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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.
| 1001. |
Notes for the chapter :OUR ENVIRONMENT |
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Answer» Bhai ncert hi kaafi h CBSE Class 10 Science Revision Notes Chapter 15 Our\xa0Environment\tEnvironment means everything which surrounds us. It may include living (biotic) and non-living (abiotic) components.\tBiotic : Plants and animals. Abiotic : Air, water etc.\tEnvironment affect the life and development of an organism in its natural habitat & vice a versa.\tSubstances that can be decomposed by the action of micro-organism like bacteria are called bio-degredable. E.g. organic wastes.\tSubstances which cannot be decomposed by the action of microorganisms are called non-biodegradable.\tExample of biodegradable wastes : cattle dung, cotton, jute, paper, fruit and vegetable peels, leaves etc.\tExamples of non-biodegradable wastes : plastics, polythene bags, synthetic fibres, metals, radioactive wastes.For more click on the given link:https://mycbseguide.com/blog/our-environment-class-10-notes/ |
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| 1002. |
What do you mean by blob on a stick in spore formation |
| Answer» Hyphae are thread like structure. tiny blob on a stick structure are sporangium and it contains spores.when this structure come in contact with other moist surface the begin to grow | |
| 1003. |
Write a short note on lymphatic system |
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Answer» 1) Lymphatic system consists of lymph capillaries, lymph vessels, lymph nodes and lymph glands.2) To supply nutrients to the cells (tissues), the liquid portion of the blood with nutri¬ents flows out of the capillaries. This is called tissue fluid.3) To transport the tissue fluid into the main blood stream, a separate system called lymphatic system is present.4) Lymph is the vital link between blood and tissues by which essential substances pass from blood to cells and excretory products from cells to blood.5) Lymph is the substance that contains blood without solid particles.6) Tissue fluid is the substance which contains lymph present in the tissues.7) From intercellular spaces, lymph goes into lymphatic capillaries.8) Lymphatic capillaries join to form large lymph vessels which finally open into larger veins.9) Lymph flows only in direction, that is from tissues to heart through veins.Functions of Lymph:a) Lymph carries digested and absorbed fats from small intestine to different tissuesof the body. .b) It helps in removing Waste materials from the cells in the body to drain into blood.c) Lymph protects cells in the tissues from infection. Its your hommework so do it yourself??? |
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| 1004. |
Explain different components of blood. |
| Answer» Blood\xa0is a connective tissue that helps in the transportation of substances, protects against diseases and regulates the temperature of the body. Do you know why the colour of blood is red?It is red in colour due to a red pigment called\xa0haemoglobin\xa0present in its red cells. The components of Blood are\xa0Plasma, Red blood corpuscles (Red blood cells or RBCs), White blood corpuscles (White blood cells or WBCs) and platelets. | |
| 1005. |
Why blood is called fluid tissue? |
| Answer» The cells of connective tissue are embedded in the homogeneous, intercellular substance called matrix of the tissue. In case of blood, the matrix is liquid or fluid in nature, called plasma. Due to the fluid matrix, blood is a fluid. The blood cells are present in the plasma. | |
| 1006. |
B=munod 0 nI/2r ques on this formulas |
| Answer» | |
| 1007. |
Ozone depletion |
| Answer» Due to the higher pollution there\'s forming wholes in ozone layer or the damging of ozone layer is known as ozone layer depletion. | |
| 1008. |
Last ten year question paper of science with solution |
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Answer» Ncert is enough bro Padhle.inGo and check there. |
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| 1009. |
Formulas of light reflection and refraction |
| Answer» Reflection of light1.m=height of image /height of object2.1/f=1/v-1/u3. m=-v/u4.f=R/2Rarefraction of light1.m= v/u2. 2f=r3.1/f=1/v+1/u4.m=height of image/height of object5.P=1/f 6.If we have to find combination powet of (lenses) -:P=power of 1st lens +powet of 2nd lens+power of............... | |
| 1010. |
Define electric power and it\'s si unit |
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Answer» The rate at which electric current is delivered in a electric circuit is called electric power.it\'s si unit is watt. Rate per unit time At which energy is transferred by an electric circuit. SI unit of power is watt, j/sec. Electric power is the rate at which electric energy is transferred by an electric circuit.\xa0The SI unit of power is the watt, one joule per second. Electric power\xa0is the rate, per\xa0unit\xa0time, at which\xa0electrical\xa0energy is transferred by an\xa0electric\xa0circuit. The\xa0SI unit\xa0of\xa0power\xa0is the watt, one joule per second. |
