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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1501. |
PUDULLILI.which ultimately gets8. During photosynthesis plants synthesizeconverted into |
| Answer» <p>During photosynthesis plant synthesize starch which ultimately gets converted into carbohydrates</p> | |
| 1502. |
ervNall Name two types of fertilizers. |
| Answer» <p>OrganicFertilizers.( natural )</p><p>InorganicFertilizers.( man made)</p> | |
| 1503. |
name two types of spherical mirros ? which type of mirror can form a real image |
| Answer» <p>The name of two types of mirror1. Concave mirror2. Convex mirror The concave mirror can make the real image</p> | |
| 1504. |
which is greater -5 0r -1 |
| Answer» <p>-1 is greater.............. </p> <p>-1 is greater bcz zero ke jo jitna pas hoga bahi greater hoga</p> <p>-1 is greater than-5 ..</p> <p>-1 the correct answer of the given question</p> <p>-1 is greater because after zero negative numbers are less no. by no.</p> <p>-1 is the greater compare to the -5 because in negative numbers every right sidies number is greater and left sidies of number is small.</p> | |
| 1505. |
write application of electrochemical series with example |
| Answer» <p>(i)Reactivity of metals: The activity of the metal depends on its tendency to lose electron or electrons, i.e., tendency to form cation. This tendency depends on the magnitude of standard reduction potential. The metal which has high negative value (or smaller positive value) of standard reduction potential readily loses the electron or electrons and is converted into cation. Such a metal is said to be chemically active. The chemical reactivity of metals decreases from top to bottom in the series. The metal higher in the series is more active than the metal lower in the series. For example,</p><p>(a) Alkali metals and alkaline earth metals having high negative values of standard reduction potentials are chemically active. These react with cold water and evolve hydrogen. These readily dissolve in acids forming corresponding salts and combine with those substances which accept electrons.</p><p>(b) Metals like Fe, Pb, Sn, Ni, Co, etc., which lie a little down in the series do not react with cold water but react with steam to evolve hydrogen.</p><p>(c) Metals like Cu, Ag and Au which lie below hydrogen are less reactive and do not evolve hydrogen from water.</p><p>(ii)Electropositive character of metals:The electropositive character also depends on the tendency to lose electron or electrons. Like reactivity, the electropositive character of metals decreases from top to bottom in the electrochemical series. On the basis of standard reduction potential values, metals are divided into three groups</p><p>(a)Strongly electropositive metals :Metals having standard reduction potential near about – 2.0 volt or more negative like alkali metals, alkaline earth metals are strongly electropositive in nature.</p><p>(b)Moderately electropositive metals :Metals having values of reduction potentials between 0.0 and about – 2.0 volt are moderately electropositive Al, Zn, Fe, Ni, Co, etc., belong to this group.</p><p>(c)Weakly electropositive :The metals which are below hydrogen and possess positive values of reduction potentials are weakly electropositive metals. Cu, Hg, Ag, etc., belong to this group.</p><p>(iii)Displacement reactions</p><p>(a) To predict whether a given metal will displace another, from its salt solution: A metal higher in the series will displace the metal from its solution which is lower in the series, i.e., The metal having low standard reduction potential will displace the metal from its salt's solution which has higher value of standard reduction potential. A metal higher in the series has greater tendency to provide electrons to the cations of the metal to be precipitated.