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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. |
The following figure represents which hand molding equipment?(a) Gate cutter(b) Draw spike(c) Swab(d) Hand riddle |
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Answer» Correct option is (a) Gate cutter To explain: In the given figure of the hand molding equipment which is shown is a gate cutter. A gate cutter is basically a sheet metal which is given a definite shape, so as to be able to perform proper cutting operations. |
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| 2. |
How many types of pavement surfaces are there?(a) 4(b) 5(c) 6(d) 2 |
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Answer» The correct option is (d) 2 Easiest explanation: The 2 types are Portland cement concrete (PCC) and hot-mix asphalt (HMA). Weathering courses, base course is laid below these. |
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| 3. |
What is the unit of catalytic efficiency kcat/Km?(a) conc^-1 time^-1(b) conc time(c) conc^-2time^-2(d) conc time-1 |
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Answer» The correct choice is (a) conc^-1 time^-1 For explanation I would say: When calculating Kcat, the concentration units cancel out, so Kcat is expressed in units of inverse time. It is the turnover number – the number of substrate molecule each enzyme site converts to product per unit time. The units of Km are those of concentration i.e. mM, mM or Km is the concentration of substrate at which half maximal velocity is observed. |
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| 4. |
The amount of urine formed by an average kidney in one day is ________(a) 10-10.5 L(b) 10-15 ml(c) 1-1.5 L(d) 5 L |
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Answer» The correct answer is (c) 1-1.5 L To explain: The amount of urine formed by an average kidney in one day is 1-1.5 L. The total amount of glomerular filtrate is about 180 litres per day. Very large amounts of water and other substances are re-absorbed by the kidney tubules. |
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| 5. |
The term ___________ is used when referring to the frequency content of a signal.(a) angular momentum(b) spectrum(c) scope(d) bandwidth |
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Answer» Correct answer is (b) spectrum Explanation: The term spectrum is used when referring to the frequency content of a signal. The basic motivation for developing frequency analysis tools is to provide a mathematical and pictorial representation for the frequency components that are contained in any given signal. Most biomedical signals of practical interest can be decomposed into a sum of sinusoidal signal components. |
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| 6. |
Permeability of molding sand does not depend on which of the following factors?(a) Grain distribution(b) Degree of ramming(c) Binder contents(d) Amount of wax present |
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Answer» Right choice is (d) Amount of wax present Explanation: Permeability of molding sand allows the hot gases and steams to escape out. This property does not depend on the amount of wax present. |
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| 7. |
Water content is given by:(a) Weight of water/mass of soil(b) Mass of water/mass of solid(c) Mass of water/mass of soil(d) Mass of water/weight of solid |
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Answer» The correct answer is (b) Mass of water/mass of solid The best explanation: In Geotechnical Engineering, water content is an important parameter for analysing the soil. It is expressed as mass of water divided by mass of solids. It is denoted by w and expressed in %. |
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| 8. |
Porosity and void ratio are related by:(a) e = ^n⁄(1-n)(b) n = ^e⁄(1-e)(c) 1-e = n(d) ^(1+n)⁄n = e-1 |
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Answer» Right answer is (a) e = ^n⁄(1-n) For explanation I would say: Void ratio is e and porosity is n. Another relationship between the two is n = ^e⁄(1+e) |
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| 9. |
Which colour is given for surfaces, yet to be machined in cast surface?(a) Red(b) Black(c) Yellow(d) No colour |
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Answer» The correct option is (a) Red For explanation I would say: Provision of colour scheme makes it easy for one to detect the part and the operation to be performed on it. According to the American pattern colour scheme, red colour is to be given for casting surfaces yet to be machined. |
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| 10. |
At what temperature does the clay dead burning take place?(a) 400°C – 500°C(b) 500°C – 600°C(c) 600°C – 700°C(d) 700°C – 800°C |
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Answer» Correct answer is (b) 500°C – 600°C To elaborate: Clay dead burning is a process that needs to be taken place at a comparatively higher temperature. The temperature at which the clay dead burning takes place is somewhere in between 500°C and 600°C. |
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| 11. |
Which of the following does not happen when compaction is done?(a) Permeability decreases(b) Water content increases(c) Shear strength decreases(d) Compressibility decreases |
