MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4951. |
Iron & manganese present in the polluted water is removed by |
| A. | simple filtration. |
| B. | oxidation followed by settling & filtration. |
| C. | chemical coagulation. |
| D. | chlorination only. |
| Answer» C. chemical coagulation. | |
| 4952. |
Water effluent generated in printing industry is decolourised by |
| A. | ion exchange technique. |
| B. | reverse osmosis. |
| C. | electrolytic decomposition. |
| D. | adsorption. |
| Answer» D. adsorption. | |
| 4953. |
Which of the following radioactive wastes emits all , & rays and hence is the most hazardous of all radioactive emitters? |
| A. | I-131 |
| B. | Sr-90 |
| C. | Au-198 |
| D. | Ra-226 |
| Answer» E. | |
| 4954. |
COD of raw municipal sewage may be in the range of about __________ mg/litre. |
| A. | 1-2 |
| B. | 5-10 |
| C. | 90-120 |
| D. | 1500-2500 |
| Answer» D. 1500-2500 | |
| 4955. |
Maximum permissible turbidity in potable water is __________ ppm. |
| A. | 1 |
| B. | 10 |
| C. | 250 |
| D. | 1000 |
| Answer» C. 250 | |
| 4956. |
What are the methods of treatment & disposal of radioactive wastes ? |
| A. | Evaporation & chemical precipitation. |
| B. | Biological methods & adsorption in ion exchange materials. |
| C. | Fixing into a solid mass with cement and sinking deep in the sea. |
| D. | All (a), (b) & (c). |
| Answer» E. | |
| 4957. |
Main pollutant present in automobile exhaust is |
| A. | CO |
| B. | CO |
| C. | <sub>2</sub> |
| D. | NO |
| E. | hydrocarbons |
| Answer» B. CO | |
| 4958. |
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels. |
| A. | 20 |
| B. | 60 |
| C. | 90 |
| D. | 120 |
| Answer» D. 120 | |
| 4959. |
Industrial workers working in leather tanning & manufacturing units are prone to suffer from |
| A. | respirtory ailments (e.g. bronchitis). |
| B. | skin diseases (e.g. dermatities). |
| C. | silicosis. |
| D. | blurred vision. |
| Answer» C. silicosis. | |
| 4960. |
Which of the following is an autocatalytic reaction ? |
| A. | Photochemical reactions |
| B. | Microbial fermentation reaction |
| C. | Enzyme fermentation reaction |
| D. | Ammonia synthesis reaction |
| Answer» C. Enzyme fermentation reaction | |
| 4961. |
The performance of a cascade of CSTR's can be improved by adding |
| A. | a P.F. reactor in series. |
| B. | a P.F. reactor in parallel. |
| C. | more CSTR's in series. |
| D. | more CSTR's in parallel. |
| Answer» D. more CSTR's in parallel. | |
| 4962. |
A multiple reaction may be classified as a __________ reaction. |
| A. | consecutive or side |
| B. | parallel or side |
| C. | mixed |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 4963. |
Holding time for flow reactors is __________ the space time, for constant fluid density |
| A. | double |
| B. | triple |
| C. | equal to |
| D. | none of these. |
| Answer» D. none of these. | |
| 4964. |
Kinetics of a solid catalysed reaction can best be studied in a __________ reactor. |
| A. | batch |
| B. | plug-flow |
| C. | mixed |
| D. | none of these |
| Answer» D. none of these | |
| 4965. |
The reactions of high molecularity are rare, because |
| A. | of very large activation energy of many bodies. |
| B. | of low probability of many body collisions. |
| C. | many body collisions are not favoured energetically. |
| D. | of requirement of very large concentration for such reactions. |
| Answer» C. many body collisions are not favoured energetically. | |
| 4966. |
Arrhenious equation represents graphically the variation between the __________ and temperature. |
| A. | rate of reaction |
| B. | frequency factor |
| C. | rate constant |
| D. | activation energy |
| Answer» D. activation energy | |
| 4967. |
__________ catalytic reaction is involved in the thermal cracking of gas oil. |
| A. | Homogeneous |
| B. | Homogeneous non |
| C. | Heterogeneous |
| D. | Heterogeneous non |
| Answer» B. Homogeneous non | |
| 4968. |
A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction. |
| A. | less than |
| B. | equal to |
| C. | more than |
| D. | equal to or more than |
| Answer» E. | |
| 4969. |
Differential method for analysing the kinetic data is used |
| A. | for testing complicated mechanisms. |
| B. | when the data are scattered. |
| C. | when rate expressions are very simple. |
| D. | none of these. |
| Answer» B. when the data are scattered. | |
| 4970. |
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is |
| A. | more |
| B. | less |
| C. | same |
| D. | either (a) or (b), depends on other factors |
| Answer» D. either (a) or (b), depends on other factors | |
| 4971. |
The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction. |
| A. | elementary |
| B. | non-elementary |
| C. | parallel |
| D. | autokinetic |
| Answer» B. non-elementary | |
| 4972. |
The reaction A B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is |
| A. | 0 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» B. 1 | |
| 4973. |
For a zero order reaction, the concentration of product increases with the |
| A. | increase of reaction time. |
| B. | increase in initial concentration. |
| C. | total pressure. |
| D. | decrease in total pressure. |
| Answer» B. increase in initial concentration. | |
| 4974. |
Effectiveness factor of a catalyst pellet is a measure of the __________ resistance. |
| A. | pore diffusion |
| B. | gas film |
| C. | chemical reaction |
| D. | none of these |
| Answer» B. gas film | |
| 4975. |
A catalyst inhibitor |
| A. | lessens its selectivity. |
| B. | may be useful for suppressing undesirable side reactions. |
| C. | is added in small quantity during the catalyst manufacture itself. |
| D. | all(a), (b) and (c). |
| Answer» E. | |
| 4976. |
If the rate of a chemical reaction becomes slower at a given temperature, then the |
| A. | initial concentration of the reactants remains constant. |
