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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following do not comes under continuous filtration?(a) Vacuum rotary drum filter(b) Rubber belt filter(c) Belt filter cake discharge(d) Disc filter |
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Answer» Correct choice is (d) Disc filter The explanation is: Disc filter, this type of filter is fed continuously for a certain amount of time. Then feed is stopped and next batch steps follow, like cake wash, cake blow and cake discharge. |
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| 2. |
Which of the following centrifugation is used to separate certain organelles from whole cell?(a) Rate-zonal centrifugation(b) Normal centrifugation(c) Differential centrifugation(d) Isopycnic centrifugation |
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Answer» Right option is (c) Differential centrifugation Easy explanation: The simplest form of separation by centrifugation is differential centrifugation, sometimes called differential pelleting. Particles of different densities or sizes in a suspension will sediment at different rates, with the larger and denser particles sedimenting faster. These sedimentation rates can be increased by using centrifugal force. A suspension of cells subjected to a series of increasing centrifugal force cycles will yield a series of pellets containing cells of decreasing sedimentation rate. Differential centrifugation is a common procedure in microbiology and cytology used to separate certain organelles from whole cells for further analysis of specific parts of cells. |
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| 3. |
From the following which is the type of filtration centrifuge?(a) Screen/scroll centrifuge(b) Tubular centrifuge(c) Decanter centrifuge(d) Separator centrifuge |
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Answer» Right choice is (a) Screen/scroll centrifuge Easiest explanation: For the filtration or the so-called screen centrifuge the drum is perforated and is inserted with a filter, for example a filter cloth, wire mesh or lot screen. The suspension flows through the filter and the drum with the perforated wall from the inside to the outside. In this way, the solid material is restrained and can be removed. The kind of removing depends on the type of centrifuge, for example manually or periodically. |
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| 4. |
A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m^3/ (m^2.d). The design capacity of the water works is 0.35 m^3/s. The maximum surface per filter is limited to 50 m^2 and find out the normal filtration rate?(a) 154.3 m^3/(m^2.d)(b) 154.6 m^3/(m^2.d)(c) 155.6 m^3/(m^2.d)(d) 155.3 m^3/(m^2.d) |
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Answer» The correct choice is (a) 154.3 m^3/(m^2.d) For explanation I would say: Select four filters . The surface area for each filter is, a = 189 m^2/4 = 47.25 m^2 We can use 7 m×7 m or 6 m×8 m or 5.9 m×8 m (exact) If a 7 m×7 m filter is installed, the normal filtration rate is V = Q/A = (0.35 m^3/s×86,400s/d)/(4×7 m×7 m) = 154.3 m^3/(m^2.d) |
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| 5. |
Two methanol-water mixtures are contained in separate tanks. The first mixture contains 40.0 wt% methanol and the second contains 70.0 wt% methanol. If 200 kg of the first mixture is combined with 150 kg of the second, what are the mass and composition of the product (Total balance, Methanol balance, Physical constraint)?(a) 350 kg, 0.529, 0.471(b) 320 kg, 0.529, 0.521(c) 360 kg, 0.620, 0.471(d) 350 kg, 0.690, 0.760 |
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Answer» Right answer is (a) 350 kg, 0.529, 0.471 To elaborate: Material Balances (Steady-State, Non-Reactive Process) : Total Balance: m1 + m2 = m3 Methanol-Balance: m1xM1 + m2xM2 = m3xM3 Water-Balance: m1xw1 + m2xw2 = m3xw3 (choose only 2 equations since one of them is no longer independent) Physical Constraint (applied to mixture 3): xM3 + xW3 = 1.00 Always start with the equation with the least number of unknowns if possible and minimize solving equations simultaneously. Total Balance (m3) ↓ Methanol Balance (xM3) ↓ Physical Constraint (xW3) Total balance: m3 = (200 kg) + (150 kg) m3 = 350 kg CH3OH balance: (200 kg)(0.40) + (150 kg)(0.70) = (350 g)xM3 xM3 = 0.529 Physical constraint: xW3 = 1.00 – xM3 = 1 – 0.529 xW3 = 0.471. |
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| 6. |
Each year 80,000 people move into a city, 70,000 people move out, 18,000 are born, and 11,000 die. Write a balance on the population of the city.(a) 17,000 P/yr(b) 15,000 P/yr(c) 20,000 P/yr(d) 22,000 P/yr |