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Answer» The correct answer is (c) Shear strength decreases Easy explanation: On compaction of a soil mass, the shear strength is increased. It is tightly and firmly compacted and offers resistance to deformation and flow. |
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| 12. |
Potassium hydroxide boils at what temperature?(a) 1260°C(b) 1320°C(c) 1840°C(d) 2560°C |
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Answer» Right option is (b) 1320°C Explanation: None. |
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| 13. |
What is the amount of clay content in Loam sand?(a) 30%(b) 40%(c) 50%(d) 60% |
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Answer» The correct answer is (c) 50% The best I can explain: Clay content in loam sand is relatively more than that of in natural sand. Also, the amount of humid content or the levels of water too in loam sand would be differing similarly. The clay content in loam sand is around 50%. |
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| 14. |
In the given below figure of Mechanism of vacuum generation, point ‘2’ is the indication of _____(a) Poynting point(b) Vena contracta(c) Stack point(d) Steric point |
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Answer» Correct answer is (b) Vena contracta For explanation I would say: The constricted region at point 2 in the figure is known as vena contracta. A sudden change in the flow direction cause the aspiration effect and thus vacuum as the liquid metal stream contracts around a sharp corner due to the momentum effect. To avoid vacuum, the mould is made to fit the vena contracta. |
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| 15. |
A general loam sand mixture contains how many volumes of silica?(a) 10(b) 20(c) 30(d) 40 |
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Answer» Correct choice is (b) 20 Best explanation: In general loam sand, the moisture is found to contain a decently good amount of clay content in it. A general loam sand mixture contains 20 volumes of silica, the moisture of 20% and manure 1 volume. |
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| 16. |
For a smooth conduit, which of the following is the value of friction factor (f) for laminar and turbulent flow respectively?(a) 10/Re, 0.0791(Re)^-0.25(b) 16/Re, 0.0791(Re)^-0.25(c) 10/Re, 0.0771(Re)^-0.25(d) 16/Re, 0.0171(Re)^-0.25 |
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Answer» Correct choice is (b) 16/Re, 0.0791(Re)^-0.25 The explanation: For a smooth conduit, the value of f is given by the equations f = 16/Re for laminar flow (Re < 2000), f = 0.0791(Re)^-0.25 for turbulent flow (Re > 2000), Where, Re is Reynolds number. |
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| 17. |
Debarking is done so as to:(a) Safeguard saws(b) Improve seasoning(c) Expose surface of wood(d) Reduce weight |
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Answer» Right choice is (a) Safeguard saws The best I can explain: Debarking is now being adopted widely. It safeguards saws and equipment from damage that would otherwise result from stones, metals, etc. present in the bark. |
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| 18. |
In the given figure of Entry with rounded corner type of changes in flow geometry, the value of friction loss factor (eғ) is_____(a) 0.33eғs(b) 0.5eғs(c) 2eғs(d) eғs |
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Answer» Right answer is (a) 0.33eғs The best explanation: eғ = 0.33 eғs, where eғ is the friction loss factor. The value of eғ depends on whether the flow is enlarging or contracting in the direction of flow. And eғs refers to the value corresponding to a sharp change of geometry with identical initial and final dimensions. |
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| 19. |
Which of the following will not affect insulation?(a) Charcoal(b) Graphite(c) Copper(d) Out hulls |
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Answer» The correct option is (c) Copper The explanation is: When there is an addition of a powdered form of charcoal, graphite or out hulls, there is an insulation effect in the riser, but not by the addition of copper. |
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| 20. |
What is the green compression strength of light to medium size malleable iron castings?(a) 0.05 kg/cm^2(b) 0.06 kg/cm^2(c) 0.07 kg/cm^2(d) 0.08 kg/cm^2 |
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Answer» The correct choice is (d) 0.08 kg/cm^2 Easiest explanation: The green compression strength of light to medium size malleable iron casts is 0.08 kg/cm^2, whereas the dry compression strength of a core sand mixture is found to be 70 kg/cm^2. |
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| 21. |
Which of the following plot has the difficulty of extrapolating vmax?(a) Line-weaver burk plot(b) Eadie-Hofstee plot(c) Michaelis-menten plot(d) Langmuir plot |
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Answer» Correct option is (c) Michaelis-menten plot Easiest explanation: This simple procedure involves plotting (v, s) values directly vmax is the rate as s→∞ and Km is the value of s at v = vmax/2. The accuracy of this method is usually poor because of the difficulty of extrapolating to vmax. |
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| 22. |
