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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.
| 151. |
1. Why are coal and petroleum called fossil fuels? |
| Answer» <p>Petroleum, natural gas, and coal are the main sources of energy for modern use. All of these fuels are classified asfossil fuels. The reason they are called fossil fuels is because they are all made from decayed plants and animals that have been preserved in the earth 's crust by pressure, bacterial processes and heat. It takes millions of years for these organisms to chemically change into fossil fuels. we need to conserve them because these are non-renewable resources means these can not be re-produced.</p> | |
| 152. |
1. What are alkanes. |
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| 153. |
ns.Whiich machines run on muscular force?S. |
| Answer» <p>There are many machines that we use in our everyday life and need muscular force. Some of the machines that are run mostly on muscular force are:</p><p>• Bi-Cycle,</p><p>• Sewing Machine</p><p>• Hand-loommachines</p><p>However, without the support of muscular force, one cannot run such machines.</p> | |
| 154. |
E-2. Boiling point of a mixture of water and nitrobenzene is se c, the vapour pressure of water is 733 mm ofHg and the atmospheric pressure is 760 mm ct Hg. The molecular weight cf nitrobenzene is 123. Findthe ratio of weights of the components of the distilate |
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| 155. |
21. Write structural formula and dot structure of ethane. |
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| 156. |
Write whether the following statements are True or False? Justify your answer : If there is more than one lens in an eye it is called compound eye. |
| Answer» <p>this is not correct answerso it answer is false</p> | |
| 157. |
7. योग काजिए.(1123+0(2138 +433 |
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| 158. |
(xiv) Which one ofthe following shows maximum genetic diversity in India?a) Mangoc) Riceb) Ground nutd) Maize |
| Answer» <p>Answer: a)MangoExplanation:Mango has maximum genetic diversity in India.</p> | |
| 159. |
\frac{3}{5} \text { of } \frac{4}{7} \text { of } \frac{5}{9} \text { of } \frac{21}{24} \text { of } 504=? |
| Answer» <p>correct format </p><p>(3/5*4/7*5/9*21/24*504)</p><p>=84</p> | |
| 160. |
13 gp )4 45 4-1:-से बरa)) |
| Answer» <p>because it has been soft</p> <p>qnki ye soft ho jata hao</p> | |
| 161. |
Verify:(-30)x[13+(-3)]=[(-30)x13]+[(-30)(-3)] |
| Answer» <p>(-30)*(13+(-3)=(-30)*(13-3)=-30*10=-300[(-390]+(90)=-300 hence proved</p> | |
| 162. |
sound wave travels at a speed of 339 m s-1. If its wavelength1.5 cm, what is the frequency of the wave? Will it beudible? |
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| 163. |
4 Why is sound wave called a longitudinal wave? |
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| 164. |
8 Eaglian why siiting frteton is less than static friction. |
| Answer» <p>Thesliding friction is less than static frictionbecause of the interlocking of irregularities in the two surfaces. When the object startsslidingthe contact points on its surface, do not get enough time to lock into the contact points on the floor. So thesliding frictionis slightlyless thanthestatic friction.</p> | |
| 165. |
Explain the Law of Dominance using a monohybrid cross. |
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| 166. |
Fifty lamps each of resistance 100 Ω areconnected in parallel across a 220 V mainFind (a) the power consumed in watts, and (b)the cost of operating the lamps for 20 hoursat 10 paise per kWh |
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| 167. |
7. Would the bulb gow in the circuitshown in Fiz 12.157Fig. 12.15 |
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| 168. |
state condiions for tota inteshal flecatio |
| Answer» <p>Conditions for Total Internal Reflection</p><p>(a) The ray must travel from denser medium to rarer medium.(b) The angle of incidence i must be greater than critical angle C.</p> <p>thanks</p> | |
| 169. |
Suppose 10" J oflight energy is needed by the interior of the human eye to see an object How many photonsofgreen light (λ-550 nm) are needed to generate this minimum amount ofenergy? 2 J F h |
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| 170. |
