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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. |
What do you understand by sustainable development? |
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Answer» Sustainable means what is good for the economy as well as the future of the environment. |
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| 2. |
Name any two values of an entrepreneur. |
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Answer» a) Confidence b) Independence c) Perseverance d) Open-mindedness |
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| 3. |
Write full form of NAPCC. |
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Answer» National Action Plan on Climate Change |
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| 4. |
With the advancement in technology we have also encountered the problem of ____________ |
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Answer» With the advancement in technology we have also encountered the problem of e-waste. |
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| 5. |
The advancement in technology has made us face a new challenge of waste management. Explain briefly. |
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Answer» 1. The rapid expansion of technology and the consumption driven society results in the creation of a very large amount of e-waste. 2. E-waste contains a list of chemicals that are harmful to people and the environment, like: mercury, lead, beryllium, brominated flame retardants, and cadmium. When electronics are mishandled during disposal, these chemicals end up in our soil, water, and air. |
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| 6. |
State the purpose of reducing the switching functions to the minimal form? |
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Answer» The switching functions are practically implemented in the form of gates. A minimized Boolean expression means less number of gates which means simplified circuitary. Thus, the purpose of reducing the switching functions to the minimal form is getting circuitary. |
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| 7. |
A car is acclerating down on an inclined plane as shown in the figure with acceleration a=g. Now find time period of SHM of the pendulum present inside the car. A. `T=spisqrt((l)/(g))`B. `T=2pisqrt((l)/(g cos 30^(@)))`C. `T=2pisqrt((l)/(gsqrt(2)))`D. `T=2pisqrt((l cos 60^(@)))/(g)` |
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Answer» `g_(l)=("Tension")/(m)` `=sqrt(((mg)^(2)+(mg)^(2)+2(mg)(mg)sin20^(@))/(m))` `g_(l)=g` `T=2pisqrt((l)/(g))` |
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| 8. |
Consider three boxes, each containing 10balls labelled 1, 2, ...., 10. Suppose one ball is randomly drawn from each of the boxes. Denote by n1, the label of the ball drawn from the ith box, (i = 1, 2, 3). Then, the number of ways in which the balls can be chosen such that n1 < n2 < n3 is : (1) 82 (2) 240 (3) 120 (4) 164 |
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Answer» The correct option (3) 120 Explanation: Total number of ways = 10C3 = (10.9.8)/6 = 120 |
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| 9. |
Which of the following statements regarding the physical adsorption of a gas on surface of solid is not correct?(a) On increasing temperature, adsorption increases continuously(b) Enthalpy changes are negative(c) Adsorption is specific(d) It is reversible in nature |
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Answer» The correct answer is (a) On increasing temperature, adsorption increases continuously To explain I would say: Physisorption is exothermic in nature. Therefore according to le chateliars principle, it occurs readily at low temperature and decreases with increase in temperature. Bond between adsorbent i.e. surface and adsorbate like gases are weak so when temperature is increasing the bond get break easily and adsorption of adsorbate get stop so rate will decrease on increasing temperature. |
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| 10. |
Which of the following is the example of Reflexivity equivalence relation?(a) A ∼ A(b) A ∼ B(c) A ∼ C(d) C ∼ B |
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Answer» Right choice is (a) A ∼ A Explanation: The equivalence relation is of reflexivity as an example of a reflexive relation is the relation “is equal to” on the set of real numbers since every real number is equal to itself. A reflexive relation is said to have the reflexive property or is said to possess reflexivity. Along with symmetry and transitivity, reflexivity is one of three properties defining equivalence relations. |
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| 11. |
What is the degree of reduction of glucose?(a) 4(b) 3(c) 12(d) 24 |
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Answer» The correct option is (d) 24 Easiest explanation: Glucose is C6H12O6. The degree of reduction = 6 x (+4) + 12 x (+1) + 6 x (-2) = 24. |
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| 12. |
Which of the following represents the figure corresponding to the stream?(a) Recycle system(b) By-pass system(c) Purge system(d) Recover stream |