What is the amount of green permeability in light to medium size malleable iron castings?(a) 34 cc/min(b) 44 cc/min(c) 54 cc/min(d) 64 cc/min |
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Answer» Correct option is (b) 44 cc/min The best explanation: The rate of green permeability is quite a decent one. The amount of green permeability in light to medium size malleable iron castings is 44 cc/min. |
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| 23. |
What is the water content in light to medium size malleable iron castings?(a) 3.2%(b) 4.2%(c) 5.2%(d) 6.2% |
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Answer» The correct option is (b) 4.2% The best I can explain: The water content in terms of percentage composition in light to medium size malleable iron castings is calculated to be not much in it. The amount of water content found in the casting is about 4.2%. |
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| 24. |
In gray iron castings of facing sand mixtures, what is the bentonite percentage composition?(a) 2-3%(b) 3-4%(c) 4-5%(d) 5-6% |
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Answer» Correct answer is (a) 2-3% The explanation is: In gray cast irons of facing sand mixtures, the bentonite percentage composition is calculated to be 2-3%. Whereas, in the case of green sands, the bentonite percentage is recorded to be around 3.5%. |
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| 25. |
To join pieces of timber in width and thickness is called?(a) Pattern filling(b) Mortising(c) Building-up(d) Brazing |
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Answer» Correct choice is (c) Building-up The explanation: The process of joining pieces of timber in width and thickness is called as building-up. A mortise is a wood working machine, used for mortising tenon joints and brazing is used in welding. |
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| 26. |
Which of the following shows the relationship between the growth rate and inter-phase spacing?(a) λ^2R = constant(b) λR^2 = constant(c) λ/R = constant(d) λ⁴R = constant |
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Answer» Correct choice is (a) λ^2R = constant The best I can explain: The relationship between the growth rate (R) and inter-phase spacing (λ) for the eutectic structure is given by: λ^2R = constant, where the constant is related to the magnitudes of the liquid-us slopes at the eutectic temperature and the composition difference between the two phases. |
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| 27. |
The energy loss due to friction (Ef) in a circular conduit (on the basis of per unit mass) is given by_____(a) Ef = 4fLv̅²/2D(b) Ef = 8fLv̅²/2D(c) Ef = 4fLv̅³/2D(d) Ef = 4fLv̅²/D |
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Answer» The correct answer is (a) Ef = 4fLv̅²/2D For explanation I would say: Ef = 4fLv̅²/2D is the energy loss due to friction in a circular conduit. The frictional losses are present due to sudden contraction or enlargement of the flow cross-sections. Where, v̅ = Average velocity, D = Diameter of the conduit, L = Length of the conduit and f = friction factor. |
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| 28. |
How high can solidification rate factor be increased by metal chills?(a) 12(b) 13(c) 14(d) 15 |
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Answer» Right choice is (c) 14 Easy explanation: The solidification rate can be increased by a factor as high as 14, relative to that which is obtained in sand molds, by metal chills. |
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| 29. |
Starvation proteins are produced by a culture during which of the following segments of growth curve?(a) Lag phase(b) Log phase(c) Stationary phase(d) Death phase |
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Answer» The correct choice is (c) Stationary phase To explain: When microbes lack the nutrients necessary for growth, they enter stationary phase. In cases when energy sources are still present in the environment, they must decide whether to continue to use their metabolic program to harvest the available energy. Here we characterized the metabolic response to a variety of types of nutrient starvation in Escherichia coli and Bacillus subtilis. |
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| 30. |
How much blood is present in an average adult?(a) 10-12 L(b) 2-3 L(c) 5-6 L(d) 20-25 L |
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Answer» The correct choice is (c) 5-6 L To explain: In an average adult about 5-6 L of blood is present. Blood consists of corpuscles suspended in a fluid called plasma in the proportion of 45 parts of corpuscles (cells) to 55 parts of plasma. The percentage of cells in the blood is called the haematocrit value or packed cell volume (PCV). |
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| 31. |
The reflected light from the skin at wavelengths of 665nm(red) and 935nm(infrared) is detected by ______________(a) Photo diode(b) Laser diode(c) Silicon diode(d) Zener diode |
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Answer» Correct answer is (c) Silicon diode For explanation I would say: A pair of red and infrared light emitting diodes are used for the light source, with peak emission wavelengths of 665 nm (red) and 935 nm (infrared). The reflected light from the skin at these two wavelengths is detected by a silicon diode. |
