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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.
| 21251. |
Azurite is an ore ofA. goldB. silverC. copperD. zinc |
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Answer» Correct Answer - C Azurite has a composition ` Cu(OH)_(2)*2CuCO_(3)` so , it is an ore of copper . |
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| 21252. |
Azurite is an ore ofA. AluminiumB. ZincC. IronD. Copper |
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Answer» Correct Answer - D Azurite is a soft, deep blue copper mineral, hydrated copper carbonate |
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| 21253. |
In the centext of the hall-heroul process for the extraction of `AI` , which of the following statement is false?A. `AI_(2)O_(3)` is mixed with `CaF_(3)` which lower the melting point of the mixture and brings conductivityB. `AI^(2+)` is reduced at the cathod to from `AI`C. `NaAIF_(6)` serves as the electrolyteD. `CO` and `CO_(2)` are produced in the process |
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Answer» Correct Answer - b In the Hall -Heroudt process for the extraction of `AI` purified `AI_(2)O_(3)` is mixed with `Na_(2) AIF_(4) or CaF_(2)` which lowers the melting point of the milt and bring condactivity The electrolytic reactions are `Calbode AI (melt) + 3e rarr AI(1)` `Anode C (s) + O^(2) (melt) rarr CO_(2)(g) + 4 e ` The oxygen gas librted at reaction with xcarbon electrodes to leberate `CO and CO_(2)` The overall reraction may be taken as ` 2AI_(2)O_(3) + 3C rarr AAI + 3CO_(2)` |
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| 21254. |
Cassiterite is an ore ofA. MaB. NiC. SbD. SO |
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Answer» Correct Answer - d The metal tin in the from state does not accure nqaturally .The main source is the mineral cossiberies or tinstone `SiO_(2)` found as low grade ore and alloweds in certain parts of the words . |
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| 21255. |
When compared to `DeltaG^(@)` for the formation of `Al_(2)O_(3), DeltaG^(@)` for the formation of `Cr_(2)O_(3)` is :A. sameB. unprdicatedC. lowerD. higher. |
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Answer» Correct Answer - D `DeltaG^(@)` for the formation of `Cr_(2)O_(3)` is higher. That is why `Cr_(2)O_(3)` can be reduced by aluminium metal where as the reverse is not true. |
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| 21256. |
The heat capacity at constant volume of an ideal gas depends on: A. the temperature B. the pressure C. the volume D. the number of molecules E. none of the above |
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Answer» D. the number of molecules |
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| 21257. |
Elemental `Si` in to be used as a semicondictor is parified byA. heating under vacumeB. flotatioC. zione refiningD. electrolyate |
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Answer» Correct Answer - c Zine refining is very useful foir produciing semtconductors and metals of very high purity. |
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| 21258. |
Select correct statementA. In the decomposition of an oxide into oxyhen and solid//liquid metal, entropy increases.B. Decomposition of an oxide is an endothermic change.C. To make `DeltaG^(@)` negative, temperature should be high enough so that `TDeltaS^(@)gtDeltaH^(@)`.D. All statements are correct. |
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Answer» Correct Answer - D (a)When the oxide undergoes a phase change, there will be an increase in the entropy of the oxide. (b) It is ture statements, `HgOoverset(Delta)rarrHg+1//2O_(2)` (C) For a reduction process the change in the free energy, `DeltaG^(@)` must be negative and to make `DeltaG^(@)` negative temperature should be high enough so that `T DeltaS^(@)gtDeltaH^(@`. |
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| 21259. |
Ellingham diargram respresents a graph ofA. `DeltaG vs T`B. `DeltaS^(@)vc T`C. `DeltaG^(@) vs T`D. `DeltaG vs P` |
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Answer» Correct Answer - C Ellingham diagram represents a graph of `DeltaG^(@)vsT`. |
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| 21260. |
Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100 W, 60 W, and 40 W bulbs have filament resistances R100 , R60 and R40 , respectively, the relation between these resistances is(a) 1/R100 = 1/R40 + 1/R60(b) R100 = R40 + R60(c) R100 > R60 > R40(d) 1/R100 > 1/R60 > 1R40 |
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Answer» Correct Answer is: (d) 1/R100 > 1/R60 > 1R40 Power P = V2/R 1/R100 = 1/R60 + 1/R40 As resistance increases with temperature, the equality does not hold exactly. Hence,1/R100 > 1/R60 > 1/R40 is the best option. |
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| 21261. |
