MCQOPTIONS
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MCQOPTIONS
This section includes 2167 Mcqs, each offering curated multiple-choice questions to sharpen your Php knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
Is archebacteria a type of bacteria? |
| A. | True |
| B. | False |
| Answer» C. | |
| 602. |
Mark the INCORRECT statement about cyanobacteria. |
| A. | Gram-negative bacteria |
| B. | Photolithoautotrophic organism |
| C. | They do not have a fully functional citric acid cycle |
| D. | Reproduce only by binary fission |
| Answer» E. | |
| 603. |
What is the basic taxonomic unit? |
| A. | RNA |
| B. | Phylogenetic tree |
| C. | Species |
| D. | Cell |
| Answer» D. Cell | |
| 604. |
Creep rate is higher for α-iron than for ϒ-iron. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 605. |
What is the rate controlling factor in high temperature creep? |
| A. | Dislocation glide |
| B. | Grain boundary sliding |
| C. | Dislocation climb |
| D. | Slip |
| Answer» D. Slip | |
| 606. |
Which of the following is a secondary deformation process? |
| A. | Slip |
| B. | Subgrain formation |
| C. | Grain boundary sliding |
| D. | Multiple slips |
| Answer» E. | |
| 607. |
Which of the following is a principal deformation process? |
| A. | Multiple slips |
| B. | Kink bands formation |
| C. | Subgrain formation |
| D. | Fold formation |
| Answer» D. Fold formation | |
| 608. |
_________ is a creep recovery process. |
| A. | Subgrain formation |
| B. | Dislocation pile up |
| C. | Grain boundary migration |
| D. | Slip |
| Answer» D. Slip | |
| 609. |
Slip band spacing _________ with increasing stress. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases, then decrease |
| Answer» C. Remains constant | |
| 610. |
On _________ temperature slip may also occur on non-close packed planes. |
| A. | Sub-zero |
| B. | Elevated |
| C. | Melting |
| D. | Low |
| Answer» C. Melting | |
| 611. |
How many times is the function recursive_sum() called when the following code is executed? |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7View Answer |
| Answer» D. 7View Answer | |
| 612. |
What is the time complexity of the following recursive implementation used to find the sum of the first n natural numbers? |
| A. | O(1) |
| B. | O(n) |
| C. | O(n2) |
| D. | O(n3)View Answer |
| Answer» C. O(n2) | |
| 613. |
Consider the following code: Which of the following is the base case for the above recursive code? |
| A. | if(n == 0) |
| B. | return 0 |
| C. | return n + recursive_sum(n – 1) |
| D. | if(n == 1)View Answer |
| Answer» B. return 0 | |
| 614. |
Consider the following code: Which of the following lines is the recurrence relation for the above code? |
| A. | (n – 1) +recursive_sum(n) |
| B. | n + recursive_sum(n) |
| C. | n + recursive_sum(n – 1) |
| D. | (n – 1) + recursive_sum(n – 1)View Answer |
| Answer» D. (n – 1) + recursive_sum(n – 1)View Answer | |
| 615. |
What is the time complexity of the following iterative method used to find the sum of the first n natural numbers? |
| A. | O(1) |
| B. | O(n) |
| C. | O(n2) |
| D. | O(n3)View Answer |
| Answer» C. O(n2) | |
| 616. |
Consider the following iterative solution to find the sum of first n natural numbers: Which of the following lines completes the above code? |
| A. | sm = i |
| B. | sm += i |
| C. | i = sm |
| D. | i += smView Answer |
| Answer» C. i = sm | |
| 617. |
Which of the following option is wrong about natural numbers? |
| A. | Sum of first n natural numbers can be calculated by using Iteration method |
| B. | Sum of first n natural numbers can be calculated by using Recursion method |
| C. | Sum of first n natural numbers can be calculated by using Binomial coefficient method |
| D. | No method is prescribed to calculate sum of first n natural number |
| Answer» E. | |
| 618. |
Which is the most widely used Sulfonating agent in Industries? |
| A. | Oleum |
| B. | Sulphur dioxide |
| C. | Sulfuric acid |
| D. | None of the mentioned |
| Answer» B. Sulphur dioxide | |
| 619. |
What is the other name of series of solutions of S03 in water? |