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Answer» The correct answer is (b) By-pass system To elaborate: A by-pass is one where a portion of the inlet to a process unit is split from the feed and instead of entering the process is combined with the outlet from that process. This practice is far less common than recycle, but may be used if your ultimate goal is a material with properties” in-between” the untreated reactant and the process outlet product. |
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| 13. |
Calculate the degree of reduction for ethanol, where the degree of reduction of C=4, H=1, O=-2.(a) γ = 9(b) γ = 6(c) γ = 3(d) γ = 2 |
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Answer» Correct option is (b) γ = 6 To elaborate: Ethanol (C2H5OH) = 2(4) + 6(1) + 1(-2) = 12, γ = 12/2 = 6 As, the number of equivalents of available electrons per gram atom C is the measure of degree of reduction. |
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| 14. |
Which type of isotherm is given from the figure, Choose from the following options?(a) Type 1 Adsorption isotherm(b) Type 2 Adsorption isotherm(c) Type 3 Adsorption isotherm(d) Type 4 Adsorption isotherm |
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Answer» The correct option is (a) Type 1 Adsorption isotherm To explain: The above graph depicts Monolayer adsorption. This graph can be easily explained using Langmuir Adsorption Isotherm. Examples of Type-I adsorption are Adsorption of Nitrogen (N2) or Hydrogen (H) on charcoal at temperature near to -1800C. |
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| 15. |
Which of the following system follows the differential equation?(a) Semi- Batch process(b) Batch process(c) Fed- Batch process(d) Continuous process |
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Answer» The correct choice is (d) Continuous process Explanation: Amounts of mass entering and leaving the system are specified using flow rates, a mass balance based on rates is called a differential balance. Whereas, each term of the mass-balance equation in this case is a quantity of mass, not a rate. This type of balance is called an integral balance. Differential balances for continuous systems operating at steady state and integral balances for batch and semi-batch systems between initial and final states are used. |
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| 16. |
Adsorption of methane follows the Langmuir adsorption isotherm at 90K. If p = 1.896cm^3g^-1bar^-1 and b = 0.146bar^-1. Calculate the value of θ.(a) 0.116 bar(b) 0.514 bar(c) 0.214 bar(d) 0.216 bar |
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Answer» Correct option is (d) 0.216 bar Best explanation: Given data p = 1.896cm^3g^-1 bar^-1 b = 0.146 bar^-1 Substitute in the corresponding equation |
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| 17. |
Which type of process is involved to produce Crystalline Potassium Penicillin?(a) Evaporation(b) Annealing(c) Decomposition(d) Precipitation |
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Answer» The correct option is (d) Precipitation For explanation I would say: Potassium ions are added to precipitate salt of Penicillin, so as to get its pure form in the later stage and the process involved in this is salting out technique which also results in less loss of Penicillin during fermentation process. |
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| 18. |
For an adsorbant-adsorbate system obeying the Langmuir adsorption isotherm, b = 0.48 bar^-1 and p = 0.16 bar^-1. At what pressure will 50% of the surface be covered?(a) 0.05 bar(b) 0.07 bar(c) 0.08 bar(d) 0.04 bar |
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Answer» Correct option is (b) 0.07 bar The explanation is: Given data b = 0.48 bar^-1 p = 0.16 bar^-1 Substitute in the corresponding equation |
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| 19. |
Which type of fermentation was used by Engineers to produce penicillin on large scale during World War 2?(a) Semi-Solid Fermentation(b) Deep-Tank Fermentation(c) Biphasic Fermentation(d) Solid-State Fermentation |
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Answer» The correct choice is (b) Deep-Tank Fermentation For explanation I would say: The Deep-Tank Batch Fermentation in which there is the application of submerged culture technique which was able to produce Penicillin of Approximately 50mg/ml which grew on large scale during World War 2. |
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| 20. |
In the fluid, when the flow velocity is constant at each point over time. Which term is applicable over this condition?(a) Thermodynamic equilibrium(b) Osmotic equilibrium(c) Hydrostatic equilibrium(d) Water pressure equilibrium |
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Answer» The correct option is (c) Hydrostatic equilibrium Explanation: In fluid mechanics, a fluid is said to be in hydrostatic equilibrium or hydrostatic balance when it is at rest, or when the flow velocity at each point is constant over time. This occurs when external forces such as gravity are balanced by a pressure gradient force. |
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| 21. |
In below mentioned options which one defines correctly the semi-log graph?(a) 10-cycle semi-logarithmic paper(b) 6- cycle semi-logarithmic paper(c) 2- cycle semi-logarithmic paper(d) 1- cycle semi logarithmic paper |