A real gas behaves like an ideal gas if its (a) pressure and temperature are both high (b) pressure and temperature are both low (c) pressure is high and temperature is low (d) pressure is low and temperature is high |
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Answer» Correct Answer is: (d) pressure is low and temperature is high At low pressures, the number of molecules per unit volume decreases, so that the “point mass” approximation holds. Also, at high temperatures, the average speeds increase. |
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| 21262. |
Which biochemist along with Howard Florey and Ernst Chain, designed a lab-scale process to produce enough Penicillin for animal tests?(a) Sir Edward Penley Abraham(b) Dr. Norman George Heatley(c) Sir Alexander Fleming(d) Dr. Rudolph Emmerich |
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Answer» Right option is (b) Dr. Norman George Heatley Explanation: Dr. Norman George Heatley was able to develop the technique for efficiently purifying Penicillin in bulk for animal tests and by this, he invented the technique back-extraction. |
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| 21263. |
Calculate how much energy (kJ) is required to heat a bottle containing 300 mL of liquid water from room temperature (20 °C) to its normal boiling point (100 °C), while still remaining a liquid.(a) 104.4 kJ(b) 100.4 kJ(c) 140.4 kJ(d) 104.5 kJ |
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Answer» The correct answer is (b) 100.4 kJ Explanation: Enthalpy (“Water”, 20, 000,”l”) = 6.032 kJ/mol ((∫_{20}^{100} C_{pH_2O} dT)) = ( (frac{6.032 kJ}{mol}) (frac{1g}{ml}) (frac{mol}{18.02 g}) (frac{300 ml}{1})) = 100.4 kJ |
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| 21264. |
How much heat is produced by a human body?(a) 200 W(b) 100 W(c) 50 W(d) 0.5 W |
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Answer» The correct choice is (b) 100 W For explanation: A man doing no or very little physical work needs about 2,000 kcal (or less) of energy in his daily food. The body converts this energy almost entirely into heat. 1 day = 24 x 60 x 60 s = 86,400 s 1 cal = 4.2 J Hence, 2000 kcal/day = 2000 × 4.2 kj/day = (frac{8.4 ,Mj}{86600s}) = 100 j/s = 100 W We see that a human body doing no work is equivalent to a heat source of about 100 W – the equivalent of a good bulb. |
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| 21265. |
Which type of chromatography depends on the principle of size of particles?(a) Affinity chromatography(b) Gel- filtration chromatography(c) Ion- exchange chromatography(d) Multimodal chromatography |
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Answer» The correct choice is (b) Gel- filtration chromatography Easy explanation: Gel filtration chromatography, a type of size exclusion chromatography, can be used to either fractionate molecules and complexes in a sample into fractions with a particular size range, to remove all molecules larger than a particular size from the sample, or a combination of both operations. |
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| 21266. |
Which process is also called product recovery?(a) Upstream processing(b) Mid-stream processing(c) Downstream processing(d) Biological processing |
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Answer» Correct option is (c) Downstream processing To explain: Downstream processing implies manufacture of a purified product fit for a specific use, generally in marketable quantities, it also refers to the recovery and purification of biosynthetic products, particularly pharmaceuticals, from natural sources such as animal or plant tissue or fermentation broth, including the recycling of salvageable components and the proper treatment and disposal of waste. |
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| 21267. |
A solution of common salt in water is prepared by adding 20 kg of salt to 100 kg of water, to make a liquid of density 1323 kg/m^3. Calculate the concentration of salt in this solution as a (a) weight fraction, (b) weight/volume fraction, (c) mole fraction, (d) molal concentration.(a) 15.7%, 23.1%, 0.058, 3.88 moles in m^3(b) 14.5%, 22.4%, 0.059, 2.88 moles in m^3(c) 16.7%, 22.1%, 0.058, 3.77 moles in m^3(d) 14.7%, 23.1%, 0.059, 2.77 moles in m^3 |
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Answer» Right answer is (c) 16.7%, 22.1%, 0.058, 3.77 moles in m^3 To explain I would say: (i) Weight fraction: 20/(100+20) = 0.167; %weight/weight = 16.7% (ii) Weight/volume: A density of 1323kg/m^3 means that lm^3 of solution weighs 1323kg, but 1323kg of salt solution contains (20×1323kg of salt) / (100+20) = 220.5 kg salt/m^3 1 m^3 solution contains 220.5 kg salt. Weight/volume fraction = 220.5 / 1000 = 0.2205 And so weight / volume = 22.1% (iii) Moles of water = 100 / 18 = 5.56 Moles of salt = 20 / 58.5 = 0.34 Mole fraction of salt = 0.34 / (5.56 + 0.34) = 0.058 (iv) The molar concentration (M) is 220.5/58.5 = 3.77 moles in m^3. |
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| 21268. |