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| 1011. |
What is avirtual image |
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Answer» The image formed when the light rays don\'t actually meet but appears to meet is known as virtual image. The virtual s cannot be captured on screen The\xa0image\xa0formed when rays of light appear to meet (when diverging rays are extended) at a point is called a\xa0virtual image. Is formed on the different side as that of the object. It is formed on the same side of the object. Real\xa0images\xa0are inverted.\xa0Virtual images\xa0are erect. |
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| 1012. |
How will you arrange 2 ohm ,4 ohm and 12 ohm to obtain 6 ohm |
| Answer» Subtract the 12 ohm to 6ohm | |
| 1013. |
Why the aquarium have to be cleaned once in a while? |
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Answer» In order to clean the water , as the dirtiness cause due to fish excretion and other dust so that it is easy for fishes to survive in aquarium ?? To clean the dead fish or else decomposers would feed on it and consume all the dissolved oxygen, making it difficult for other fish to survive To protect from iron Inorder to remove the deoxygenated water |
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| 1014. |
What is a condom? Reproduction class 10 |
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Answer» It protect from STD and also avoid of mixing male and female gametes. Condom is a sexual protection product which help to not mixed with female ovam |
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| 1015. |
Anyone can u explain the functions of nephron. |
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Answer» Functioning of a Nephron:The blood enters the kidney through the renal artery, which branches into many capillaries associated with glomerulus.The water and solute are transferred to the nephron at Bowman’s capsule.In the proximal tubule, some substances such as amino acids, glucose, and salts are selectively reabsorbed and unwanted molecules are added in the urine.The filtrate then moves down into the loop of Henle, where more water is absorbed.From here, the filtrate moves upwards into the distal tubule and finally to the collecting duct. Collecting duct collects urine from many nephrons.The urine formed in each kidney enters a long tube called ureter. From ureter, it gets transported to the urinary bladder and then into the urethra. Functioning of a Nephron:\tThe blood enters the kidney through the renal artery, which branches into many capillaries associated with glomerulus.\tThe water and solute are transferred to the nephron at Bowman’s capsule.\tIn the proximal tubule, some substances such as amino acids, glucose, and salts are selectively reabsorbed and unwanted molecules are added in the urine.\tThe filtrate then moves down into the loop of Henle, where more water is absorbed.\tFrom here, the filtrate moves upwards into the distal tubule and finally to the collecting duct. Collecting duct collects urine from many nephrons.\tThe urine formed in each kidney enters a long tube called ureter. From ureter, it gets transported to the urinary bladder and then into the urethra. Nephron is unit of our excretory system which 1)filter blood 2)maintain water balance etc.. to filter the blood |
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| 1016. |
What is bond and it\'s types |
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Answer» Bones are those forces which hold the atom together from a compound or molecule types of the bond are as follows:Ionic bond single bond triple bond and double bond the single and triple and double bond are coming in the covalent bond in this strongest bond is the single one from the covalent bond but very strongest bond is ionic bond then the single bond. Bonds are those forces which holds atoms together to form compounds /molecules... It\'s types: ionic bounds and covalent bonds..... HOPE IT WAS HELPFUL FOR YOU BUDDY! !!!!! Bond means joint of any carbon or atom. Bond are two types. 1.saturated bond. 2.unsaturated bond. Bond means joint |
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| 1017. |
How can I concentrate on studies for class 10 |
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Answer» Just make a timetable in which you should add all work you in a day and follow psychology formula of 21 day then it will become your habit and you will automatically be concentrated.... By studying?✏ well and regularly. |
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| 1018. |
How many electrons pass through a conductor in 0.2s if the current passing through it is 0.5A? |
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Answer» A n s w e r :Charge = current * timecharge = 0.5*0.2charge = 0.1 coulumbwe have q = n e0.1 = n ( 1.602*10^-19 )n = 0.1 / 1.602*10^-19By dividing it we get the followingn = 0.0624*10^19n =6.24*10^17 I=0.5At=0.2sQ=t×I=0.2×0.5=0.10sQ=n×en=q/e=0.1/1.6×10-¹⁹ =6.25×10¹⁷ |