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Answer» Correct option is (d) 1- cycle semi logarithmic paper For explanation I would say: In one-cycle semi-logarithmic paper, the vertical scale goes from 1 to 10 and within the One order of magnitude (10^1) whereas, in others the magnitude varies like in 2 – cycle there is the magnitude of two i.e. (10^2) and likewise other options have different magnitudes according to their number of cycles. |
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| 22. |
A capillary tube is 30 mm long and 1 mm bore. The head required to produce a flow rate of 8 mm^3/s is 30 mm. The fluid density is 800 kg/m^3. Calculate the dynamic viscosity of the oil.(a) 20.1 cP(b) 24.1 cP(c) 20.0 cP(d) 24.0 cP |
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Answer» The correct choice is (b) 24.1 cP Easiest explanation: Rearranging Poiseuille’s equation we get |
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| 23. |
Which type of catalysis reaction defines cell growth?(a) Tandem catalysis(b) Surface catalysis(c) Homo catalysis(d) Autocatalysis |
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Answer» Correct option is (d) Autocatalysis For explanation I would say: Cell growth is an autocatalytic reaction: this means that the catalyst is a product of the reaction. The performance of catalytic reactions is characterized by variables such as the reaction rate and yield of product from substrate. In bioreactors, the growth is autocatalytic in that the more cells you have, the greater the growth rate. |
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| 24. |
Convert 35 K into °C.(a) 230.18(b) 238.15(c) -230.18(d) -238.15 |
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Answer» The correct option is (d) -238.15 Explanation: Convert degree Kelvin (K) into temperatures using this equation: T(°C) = T(K) – 273.15 = -238.15°C. |
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| 25. |
Which one of the following is not applicable to Coaxial cylinder?(a) Endomyces sp.(b) Streptomyces aureofaciens(c) Penicillium chrysogenum(d) Xanthomonas campestris |
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Answer» Right choice is (d) Xanthomonas campestris Explanation: Xanthomonas campestris has a Shear rate (s^-1) of 0.0035-100 and is a pseudoplastic, K increases continually; n levels off when xanthan concentration reaches 0.5%; cell mass (max 0.6%) has relatively little effect on viscosity. |
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| 26. |
Read the following table showing Endocrine glands, hormones they release and their functions.Now answer the following questions 1) What does the table show?2) Which gland stimulates glucose uptake in all cells?3) Which of the following glands stimulates heart rate and blood pressure?a) pituitary b) parathyroid c) adrenal4) Which of the following glands releases growth hormone?a) pancreas b) parathyroid c) pituitary5) Which of the following glands stimulates metabolism and heart rate ? a) pituitary b) thyroid c) adrenal |
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Answer» 1. The table shows endocrine glands, hormones they secrete and their functions. 2. Pancreas stimulates glucose uptake in all cells. 3. c) adrenal 4. c) pituitary 5. b) thyroid |
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| 27. |
Which condition is correct according to the growth of cells in beginning?(a) Cells are in small amount(b) Cells are in medium amount(c) Cells are in large amount(d) Cells are negligible in amount |
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Answer» Right option is (a) Cells are in small amount Easiest explanation: Growth always appears much slower at the beginning of culture because the number of cells present is small. |
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| 28. |
If the substrate is given in molar concentration how would you define it’s Molarity and Molality based on the temperature condition?(a) Molarity and Molality both will change on effect of temperature(b) Molarity will change but not Molality(c) Molality will change but not Molarity(d) Normality of the reaction will change |
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Answer» Right choice is (b) Molarity will change but not Molality The explanation: Molarity is the number of moles of solute per kilogram of the Solvent. That is because molarity does not depend on temperature, (neither on number of moles of solute nor mass of solvent will be affected by changes of temperature). While molarity changes as temperature changes because molarity is affected by temperature. This is because it is based on the volume of the solution, and the volume of a substance will be affected by changes in temperature. |
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| 29. |
Which of the following is not a core machine?(a) Jolt machine(b) Core blower(c) Sand slinger(d) Mill setter |
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Answer» The correct choice is (d) Mill setter For explanation I would say: Among the following, mill setter is not any type of a core machine, while the other three are few of the types of core machine. |
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| 30. |
Read the following table. The table below shows the estimated cost (in Rs. Lakhs) of a project of laying of a railway line between two places.Now answer the following questions. 1) What does the above table show?2) What is the total cost spent on laying the railway line?3) In which year very least total amount is spent?a) 1991 b) 1990 c) 19884) In which year maximum amount is spent?a) 1989 b) 1990 c) 19915) In which year the maximum amount is spent on Cement?a) 1988 b) 1989c) 1989 |