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Answer» The correct answer is (a) 17,000 P/yr Explanation: Let P denotes people, Input + Generation – Output – Consumption = accumulation 80,000 P/yr + 18,000 P/yr – 70,000 P/yr – 11,000 P/yr = A(P/yr) A = 17,000 P/yr Each year the city’s population increases by 17,000 P/yr. |
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| 7. |
At 0 K which of the following properties of a gas will be zero?(a) Kinetic energy (b) Potential energy(c) Vibrational energy (d) Density |
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Answer» Correct option (a) Kinetic energy |
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| 8. |
What is the combined feed ratio from the following?(a) Quantity of mixed feed stream to the quantity of fresh feed stream(b) Quantity of recycle stream to the quantity of fresh feed stream(c) Quantity of fresh feed stream to the quantity of recycle stream(d) Quantity of fresh feed stream to the quantity of mixed feed stream |
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Answer» The correct answer is (a) Quantity of mixed feed stream to the quantity of fresh feed stream Best explanation: Combined feed ratio is the ratio of the quantity of mixed feed stream to the quantity of fresh feed stream. Combined feed ratio = M/F. |
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| 9. |
Ellingham diagram respresents:A. change of `DeltaG` with temperature.B. change of `DeltaH` with temperature.C. change of `DeltaG` with pressure.D. change of `(DeltaG - TDeltaS)` with temperature. |
| Answer» Correct Answer - A | |
| 10. |
Which of the following gases possess maximum rms velocity, all being at the same temperature? (a) Oxygen (b) Air(c) carbon dioxide(d) Hydrogen |
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Answer» Correct option (d) Hydrogen |
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| 11. |
Which of the following statements is true?A. Raduction of a metal oxide is easier if the metal formed is in liquid state at reduction temperatureB. Reduction of metal oxide is normally less feasible at high temperatureC. The oxidation of `CO` into `CO_(2)` will have a negative slope on Ellingham diagramD. The reactive metals have positive slope for oxidation on Ellingham diagram whereas no-reactive metals have a negative slope |
| Answer» Correct Answer - A | |
| 12. |
The internal energy of an ideal gas depends on: A. the temperature only B. the pressure only C. the volume only D. the temperature and pressure only E. temperature, pressure, and volume |
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Answer» A. the temperature only |
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| 13. |
The main reaction occuring in blast furnace during the extraction of iron form haematite isA. `Fe_(2)O_(3) +3Crarr2Fe+3CO`B. `FeO+SiO_(2)rarr FeSiO_(3)`C. `Fe_(2)O_(3) +3CO rarr 2FE_(3)O_(4)+CO_(2)`D. `CaO+SiO_(2)rarr CaSiO_(3)` |
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Answer» Correct Answer - C `3Fe_(2)O_(3) +3CO rarr 2Fe_(3)O_(4)+ CO_(2)` `Fe_(3)O_(4) +Co rarr 2FeO + CO_(2)` `FeO + CO rarr Fe + CO_(2)` |
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| 14. |
Formation of metallic copper from sulphide ore in te normal thermometallurgical process essentially involves which of the following reactionsA. `CuS+(3)/(2)O_(2)rarrCuO +SO_(2)`, `CuO+C rarr Cu+CO`B. `CuS+(3)/(2)O_(2)rarr3Cu +SO_(2)`, `2CuO+CuS rarr 3CuO +SO_(2)`C. `CuS +2O_(2)rarr CuSO_(4)`,D. `CuS +(3)/(2)O_(2)rarr CuO+SO_(2)` |
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Answer» Correct Answer - B `CuS +(3)/(2)O_(2)rarr 3CuO +SO_(2)`, `2CuO + CuS rarr 3Cu+SO_(2)` |
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| 15. |
when compared to `DeltaG^(@)` for the formation of `A1_(2)O_(3)` the `Deltag^(@)` for the formation of `Cr_(2)O_(3)` isA. SameB. LowerC. HigherD. Unpredicated |
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Answer» Correct Answer - C `DeltaG` is less negative for `(Cr_(2)O_(3))`. |
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| 16. |
The specific heat 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» E. none of the above |
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| 17. |
The minimum voltage required to electrolyse alumina in the Hall-Heroul process is [Given, `DeltaG^(@)_(f)(A1_(2)O_(3)) =- 1520kJ//mol` and `DeltaG^(@)_(f)(CO_(2)) = 394kJ//mol]`A. `1.60V`B. `1.575V`C. `1.312V`D. `-2.62V` |
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Answer» Correct Answer - A In hall-Heroult process the following reactions occur `3C+2A1_(2)O_(3)rarr4A1+3CO_(2)` `DeltaG^(@) = 3Delta_(f)G^(@)(CO_(2))-2Delta_(f)G^(@)(A1_(2)O_(2))` `=3 (-394)-2(-1520) = 1858kJ` `DeltaG^(@) = nFE^(@)=` or `=-E^(@)` `=(DeltaG^(@))/(nF)= = (1858xx1000)/(12xx96500) = 1.60V` |