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| 1019. |
Fibrinogen helps in clotting of blood or prevent clotting of blood? |
| Answer» Fibrinogen\xa0is a protein, specifically a clotting factor (factor I), that is essential for proper blood clot formation.When\xa0blood clotting\xa0is activated,\xa0fibrinogen\xa0circulating in the\xa0blood\xa0is converted to fibrin, which in turn\xa0helps\xa0to form a stable\xa0blood clot\xa0at the site of vascular disruption.\xa0Coagulation\xa0inhibitor proteins\xa0help\xa0to\xa0prevent\xa0abnormal\xa0coagulation\xa0(hypercoagulability) and to resolve\xa0clots\xa0after they are formed. | |
| 1020. |
Define offspring |
| Answer» \xa0Offspring are the young ones of living organisms, produced either by a single organism in case of asexual reproduction or by\xa0two organisms\xa0in the case of sexual reproduction. | |
| 1021. |
By which the litmus paper is made and define litmus paper |
| Answer» Litmus paper is made by lichens.It is a paper which is used for identify substance an acid or alkali. | |
| 1022. |
Function of petals and sepals?? |
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Answer» ?the coloured part is petals use to attract pollinators for pollinationAnd the lower small leaves is known as sepals used to protect the flowers from the cold and pests Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators.The sepals are the lower, or outermost, part of the flower. They fold over the tender, closed bud and protect it from cold and other injuries while it is developing. Usually sepals are green. In many flowers, however, they are as colorful as the petals and increase the flower\'s attractiveness to insects. |
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| 1023. |
How did Mendeleev use the modern periodic table of elements ? |
| Answer» Dmitri Ivanovich Mendeleev, a Russian scientist arranged the elements in increasing order of their relative atomic masses. He was honoured with Noble prize in 1906 for his Periodic Table.Mendeleev’s Periodic Law states that the\xa0properties of elements are the periodic function of their relative atomic masses.Mendeleev arranged all 63 elements; which were discovered till his time; in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev’s Periodic Table. He divided the table in eight columns and seven rows. The columns are known as groups and rows are known as periods.\tElements are arranged in the periodic table in the increasing order of their relative atomic masses.\tMendeleev divided his periodic table in eight groups and seven periods.\tGroups from I to VII are meant for normal elements and group VIII is for transition elements.\tGroups from I to VII have been divided in two sub groups, while group VIII is meant for three elements.\tPeriods from 4th to 7th have been divided in two series: 1st series and 2nd series.\tElements having similar properties have been kept in the same group. For example; lithium, potassium, rubidium, etc. are in 1st group. | |
| 1024. |
Matel and non-metal |
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Answer» I don\'t know ....Sorry? Comparison Of Physical Properties Of Metals And Non-metals\t |
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| 1025. |
What is balanced equations write its reactions |
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Answer» A chemical equation having an equal number of atoms on both sides is called balanced chemical equationExample - C + O2 --‐---‐> Co2 EG.; H2O----->H2 + O2(UNBALANCED) 2H2O---->2H2 +O2(BALANCED) HOPE THIS HELPS YOU.............. AN EQUATION IN WHICH THERE ARE EQUAL NO. OF ATOMS ON BOTH THE SIDES(i.e ATOMS OF PRODUCTS IS EQUAL TO THAT OF REACTANTS) |
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| 1026. |
WHAT IS CALCINATON? Can anyone explain me this with the most simplest explaination...... |
| Answer» \xa0Calcination -\xa0It is the process of converting an ore into its oxide by heating strongly, below its melting point either in a limited supply or in absence of air. This method is commonly used for converting carbonates and hydroxides to their respective oxides. During calcination, moisture and volatile impurities are also removed.For example: Calcium carbonate is converted into calcium oxide by calcination. | |
| 1027. |
Which indicator is used to find out the strength of an acid or base. How ? |
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Answer» Universal indicators Example: pH scale Universal indicator is used is used to find the strength of an acid or base by changing its colour (pH scale can be used to determine whether a substance is acidic or basic and if it is basic or acidic then how strong it is). In other words we can say it helps us to determine the colour of h+(aq)ions at differnt pH An indicator is a chemical substance that undergoes a colour change at the endpoint. The endpoint of an acid-base titration can be determined using acid-base indicators. Acid Base indicators are either weak organic acids or weak organic bases. The colour change of an indicator depends on the pH of the medium. The un-ionized form of an indicator has one colour, but its ionized form has a different colour.Phenolphthalein\xa0is used to find the strength of caustic soda solution with the help of oxalic acid |