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Answer» 1. The table shows the estimated cuts of a project of laying a railway line between two places. 2. 705.3 lakh rupees. 3. c) 1988 4. a) 1989 5. b) 1989 |
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| 31. |
Which phase has the condition of specific growth rate “μ = 0”?(a) Lag phase(b) Log phase(c) Stationary phase(d) Death phase |
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Answer» Correct answer is (d) Death phase Best explanation: In death phase, the cells lose viability and lyse. Therefore, μ=0. |
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| 32. |
Study the following bar graph and answer the questions that follow.Now answer the following questions. 1) What does the above bar graph show?2) What is the maximum value of exports secured in all the five years?3) In which year the minimum value of exports secured?a) 1988 b) 1984 c) 19854) In which year the project exports declined by 33% when compared to the previous year?a) 1988 b) 1985 c) 19865} In which year the project exports rised to high extent? a) 1985 b) 1988 c) 1987 |
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Answer» 1. The above bar graph shows the project exports contracts secured by a company during the period 1984-88. 2. The maximum value of exports secured ip all the years is 143.9 crores in the year 1987. 3. a) 1988 4. b) 1985 5. c) 1987 |
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| 33. |
Refer to the below graph, determine the specific growth rate µ and the doubling time.(a) (0.118 hours, 5.9 hours)(b) (0.119 hours, 5.9 hours)(c) (0.151 hours, 5.9 hours)(d) (0.119 hours, 5.9 hours) |
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Answer» Correct option is (a) (0.118 hours, 5.9 hours) To explain: The regression results show that μ = 0.118 hr^-1. The doubling time, td = ln(2)/μ = 0.693/0.118 = 5.9 hrs. |
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| 34. |
Read the following passage. Penny-wise Monkey Once upon a time, there lived the king of a big and affluent country. The king was quite fond of travelling. Usually, he didn’t like to visit his own country; instead he went to other countries. One day, he assembled his army to move out for a holiday to some distant country. The king and his soldiers walked for the whole morning in the forest. After this, they went into the camp to take some rest. The horses were also tired, so they were fed with peas. One of the monkeys, who lived in the forest, was keeping a track of the things done by the king’s men from a distance. When he saw peas offered to the horses, he jumped down from the tree at once to get some of them. He quickly gobbled some peas, also filled his mouth and hands with them. Then, he went up the tree and sat down, to eat the peas. As and when, he sat there to eat peas; one pea fell from his hand to the ground. The greedy monkey dropped all the peas he had in his hands and ran down to look for the lost pea at once. Unluckily, he could not find that one pea. He climbed up the tree again and sat at rest. He was looking very sad. He said to himself, “To get one pea, I threw away what I had”. The king was watching the monkey from the camp and said to himself, “I would not be like this stupid monkey, who lost much to gain a little. I will go back to my own country and enjoy what I have”. Thus, the king and his army marched back to their own country. Now, answer the following questions. 1) Why did the king want to visit other countries?2) What did the monkey see?3) The monkey gobbled the peas in a particular way. From this, we know that …a) the monkey was kind b) the monkey was greedy c) the monkey wanted just enough to eat4) Another possible title to the story is ….. a) The Horses and the Monkey b) The Wise Monkey c) Penny-wise and Pound-foolishChoose the correct statement from the following.a) The king learnt that it is foolish to lose more to gain little. b) The king learnt that it is good to take risk in life.c) The king learnt that without pain there cannot be any gain. |
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Answer» 1. because he was quite fond of travelling. 2. The monkey saw peas being offered to the horses. 3. b) the monkey was greedy 4. c) Penny-wise and Pound-foolish 5. a) The king learnt that it is foolish to lose more to gain little. |
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| 35. |
What is the unit of specific growth rate?(a) g^-1(b) g/h(c) gl/h(d) h^-1 |
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Answer» Right option is (d) h^-1 Explanation: Specific growth rate = μ = (frac{1}{X} frac{dX}{dt}) where, X = cell mass concentration (g/L) t = time (h). |
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| 36. |
Find out the error(s) in the following design of a casting.(a) The vertical faces must be tapered ( provide draft allowance) only(b) The cavity must be created using some additional elements ( loose piece) only(c) The vertical faces must be tapered as well as the cavity must be created using loose piece(d) Nothing needs to be done ( no error) |
