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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.
| 4651. |
Explain two main advantages associated with water harvesting at the communitylevel. |
| Answer» <p>Two advantagesassociated withwater harvesting at community levelare: (a) Overexploitation ofwaterresources will be reduced. (b) Helps to rechargethenatural wells and provides moisture for vegetation over a wide area.</p> | |
| 4652. |
4. Give the functions of the following cell organelles(c) Vacuolesib) Endoplasmic reticulum(a) Mitochondria(d) Lysosomes |
| Answer» <p>thanks</p> <p>thanks</p> | |
| 4653. |
4. What is meant by leaf venation. Name me l5. What is meant by photosynthesis ? What is the site of photosynthesis in piaims?TYRE QUESTIONS : ANSWER IN 20-25 WORDS |
| Answer» <p>Photosynthesis is a chemical process through which plants, some bacteria and algae, produce glucose and oxygen from carbon dioxide and water, using only light as a source of energy.Photosynthesis takes place in the leaves of green plants.</p> | |
| 4654. |
cell and cell organelles |
| Answer» <p>Ans :- The nucleus contains genetic information (DNA) on special strands called chromosomes. Function - The nucleus is the "control center" of thecell, forcellmetabolism and reproduction. THE FOLLOWINGORGANELLESARE FOUND IN BOTH PLANT AND ANIMALCELLS. 1. " ER" OR ENDOPLASMIC RETICULUM.</p> | |
| 4655. |
1. Can you name the tivo organellesve have studied that containtheir own genetic material? |
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| 4656. |
1.Can you name the two organelleswe have studied ththeir own genetic material?at contain |
| Answer» <p>jgmpmpwqwgmgdpwpwmwqjかまなまぬひさはあけまひるたさはやけやにやたしはたやにふまに</p> | |
| 4657. |
3. Find out my partnerBFungiProtozoaVirusAlgaeBacteriaChlorellaBacteriophageCandidaAmoebaProkaryotic |
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| 4658. |
A long spring when stretched by 2cm itspotential energy is U. If the same spring isstretched by 8cm the potential energy of thespring is1) 8U3) 4U2) 16U4) U |
| Answer» <p>1/2*5000U*0.08^2=16U</p> | |
| 4659. |
If the maximum height attained by a projectileisequaltothemaximum horizontal range of another projectile then what will be theratio of their velocity of projection.Ans、W2 : 1. |
| Answer» <p>wrong</p> | |
| 4660. |
A body is projected with velocity u. Themaximum range of the body is :-R=2(3) R =-(4) R = 4 |
| Answer» <p>for maximum range sin∅ = 1 or ∅ = 45° </p><p>so, range will be u²sin2∅/g = u²/g </p><p>option 3</p> | |
| 4661. |
Diseases like cholera, typhoid and jaundice are caused due to(a) polluted air(c) polluted waterâĄâĄ(b) polluted land(d) polluted soil |
| Answer» <p>Ans :- (c) polluted waterCholerais a waterbornedisease, which iscaused bybacterium Vibrio cholerae. The spreading ofthis diseaseis mainly through contaminated drinking water. Typhoidis an acute systemicdisease of Salmonella typhi, which used to be transmitted by the fecal-oral route through contaminated food and water</p> | |
| 4662. |
How is a virus different from other microbes? |
| Answer» <p>The biggest difference between viruses and bacteria is that viruses must have a living host - like a plant or animal-to multiply, while most bacteria can grow on non-living surfaces. There are some useful bacteria but all viruses are harmful. Antibiotics can kill bacteria but not viruses.</p> <p>thanks</p> <p>thanks</p> | |
| 4663. |
ars p's , sm shows mĂnimam de,iation of |
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| 4664. |
Find outHow long did it take for the plant to come outfrom the soil?. What was the difference in the height of theplant on the first and second day?On which day did the height of the plant increasethe most?Did new leaves come out of the plant every day?Was there any change in the stem of the plant?..DiscussUhich coods took the most number of days for the st |
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| 4665. |
A-4. A semicircular portion of radius r is cut from a uniform rectangular plate as shown in figure. Thedistance of centre of mass 'C of remaining plate, from point 'O' is:2rC 102r3r2(4-π)2r(4 + π)2r(B) 3(D)一一3(4-) |
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| 4666. |
8. Find out from internet what is golden rice. |
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| 4667. |
body of mass 5 kg is moving with velocity of 4 m/s. Calculate kinetic energypossessed by the body.with velociM-5kgAl 20J403E) of these(B) 30J(D) 50J |
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| 4668. |
cover?ii) A man walks at a speed of 1m/s and covers at certaindistance in some time. But, if he walks at a speed of 3m/s,he covers an additional distance of 15 m in the same time.What is the distance he actually covered?(242-5) |