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| 1028. |
When the milk changes into curd (yoghurt) pH value increases or decreases? why? |
| Answer» When it changes to curd its pH will decrease. It is because curd contains lactic acid. Since acids generally have a low pH value, when fresh milk changes to curd its pH will decrease. | |
| 1029. |
What range of fuse should be connected in circuit of current 4A? 10A? and 16A? |
| Answer» Nahi pata | |
| 1030. |
Explain the role of water in the ionization of acids and bases |
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Answer» Ionization of a compound refers to a process in which a neutral molecule splits into charged ions when exposed in a solution.According to Arrhenius theory, acids are the compounds that dissociate in an aqueous medium to generate hydrogen ions,\xa0H+\xa0(aq). On the other hand, bases are the compounds which furnish hydroxyl ions,\xa0OH−(aq) in an aqueous medium. when acids and bases react in neutralization reaction , salt and water is formedAcid + Base ==> Salt + Water |
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| 1031. |
Explain redox reaction |
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Answer» A reaction in which one reactant undergoes oxidation whereas the other gets reduced during the course of reaction are termed as oxidation-reduction reactions or redox reactions. Oxidation refers to the loss of electrons or increase in oxidation state by a molecule, atom, or ion. Reduction refers to the gain of electrons or decrease in oxidation state by a molecule, atom, or ion.Consider the following redox reaction.\tBurning sugars, such as glucose (C6H12O6) and the fatty acids in the fats we eat.\tC6H12O6(aq) + 6 O2(g) --> 6 CO2(g) + 6 H2O(l)\t The reaction in which oxidation and reduction take place simultaneously is called redox reaction When the both rxn that are oxidation and reduction takes place simultaneously that rxn is called redox reaction |
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| 1032. |
How can we increase the concentration of h+(aq) ions in a solution? |
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Answer» The pH of the solution is indirectly proportional to the concentration of H+ ions. Hence with an increase in the concentration of H+(aq) in a solution, the pH of the solution will decrease. By adding acid in it |
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| 1033. |
Which book ( science and maths) is the best to score full marks ? |
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Answer» Lakhmir Singh and Manjit Kaur is best book to score full marks in science .R.D Sharma is best book to score full marks in maths.Oswaal and reliable question bank is also good for achieving good marks in both maths and science for science its best to refer to "lakhmir singh and Manjit kaur" If you clear all concept then you choice science If you know methods and definitions, then maths. |
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| 1034. |
How are oxygen and carbon dioxide transported in human being ? |
| Answer» Haemoglobin in red blood cells have large affinity for oxygen. It temporarily, combines with oxygen to form oxyhaemoglobin and thus, oxygen is carried from the lungs to various body parts. CO2 is highly soluble in water, so it is mostly transported in dissolved form in our blood plasma. | |
| 1035. |
State one reason to justify the position of man at the apex of most food chains? |
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Answer» Now The position of the man is at the apex of most of the food chain because in a food chain The Apex position is mostly taken by carnivorous animals and in a normal food chain herbivores are the producers some small organisms are the second consumers and some much larger animals are the third consumers but we comes at the last. |
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| 1036. |
Who conducte the highest electricity |
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Answer» Conductors,as they allow the electrones to pass through them and highest conducting metal is silver and after that copper Conductors As they have very low resistance as well as high melting points. So as to conduct high electricity without getting burnt. |
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| 1037. |
What is combination reaction ? Explain with example. |