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| 18. |
which of the following electronts is present as the impurity to the maximum extent in the pig iron?A. CarbonB. SiliconC. PhosphorusD. Manganese |
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Answer» Correct Answer - A `4%` Carbon |
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| 19. |
when compared to `DeltaG^(@)` for the formation of `A1_(2)O_(3)` the `Deltag^(@)` for the formation of `Cr_(2)O_(3)` isA. lowerB. higherC. sameD. unpredicted |
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Answer» Correct Answer - B `DeltaG^(@)` is higher for the formation of `Cr_(2)O_(3)`. |
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| 20. |
which of the following electronts is present as the impurity to the maximum extent in the pig iron?A. PhosphorusB. ManganeseC. CarbonD. Silicon |
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Answer» Correct Answer - C Carbon is present as an impurity in the pig iron (4%). Many other impurities such as S,P,Si and Mn are present in smaller amount. |
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| 21. |
Purest form of commercial iron is :A. Cast ironB. SteelC. Wrought ironD. Pig iron |
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Answer» Correct Answer - C Wrought iron is the purest form of iron as it contains minimum amount of carbon `(0.12-0.25%)` |
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| 22. |
In the electrolytic refining of zinc,A. grahite is at the anodeB. the pure metal is at the cathodeC. the metal ion gets reduced at the anodeD. acidified zinc sulphate is the electrolyte |
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Answer» Correct Answer - B In the electrolytic refining of zinc, anode is made up of imure zinc while a strip of pure zinc acts as cathode. |
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| 23. |
Identify the reaction that does not take place in a blast furnaceA. `CaCO_(3)rarrCaO +CO_(2)`B. `CaO+SiO_(2)rarrCaSiO_(3)`C. `CO_(2) +Crarr 2CO`D. `2Fe_(2)O_(3) +3Crarr 4Fe +3CO` |
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Answer» Correct Answer - D Iron is produted by the following reaction. `FeO +C rarr 2CO` |
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| 24. |
In the electrolytic refining of zinc,A. the impure metal us not of zincB. graphite is at the anodeC. the metal ion gets reduced at the anodeD. acidified zinc sulphate is the electrolyte |
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Answer» Correct Answer - D Electrodes are suspended in an electroylte which is the solution of a soluble salt of the metal usually a double salt of the metal. |
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| 25. |
Two thin discs, each of mass M and radius r meter, are attached as shown in the fig. to form a rigid body. The rotational inertia of this body about an axis perpendicular to the plane of disc B passing through its centre is |
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Answer» The moment of inertia of the disc about the centroidal axis is Mr2/2. The moment of inertia of the disc at A about the axis passing through B is given using parallel axis theorem as Mr2 + M(2R)2 Thus the total moment of inertia of the whole system is given as Mr2/2 + Mr2 /2 + M(2R)2 = 5Mr2. |
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| 26. |
What is Internal Reflection? |
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Answer» Total internal reflection is a phenomenon of reflection of ray back to the same medium when passing from denser medium to rarer medium in a such away that angle of incidence greater than its critical angle. |
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| 27. |
Comment whether the following quantities can be called as properties or not :(i) \(\int pdV\)(ii) \(\int Vdp,\)and(iii) \(\int pdV\) + \(\int Vdp\). |
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Answer» (i) \(\int pdV\): p is a function of V and integral can only be evaluated if relation between p and V is known. It is thus an inexact differential and hence not a property. (ii) \(\int Vdp,\): It is not a property for the same reason as mentioned in (i). (iii) \(\int pdV\) + \(\int Vdp\). \(\int pdV\) + \(\int Vdp\) = \(\int pdV\) + Vdp = \(\int\) d(pV) = pV. Thus the integral can be evaluated without knowing the relation between p and V. It is an exact differential and hence it is a property. |
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| 28. |