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| 32. |
In a moisture content test, for how long should the sand in infrared heating bulb be heated?(a) 1 – 2 minutes(b) 2 – 3 minutes(c) 3 – 4 minutes(d) 4 – 5 minutes |
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Answer» Correct option is (b) 2 – 3 minutes The best explanation: The moisture content tests are highly performed in a heating bulb. About 20 to 50 grams of the prepared sand is heated using infrared heating for 2 to 3 minutes in the infrared heating bulb. |
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| 33. |
In a moisture content test, how is the prepared sand heated?(a) Flame heating(b) Ultraviolet heating(c) Infrared heating(d) Conduction heating |
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Answer» Right option is (c) Infrared heating Best explanation: In a moisture content test, the prepared sand is taken in a pan, about 20 to 50 grams, and then heated using infrared heating. |
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| 34. |
The distribution coefficient is accurate only if?(a) Solvents are miscible(b) Solutes are miscible(c) Solvents are immiscible(d) Occurrence of chemical reaction |
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Answer» The correct choice is (c) Solvents are immiscible Best explanation: Equilibrium distribution of one solute between two phases is conveniently described in terms of the distribution law. At equilibrium, the ratio of solute concentrations in the two phases is given by the distribution coefficient or partition coefficient, m. The distribution law is accurate only if both solvents are immiscible and there is no chemical reaction. |
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| 35. |
Which of the following gates is used for making stove plate castings?(a) Edge gate(b) Wedge gate(c) Ring gate(d) Finger gate |
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Answer» Right choice is (b) Wedge gate Easy explanation: Among the following, edge gate, ring gate and finger gate, are not used for the making of stove plate castings. A wedge gate is used when a stove plate casting has to be made. |
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| 36. |
Which of the following gates is not favourble for non ferrous castings?(a) Top gate(b) Bottom gate(c) Parting gate(d) Middle gate |
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Answer» Right option is (a) Top gate The best I can explain: When a non ferrous casting is made to drop from the top gate, there is a tendency of it to form dross. Hence, top gates are not favourable for non ferrous castings. |
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| 37. |
Why large or complex castings require multiple in-gates?(a) To make smooth surface finish of the casting(b) To make uniform flow(c) To have high strength of the casting(d) To have good toughness of the casting |
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Answer» Correct answer is (b) To make uniform flow To explain: Large or complex castings require multiple in-gates to completely fill all the sections of the castings effectively. Runner area is also reduced after each in-gate, such that restriction on the metal flow would be provided to make more uniformity in the metal flow. |
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| 38. |
Which components of cell help in the manufacturing of new biological products?(a) Carbohydrates(b) Proteins(c) Lipids(d) Nucleic acids |
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Answer» The correct answer is (b) Proteins The best explanation: Proteins such as enzymes play a very important role in the manufacturing of biological products, they provide the quality and stability with increased product efficiency and reducing consumption in energy, water and raw materials – and generating less waste. |
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| 39. |
According to the Balances on steady-state processes, the accumulation is equal to?(a) 1(b) 0(c) 100(d) 2 |
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Answer» Correct answer is (b) 0 Easy explanation: The process is said to be operating at steady-state when all process variables do not change with time. The accumulation term in a balance must equal to zero to ensure that the amount/mass of material in the process do not change with time. Steady state means accumulation = 0 Input + generation – output – consumption = 0 Input + generation = output + consumption. |
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| 40. |
Processes for phase change of vapour to liquid is called?(a) Vaporization(b) Fusion(c) Sublimation(d) Condensation |
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Answer» The correct option is (d) Condensation The best explanation: Condensation is the change of the physical state of matter from gas phase into liquid phase, and is the reverse of evaporation. |
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| 41. |
From the following type of processes, which type depends on the steady-state condition?(a) Batch process(b) Fed-Batch process(c) Semi-Batch process(d) Continuous process |