</p><p>(b) Displacement of one nonmetal from its salt solution by another nonmetal: A non-metal higher in the series (towards bottom side), i.e., having high value of reduction potential will displace another non-metal with lower reduction potential, i.e., occupying position above in the series. The non-metal's which possess high positive reduction potentials have the tendency to accept electrons readily. These electrons are provided by the ions of the nonmetal having low value of reduction potential,. Thus,can displace bromine and iodine from bromides and iodides.</p><p></p><p>.....(Oxidation)</p><p>.....(Reduction)</p><p>[The activity or electronegative character or oxidising nature of the nonmetal increases as the value of reduction potential increases.]</p><p>(c) Displacement of hydrogen from dilute acids by metals : The metal which can provide electrons toions present in dilute acids for reduction, evolve hydrogen from dilute acids.</p><p>.....(Oxidation)</p><p>.....(Reduction)</p><p>The metal having negative values of reduction potential possess the property of losing electron or electrons.</p><p>Thus, the metals occupying top positions in the electrochemical series readily liberate hydrogen from dilute acids and on descending in the series tendency to liberate hydrogen gas from dilute acids decreases.</p><p>The metals which are below hydrogen in electrochemical series like Cu, Hg, Au, Pt, etc., do not evolve hydrogen from dilute acids.</p><p>(d) Displacement of hydrogen from water : Iron and the metals above iron are capable of liberating hydrogen from water. The tendency decreases from top to bottom in electrochemical series. Alkali and alkaline earth metals liberate hydrogen from cold water but Mg, Zn and Fe liberate hydrogen from hot water or steam.</p><p>(iv)Reducing power of metals: Reducing nature depends on the tendency of losing electron or electrons. More the negative reduction potential, more is the tendency to lose electron or electrons. Thus reducing nature decreases from top to bottom in the electrochemical series. The power of the reducing agent increases, as the standard reduction potential becomes more and more negative. Sodium is a stronger reducing agent than zinc and zinc is a stronger reducing agent than iron. (decreasing order of reducing nature)</p><p></p><p>Alkali and alkaline earth metals are strong reducing agents.</p><p>(v)Oxidising nature of non-metals: Oxidising nature depends on the tendency to accept electron or electrons. More the value of reduction potential, higher is the tendency to accept electron or electrons. Thus, oxidising nature increases from top to bottom in the electrochemical series. The strength of an oxidising agent increases as the value of reduction potential becomes more and more positive.</p><p>(Fluorine) is a stronger oxidant thanand,(Chlorine) is a stronger oxidant thanand</p><p></p><p>Thus, inelectrochemical series</p><p></p><p>(vi)Thermal stability of metallic oxides :The thermal stability of the metal oxide depends on its electropositive nature. As the electropositivity decreases from top to bottom, the thermal stability of the oxide also decreases from top to bottom. The oxides of metals having high positive reduction potentials are not stable towards heat. The metals which come below copper form unstable oxides, i.e., these are decomposed on heating.</p> <p>🙃🙃</p> <p>2</p> | |
| 1506. |
Calculate e.m.f. of the following cell at 298 K2 Cr (s) + 3Fe+ (0-1 M)2Cr3 (0-01M)+3 Fe (s)(Given: E (C? cn)=-0.74V ; E。(Fe2+/Fe)=-0.44 V)(Cr3+ /Cr) |
| Answer» <p>ty</p> | |
| 1507. |
The molar ratio of Fe2 to Fe3+ in a mixure of FeS04 and Fe2(S04)3 having equal number of sulthate ion both Ferrous anol Ferric Sulhate is |
| Answer» | |
| 1508. |
b identify the following reactions as either oxidation orreduction:(ifi) Fe3e> Fe2+ |
| Answer» <p>Oxidation is loss of electronsReduction is gain of electrons</p><p>(I) O + 2e- ==> O2- In this oxygen is gaining electrons so its a reduction reaction</p><p>(2) K - e- ==> K+ In this potassium is losing electrons so its a oxidation reaction.</p><p>(3) Fe3+ + e- ==> Fe2+ In this iron is gaining electrons so its a reduction reaction</p> | |
| 1509. |