A temperature scale of certain thermometer is given by the relation t = a ln p + b where a and b are constants and p is the thermometric property of the fluid in the thermometer. If at the ice point and steam point the thermometric properties are found to be 1.5 and 7.5 respectively what will be the temperature corresponding to the thermometric property of 3.5 on Celsius scale. |
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Answer» t = a ln p + b ...(Given) On Celsius scale : Ice point = 0°C, and Steam point = 100°C \(\therefore\) From given conditions, we have 0 = a ln 1.5 + b ...(i) and 100 = a ln 7.5 + b ...(ii) i.e., 0 = a × 0.4054 + b ...(iii) and 100 = a × 2.015 + b ...(iv) Subtracting (iii) from (iv), we get 100 = 1.61a or a = 62.112 Substituting this value in eqn. (iii), we get b = – 0.4054 × 62.112= – 25.18 ∴ When p = 3.5 the value of temperature is given b t = 62.112 ln (3.5) – 25.18= 52.63°C. |
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| 29. |
management is an art and science are not mutually execute but complement Each Other your data |
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Answer» However, since management deals with human beings and human behaviour, the outcomes of these experiments are not capable of being accurately predicted or replicated. Therefore, management can be called an inexact science. ... Management as an art and a science are therefore not mutually exclusive but complement each other. |
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| 30. |
How the five laws of library science help in book selection? Discus the demand theory of book selection? |
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Answer» Five laws of library science in book selection: i. “Books are for use” says that only those books should be selected which could be used in the library. ii. Second law “Every reader his/her book” say that user need should be addressed. iii. Third law “Every book its Reader” say that only those books should be selected and Procured which has existing or potential demand. iv. Fourth law “Save the time of Reader “guides for visualization for anticipatory demand and accordingly selection of the books. v. Fifth law “Library is a growing organism” says that book selection and acquisition should be a continuous process. According to Demand theory, demand for books should be differentiated according to its values variety and volumes. |
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| 31. |
What do you mean by Identity theft? Explain with the help of an example. |
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Answer» Identity theft is the crime of obtaining the personal or financial information of another person for the sole purpose of assuming that person's name or identity to make transactions or use it to post inappropriate remarks, comments etc. Example: Alex likes to do his homework late at night. He uses the Internet a lot and also sends useful data through email to many of his friends. One Day he forgot to sign out from his email account. In the morning, his twin brother, Flex started using the computer. He used Flex’s email account to send inappropriate messages to his contacts. |
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| 32. |
Applying the distributive law to the expression A(B+̅+D), we get…………..A. AB+AC+AD B. ABD C. A+B+C+D D. AB+A̅+AD |
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Answer» Correct option is: D. AB+A̅+AD |
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| 33. |
Explain Proprietary Software and open source software. Give examples. |
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Answer» (i) Proprietary software The proprietary software is a kind of software for which ownership remains with the creator under the provisions of copyright. The owner or proprietor provides license to the user, for using its applications on certain terms and conditions. Users are not being given the right to open, modify or further distribute the source code of such software. Because of this, the software of this category is being called closed source software also. The owner of the software takes fees for granting the license for using its applications, sometimes, some of the software may be free from charges for using its applications but the source code of the software remains closed. The proprietary software is most of the times a paid software but sometimes it can be made available free of cost, on the basis of some terms and conditions decided by the owner whereas. Whether such software are being purchased or made available free of cost, but the source code of such software remains closed. We have a number of Library automation software in this category. For example, LIBSYS, VIRTUA, TRUDAN, etc. (ii) Open Source Software The Open Source Software (OSS) is a software for which source code is open. The users are granted license to use, study, modify and further redistribute it. Such software is usually the product of collective efforts of the professionals to provide free and also the right of customization as per need of the user. There are a number of open source Library automation software available and being used worldwide. For example, KOHA, New Gen Lib, ABCD, etc, are a few open source LAS available worldwide. Here, we are going to discuss KOHA, which is one of the popular and worldwide used open source LAS. |
