds and ovaries into fruits.Formation of Endosperm:\tThe endosperm develops before the embryo because the cells of the endosperm provide nutrition to the developing embryo.\tThe primary endosperm nucleus repeatedly divides to give rise to free nuclei. This stage of development is called free nuclear endosperm.\tCell wall formation occurs next, resulting in a cellular endosperm.\tThe endosperm may be either fully consumed by the growing embryo (as in pea and beans) or retained in the mature seed (as in coconut and castor).Development of Embryo: \tThe embryo develops at the micropylar end of the embryo sac where the zygote is situated.\tThe zygote gives rise first to the pro-embryo, and then to the globular, heart-shaped, mature embryo.\tA typical dicot embryo consists of an embryonal axis and two cotyledons.\tThe portion of the embryonal axis above the level of cotyledons is called epicotyl. It contains the plumule (shoot tip). The portion below the axis is called hypocotyl. It contains the radicle (root tip). The root tip is covered by the root cap. After fertilization , ovary develops into seed & ovule into fruit meanwhile the sepals ,petals ,stamen shrivel and fall off. |
|