10. When we press the bulb of a dropper with its nozzle kept in water, arinen we press the bulb of a dropper with its nozzle kept in water, air inthe dropper is seen to escape in the form of bubbles. Once we release thepressure on the bulb, water gets filled in the dropper. The rise of water inthe dropper is due to(a) pressure of water.(b) gravity of the earth.(c) shape of rubber bulb. |
| Answer» | |
| 1510. |
How is sound Produced 2 |
| Answer» <p>Sound is produced to the vibration of an object</p> | |
| 1511. |
2. Your mother cooks food herself. Can she be called autotrophic? Give reasons. |
| Answer» <p>No,she cannot be called autotrophic because she does not prepare food out of simple molecules.Sheonly uses physical methods to make the food taste better.</p> <p>No, she cannot be called autotrophic because she does not prepare food out of simple molecules. She only the uses physical methods to make the food taste good.</p><p>Hope it helps u^_^</p> | |
| 1512. |
Define UNIVERSAL LAw DF RAVITATTONAL |
| Answer» <p>Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.</p> | |
| 1513. |
The atomic number and mass number of lithium are 3 and 7 respectively. What do you understand by this statement? |
| Answer» <p>It means that there are 3 protons and 4 neutrons in the nucleus. </p> | |
| 1514. |
Hence, we required approximate sum = (25,000+ 38,000 + 54,000= 1,11,0U.Find the approximate difference (784-349) to the nearest hundred.ble 8. |
| Answer» <p>784+349=435 nearest answer is 4000</p> <p>400 is the right answee</p> <p>400 is the answer of the following</p> | |
| 1515. |
Sample Problem 2. When a ball is thrown vertically upwards, it goesthrough a distance of 19.6 m. Find the initial velocity of the ball and the timetaken by it to rise to the highest point. (Acceleration due to gravity,8 -98 m/s)h so its |
| Answer» <p>Let initial velocity = u m/stime taken to rise to highest point = t secondfinal velocity at highest point = 0g = -9.8 m/s²distance travelled = 19.6 m</p><p>d = (v² - u²)/2a⇒ 19.6 = (0 - u²)/2×(-9.8)⇒ 19.6 = u²/19.6⇒ u² = 19.6×19.6⇒ u = 19.6 m/s</p><p>v = u+at⇒ 0 = 19.6 - 9.8t⇒ 9.8t = 19.6⇒ t = 19.6/9.8⇒ t = 2s</p><p>Initial velocity = 19.6 m/stime taken to reach highest point = 2s</p> <p>thank you</p> | |
| 1516. |
7.12 coplanar non collinear forces (all of equal magnitude) maintain a body in equilibrium,tbetween any two adjacent forces is(A) 150(B) 300(C) 45°(D) 60 |
| Answer» <p>for the forces to be in equilibrium 360/12 as a circle is of 360° and 12 forces are actinghence 30°option b</p> | |
| 1517. |
(e)Itis natural Fibre:(i) Rayon (ii) Nylon (ii) Silk (iv) Polyester |
| Answer» <p>iii) silk, as all other are synthetic fibre</p> <p>thanks</p> | |
| 1518. |
Food chain |
| Answer» <p>Ans :- A food chain is a linear network of links in a food web starting from producer organisms and ending at apex predator species, detritivores, or decomposer species. A food chain also shows how the organisms are related with each other by the food they eat. Each level of a food chain represents a different trophic level.</p> | |
| 1519. |
EXERCISESIn a democracy why is universal adult franchise important?1. |
| Answer» <p>IN a democratic country peoples and citizens of nations have a right to vote their own representatives.and India is also democratic nation so according to universal adult franchise citizen of 18 or more than 18 years have right to choose their own representatives. </p> | |
| 1520. |
What happens when earth heat up automatically? |
| Answer» <p>I think you are referring to global warming.In simple terms,as temperature rises,ice melts and sea level increases causing floods.Seasons are irregular and lots of other results</p> | |
| 1521. |
Is silver ore as attractive as silver |
| Answer» <p>Silveris known as a "precious metal" because it is rare and because it has a high economic value. It is valuable because it has a number of physical properties that make it the best possible metal for many different uses.Silverhas an electrical and thermal conductance that is higher than any other metal.</p> | |
| 1522. |
who is the founder of TV |