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Answer» The correct choice is (c) The vertical faces must be tapered as well as the cavity must be created using loose piece For explanation: Draft allowances well as loose piece needs to be provided to the pattern in order to maintain the quality of the casting. The corrected design is drawn below |
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| 37. |
Linear inhibition is sometimes called as ____________(a) Complete inhibition(b) Partial inhibition(c) Incomplete inhibition(d) Mixed inhibition |
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Answer» Correct answer is (a) Complete inhibition For explanation: Linear inhibition is sometimes called complete inhibition, and the contrasting term partial inhibition is sometimes used for a type of non-linear inhibition in which saturation with inhibitor does not decrease the rate to zero. These latter terms are discouraged because they can be misleading, implying, for example, that the rate may indeed be decreased to zero in ‘complete inhibition’ at non-saturating concentrations of inhibitor. |
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| 38. |
Which of the following is not a disadvantage of continuous culture?(a) Long growth periods of subtrates/microbes(b) Maintenance of mixed cultures(c) Requires feed-batch culturing(d) Viscosity of mixture for filamentous organisms |
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Answer» Right choice is (b) Maintenance of mixed cultures Easiest explanation: Continuous culture provides a higher degree of control than a batch culture. Growth rates can be regulated and maintained for extended periods. By varying the dilution rate, biomass concentration can be controlled. Secondary metabolite production can be sustained simultaneously along with growth. In steady state continuous culture, mixed cultures can be maintained using chemostat cultures – unlike in a batch process where one organism usually outgrows another. |
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| 39. |
Variation of the rate constant k with temperature is described by which equation?(a) Arrhenius equation(b) Monod equation(c) Kirchoff’s equation(d) Newton’s second law of thermodynamics |
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Answer» Right choice is (a) Arrhenius equation Explanation: Temperature has a significant kinetic effect on reactions. Variation of the rate constant k with temperature is described by the Arrhenius equation: k = A e^-E/RT Where, k is the rate constant, A is the Arrhenius constant or frequency factor, E is the activation energy for the reaction, R is the ideal gas constant, and T is absolute temperature. According to the Arrhenius equation, as T increases, k increases exponentially. Taking the natural logarithm of both sides of equation: Thus, a plot of ln k versus 1/T gives a straight line with slope -E/R . For many reactions the value of E is positive and large, indicating a rapid increase in reaction rate with temperature. |
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| 40. |
Dilution refilling is done with______(a) Non- sterile water(b) Sterile water(c) Microbes(d) Waste |
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Answer» Right option is (b) Sterile water Explanation: Dilution would be achieved by withdrawing culture and refilling to the original level with sterile water or medium not containing the feed substrate. |
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| 41. |
Conversion of substrate to ammonia and organic acid is by _______(a) Nitrification(b) Proteolysis(c) Peptidase(d) Deaminase |
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Answer» Correct choice is (a) Nitrification Best explanation: Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate. The transformation of ammonia to nitrite is usually the rate limiting step of nitrification. Nitrification is an important step in the nitrogen cycle in soil. Nitrification is an aerobic process performed by small groups of autotrophic bacteria and archaea. |
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| 42. |
Conversion of substrate to amino acids is called __________(a) Nitrification(b) Proteolysis(c) Peptidase(d) Deaminase |
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Answer» Correct choice is (b) Proteolysis Best explanation: Proteolysis is the breakdown of proteins into smaller polypeptides or amino acids. Uncatalysed, the hydrolysis of peptide bonds is extremely slow, taking hundreds of years. Proteolysis is typically catalysed by cellular enzymes called proteases, but may also occur by intra-molecular digestion. Low pH or high temperatures can also cause proteolysis non-enzymatically. |
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| 43. |
Read the following passage. After the war, our church was in a very bad condition. So we decided to build a new one on the top of a hill just outside the town. We used many different kinds of materials. We built the walls of stone and glass, the heavy doors of wood and metal. From the top of the church there was a wonderful view. You can see the entire town and countryside for miles around. People from all parts of the country visit the church every day. It is such an interesting building.. Now, answer the following questions. 1) What was the condition of the church after the war?2) Where did the people want to build the church?3) The walls of the new church were made of ……a) wood and glassb) wood and metal c) stone and glass4) The doors were made of …..a) metal and wood b) cement and bricks c) glass and marble5) Choose the correct statement from the following.a) The new church was built in a town. b) The new church was in interesting building. c) The new church had no walls and doors. |