| Answer» <p>= Let the actual distance be x.</p><p>= Given,</p><p>= If man walks at 1 m/s ---- he covers x m</p><p>= If he walks at 3 m/s---- he covers x + 15 m</p><p>= x + 15 = 3 * x</p><p>= - 2 x = - 15</p><p>= x = 7.5 m</p> <p>but how x+15=3*x</p> | |
| 4669. |
9. What is a chemical formula? Write the formula of the following com pounds:a) Nitric adid (b) Ammonia (e)Hydrogen chloride (d) Sulphuric acid (e) Potassium carbonate |
| Answer» <p>A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.</p> <p>(a)Nitric oxide (nitrogen oxide or nitrogen monoxide) is a colorless gas with the formula NO.</p><p>(b)The chemical formula of ammonia is NH3.(c)The chemical formula for hydrochloric acid is HCl</p><p>(d)The formula forsulfuric acid is H2SO4.</p><p>(e) Potassium carbonate (chemical formula: K2CO3), also known as potash.</p> | |
| 4670. |
V. Integer type questions.12.) A particle starts from rest. Its acceleration(a) versus time (t) is shown in figure. Themaximum speed of the particle will bems-1a ms"10 |
| Answer» <p>area under graph = change in velocity</p><p>=> ∆V = 1/2*(10*11)=> V-0 = 110/2=> v = 55 m/s </p> | |
| 4671. |
B2 g लक सर, का e L Do T M e e N W5ण् जब कोई अम्ल किसी श्वातु के साथ क्रिया करता है। तब ]होता है।(31) H, N, () 0, ) & » |
| Answer» <p>(अ) H₂</p><p>जब एक अम्ल धातु के साथ क्रिया करता है तो हाइड्रोजन गैस मुक्त होती</p> | |
| 4672. |
6. How trees help in increasing the water-holding capacity of the soil? |
| Answer» <p>thanks bro</p> <p>Trees help reduce stormwater runoff in several ways. One is to intercept falling rain and hold a portion of it on the leaves and bark. Part of this intercepted water will evaporate and part will be gradually released into the soil below. At the surface of the soil, fallen tree leaves help form a spongy layer that moderates soil temperature, helps retain soil moisture, and harbors organisms that break down organic matter and recycle elements for use in plant growth. This important layer also allows rain water to percolate into the soil rather than rushing off carrying with it oil, metal particles and other pollutants. Below ground, roots hold the soil in place and absorb water that will eventually be released into the atmosphere by transpiration.</p> | |
| 4673. |
3. TE TEHL UI a place above the sea level.4. The action of natural factors that leads to breakirsmaller pieces.5. The respiratory system of insects.Answer in two sentences only.1. What is rotation of crops?2. What are slivers?What is a thermos flask used for?1. Name any two strong acids.Define single displacement reaction with an examWhat are compounds? Give an example.Define greenhouse effect.Why do clouds thunder?What is meant by the water-holding capacity of s0. Name the two phases of breathing.nswer in about four to five sentences.Describe the process of feeding and digestion inList any three characteristics of wool fibre.Why should a laboratory thermometer be read whmaterial whose temperature is being measured?List any three uses of sulphuric acid.How is a cyclone formed? |
| Answer» <p>I hope this was helpful to you bro</p> <p>I hope that this was helpful to you bro</p> | |
| 4674. |
Q2:A car moving at 40 km/hr is to be stopped byapplying brakes in the next 4 m. If the carweighs 2000 kg, what average force must beapplied to stop it? |
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| 4675. |
solution.9. When a mixture of sand, common salt andammonium chloride is put in water the component/components which will dissolve in water is/are(a) ammonium chloride(b) sodium chloride(c) Both (a) and (b)(d) sand.onium chloride and |
| Answer» <p>c is the correct one</p> | |
| 4676. |
What are immuno suppressant drugs? |
| Answer» <p>immuno suppressant drugs are the medicines which inhibit or prevent the activity of immune system.these drugs are taken inorder to reduce the rejection of transplanted organ. ex: azathioprine</p> <p>hii</p> | |
| 4677. |
0gene, anorr geneOn |
| Answer» <p>An exampleofaregulator gene isagenethat codesfora repressor protein that inhibits the activityofanoperator gene(agenewhich binds repressor proteins thus inhibiting the translationofRNA to protein via RNA polymerase). In prokaryotes,regulator genes often codeforrepressor proteins.</p> | |
| 4678. |
2. p-type semiconductor. Such a semiconductor i |
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| 4679. |
H-2ユcalculate the percentage degree of dissociation of an electrolyte XY2 (Normal molar mass164) inwater if the observed molar mass by measuring elevation in boiling point is 65.6 |