Convert 800 mmHg into bars.(a) 1.064 bars(b) 1.066 bars(c) 1.054 bars(d) 1.055 bars |
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Answer» The correct option is (b) 1.066 bars Easiest explanation: 1 mm Hg = 133.322 Pa and 1 bar = 10^5 Pa Therefore, bars = 800 mm Hg × (frac{133.322 ,Pa}{1 ,mm ,Hg} × frac{1 ,bar}{10^5 ,Pa}) = 1.066 bar. |
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| 21269. |
What do you mean by the term ”Backwashing”?(a) Excluding intermittent use of compressed air during process(b) Is a form of destructive maintenance(c) Washing at the backside of the filter(d) Including intermittent use of compressed air during the process. |
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Answer» The correct answer is (d) Including intermittent use of compressed air during the process. To elaborate: In terms of water treatment, including water purification and sewage treatment, backwashing refers to pumping water backward through the filters media, sometimes including intermittent use of compressed air during the process. Backwashing is a form of preventive maintenance so that the filter media can be reused. |
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| 21270. |
Conversion of 40 K into Celsius.(a) -233.15 °C(b) 233.15 °C(c) –245 °C(d) 245 °C |
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Answer» Right choice is (a) -233.15 °C To elaborate: T(°C) = T(K) – 273.15 = 40 – 273.15 = -233.15 °C. |
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| 21271. |
What type of filter does not come under the Membrane filters?(a) Ultra filtration(b) Microfiltration(c) Precoat (filter aid) filtration(d) Nanofiltration |
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Answer» Correct choice is (c) Precoat (filter aid) filtration The explanation is: A filter cake is formed by the substances that are retained on a filter. The filter cake grows in the course of filtration, becomes “thicker” as particulate matter is being retained. With increasing layer thickness the flow resistance of the filter cake increases whereas membrane filters do not use any filter aid. |
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| 21272. |
The visual output of chromatography is called?(a) Chromatograph(b) Chromatogram(c) Electropherogram(d) Autoradiogram |
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Answer» Correct choice is (b) Chromatogram Explanation: The machine used is called a gas or liquid chromatograph, the data generated is called a chromatogram. It is an electronic file or hardcopy containing the information generated during the chromatography run. |
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| 21273. |
Which of the following condition is of reverse phase chromatography?(a) The mobile phase is non-polar and stationary phase is polar(b) The mobile phase is polar and stationary phase is non-polar(c) Both the mobile phase and stationary phase are organic(d) Both the mobile phase and stationary phase are inorganic |
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Answer» Correct answer is (b) The mobile phase is polar and stationary phase is non-polar The best I can explain: In reversed phase chromatography, the mobile phase is polar (like water), and the stationary phase is non-polar while in normal phase chromatography, the mobile phase is non-polar (100% organic), and the stationary phase is polar. |
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| 21274. |
What do you mean by material balance equation?(a) Original-Solids-in-place (OSIP)(b) Original-Gas-in-place (OGIP)(c) Original-Air-in-place (OAIP)(d) Original-Liquid-in-place (OLIP) |
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Answer» Correct answer is (d) Original-Liquid-in-place (OLIP) Explanation: Material balance analysis is an interpretation method used to determine original fluids-in-place (OFIP) based on production and static pressure data. The general material balance equation relates the original oil, gas, and water in the reservoir to production volumes and current pressure conditions / fluid properties. |
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| 21275. |
In which of the following type of chromatography the capillary action mechanism is present?(a) Liquid chromatography(b) Gas chromatography(c) Thin- Layer chromatography(d) Paper chromatography |
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Answer» Correct choice is (d) Paper chromatography To explain: The most common type of chromatography. The paper is the stationary phase. This uses capillary action to pull the solutes up through the paper and separate the solutes. |
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| 21276. |
For which phase filter aid is used to filter?(a) Gas and liquid(b) Solid and Liquid(c) Gas(d) Gel |