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Answer» The correct answer is (d) Continuous process The explanation is: If all properties of a system, such as temperature, pressure, concentration, volume, mass, etc. do not vary with time, the process is said to be at steady state. Continuous processes may be either steady state or transient. It is usual to run continuous processes as close to steady state as possible; however, unsteady-state conditions will exist during start-up and for some time after any change in operating conditions. |
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| 42. |
The degree or intensity of ramming _________(a) Increases bulk density(b) Decreases bulk density(c) Does not change bulk density(d) Can increase as well as decrease bulk density |
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Answer» The correct option is (a) Increases bulk density The explanation: The increased degree of ramming results in an increase of bulk density or hardness of sand. |
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| 43. |
Temperature and humidity should be _________(a) Very low(b) Very high(c) Be controlled accordingly(d) Is not a matter of concern |
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Answer» Right answer is (c) Be controlled accordingly The best explanation: Neither too high nor too low temp is required but it is a factor to be controlled as to avoid pattern rusting or warping. |
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| 44. |
A substance of mass M kg requires a power input of P wants to remain in the molten state at its melting point. When the power source is turned off, the sample completely solidifies in time t seconds. The latent heat of fusion of the substance is …….A. `(Pt)/(piM)`B. `(2pt)/(piM)`C. `(pt)/(M)`D. `(pt)/(2M)` |
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Answer» pt=heat lost in time t=mL `L=(pt)/(M)` |
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| 45. |
Calculate the number of plates in the multi plate capacitor having C=1.77*10^-10F relative permittivity=5, A=4m^2 and d=2m.(a) 1(b) 2(c) 3(d) 4 |
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Answer» Correct choice is (c) 3 Easy explanation: The formula for capacitance of a multi plate capacitor: C=Relative permittivity*absolute permittivity*(n-1)*A/d. Substituting the given values in the equation, we get n=3. |
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| 46. |
A cubical box of side `1 m` contains an ideal gas ata pressure `100 N//m^(2)`. If `Sigmav_(x)^(2) = Sigmav_(y)^(2) = Sigmav_(z)^(2) = 10^(28) m^(2)//s^(2)`, where `v_(x), v_(y)` and `v_(z)` are the x, y and z components, respectively, of the gas molecule, then the mass of each gas molecule isA. `10^(-20) g`B. `10^(-23) g`C. `10^(-18) g`D. `10^(-26) g` |
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Answer» Correct Answer - B `PV=mSigmav_(x)^(2)` `rArr m = (100xx1)/(10^(28))=10^(-26) Kg = 10^(-23)g` |
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| 47. |
If 5 m^3 of certain oil weighs 45 kN calculate the specific weight of the oil.(a) 10 kN/m^3(b) 9 kN/m^3(c) 5 kN/m^3(d) 2 kN/m^3 |
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Answer» The correct choice is (b) 9 kN/m^3 For explanation I would say: Given data: Volume = 5 m^3 Weight = 45 kN |
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| 48. |
A body is projected at an angle `60^(@)` with the horizontal ground with kinetic energy k. When the velocity makes an angle `30^(@)` with the horizontal, the kinetic energy of the body will be `(k)/(a)`. Find value of a. |
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Answer» Correct Answer - 4 m/s `v_(B//C)implies v_(B//G)-v_(C//G)implies(5+2)-3implies +4m//s` |
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| 49. |
Two fixed insulating rings A and B carry ahanges with uniform linear aharge density `+lambda` and `-lambda`, respectively, as shown in the adjacent figure. The planes of the rings are parallel to each other and their axes are coinciding. A particle of change "q" and mass "m" is released with zero velocity from centre P of the positively charged ring. The kinetic energy of the particle when it reaches centre Q of the negatively charge ring will be A. `sqrt((2lambdaq)/(m in_(0))(1 - (1)/(sqrt2))`B. `(lambda)/(in_(0))(1 - (1)/(sqrt2))q`C. `(lambda)/(2 in_(0))(1 - (1)/(sqrt2))q`D. none of these |
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Answer» Correct Answer - B Potential at P due to rings `V_(P)=(lambda2piR)/(4piin_(0)R)-(lambda2piR)/(4piin_(0)sqrt2R)=(lambda)/(2in_(0))(1-(1)/(sqrt2))` Potential at Q due to rings is `V_(Q)=-(lambda)/(2in_(0))(1-(1)/(sqrt2))` `Delta(K.E.)+(V_(Q)-V_(P))q=0` `rArr (1)/(2)mv^(2)=(lambda)/(in_(0))(1-(1)/(sqrt2))q` |
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| 50. |
Magnetic field in the cylindrical regaion with its axis passing through O varies at a constant rate `(dB)/(dt)`. A treangular imaginary loop ABC, with `AB = BC`, is lying in this region as shown in the adjacent figure. The work done to move unit positive charge from A to B along the side AB is A. `r^(2)(dB)/(dt)`B. `pir^(2)(dB)/(dt)`C. `(r^(2))/(2)(dB)/(dt)`D. `(3r^(2))/(4)(dB)/(dt)` |
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Answer» Correct Answer - C No e.m.f. will be induced in AC because electric lines of force are perpendicular to AC and e.m.f. induced in `AB=` e.m.f. induced in BC. `:.` e.m.f. induced in `AB=(1)/(2)|(dphi)/(dt)|=(1)/(2)r^(2)(dB)/(dt)` |
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