| B. | free energy of activation is lower. |
| C. | entropy changes. |
| D. | free energy of activation is higher. |
| Answer» E. | |
| 4977. |
The rate of the reaction, X Y, quadruples when the concentration of 'X' is doubled. The rate expression for the reaction is, r = K Cxn, the value of 'n' in this case will be |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 4978. |
The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt |
| A. | at the inlet |
| B. | at the outlet |
| C. | in the reactor |
| D. | averaged over the inlet and outlet |
| Answer» C. in the reactor | |
| 4979. |
A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to |
| A. | lose a proton. |
| B. | gain a proton. |
| C. | lose an electron |
| D. | none of these. |
| Answer» B. gain a proton. | |
| 4980. |
The catalyst in a second order reversible reaction increases the rate of the forward reaction |
| A. | and decreases that of backward reaction. |
| B. | and backward reaction equally. |
| C. | only. |
| D. | to a greater extent than that of the backward reaction. |
| Answer» C. only. | |
| 4981. |
Catalyst carriers |
| A. | have very high selectivity. |
| B. | increase the activity of a catalyst. |
| C. | provide large surface area with a small amount of active material. |
| D. | inhibit catalyst poisoning. |
| Answer» D. inhibit catalyst poisoning. | |
| 4982. |
For the liquid phase zero order irreversible reaction A B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1 . What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR. |
| A. | 0.15 |
| B. | 0.30 |
| C. | 0.60 |
| D. | 0.90 |
| Answer» D. 0.90 | |
| 4983. |
A high space velocity means that a given |
| A. | reaction can be accomplished with small reactor. |
| B. | conversion can be obtained with a high feed rate. |
| C. | both (a) and (b). |
| D. | none of these. |
| Answer» D. none of these. | |
| 4984. |
In flow reactors, the performance equations interrelate the rate of reaction to the |
| A. | feed rate. |
| B. | reactor volume, |
| C. | extent of reaction. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4985. |
The rate of a chemical reaction is almost doubled for every 10 C rise in temperature. The rate will increase __________ times, if the temperature rises form 10 to 100 C. |
| A. | 256 |
| B. | 512 |
| C. | 112 |
| D. | 612 |
| Answer» C. 112 | |
| 4986. |
A catalyst in a chemical reaction __________ free energy change in the reaction. |
| A. | increases |
| B. | decreases |
| C. | either (a) or (b); depends on the type of catalyst |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 4987. |
Signal normally used to study non-ideal flow by stimulus response technique is __________ input. |
| A. | pulse |
| B. | step |
| C. | both (a) & (b) |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 4988. |
The effect of increasing pressure on the gaseous equilibrium of the reaction 2X+3Y 3X+2Y indicates that |
| A. | pressure has no effect. |
| B. | backward reaction is favoured. |
| C. | forward reaction is favoured. |
| D. | none of these. |
| Answer» B. backward reaction is favoured. | |
| 4989. |
A batch reactor is characterised by |
| A. | constant residence time. |
| B. | variation in extent of reaction and properties of the reaction mixture with time. |
| C. | variation in reactor volume. |
| D. | very low conversion. |
| Answer» C. variation in reactor volume. | |
| 4990. |
When a catalyst increases the rate of forward reaction, the value of rate constant |
| A. | increases |
| B. | decreases |
| C. | remain same |
| D. | becomes infinite |
| Answer» B. decreases | |
| 4991. |
Rate determining step in a reaction consisting of a number of steps in series is the __________ step. |
| A. | fastest |
| B. | slowest |
| C. | intermediate |
| D. | data insufficient; can't be predicted |
| Answer» C. intermediate | |
| 4992. |
The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst. |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | unpredictable from the data |
| Answer» D. unpredictable from the data | |
| 4993. |
The rate constant of a chemical reaction increases by increasing the |
| A. | temperature |
| B. | pressure |
| C. | reactant's concentration |
| D. | none of these |
| Answer» B. pressure | |
| 4994. |
The catalytic activity of enzymes is due to their capacity to lower the __________ energy. |
| A. | activation |
| B. | potential |
| C. | kinetic |
| D. | none of these |
| Answer» B. potential | |
| 4995. |
A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ? |
| A. | Large reactor followed by smaller one. |
| B. | Smaller reactor followed by larger one. |
| C. | Either of the arrangement (a) or (b) will give the same yield. |
| D. | Data insufficient, can't be predicted. |
| Answer» D. Data insufficient, can't be predicted. | |
| 4996. |
Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 4997. |
Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature ? |
| A. | Time |
| B. | Useful volume of the tank |
| C. | Diameter of the reactor |
| D. | None of these |
| Answer» B. Useful volume of the tank | |
| 4998. |
For reactions in parallel viz A P (desired product) and A Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a |
| A. | batch reactor is preferred over a single CSTR for high yield. |
| B. | tubular reactor is preferred over a single CSTR for high yield. |
| C. | both (a) and (b). |
| D. | single CSTR is the most suitable. |
| Answer» D. single CSTR is the most suitable. | |
| 4999. |
For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times. |
| A. | 8 |
| B. | 16 |
| C. | 1/8 |
| D. | 1/16 |
| Answer» C. 1/8 | |
| 5000. |
In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will |
| A. | remain the same |
| B. | be halved |
| C. | also be. doubled |
| D. | become one fourth |
| Answer» B. be halved | |