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Answer» The correct option is (b) Solid and Liquid The explanation is: Filtration is the separation of solids from liquids by forcing the liquid to flow through a porous medium and depositing the solids on the medium. A filter aid (finely divided material added to the liquid to be filtered) helps control flow and solids removal. Precoat filtration is a type of mechanical filtration that can be used to clarify liquids. Filter aids such as diatomaceous earth, perlite and cellulose enables a liquid to pass through while retaining the haze-causing particles. |
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| 21277. |
What is the SI unit of apparent viscosity?(a) Pascal – second(b) Pascal(c) Newton – second(d) Newton / hr |
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Answer» Right choice is (a) Pascal – second Best explanation: Apparent viscosity has the SI derived unit Pa•s (Pascal-second, but the centipoise is frequently used in practice: (1 mPa•s = 1 cP). |
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| 21278. |
At what speed do you centrifuge blood?(a) 2200-2500 RPM(b) 3000-3200 RPM(c) 1000-1500 RPM(d) 4000 RPM |
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Answer» Correct option is (a) 2200-2500 RPM For explanation I would say: Do not centrifuge immediately after drawing blood. Allow the blood to clot in an upright position for at least 30 minutes but not longer than 1 hour before centrifugation. Perform venipuncture as with any other blood collection device. Centrifuge for at least 15 minutes at 2200-2500 RPM within one hour of collection. |
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| 21279. |
Which type of mechanism is applicable to chromatography?(a) Absorption and Desorption(b) Adsorption and Absorption(c) Adsorption and Desorption(d) Adsorption and Diffusion |
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Answer» Right option is (c) Adsorption and Desorption For explanation I would say: Adsorption means the attraction to a substance (as opposed to absorption, which means the complete envelopment of something). Desorption is the opposite – when something is not attracted to the substance. How it relates to chromatography is through the mobile and stationary phase. Depending on what the substance adsorbs or desorbs to, will determine how it will move in the chromatogram. For example, if it adsorbs to the mobile phase, it will move a lot. However, if it adsorbs to the stationary phase, it will not move very much. This is how mixtures are separated through chromatography, as different substances in the mixture will adsorb and desorb differently, and hence will move differently, and thus separation is achieved. |
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| 21280. |
Which of the following is not a type of centrifugation?(a) Hydro cyclone(b) Tubular centrifuge(c) Microfiltration(d) Disk stack separator |
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Answer» Correct choice is (c) Microfiltration Explanation: Microfiltration is a membrane filtration process which removes contaminants from a fluid by microporous membrane. The membrane pore size ranges from 0.1 to 10 micrometers. Microfiltration is different from reverse osmosis and nanofiltration because it does not require pressure and does not remove dissolved contaminants. However, centrifugation is often effective when the particles are very small and difficult to filter. |
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| 21281. |
Which of the following is not an example of a Non- Newtonian fluids?(a) Gels(b) Water(c) Suspensions(d) Pudding |
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Answer» Correct choice is (b) Water To elaborate: Water is a Newtonian fluid, because it continues to display fluid properties no matter how much it is stirred or mixed. A slightly less rigorous definition is that the drag of a small object being moved slowly through the fluid is proportional to the force applied to the object. (Compare friction). Important fluids, like water as well as most gases, behave – to good approximation – as a Newtonian fluid under normal conditions on Earth. |
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| 21282. |
Apparent viscosity for Non- Newtonian fluid is ____________(a) Constant(b) Depends on the shear stress(c) Depends on the shear rate(d) Dynamic |
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Answer» The correct choice is (c) Depends on the shear rate Explanation: Apparent viscosity (sometimes denoted η) is the shear stress applied to a fluid divided by the shear rate. For a Newtonian fluid, the apparent viscosity is constant, and equal to the Newtonian viscosity of the fluid, but for non-Newtonian fluids, the apparent viscosity depends on the shear rate. In such case, the ratio between shear stress and shear rate is not constant; nevertheless, this ratio for non- Newtonian fluids. |
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| 21283. |
Which of the following is used as a media for density gradient?(a) Agarose(b) Ficoll(c) Luria broth(d) Propylene glycol |
