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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.
| 54001. |
What are the types of reflection . |
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Answer» Rarefaction also concave mirror ,convex mirror Regular reflection and irregular reflection |
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| 54002. |
What is rectilinear propogation of light |
| Answer» Rectilinear Propagation of light: In a homogeneous transparent medium light travels in a straight line. This phenomenon is knows as rectilinear propagation of light. Let us conduct an experiment to demonstrate this Three cardboards A, B and C are taken and a pinhole is made at the center of each cardboard. The candle is placed at one end as shown here. Click on the candle to light it. The cardboards are arranged in such a way that the three pinholes and the candle flame are in a straight line. The candle flame can be viewed through the pinhole of the cardboard C. Now, displace one of the cardboards by clicking on it. The flame will not be visible from the pinhole of the cardboard C. From this, it is clear that line travels in a straight line. | |
| 54003. |
What is chemical changes |
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Answer» In which new substances are formed and cannot reversed by reversing the condition The process in which the rectants react and result in a new product also which can not be regain again A process in which new substances having properties and composition different from the original substance are formed, is called a chemical change. |
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| 54004. |
Why is limewater slitly milky? |
| Answer» | |
| 54005. |
How can we say that chemical reaction has taken place? |
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Answer» 1)Due to change in colour 2)change in smell We can identify that chemical reaction has taken place by observing :1. Change in colour.2. Evolution of gas.3. Change in temperature.4. Formation of precipitate. When a new substance is formed due to reaction of two or more element |
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| 54006. |
what is the name of black salt in science with formula |
| Answer» Commonly used in the Indian kitchens, black salt, also popularly known as kaala namak has known to be a type of Indian volcanic rock salt. Black salt is less processed and is less iodized, which makes it healthier. Black salt is a composition of 4 substances viz. mainly NaCl with impurities of sodium sulphate (Na2SO4) , iron sulphate (FeSO4) and hydrogen sulphide (H2S). | |
| 54007. |
Chemical preperation of sodium hydroxide NaOH |
| Answer» Na+ OH- =NaOH | |
| 54008. |
Chemical Eqation |
| Answer» Equation which consists of reactants and products side and a sign of equality here reactants reacts to form products . It can be of 2 types 1)Balanced chemical equation 2)Unbalanced chemical equation. For ez.H2 +O2=H20 | |
| 54009. |
Food web increases the stability of an ecosystem.Justify it. |
| Answer» Food web increase the stability of an ecosystem because food web includes all interconnected food chains. A single organism may be connected to various food chains at same or different tropic level. Even if one organism becomes extinct by some means, the organism may be able to obtain food from other interlinked organism. Also, food web results in the regular circulation of energy and cycling of nutrients in the ecosystem, that aids in its stability. | |
| 54010. |
Balancing eguation |
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Answer» The chemical equation which follow the law of conservation of mass is known as balanced equation The chemical equation in which the no. of atoms of different elements is same on both sides of the arrow is called balanced chemical equation |
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| 54011. |
A short note on ATP formation |
| Answer» ATP is the energy currency for most cellular processes. The energy released during the process of respiration is used to make an ATP molecule from ADP and inorganic phosphate. | |
| 54012. |
Name four important nutritions present in our food |
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Answer» Calcium, protien , fibre , and fat. Calcium Carbohydrates FatProteins Xalcium |
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| 54013. |
What is the limitation of chemical equation ? |
| Answer» By chemical equation chemical reaction takes place | |
| 54014. |
The reactivity series of elements |
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Answer» First is k,Na,Ca,Mg,Al,Zn, Fe,Sn,Pb,H,Hg,Ag, Au,Pt. Done Reactivity series by symbol |
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| 54015. |
A tortise moves a distance of 100 m in 15 min. What is it\'s average velocity in km/hr ? |
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Answer» I want answer in km/hr 0.16..m/s |
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| 54016. |
What is series combination |
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Answer» All devices r connected in series in a circuit when all the devices in the circit are connected in series then it is called series combination. |
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| 54017. |
Came time be travel possible |
| Answer» ?????? | |
| 54018. |
Gravity |
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Answer» ?? ??? An apple falls down and gravity comes out... ?? ???? |
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| 54019. |
Example for food chain |
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Answer» Grass-deer-human Grass - deer - eagle Grass-deer-eagle |
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| 54020. |
Example for food chaun |
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| 54021. |
Name the cycle in which pyruvic acid is oxidised into Co2 and water in the presence of oxygen? |
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Answer» Aerobic respiration Kreb cycle Respiration |
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| 54022. |
Science ncert bok exercise help in boards exam this year any information about it guys. |
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Answer» Reply guys Thanks you very much Don\'t know |
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| 54023. |
What is the function of organ spleen |
| Answer» The spleen plays multiple supporting roles in the body. It acts as a filter for blood as part of the immune system. Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there. The spleen also helps fight certain kinds of bacteria that cause pneumonia and meningitis. | |
| 54024. |
Difference btween digestion in stomach and pancreas |
| Answer» In pancreas no digestion is donePancreas only secreate pancreatic juice to break down the food in simpler substance | |
| 54025. |
Describe human digestive system ? |
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Answer» See on text book or ncert book of biology of class 10 Prefer to ncert class12\xa0 It starts with mouth and gets end with ****..? |