| Answer» <p>The compound XY2 will dissociate as</p><p>XY2>>>>>X+2Y</p><p>Thus, the Van't Hoff factor will be given by 1+2d where d is the degree of dissociation.</p><p>But by definition, Van't Hoff factor is given by Normal mass/Observed mass. In this case, 164/65.6=2.5</p><p>Thus, by equating above two equations:</p><p>1+2d=2.5 which implies that d=0.75</p><p>Thus, percentage dissociation is 0.75×100=75%</p><p>The answer is 75%</p> | |
| 4680. |
E-2. Boiling point of a mixture of water and nitrobenzene is 99 C, the vapour pressure of water is 733 mm ofHg and the atmospheric pressure is 760 mm of Hg. The molecular weight of nitrobenzene is 123. Findthe ratio of weights of the components of the distillate |
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| 4681. |
The bulb of thermometer is kept above the surface of water while determining theboiling point eof water". Give reason. |
| Answer» <p>Bulb of a thermometer is always kept above the surface of water while determining the boiling point so as to make sure that the bulb doesn't breaks due to very high temperatureif the bulb is kept inside the boiling water it may break and the temperature cannot be taken.</p> <p>Theboiling pointis definedasthe temperature at which the vapour pressure is exactly equal to the external pressure. ... This, the steam justabovethewaterwill be a bettermeasureof theboiling pointbecause it will not yet have had a chance to cool down</p> | |
| 4682. |
hat kind of lens would formnverted and magnified image of the object? Coan erect and magnified image of the object? Cowinverted and diminished image of the objecterect and diminished image of the object? |
| Answer» <p>thnxx</p> | |
| 4683. |
HOTS questions:1. No flame is observed when coal burns but a flame can be seen when a candle is lighted. Why |
| Answer» <p>The substances which vaporize during burninggive flames. For example combustion of kerosene oil producesflame. On the other hand certain substances likecoal donot vaporizeandhence doesn't produce aflame.</p> <p>thnq</p> | |
| 4684. |
27, Draw a labeled diagram showing vacuole. Give its important feature andfunction. Differentiate between vacuoles of plant cell and animal cell |
| Answer» <p>Vacuoles are storage sacs for solid or liquid contents. Vacuoles are small sized in animal cells while in plant cells they are very large.The central vacuole of some plant cells may occupy 50-90% of the cell volume. In plant cells vacuoles are full of cell sap and provide turgidity and rigidity to the cell.</p><p>Many substances of importance in the life of the plant cell are stored in vacuoles. These include amino acids, sugars, various organic acids and some proteins.</p> <p>plant cell has only one large vacuole that covers almost 90% cellular space sometimes. Plant cells needs larger vacuole because vacuole helps them to maintain turgid pressure within the cell. Vacuoles store water and become turgid when water enters the cell through osmosis. When cell loses water vacuoles helps the cell to retain the shape. Vacuoles also maintain the osmotic concentration within the cell.</p><p>Animal cells have one or more vacuoles which are smaller in shape. In animal cell the main function of vacuoles is to store nutrients ,ions and water. Vacuoles plays an important role in endocytosis and exocytosis .They store the waste material (exocytosis) or food (endocytosis) and transport it inside the cell. Lysosomes secrete its enzymes within it and helps in digestion. bacteria are also engulfed by cell and destroyed in animal vacuole by lysosomal enzymes.</p> | |
| 4685. |
How does uncertainty relation accountfor natural width of spectral lines? |
| Answer» <p>Uncertainty principle: Energy level above ground state with energy E and lifetime Δt, has uncertainty in energy:</p><p>ΔEΔt ~h/2π</p><p>i.e. short-lived states have large uncertainties in the energy. </p><p>• A photon emitted in a transition from thislevel to the ground state will have a range of possible frequencies:</p><p>Δυ=1/(2πΔt) which account for the natural line width of spectral lines. </p> | |
| 4686. |
3 The Icinetic energy of an object ofmass. m moving with a velocityof 5 m s is 25 J. What Lwill be itskinetic energy when its velocityis doubled? What will be itskinetic energy when its velocityis increased three times? |
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| 4687. |
anything that has mass and occupies space? |
| Answer» <p>Matter is anything that occupies space and has mass. Mass is not quite the same as weight. Weight is related to the pull of gravity on an object. Mass is defined as a given quantity of matter regardless of the weight. The mass of an object would be the same on earth as it would on the moon which has much less gravity.</p> | |
| 4688. |
y moleculAn unknthere in this gas ?own gas occupies 322 mL at 29°C and 616 mm. How man |