| A. | Oleum |
| B. | Sulfuric acid |
| C. | Oleum & Sulfuric acid |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 620. |
What happens to the stability of hydrates of SO3, with increase in temperature? |
| A. | Decreases |
| B. | Increases |
| C. | Does not affect |
| D. | None of the mentioned |
| Answer» B. Increases | |
| 621. |
What is the name of the following compound S03-2H20? |
| A. | Monohydrate |
| B. | Dihydrate |
| C. | Trihydrate |
| D. | Tetra hydrate |
| Answer» C. Trihydrate | |
| 622. |
Which of the following is not a Sulphur trioxide compound? |
| A. | Oleum |
| B. | Sulfamic acid |
| C. | Sulphurous acid |
| D. | Chloro sulfonic acid |
| Answer» D. Chloro sulfonic acid | |
| 623. |
The moment of inertia of a body about a given axis is 1.2kgm2. Initially, the body at rest. In order to produce a rotational kinetic energy of 1500 joule, an angular acceleration of 25radian/sec2 must be applied about the axis for duration of ___________ |
| A. | 4s |
| B. | 2s |
| C. | 8s |
| D. | 10s |
| Answer» C. 8s | |
| 624. |
Statement 1: If polar ice melts, days will be longer.Statement 2: Moment of inertia decreases and thus angular velocity increases. |
| A. | Both statement 1 and 2 are true and statement2 is the correct explanation of the statement1 |
| B. | Both statement 1 and 2 are true but the statement2 is not the correct explanation of the statement1 |
| C. | Statement 1 is true but statement 2 is false |
| D. | Statement 1 and 2 are false |
| Answer» B. Both statement 1 and 2 are true but the statement2 is not the correct explanation of the statement1 | |
| 625. |
Moment of inertia of an object does not depend upon ___________ |
| A. | Mass of object |
| B. | Mass of distribution |
| C. | Angular velocity |
| D. | Axis of rotation |
| Answer» D. Axis of rotation | |
| 626. |
Analogue of mass in rotational motion is ___________ |
| A. | Moment of inertia |
| B. | Angular momentum |
| C. | Gyration |
| D. | Angular acceleration |
| Answer» B. Angular momentum | |
| 627. |
If a person standing on a rotating disc stretches out his hands, the angular speed will ___________ |
| A. | Increase |
| B. | Decrease |
| C. | Remains same |
| D. | Increases and then decreases |
| Answer» C. Remains same | |
| 628. |
Statement 1: If there is no external torque on the body about its centre of mass, then the velocity of the centre of mass remains constant.Statement 2: The linear momentum of the isolated system remains constant. |
| A. | Statements 1 and 2 are true and statement 2 is the correct explanation of statement 1 |
| B. | Statement one and two are true and statement2 is not the correct explanation of statement1 |
| C. | Statement 1 is true, statement 2 is false |
| D. | Statement 2 is true, statement 1 is false |
| Answer» E. | |
| 629. |
If the resultant of all the external forces acting on a system of particles is 0, then from an inertial frame, one can surely say that ___________ |
| A. | Linear momentum of the system does not change in time |
| B. | Kinetic energy of the system does not change in time |
| C. | Angular momentum of the system does not change in time |
| D. | Potential energy of the system does not change in time |
| Answer» B. Kinetic energy of the system does not change in time | |
| 630. |
A mass m is moving with a constant velocity along a line parallel to the x-axis, away from the origin. Its angular momentum with respect to the origin ___________ |
| A. | Is zero |
| B. | Remains constant |
| C. | Goes on increasing |
| D. | Goes on decreasing |
| Answer» C. Goes on increasing | |
| 631. |
The instantaneous speed of the point of contact during rolling is zero. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 632. |
Temperature maintained in batch hydrogenators is _______ |
| A. | above 200°C |
| B. | below 200°C |
| C. | 120-160°C |
| D. | 180°C |
| Answer» C. 120-160°C | |
| 633. |
What type of agitators is used in batch operation of hydrogenation of oils? |
| A. | Anchor agitators |
| B. | Propeller agitators |
| C. | Turbine agitators |