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Answer» Right answer is (b) Ficoll For explanation: Ficoll is a neutral, highly branched, high-mass, hydrophilic polysaccharide which dissolves readily in aqueous solutions. Ficoll is part of Ficoll-Paque, which is used in biology laboratories to separate blood to its components (erythrocytes, leukocytes, etc.). Ficoll-Paque is normally placed at the bottom of a conical tube, and blood is then slowly layered above Ficoll-Paque. |
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| 21284. |
What is rate-zonal centrifugation?(a) Based on separation of particles by mass(b) Based on separation of particles by density(c) Based on separation of particles on solubility(d) Based on separation of particles on size |
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Answer» Correct answer is (d) Based on separation of particles on size Explanation: Rate-zonal centrifugation is a centrifugation technique employed to effectively separate particles of different sizes. Once the centrifugation is over, fractions are collected. |
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| 21285. |
Estimate the correct straight line in the log-linear scale?(a) (If the population is growing exponentially, the curve will be concave up), (If the growth is slower than exponential, you will see a straight line), (If the growth is faster than exponential, the curve will be concave down)(b) (If the population is growing exponentially, the curve will be concave down), (If the growth is slower than exponential, you will see a straight line), (If the growth is faster than exponential, the curve will be concave up)(c) (If the population is growing exponentially, you will see a straight line), (If the growth is slower than exponential, the curve will be concave down), (If the growth is faster than exponential, the curve will be concave up)(d) (If the population is growing exponentially, you will see a straight line), (If the growth is slower than exponential, the curve will be concave up), (If the growth is faster than exponential, the curve will be concave down) |
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Answer» The correct choice is (c) (If the population is growing exponentially, you will see a straight line), (If the growth is slower than exponential, the curve will be concave down), (If the growth is faster than exponential, the curve will be concave up) Easy explanation: Functions plotted on the linear scale: Figure 1: Figure 2: Functions plotted on the log-linear graph: Figure 3 : Figure 4 : From the above graphs mentioned, Figures 2 and 4 grows exponentially while the function in Figures 1 and 3 grows slower than exponentially since the curve is concave down. |
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| 21286. |
The unit of pressure one bar is ___________(a) 1 Pascal(b) 1 kilo Pascal(c) 100 kPascal(d) 1000 kPascal |
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Answer» Right answer is (c) 100 kPascal Easiest explanation: A bar (b) is a metric measurement unit of pressure. One bar is equivalent to ten newtons (N) per square centimeter (cm^2). 1 bar = 100,000 Pascal = 100,000 N/m^2 = 100,000 N / (100*100cm^2) = 10 N/cm^2. |
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| 21287. |
Two immisible liquids are pured in a U-tube having densities `rho_(1) = 1.0 xx 10^(2) kg//m^(2) and rho_(2)2.0 xx 10^(3) kg//m^(3)`. Find the ratio of heights (of the liquids above their interface) `(n_(1))/(h_(2))` A. 3B. 6C. 9D. 12 |
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Answer» Correct Answer - A `p_(0)+rho_(1)gh_(1)=p_(0)+rho_(2)gh_(2)rArr (h_(1))/(h_(2))=(rho_(2))/(rho_(1))=3` |
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| 21288. |
Figure shows the roller coaster track. Each car will start from rest at point `A` and will roll with negligible friciton. It is important that there should be at least some small positive normal force exerted by the track on the car at all points, otherwise the car would leave the track. With the above fact, the minimum safe value for the radius of curvature at point `B` is `(g=10m//s^(2) :` A. 20 mB. 10 mC. 40 mD. 25 m |
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Answer» Correct Answer - A `V_(B)=sqrt(2xx10xx10),(m v_(B)^(2))/(R) le mg ,R ge (v_(B)^(2))/(g)` `rArr R ge 20 m`. |
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| 21289. |
What is positioned between mold and core surface?(a) Chaplets(b) Molding surface(c) Core seat(d) Mold cavity |
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Answer» The correct answer is (a) Chaplets The best explanation: Chaplets are a type of metal shape which are positioned between mold and core surface. These chaplets first melt and then they become a part of the castings. |
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| 21290. |
Relative density of mercury is _____________(a) 13.6(b) 1(c) 1000(d) 9.8 |