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Answer» 1. The church was in a very bad condition after the war. 2. on the top of the hill 3. c) stone and glass 4. a) metal and wood 5. b) The new church was in interesting building. |
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| 44. |
Read the following passage carefully. Do you know that you are a mammal? Any animal that gives birth to live babies; not eggs, and feeds ifs young on milk are called mammals. Cows, humans and whales are all mammals. Mammals are warm-blooded animals. Most mammals have hair on their bodies. Many mammals live on land. People, elephants, rabbits, dogs and cows, cats are all land mammals. Some animals like dolphins and whales, live in water. The seal, walrus and otter are mammals that live on land and in the water. Did you know there is even a mammal that flies? It is the bat. Now answer the following questions. 1) What are called mammals?2) Write some characteristics of mammals.3) Mammals are …… animals.a) cold blooded b) warm blooded c) white blooded4) Which of the following is not a mammal? a) bat b) whale5) Which of the following birds is a mammal? a) duck b) hen c) bat |
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Answer» 1. The animals that give birth to babies, not eggs, and feed their young ones on milk are called mammals. 2. Mammals are warm-blooded animals. b) Mammals have hair on their bodies. 3. b) warm blooded 4. c) hen 5. c) bat |
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| 45. |
Read the following passage carefully. Perhaps you have seen a green, fuzzy spot on bread or cheeses. If so, it was probably mold. Mold is a kind of plant called fungi. The most common molds are green or black. Mold likes to grow in a moist, warm places. But where does it come from? Mold comes from spores, which exist in the air. If these find a moist, warm place they will produce mold. Mold grows weds of fuzzy branches. It continues to grow as long as the conditions are right. Foods such as cheese, fruit and bread can develop mold, If they are left out in a warm damp room. Mold may even grow on leather shoes, belts or furniture. Mold is usually thougt of as a problem. But some molds are valuable to scientists. The most famous mold is called penicillium Notatum. This mold is used to make a valuable drug called penicillin. Now answer the following questions. 1) What is mold?2) How are the molds useful to scientists?3) Mold grows in ...... places.a) dry and warm b) moist and warm c) dry and cool4) Mold comes from:a) fungi b) spores c) pencillin5) Penicillium Notation is a ........ a) drug b) plant c) mold |
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Answer» 1. Mold is a kind of plant called fungi. 2. Some molds are valuable to scientists. Scientist produce a drug called penicillin from the mold ‘Penicillium Notatum’. 3. b) moist and warm 4. b) spores 5. c) mold |
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| 46. |
The equilibrium constant (K) depends on __________(a) Pressure(b) pH(c) Temperature(d) Density |
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Answer» Correct option is (c) Temperature The best I can explain: The value of K depends on temperature as follows: where, ΔG°rxn is the change in standard free energy per mole of A reacted, R is the ideal gas constant and T is absolute temperature. |
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| 47. |
What do you mean by “kLa”?(a) Volumetric mass transfer coefficient(b) Henry’s law coefficient(c) Volumetric oxygen transfer coefficient(d) Volumetric Solute transfer coefficient |
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Answer» Right answer is (c) Volumetric oxygen transfer coefficient Best explanation: The value of the specific exchange surface (a) is difficult to determine for small bubbles found in a bioreactor. So, the entire term “kLa” is often called the volumetric oxygen transfer coefficient. |
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| 48. |
Refer to Q5 and, calculate the same for equilibrium constant at 75°C.(a) 1.15(b) 1.16(c) 1.18(d) 1.17 |
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Answer» Right choice is (a) 1.15 Easy explanation: T = 75°C = 348.15 K |
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| 49. |
Which of the following non-metallic material is not used in the synthesis of molds?(a) Magnesite(b) Silimanite(c) Zircon(d) Valcanised rubber |
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Answer» Right option is (d) Valcanised rubber The explanation: Valcanised rubber has a very low refractoriness, hence, using valcanised rubber for making molds can cause damage to the mold cavity or metallic structure so formed. |
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| 50. |
What is the range of temperature used for baking molds using plaster moulding process?(a) 50°-100°(b) 80°-120°(c) 120°-260°(d) 250°-300° |
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Answer» The correct choice is (c) 120°-260° For explanation I would say: The preset mould is ignited to burn off the volatile content in the set gel to a temperature range of 120°-260°. |
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