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Answer» The type of reaction in which two or more reactants are combine to form single product is called combination reaction A combination reaction is a general category of chemical reactions. It may be defined as a chemical reaction in which two or more substances combine to form a single substance under suitable conditions.Combination reactions are also known as synthesis, because in these reactions new substances are synthesized.2 Na(s) + Cl2 (g) → 2NaCl(g) When two or more elements combine to form one product then the reaction is called combination reaction. |
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| 1038. |
What is right and left hand thumb rule in magnetic field |
| Answer» Whenever a current carrying conductor comes under a magnetic field, there will be a force acting on the conductor. The direction of this force can be found using Fleming’s Left Hand Rule (also known as ‘Flemings left-hand rule for motors’).Similarly if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor. The direction of this force can be found using Fleming’s Right Hand Rule.In both Fleming’s left and right hand rules, there is a relation between the magnetic field, the current and force. This relation is directionally determined by Fleming’s Left Handrule and Fleming’s Right Hand rulerespectively.These rules do not determine the magnitude but instead show the direction of any of the three parameters (magnetic field, current, force) when the direction of the other two parameters is known.Fleming’s Left-Hand rule is mainly applicable to electric motors and Fleming’s Right-Hand rule is mainly applicable to electric | |
| 1039. |
Loss of diversity may lead to the loss ecological stability. Explain how.( plz Explain in short) |
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Answer» Thanks sanika?? You may explain the statement by explaining the food chain.....If one trophic level organism is removed, the next levels will also get affected......No energy flow so no ecological balance |
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| 1040. |
How salts are classified base on pH value ? |
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Answer» Salts are classified as acidic salt or basic salt or neutral salt. Acidic salts have the pH lower than 7. They are formed by reaction between strong acid and weak base. Basic Salts have pH higher than 7. They are formed by reaction between weak acid and strong base. Neutral salts have pH of 7. They are formed by the reaction between strong acid and strong base. Salts are classified as acidic salt or basic salt or neutral salt.Acidic salts have the pH lower than 7. They are formed by reaction between strong acid and weak base.Basic Salts have pH higher than 7. They are formed by reaction between weak acid and strong base.Neutral salts have pH of 7. They are formed by the reaction between strong acid and strong base. |
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| 1041. |
What is the function of the digestive enzymes? |
| Answer» Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. helps to break the complex food particles into simple ones so that these simple particles can be easily absorbed by the blood and thus transported to all the cells of the body. | |
| 1042. |
Why lungs of alveoli is covered with blood capillaries ? |
| Answer» Alveoli present in the lungs are covered with blood capillaries so that the exchange of gases can take place between the membranes of the alveoli and the surrounding capillaries. The\xa0blood capillaries covering alveoli have a low oxygen and high carbon dioxide concentrations. This allows oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood. | |
| 1043. |
What is holozoic nutrition ? |
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Answer» Holozoic nutrition means nutrition as we can see in humans i.e. the nutrition which are having the processes ingestion, digestion, absorption, assimilation and egestion Holozoic Nutrition:\xa0In holozoic nutrition, the digestion of food follows after the ingestion of food. Thus, digestion takes place inside the body of the organism. Holozoic nutrition happens in five steps, viz. ingestion, digestion, absorption, assimilation and egestion. |
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| 1044. |
Show how water is necessary for plants ?? |
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Answer» Water is very necessary for photosynthesis. An experiment to show water is necessary for photosynthesis is given below:Every plants need water for photosynthesis to make their food(glucose ). Plants absorb water through their roots. Then from roots, by their special part called xylem, water is taken up to their leaves where photosynthesis occur. Then from leaves food is distributed to different parts of the plant. So like that if plants do get water then there could be no more food produce and if there would be no more food produce then it means that there would be no more process called photosynthesis. So water is very important for photosynthesis. (i) Water is used to transport the metabolic products from one part to the other where they are needed. So it acts as a vehicle for the transportation.(ii) water is an electron source of photosynthesis.In this process six water molecules combine with six carbon molecules to form, oxygen and glucose.(iii) Water is evaporated through the stomata present on the leaves. It cools the plant in the hot sunny days.(iv) Water is necessary to maintain turgidity i.e. the pressure of water in the cells of plants which is important for the survival of plant else it will wilt. It is also required for the growth as it expands the plant cells.(v) Water regulates the opening and closing of stomata, which in turn regulates transpiration and photosynthesis. |