Suppose the elements X and Y combine toform two compounds XY2 and XsY2. When0.1 mole of XY2 weighs 10 g and 0.05 mole ofX3Y weighs 9 g, the atomic weights of X and312Y are(a) 40, 30(c) 20, 30(b) 60, 40(d) 30, 20 |
| Answer» <p>let the molar mass of X be A and Y be B </p><p>now molar mass XY2 = A + 2B 10/(A+2B) = 0.1 => A +2B = 100.....(1)</p><p>and, molar mass X3Y2 = 3A+2B </p><p>=> 9/(3A+2B) = 0.05=> 3A +2B = 180....(2)</p><p>subtracting 1 from 2.=> 3A -A = 180-100 = 80=> A = 80/2 = 40.</p><p>so, B = 30.</p><p>option A.</p> | |
| 171. |
6, What is the change in internal energy when a gas contracts from 377 ml, to 177 ml under aconstant pressure of 1520 tor, while at the same time being cooled by removing 124 J heat?(a) 40.52 J(b) 83.48 J(c) 248 J(d) of these |
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| 172. |
53. The mass of a bottle filled with water is found to be150 g. The mass of the empty bottle is 50 g and theexternal volume of the container is 125 cm'. Findout the density of the material of the bottle. |
| Answer» <p>In an experiment to determine the density of sand using a density bottle, the following measurements were recorded:Mass of empty density bottle =43.2 gMass of density bottle full of water = 66.4 gMass of density bottle with some sand =67.5 gMass of density bottle with the sandfilled up with water =82.3 gUse the above data to determine the :(a) mass of water that completely filled the bottle;(b)volume of water that completely filled the bottle;(c)volume of the density bottle;(d)mass of sand;(e)mass of water that filled the space above the sand;(f)volume of sand;(g)density of sand;</p> | |
| 173. |
1. निम्न को घटाइए।(i) +32- (+12)(III) (-14)-(-20)(v) 23-(-10) |
| Answer» <p>32-(+12)</p><p>Final Result :</p><p>20</p> <p>(-14)-(-20)</p><p>Final Result :</p><p>6</p> <p>20</p> <p>32-(+12) final result 20</p> | |
| 174. |
20gm of common salt at 91°C immersed in 250 gramof turpentine oil at 13 C. The final temperature isfound to be 16°C. If the specific heat of turpentine oilis 0.428. Calculate the specific heat of common salt. |
| Answer» <p>can u give explation</p> | |
| 175. |
The sum of the digits of a two-digit number is 9. Also, nine times this number istwice the number obtained by reversing the order of the digits. Find the number. |
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| 176. |
FCietäşturn are Tand termscresenved? Name any two methods of food preservation |
| Answer» <p>Food preservation prevents the growth of microorganisms (such as yeasts), or other microorganisms , as well as slowing the oxidation of fats that cause rancidity.</p> <p>thanks</p> <p>methods of preservingvaccum packingadding of preservatives</p> <p>thanks</p> | |
| 177. |
KECPl's2. Describe a method to make simple pendulum. |
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| 178. |
Why is glass considered as supercooled liquid? |
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| 179. |
(O) osclilatorybuthotp3. The average velocity of molecules of a gas of molecular weight M at temperature T is2RTBRT(C) TM3RT |
| Answer» <p>option c) is correct as it is standard value can be derived from given values.</p> | |
| 180. |
Kirchhoff's Current Law, states that of current meetingat junction is___(a) Total sum, zero(C) Algebraic sum, zero(B) (D) Total sum, infinity |
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| 181. |
The covalent and van der Waals radi of nitrogenrespectively are -(1) 0.37 A, 1.2 A (2) 0.37 A,0.37 A(3) 12A, 12A (412 A, 0.37 A |
| Answer» <p>the covalent and vander Waal radii are 1.2A and 0.37 A</p> | |
| 182. |
What is on?12a |
| Answer» <p>In chemistry, orbital hybridisation is the concept of mixing atomic orbitals into new hybrid orbitals suitable for the pairing of electrons to form chemical bonds in valence bond theory.</p> | |
| 183. |
2. On the basis of Rutherford sSmodel of an atom, which sub-atomic particle is present in thenucleus of an atom? |
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| 184. |
Write a short composition on computer |