| Answer» <p>Ans :- Philo Taylor Farnsworth</p><p>Philo Taylor Farnsworthsuccessfully demonstrated the first television signal transmission on September 7, 1927 with his own scanning tube. A legal battle ensued in the late thirties, when RCA, the companyZworykinworked for wanted to claim the right to the patent (and the royalties)</p> | |
| 1523. |
b) Distinguish between thermoplastic and thermosetting resins. |
| Answer» <p>Thermo plastics</p><p>It can be melted and recycled.2 Dimensional with no crosslinks.Prepared mostly by additional polymerisation.Mostly processed by conventional methods such as injection molding, extrusion and blow molding.Examples include polyethylene (PE), polyethylene terphthalate (PET).Thermosetting plastics</p><p>It cannot be melted and recycled.3 Dimensional with multiple crosslinks.Prepared mostly by condensation polymerisation.Mostly processed by special methods such as compression, transfer and casting.Examples include Phenol formaldehyde, melamine formaldehyde.</p> | |
| 1524. |
(b) Distinguish between thermoplastic and thermosetting resins. |
| Answer» <p>Thermo plastics</p><p>It can be melted and recycled.2 Dimensional with no crosslinks.Prepared mostly by additional polymerisation.Mostly processed by conventional methods such as injection molding, extrusion and blow molding.Examples include polyethylene (PE), polyethylene terphthalate (PET).</p><p>Thermosetting plastics</p><p>It cannot be melted and recycled.3 Dimensional with multiple crosslinks.Prepared mostly by condensation polymerisation.Mostly processed by special methods such as compression, transfer and casting.Examples include Phenol formaldehyde, melamine formaldehyde.</p> | |
| 1525. |
bio degradable polymers |
| Answer» | |
| 1526. |
2. Where is the magnetic force strongest in amagnet?a) north poleb) south polec) middled) both poles |
| Answer» <p>The magnetic force is equally as strong at both the north and south pole.</p> <p>In Both poles magnetic force strongest in a magneg...</p> <p>d. both ( The magnetic force is equally strong at both the North and South Pole</p> <p>by attaching north pole to South pole</p> <p>The magnetic field generated by any magnet is always strongest at either pole. The magnetic force is equally as strong at both the north and south pole.</p><p>hope it helps ☺️ u stay blessed n have a good luck</p> <p>d.both(The magnetic force is equally strong at both the North and South pole)</p> <p>option d is the correct answer</p> <p>option D..............Both .....ok</p> <p>In both poles magnetic force strongest in a magnet...... </p> <p>The magnetic force is equally strong at both the north and south pole</p> <p>magnetic force strongest on both pols</p> <p>in the middle of earth and south pole and North pole have same magnetic force because the strongest magnetic force is middle of earth .I hope you understand .you understand the please like and comment</p> | |
| 1527. |
What is considered as strongest natural fibre |
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| 1528. |
A wheel fitted tightly with an rodthrough its centre is called I ](1) pulley and rod 2) wheel android3 wheel and ade 4) pulley and se |
| Answer» <p>pulley and rod because it is been pulled through force </p> <p>3) wheel and axle is the answer</p> <p>OPTION 3) WHEEL And AXLE</p> | |
| 1529. |
3.A wheel fitted tightly with an rocthrough its centre is called I(1) pulley and rod 2) wheel and rod(3) wheel and axle (4) pulley and are |
| Answer» <p>wheel and axle is correct answer.</p> | |
| 1530. |
Two forces of magnitude 8 N and 15 N respectivelyact at a point. If the resultant force is 17 N, theangle between the forces has to be(1) 60(3) 90°(2) 45°(4) 30° |
| Answer» <p> option 3 is the answer. </p> | |
| 1531. |
A person has a hearing range from 20 Hz to 20 kHz. What arethe typical wavelengths of sound waves in air correspondingto these two frequencies? Take the speed of sound in air as344 m s1 |
| Answer» | |
| 1532. |
e ismalleability of metals used in our daily lifpl |