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Answer» Right choice is (a) 13.6 To explain I would say: Relative density of a substance is the ratio of its density to that of water.ie. So relative density of mercury is 13.6 means that density of mercury is 13.6 times the density of water. |
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| 21291. |
From the graph given which component has the higher elution rate?(a) A(b) B(c) A & B(d) None of the mentioned |
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Answer» Correct answer is (b) B The best explanation: Because Component A is adsorbed more strongly than B, and B is desorbed easily and has higher rate of elution as has a greater affinity towards the Stationary phase, As the solutes move through the stationary phase they separate. |
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| 21292. |
Theoretical plates are used to ___________(a) Determine the thickness of the mobile phase(b) Determine the thickness of the stationary phase(c) Estimate the efficiency of the column(d) Measure the distribution of the analyte between mobile and stationary phases |
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Answer» The correct option is (c) Estimate the efficiency of the column Best explanation: The plate model supposes that the chromatographic column contains a large number of separate layers, called theoretical plates. Separate equilibrations of the sample between the stationary and mobile phase occur in these “plates”. |
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| 21293. |
A radioactive nucleus can decay be either emitting an `alpha` particle or by emitting a `beta` particle. Probability of `alpha` decay is `75%` while that of `beta` decay is `25%` the decayconstatnt of `alpha` decay is `lamda_(1)` and that of `beta` decay is `lamda_(2)` is `(lamda_(1))/(lamda_(2))` |
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Answer» Correct Answer - 3 `(lamda_(1))/(lamda_(2))=(lamda_(1)N)/(lamda_(2)N)=("decay rate of alpha decay")/("decay rate of beta decay")` `=("probability of alpha decay")/("probability of beta decay")=((75)/(100))/((25)/(100))=3` |
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| 21294. |
Moseley plot for `k_(a)-` X-ray is shown. If moseley equation is given by `sqrt(f)=a(Z-b)` if constant a is given by `5xx10^(p)Hz^((1)/(2))` then `P` is |
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Answer» Correct Answer - 7 `sqrt(f)=a(Z-b)` `a="slope"=(0.5xx10^(9))/(10)=Hz^((1)/(2))` `0.95xx10^(9)=5xx10^(7)(20-b)impliesb=1` |
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| 21295. |
What type of surface you would observe in the case of mercury with glass?(a) Concave meniscus(b) Convex meniscus(c) Contact angle = 180°(d) Contact angle = 0° |
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Answer» Right option is (b) Convex meniscus Easiest explanation: A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container and Mercury does not wet glass – the cohesive forces within the drops i.e., bond between the molecules of mercury are stronger than the adhesive forces between the drops and glass. |
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| 21296. |
Which Word is Different?airplane, bird, rocket, cat, jet |
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Answer» Correct answer is cat |
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| 21297. |
Which Word is Different?bread, tea, coffee, milk, juice |
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Answer» Correct answer is bread |
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| 21298. |
A particle starts from the origin at time t = 0 and moves along the positive x-axis. The graph of velocity with respect to time is shown in figure. What is the position of the particle at time t = 5s?(1) 9 m(2) 6 m(3) 3 m(4) 10 m |
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Answer» The correct option is (1) 9 m. Explanation: Distance covered in 5 seconds = Area under v.t. graph = 1/2 × 2 × 2 + 2 × 2 + 1 × 3 = 9 m |
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| 21299. |
A potentiometer wire of length `10m` and resistance `20Omega` is connected in series with another resistance of `80Omega` and a battery of emf `4V`. The potential gradient on the wire will be (in `mV//cm`)A. `0.8`B. `0.16`C. `0.2`D. `0.4` |
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Answer» Correct Answer - A `V_(1):V_(2)=R_(1):R_(2)=1:4impliesV_(1)=(1)/(5)(4)=0.8V` `:.` Potential gradient `=(0.8)/(10)Vm^(-1)=0.08Vm^(-1)` `=0.8mV cm^(-1)` |
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| 21300. |
The element that does NOT show catenation is : (1) Sn (2) Si (3) Pb (4) Ge |
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Answer» Correct option: (3) Pb Explanation: The order of catenation in 14th group elements is (C >> Si > Ge » Sn). Pb does not show catenation. |
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