| Answer» <p>Acomputeris a machine that can be instructed to carry outsequencesofarithmeticorlogicaloperations automatically viacomputer programming. Modern computers have the ability to follow generalized sets of operations, calledprograms.These programs enable computers to perform an extremely wide range of tasks. A "complete" computer including thehardware, theoperating system(mainsoftware), andperipheralequipment required and used for "full" operation can be referred to as acomputer system. This term may as well be used for a group of computers that are connected and work together, in particular acomputer networkorcomputer cluster.</p> <p>Computer is data storage and processing device, that was once seen as a luxury has become a necessity these days. It is used to carry out various tasks at home as well as offices and other commercial spaces.</p><p>You will find below a number of short and long paragraphs on Computer. We hope these Computer paragraphs will help students in completing their school assignments. These will also help children to write and read out paragraphs with simple words and small sentences. Students can select any paragraph on Computer according to their particular requirement.</p> | |
| 185. |
3 A diver is able to cut throughwater in a swming pool Whichproperty of matter does thisobservation shou? |
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| 186. |
The most malleable metal is |
| Answer» <p>Gold isthe most malleableof allmetals; a single gram can be beaten into a sheet of 1 square meter, and an ounce into 300 square feet.</p> | |
| 187. |
0. The most malleable metal is |
| Answer» <p>Gold is the most malleable of all metals</p> | |
| 188. |
8.A body moves with constant velocity then acceleration is:(a) 0(b) 2m/s (c)-2m/s(d) All of these |
| Answer» <p>Ifa bodyismoving with constant velocity, acceleration is zero.</p> | |
| 189. |
a twalenă¤pipe-autawaln at thiof a house i 4X10t.CXplain |
| Answer» <p>Detergent is different. The surfactants it contains are made of molecules that have two different ends. One end is strongly attracted to water; the other is attracted to oily substances like grease. ... During the final spin, the dirty water flushes away, leaving your jeans clean again!The cleverest part of a washing machine isn't the drum or the drive belt, the electric motor that spins it around or the electronic circuit that controls the program: it's the detergent (soap powder or liquid) you put in right at the start. Water alone can't clean clothes because it won't attach to molecules of grease and dirt. Detergent is different. The surfactants it contains are made of molecules that have two different ends. One end is strongly attracted to water; the other is attracted to oily substances like grease.</p><p>Suppose you got some grease on your favorite jeans. No problem! Throw them into the washing machine with some detergent and this is what happens:</p><p>During the wash cycle, the surfactant (represented here by the orange blob) mixes with water.The grease-loving ends of the surfactant molecules start to attach themselves to the dirt on your jeans (shown by the brown blob on the leg). The tumbling motion beats your jeans about and breaks the dirt and grease into smaller, easier-to-remove pieces.During the rinse cycle, water molecules (blue blob) moving past attach themselves to the opposite, water-loving ends of the surfactant molecules.The water molecules pull the surfactant and dirt away from the jeans. During the final spin, the dirty water flushes away, leaving your jeans clean again!This is why soap and water clean better than either one of these things alone.</p> | |
| 190. |
Electron attributes negative charge, protons attribute positive charge. An atom has both butwhy there is no charge? |
| Answer» <p>When atom carries both electron and proton its positive and negative charge gets neutralized so they has no charge</p> | |
| 191. |
LIGHT, SHADOWS AND REFSUBJECT ASSESSMEIWORKSHEET-711ClassRollName...VERY SHORT ANSWER TYPE QUESTIONS (1 MARK)1. Define source of light.Ans. |