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| 54026. |
I want some value based questions from the topic our environment of science chapter |
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Answer» cbseguide consists these questions Explain about food webs consisting of food chain in our nature/ environment |
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| 54027. |
What determines the the rate at which energy is delivered by a current |
| Answer» Electric power of the appliance | |
| 54028. |
Are rd sharma books are good |
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Answer» They are the best. You are right khush good Yes It is good book .? ys Yes Yes , they are niceThe content is very broad. |
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| 54029. |
How much time is needed to pass through 1 black hole |
| Answer» 100000000000m/s | |
| 54030. |
What do you mean by fuel |
| Answer» | |
| 54031. |
How does guard cells help in opening and closing of stomata |
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Answer» When water enter guard cell it swells up and causes opening and when water does not flow to it then it shrink and causes closing. Guard cells helps to carry water from stem to leafs |
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| 54032. |
What is the difference between the types of decomposition reaction? |
| Answer» | |
| 54033. |
Mention some situation in daily life where a chemical change occurs |
| Answer» Souring of milkCooking of foodCurd from milk | |
| 54034. |
Which is the nost important organ in our body |
| Answer» All organs are important . All of them have special function | |
| 54035. |
What is a sedimentary rock? |
| Answer» Sedimentary rocks are formed by the deposition and subsequent cementation of that material within bodies of water and at the surface of the earth. The process that causes various organic materials and minerals to settle in a place is termed as sedimentation.The particles that form a sedimentary rock by accumulating are called sediment. Before being deposited, the sediment was formed by weathering and erosion from the source area and then transported to the place of deposition by water, wind, ice, mass movement or glaciers, which are called agents of denudation. Sedimentation may also occur as minerals precipitate from water solution or shells of aquatic creatures settle out of suspension. | |
| 54036. |
In which state does FIRE exists? Solid/liquid/gas |
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Answer» How...any reason? Gas Gas |
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| 54037. |
Define decomposition reaction?? |
| Answer» when a single compound breaks down into two or more simpler elements or compound, this reaction is said to be a decomposition reaction | |
| 54038. |
How are the fats digested in our bodies? Where does this process take place? |
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Answer» Fats is firstly emulsified by bile juice then it goes to pancrease where it breakdown by the pancreatic lipase.Then in small intestine\'s Duodenum where it finally breaks down into fatty acid and glycerol. Fats are digested in small intestine. Bile break down the fats and the process is called emulsification of fats |
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| 54039. |
What is Daniel cell??? |
| Answer» Daniel cell is a type of electrochemical cell discovered in 1836 by John federic Daniel .. | |
| 54040. |
Define any 2 methods of preventing rancidity |
| Answer» Keeping food in nitrogen packs and away from sunlight | |
| 54041. |
What do u mean by potential difference ? |
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Answer» the electron moves if there is electric pressure at the ends of wire this pressure is called as p.e Work done in moving a positive unit charge from one point to another |
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| 54042. |
How is mg has high melting point than na |
| Answer» Due to electro chemical series | |
| 54043. |
How does sperm come out of ***** ? What are the functions of sperm? |
| Answer» A sperm cell is the male reproductive cell and a\xa0mature human sperm cell has snake like structure. A male sperm cell comprises the following parts - head, neck, middle piece and tail.The head carries the genetic information, neck contains enzymes, middle piece supplies energy to the sperm and the tail helps the sperm to swim in the female genital tract.The sperm cell has a long tail like flagella. The tail is made of protein fibres which contract on alternative sides, giving it a wavelike movement (snake-like motion). The main function of the tail; is the propulsion system which means it helps in propelling or swim the sperm cell forward to meet the egg. It is extremely important that the sperm moves forward instead of laterally or in circles.\xa0\xa0 | |
| 54044. |
What is acidic,basic, mixed, double salt? |
| Answer» | |
| 54045. |
Why potentially of earth is zero? |
| Answer» | |
| 54046. |
What is stomatal transpiration ? |
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Answer» Stomatal Transpiration: Transpiration mainly takes place through surface of leaves. Water vapour diffuses out through minute pore (stomata) present in soft aerial part of plant is known as Stomatal Transpiration. Of the total water loosed, near about 85 – 90% of water loosed by the stomatal transpiration. It is loss of excess water , this process is performed by stomata. |
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| 54047. |
Why it is suggested that magnesium ribbon should be cleaned by rubbing Sandpaper before burning |
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Answer» As magnesium kept open get reacted with oxygen , which for a protective outer layer of magnesium oxide which prevents magnesium for further reactions due to which we cleab magnesium witb sand paper. Because it have a layer of oxides over its surface |
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| 54048. |
Why do respiration is known as exothermic reaction |
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Answer» Respiration is an exothermic reaction because in respiration oxidation of glucose takes place which produce large amount of heat energy . As respiration evolve energy or heat after reaction |
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| 54049. |
How do sweet potato reproduce through the roots? |
| Answer» Sweet potato is propagated by the root tubers. The root tubers of these plants are cut into many pieces and covered with mud. Each part of the tuber grows into a new plant. Potato’s tubers which are fleshy are underground storage structures. Buds give rise to aerial shoots under favorable conditions. | |
| 54050. |
What is aerobic and anaerobic respiration |
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Answer» Aerobic respiration - In aerobic respiratory oxygen is required . Anaerobic respiration- In anaerobic resporation oxygen is not required . sorry 2.Anerobic-donot need oxygen There are two types of respiration 1.Aerobic-need oxygen And [email\xa0protected] |
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