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| 34. |
A 175. इंनमें कौन से रस्युग्म हैं जो महाकाव्य के प्रधान रस RAV SIRमानें हैं।(b) वीर - भयानक(a) शृंगार(d) हास्य - वात्सल्य(c) करुण - रोद्रि |
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Answer» Answer: (a) शृंगार |
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| 35. |
काल पहचानो प्रश्नfor revision of examCLASS 8 |
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Answer» sorry bro I don't know answer भूतकाल के कुल भेद होते हैं – (A) चार (B) पाँच (C) छह (D) सात → ‘राम अभी आया है।’ वाक्य में क्रिया किस काल की है ? (A) सामान्य भूतकाल (B) आसन्न भूतकाल (C) पूर्ण भूतकाल (D) अपूर्ण भूतकाल → ‘वह पढ़ता तो उत्तीर्ण हो जाता।’ वाक्य किस काल का है ? (A) पूर्ण भूतकाल (B) अपूर्ण भूतकाल (C) संदिग्ध भूतकाल (D) हेतुहेतुमद् भूतकाल → ‘लगता हे, वह चला जाएगा।’ वाक्य किस काल का है ? (A) सामान्य भविष्यत् काल (B) सम्भाव्य भविष्यत् काल (C) हेतुहेतुमद् भविष्यत् काल (D) संदिग्ध भूतकाल → ‘मैं पुस्तक पढूँगा।’ वाकय किस काल का है ? (A) सामान्य भविष्यत् काल (B) सम्भाव्य भविष्यत् काल (C) हेतुहेतुमद् भविष्यत् काल (D) संदिग्ध भूतकाल → काल के कुल भेद होते है – (A) तीन
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| 36. |
Computer science |
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Answer» Computer Science is the study of computers and computational systems. Computer scientists design and analyze algorithms to solve programs and study the performance of computer hardware and software. |
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| 37. |
What is Computer Science? |
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Answer» Computer Science is the study of computers and computational systems. Unlike electrical and computer engineers, computer scientists deal mostly with software and software systems; this includes their theory, design, development, and application. Principal areas of study within Computer Science include artificial intelligence, computer systems and networks, security, database systems, human computer interaction, vision and graphics, numerical analysis, programming languages, software engineering, bioinformatics and theory of computing. |
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| 38. |
traditional methods of document preparation |
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Answer» The process of producing documents is an iterative process involving drafting, checking, and revising the document. It should continue until a document of acceptable quality is produced. The acceptable quality level depends on the document type and the potential readers of the document. |
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| 39. |
What is a solid state drive? |
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Answer» Solid state drives use flash memory to deliver superior performance and durability. Because there are lots of small, moving parts inside your hard drive — magnetic heads, spindles, and spinning platters — it's easy for things to go wrong and you could lose your important data. Without moving parts, SSDs are more durable, run cooler and use less energy.. |
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| 40. |
With help of suitable examples differentiate between system software and application software |
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Answer» System Software is the type of software that is the interface between application software and system. Low-level languages are used to write the system software. System Software maintains the system resources and gives the path for application software to run. An important thing is that without system software, the system can not run. It is a general-purpose software. Application Software is the type of software that runs as per user request. It runs on the platform which is provided by system software. High-level languages are used to write the application software. It’s a specific purpose software. The main difference between System Software and Application Software is that without system software, the system can not run on the other hand without application software, the Low-level maintainssystem always runs. |