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| 4689. |
44 gns of gas at STP occupies volutne ef 2.24 liners(A) OFor an ideal gas number of moles ner lit |
| Answer» <p>volume occupied by the gas is 2.24 so no. of moles is 2.24/22.4 = 0.1 moles</p><p> now w = 4.4 gm and no. of moles = 0.1 = w/M => M = w/0.1 = 4.4/0.1 = 44gm.</p><p> and 44gm is molar mass of CO2.OPTION D.</p> | |
| 4690. |
t extlaled air contains carbon dioxiDescribe the changes that take place (0) around the rib cage (i) diap(iii) chest cavity, during inspiration. State the effect of these changesiaphragm |
| Answer» <p>Change when we breathe in (inhale) :</p><p>When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward.</p><p>This increases the space in your chest cavity, into which your lungs expand. The intercostal muscles between your ribs also help enlarge the chest cavity.</p><p>They contract to pull your rib cage both upward and outward when you inhale.</p><p>Change when we breathe out (exhale) :</p><p>When you breathe out, or exhale, your diaphragm relaxes and moves upward into the chest cavity.</p><p>The intercostal muscles between the ribs also relax to reduce the space in the chest cavity.</p> | |
| 4691. |
tenttheforDaT UlTTC1. What is venation? Name two plants that have pai ullWhat is fibrous root? Draw a sketch of the fibrous root.What happens to the ovule and ovary after fertilisation?2.3. |
| Answer» <p>The pattern in arrangement of veins in the blade of a leaf is called as venation. Two types of venation are reticulate venation and parallel venation.</p> <p>The fibrous root system has a cluster of roots of the sane thickness and size arising from thr base of stem</p> | |
| 4692. |
density of waler l0. A cubical tank of side1 m is filled with 800 kgof a liquid. Find : (G) the volume of(in) the density of liquid in kg m-3 |
| Answer» <p>Thnx</p> | |
| 4693. |
2. Why do we say that potato is an underground stem |
| Answer» <p>It is astemvegetable. Thepotatoesgrow onunderground stems, called stolons.You canknowpotatotubers areactually thickenedstemsbecause they have buds that sproutstemsand leaves. Roots don'tdothat.</p> | |
| 4694. |
20. Silver (atomic weight 108 g mol ') has a densityof 10.5 g cm . The number of silver atoms on asurface of area 10"12 m2 can be expressed inscientific notation as y x 10%. The value ofr is(b) 5lo7 |
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| 4695. |
Silver crystallises in a face centered cubic lattice withall the atoms at the lattice points. The length of theedge of the unit cell as determined by X-ray diffraction4.077 × 10-8 cm. The density ofsilver is 10.5 g cm-3. Calculate the atomic mass of silver.studies is found to be(C.B.S.E. Foreign 2008) |
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| 4696. |
1 Silver crystallises in fcc lattice. If edge length of the cell is 4.07 x 10em and density is 10.5 g cm-3, calculate the atomic mass of silver. |
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| 4697. |
VeTIODopinion? Give one reasullSuggest two ways of reusing waste materialsofficesfrom our homes, school and4.Management Puzzle witthe he |
| Answer» <p>. Newspapers, Magazines, and Paper Bags</p><p>Over run by paper? There are lots ofgreat ways to re-purpose all the paper in your life. Get creative and create amazing and useful wovenbasketsandtraysout ofmagazinesandnewspapers. Recycle newspapers, grocery bags and magazines as wrapping paper. How about some compostableseed pots? OrDIY envelopesout of outdated calendar pages? And if you’re really ambitious, make a gorgeouswood-like flooring with paper bags.</p><p>.Plastic Bags</p><p>When the box of cereal is empty, save the inner bag, wash, dry and cut to wrap sandwiches. Plastic bags can be used a pet waste bags, or trash bins, or you can reuse them at the grocery store. Better yet, upcycle those plastic bags into nice-looking, sturdyreusable grocery totes!</p> | |
| 4698. |
A copper coin was kept dipped in silvernitrate solution for a few hours/ days.(a) What will happen to the copper coin?(b) What will happen to the colour of thesolutions? |
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| 4699. |
suggest two method to find out wind direction |
| Answer» <p>this is not correct answer</p> <p>u can just take some sand in yur palm and make it fall slowly from heoght the direction in which it will move will give u direction of wind</p><p>take a thin leave just make it fall the direction in whuch it will move will give u direction of wind</p> | |
| 4700. |
03 STANDARD ENTHALPY OF FORMATION |
| Answer» <p>The standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state (1 atm of pressure and 298.15 K) is formed from its pure elements under the same conditions.</p> | |