| Answer» <p>Given some examples where the property-malleability and ductility of metals are used in our daily life. Malleability means that metals can be hammered into sheets and foils. For example, aluminium foils are used for wrapping food stuffs, silver foils are used for decorative purposes on sweets and fruits.</p> | |
| 1533. |
what is polymer |
| Answer» | |
| 1534. |
Q 6. Mustard oil and grease botih are insoluble in water, but mustard oil floats whereas grease settlesdown, why ?Ans. |
| Answer» <p>Theoilalwaysfloatsto the top because it is less dense thanwater.Oilandwaterdon't mix becausewatermolecules are more attracted to each other than tooilmolecules</p> <p>thanku</p> | |
| 1535. |
SOUND NEEDS A MEDIUM TO TRAVEL |
| Answer» <p>That's becausesoundis a mechanical wave. ... In contrast, electromagnetic wavesrequirenomedium, but can still travelthrough one. Since a vacuum is defined as lacking amedium, thensoundand correspondingly, mechanical waves, cannot propagate through a vacuum. This is why we can't hear voices orsoundsin space.</p> | |
| 1536. |
06 Mustard oil and grease botic are insoluble in water, but mustard oil floats whereas grease settlesdown, why ?Ans. |
| Answer» <p>Theoilalwaysfloatsto the top because it is less dense thanwater.Oilandwaterdon't mix becausewatermolecules are more attracted to each other than tooilmolecules</p> | |
| 1537. |
A force F+6+3k acting on a particle producesa displacement of S- 23+5k where F isexpressed in newton and S in metre. Find the workdone by the force.(Ans : 41J) |
| Answer» | |
| 1538. |
A force F 4i + 6j +3k acting on a particle producesa displacement of S- 2i+3+5k where F isexpressed in newton and S in metre. Find the work)done by the force.(Ans: 41J) |
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| 1539. |
36. (a) What is the basic difference between asexual and sexual reproduction? |
| Answer» <p>Thanks:) </p> | |
| 1540. |
Why are solids rigid? |
| Answer» <p>The particles of solids are close packed and can only oscillate about their fixed positions. These properties make solids rigid.</p> | |
| 1541. |
True or false polyester is a natural fibre |
| Answer» <p>False, Polyester is not a natural fibre it is synthetic</p> | |
| 1542. |
What is food web? |
| Answer» <p>A food web (or food cycle) is a natural interconnection of food chains and a graphical representation (usually an image) of what-eats-what in an ecological community</p> | |
| 1543. |
Why are solids rigid? |
| Answer» | |
| 1544. |
Explain how is the acceleration due to gravityat e latitude due to the rotational motion of the |
| Answer» <p>post clear and full photo </p> <p>what</p> <p>your question which you have send is not clear so plz re send the picture 😊</p> | |
| 1545. |
What is acceleration due to gravity? |
| Answer» <p>In physics, gravitational acceleration is the acceleration on an object caused by the force of gravitation. Neglecting friction such as air resistance, all small bodies accelerate in a gravitational field at the same rate relative to the center of mass.</p> | |
| 1546. |
What is acceleration due to gravity? |
| Answer» | |
| 1547. |
what are three steps writing the formula give example |
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| 1548. |
Name two animals which reproduce) by giving birth to babies. hA20. |
| Answer» <p>Animals that give birth to their young ones alive are Humans, Cow, dogs, etc</p> | |
| 1549. |
telSP(vi) Rosethe correct answer:10.TicThe reproductive part of a plant is the(ii) stem(iii) root(iv) flower(i) leafnf the male and the female gametes i |
| Answer» <p>flower is the reproductive part of a plant</p> <p>the reproductive part of plant is the flower</p> <p>flowers flowers flowers</p> | |
| 1550. |
Answer TuExplain the Binary system |
| Answer» <p>Number system that uses only two values (0,1; on, off) to represent codes and data. Since zeros and ones can be easily represented by two voltages, the binary system is the foundation on which digital technology is built. Every digital computer whether a pocket calculator or a mainframe uses the same binary notation.</p> | |