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| 1045. |
Show how chlorophyll is necessary for plants ?? |
| Answer» Requirements : A potted plant with variegated leaves - for example, Croton or money plant (variegated leaves are partly green and partly white), rice paper, pencil, white paper sheath, beaker, test tube, 70% alcohol, KL solution, water bath.Method : Keep the potted plant with variegated leaves in dark for three days so that the leaves become free from starch. Then place the plant in bright sun light for about 6 hours. Take a variegated leaf of the potted plant kept in bright sunlight. Trace the outline of leaves and its variegated parts on the tracing paper (the variegated leaves show pale yellow spots in green leaves. These areas indicate the absence of chlorophyll). Dip the leaf in boiling water for a few minute. Now boil the leaf in 70% alcohol till it decolorizes. Now dip the leaf in boiled water to make the leaf soft. Take out the leaf and stain with iodine (KL) solution. Observe the change in colour.Observation : The blue colour appears only in those parts of leaf which were green in colour. The blue colour will not appear in variegated parts. This shows that starch formation takes place only in green (chlorophyll containing) parts of the leaf. Thus, the chlorophyll is essential for photosynthesis. | |
| 1046. |
Show how sunlight is necessary for plants ?? |
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Answer» Sun is necessary for plant because sun gives light from which plants make their food . To prove the necessity of sunlight in photosynthesis following steps need to do\tTake a plant with destarched leaf.\tLeaf is partially covered with black paper on which a design is cut.\tExpose this plant to sunlight for few hours and perform a starch test with iodine solution.Observation-\tCovered leaf part shows brown colouration.\tExposed leaf shows blue-black colour.Result-\xa0Starch is present in the exposed leaf.Conclusion-\xa0Leaf exposed to sunlight give iodine test, proving that sunlight is necessary for photosynthesis. |
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| 1047. |
Why is variation beneficial to the species but not necessary for the individual ? |
| Answer» \xa0Variations are\xa0beneficial for the survival of the species.\xa0Populations of organisms fill well-defined places, or niches, in the ecosystem, using their ability to reproduce. However, niches can change because of reasons beyond the control of the organisms and could even wipe out the entire population.\xa0However, if some variations were to be present in a few individuals in these populations, there would be some chance for them to survive.For example - If there were a population of bacteria living in temperate waters and suppose the water temperature were to be increased by global warming. Most of these bacteria would die, but the few heat resistant variants\xa0would survive and grow further. Variation is thus useful for the survival of species over time.\xa0 | |
| 1048. |
Explain the biological magnification with examples? |
| Answer» Biological magnification refers to the process where toxic substances move up the food chain and become more concentrated at each level...An example of biological magnification and its danger is anu small fish that eats plankton that has been tained with mercury | |
| 1049. |
Name the harmones involved in regulation of spermatogenesis |
| Answer» Gonadotropins FSH and LH are secreted by the anterior pituitary. FSH promotes spermatogenesis in the seminiferous tubules and LH promotes androgen production in the interstitial cells (androgens are required for attainment of reproductive maturity in males). | |
| 1050. |
What is double decomposition reaction? |
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Answer» The type of reaction in which mutual exchange of ions takes place is called double displacement reaction The type of reaction in which mutual exchange of ions take place is called double displacement reaction A double decomposition reaction is a type of decomposition reaction in which two constituent reactants interchange positive and negative ions and form two new compounds.ExampleHCl(aq) + NaOH(aq) → NaCl(aq) + HOH(l) This is a wrong ans Double decomposition reaction is that reaction in which a compound decomposes into two another compound on heating, electricity or by sunlight.Thanks & RegardsRounakMay it help you |
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