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| 41. |
A grain merchant sold 600 quintals of rice at a profit of 7 %. If a quintal of rice costs him Rs. 1600, Then find his total profit of merchant.1. Rs. 77,202. Rs. 57,2003. Rs. 62,2004. Rs. 67,200 |
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Answer» Correct Answer - Option 4 : Rs. 67,200 Given A grain merchant sold 600 quintals of rice At a profit of 7 % A quintal of rice costs him Rs. 1600 Concept Profit% = (Profit/Cost Price) × 100 Profit percent on one kilogram is always equal to profit percent on whole. Calculation Cost price of one quintal = Rs. 1600 ⇒ Profit = (7% × 1600) ⇒ Profit = (7/100) × 1600 ⇒ Profit = Rs. 112 ⇒ Profit on one quintal rice = Rs. 112 ⇒ Profit on 600 quintal rice = 112 × 600 ⇒ Profit on 600 quintal rice = 67200 ∴ Total profit of merchant = Rs. 67,200 |
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| 42. |
Hundreds of people _____ for the jobs. A) have been applied B) have applied C) have applying D) was applied |
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Answer» Correct option is B) have applied |
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| 43. |
Write an e-mail to a charitable trust requesting for a scholarship. |
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Answer» From: [email protected] Sub: Seeking scholarship Dear Sir, I am Ritika about to complete my Std XI in Government Higher Secondary School, Nandhivaran. My father, the only bread winner, got hurt in an accident. He was working in a private firm. My mom is a home maker. I am at cross roads now. My mom has taken my dad to Nagerkoil. I need to stay in a ladies’s hostel to continue my studies. Could you please consider my request favourably and release a scholarship till I complete my XII public exam – successfully. I hope to avail a Bank loan after I get my results. Awaiting your favourable reply, Yours sincerely, S. Ritika XI-BGGHSS, Nandhivaran Kanchipuram Dt. |
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| 44. |
What has been the policy of the Indians in all spheres of life? |
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Answer» "Live and let live" has been the policy of the Indians in all spheres of life. |
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| 45. |
He _____ to a senior designer. A) has been promoted B) has promoted C) promoted D) are promoted |
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Answer» Correct option is A) has been promoted |
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| 46. |
________ English? A) How long time are you studying B) How long do you study C) How long have you been studying D) How long time have you studied |
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Answer» Correct option is C) How long have you been studying |
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| 47. |
The little boy keeps the insect in a ________ . A) match box B) box of matches C) box of the matches D) box match |
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Answer» Correct option is A) match box |
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| 48. |
She’s going to the photographer’s ________ . A) to take her photograph B) to have taken her photograph C) to have her photograph D) that he takes her photograph |
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Answer» Correct option is C) to have her photograph |
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| 49. |
She’s going _____ home. A) to walk B) walking C) walk D) to walking |
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Answer» Correct option is A) to walk |
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| 50. |
A food stall owner sold some burgers in such a way that selling price of 100 burgers is the same as the cost price of 105 burgers. So the percentage of gain or loss is:1. 20%2. 7%3. 10%4. 5% |
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Answer» Correct Answer - Option 4 : 5% Given: SP of 100 burgers = CP of 105 burgers Formula used: P = S.P. – C.P. L = C.P. – S.P. P% = (P/C.P.) × 100 L% = (L/C.P.) × 100 Where, P → Profit L → Loss SP → Selling price CP → Cost price Calculations: Let the CP of 1 burger be Rs.y and its SP be Rs.x. So the SP of 100 burgers = 100x And the CP of 105 burgers = 105y According to the question, 100x = 105y ⇒ x ∶ y = 21 ∶ 20 Now let x and y be 21k and 20k respectively. Since x > y So P = 21k – 20k = k P% = (P/CP) × 100 ⇒ P% = (k/20k) × 100 = 5% ∴ The required Profit% is 5%. |
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