| D. | Helical agitators |
| Answer» D. Helical agitators | |
| 634. |
Which distillation technique is used to remove sulfur containing compounds from the synthesis gas processes? |
| A. | Cryogenic distillation |
| B. | Steam distillation |
| C. | Azeotropic distillation |
| D. | Industrial distillation |
| Answer» B. Steam distillation | |
| 635. |
Which catalyst is used in the hydrogenation of oils? |
| A. | Activated platinum |
| B. | Activated rhodium |
| C. | Activated palladium |
| D. | Activated nickel |
| Answer» E. | |
| 636. |
Which solvent is used for the purification of oils? |
| A. | Acetone |
| B. | Ethanol |
| C. | Propane |
| D. | Butyl alcohol |
| Answer» D. Butyl alcohol | |
| 637. |
Which of the following is not an activated nickel catalyst preparation reaction? |
| A. | Ni(OH)2 + H2 → Ni+H2O |
| B. | Ni(CO)4 → Ni + 4CO |
| C. | 2Al·Ni + 6NaOH → Ni + 2NaAlO3 + 3H2 |
| D. | NiCO3 + H2 → Ni+H2O + CO2 |
| Answer» C. 2Al·Ni + 6NaOH → Ni + 2NaAlO3 + 3H2 | |
| 638. |
Which fatty acid has high reactivity towards oxygen? |
| A. | Stearic acid |
| B. | Linoleic acid |
| C. | Oleic acid |
| D. | Linolenic acid |
| Answer» E. | |
| 639. |
Which of the following is not edible oil? |
| A. | Groundnut oil |
| B. | Coconut oil |
| C. | Cottonseed oil |
| D. | Spearmint oil |
| Answer» E. | |
| 640. |
The ratio of actual mass flow through the nozzle to the mass flow if the flow were isentropic is? |
| A. | Coefficient of viscosity |
| B. | Coefficient of velocity |
| C. | Coefficient of discharge |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 641. |
Due to friction between the fluid & walls of the nozzle, the expansion process is? |
| A. | reversible |
| B. | irreversible |
| C. | reversible adiabatic |
| D. | irreversible adiabatic |
| Answer» E. | |
| 642. |
Evaporative type of condenser has ________ |
| A. | Water in pipes surrounded by steam outside |
| B. | Steam and cooling water mixed to give the condensate |
| C. | Steam in pipes surrounded by water |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 643. |
Water used in the steam plant is used for cooling in _______________ |
| A. | Condenser |
| B. | Turbine only |
| C. | Boiler tube |
| D. | Boiler tubes and turbines |
| Answer» B. Turbine only | |
| 644. |
What is the definition of the draught system? |
| A. | A device used to pull in air |
| B. | The difference between absolute gas pressure at any point in a gas flow and the ambient atmospheric pressure |
| C. | The sum of the absolute gas pressure at any point in a gas flow and the ambient atmospheric pressure |
| D. | A device used to pull out air |
| Answer» E. | |
| 645. |
Air-Preheater in a steam power plant _____________ |
| A. | Recovers the heat from the flue gases leaving the economiser |
| B. | Improves combustion rate |
| C. | Raises the temperature of the furnace gases |
| D. | All of the mentioned |
| Answer» E. | |
| 646. |
Governing principle(s) of steam turbine is? |
| A. | Nozzle control governing |
| B. | Throttle governing |
| C. | Bypass governing |
| D. | All of the mentioned |
| Answer» E. | |
| 647. |
The __________ of an AM signal resembles the shape of baseband signal. |
| A. | upperband |
| B. | lowerband |
| C. | efficiency |
| D. | envelope |
| Answer» E. | |
| 648. |
To demodulate a USB SSB signal, the receiver must ________ |
| A. | be set to USB mode |
| B. | reinsert the carrier |
| C. | be set to USB mode and reinsert the carrier |
| D. | have low-fidelity |
| Answer» D. have low-fidelity | |
| 649. |
A single sideband modulation system requires a more complex demodulator circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 650. |
Which frequencies is produced if Va sin(ωa t) amplitude modulates the carrier Vc sin(ωc t)?a) (ωc + ωa), (ωc – ωa) and ωcb) (ωc) and (ωa)c) (ωc + ωa) and (2ωc + 2ωa)d) (2ωc) and (2ω |
| A. | (ωc + ωa), (ωc – ωa) and ωc |
| B. | (ωc) and (ωa)c) (ωc + ωa) and (2ωc + 2ωa)d) (2ω |
| C. | and (ωa)c) (ωc + ωa) and (2ωc + 2ωa) |
| D. | (2ωc) and (2ωa) |
| Answer» B. (ωc) and (ωa)c) (ωc + ωa) and (2ωc + 2ωa)d) (2ω | |