| Answer» <p>light is a one part of energy source</p> <p>sun, torch , candle tubelight</p> <p>sun light I think it is a</p> <p>ok good that answer was correct</p> <p>light is a one part of energy sources </p> <p>Alight sourceessentially is an optical transmitter that is paired with an optical receiver, both of which are connected to electrically based devices or systems. So, thesourceconverts electrons to photons and the detector converts photons to electrons</p> <p>light sourceessentially is an optical transmitter that is paired with an optical receiver, both of which are connected to electrically based devices or systems. So, thesourceconverts electrons to photons and the detector converts photons to electrons</p> <p>light sourceessentially is an optical transmitter that is paired with an optical receiver, both of which are connected to electrically based devices or systems. So, thesourceconverts electrons to photons and the detector converts photons to electrons</p> <p>Sun is the main source of light </p> <p>natural source -sun ..moon ...artificial source- torch ..bulb</p> <p>sun light is the correct answer of the given question</p> <p>Sun is a source of light and candle., torch etc</p> <p>there are many sources of lightas watersun ☀lightetc. </p> <p>when light fall on an object, some of the light is reflected back to our eyes and we able to see the object is know as light</p> | |
| 192. |
Calculate the ampere turns for acoil with 2000 turns and 5mAcurrent. |
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| 193. |
1Answer any three from among questions to 4.Complete the word pairCurrent: ampere - heat : .......following does not belong to the group |
| Answer» <p>Heat : Jouleis there anything elsethanks</p> <p>joule is the correct answer</p> <p>Joule is the correct answer</p> <p>joule is the correct answer of the given question</p> <p>the correct answer is joule of the following</p> <p>joule is the right answer</p> <p>Heat =joule so Joule is the right answer</p> <p>current : ampere :: heat : joulejoule is the correct answer of the given question. </p> | |
| 194. |
1. सैद्धान्तिक प्रश्न1. कोणीय त्वरण का SI मात्रक है-(a) Nkg-2(b) ms-2(c) rads-V(d) km kg- |
| Answer» <p>opt (c) is a correct answer </p> <p> rad s-2 is the correct answer</p> <p>कोणीय वेगमें परिवर्तन की दर कोकोणीय त्वरण(अंग्रेज़ी:Angular acceleration) कहते हैं।अन्तर्राष्ट्रीय इकाई प्रणालीमें इसका मात्रक रेडियन प्रति वर्गसैकण्ड(rad/s2) है और सामान्यतः इसे एल्फा (α) से प्रदर्शित किया जाता है।</p> <p>c) is the right answer</p> <p>radian per second ²is correct answer</p> | |
| 195. |
Which of the statements given below is correct?0 In winter the winds flow from the land to the ocean.In summer the winds flow from the land towards the ocean.A cyclone is formed by a very high-pressure system withhigh-speed winds revolving around it.)v) The coastline of India is not vulnerable to cyclones. |
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| 196. |
In Bryophytes diploid number of chromosomes occur in1) Gametes 2) Spores)(3) Spore mother cells (4) Nuclei of gametes |
| Answer» <p>option 3. spore mother cells</p> | |
| 197. |
Gametes are usually-(A) Haploid(C) Polyploid(B) Diploid(D) Nulliploid |
| Answer» <p>(A) Haploid</p><p>Gamete is always haploid, regardless the number of chromosome sets it has.</p> | |
| 198. |
been discovereu Dy BLICIJI JU TUa) One type-O b. Two types-0, A c. Three types-A, B and O. d. Four types-O, AB, A an4. A soldier is the one who fights to protect his country. Which of the following options of human bodycan be best compared to a soldier?a) Lungsb) Veins.c) Red blood cells.d) White blood cells.non in column v |
| Answer» <p>white blood cells helps fight against harming impurities in body which enters through blood</p> <p>c is the best answer</p> <p>white blood cell.......</p> <p>option no1a</p><p>blood cells </p> <p>white blood cells is the answer to your question</p> <p>white blood cells is the correct</p> <p>WBC because it fight with germs or any type of disease</p> <p> white blood cells is the answer to your questions</p> <p> White Blood Cells are compared to the soldiers of our body as they help fight germs</p> | |
| 199. |
(ii) Sertoli cells secrete a hormonea) Gonadotropinc) Relaxinb) Testosteroned) Inhibin |
| Answer» <p>ASertoli cell(a kind ofsustentacular cell) is a "nurse"cellof thetesticlesthat is part of aseminiferous tubuleand helps in the process ofspermatogenesis, the production ofsperm.</p><p>answer is b part</p> | |
| 200. |
26.A piece of wire is connected to the battery as shown.What happens to the heat generated if the () length of the wire is increased (i) thickness of the wireis increased? |
| Answer» <p>Where is the figure shown?</p> | |