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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 31
Q1 | Response of eddy current is depends upon
- magnetic permeability
- electrical conductivity
- structural defects
- all of theabove
Q2 | The result can be recorded by permanently in
- magnafluxtest
- eddy currenttest
- dye penetrant test
- radiography
Q3 | The crack depth measurement is possible in
- magnafluxtest
- eddy currenttest
- ultrasonictest
- both b and c
Q4 | Measurement of the electric cunductivity of silver plated electrical contact is possible by
- magnaflux test
- eddy currenttest
- ultrasonictest
- both b and c
Q5 | Quartz is used in NDT
- ultrasonic
- magnaflux
- radiography
- dye penetrant
Q6 | Flouroscent is used in NDT
- ultrasonic
- eddy current
- radiography
- dye penetrant and magnaflu x
Q7 | Electric current is not used in NDT
- ultrasonic
- magnaflux
- eddy current
- dye penetrant
Q8 | AC is used in magnaflux test to detect
- surface defect
- surface and sub surface defect
- internal defects
- subsurfacedefect
Q9 | DC is used in magnaflux test to detect
- surface
- surface and surface
- internal
- sub surface
Q10 | X-rays are produced by stricking
- agains t surface defect
- electrons against anode
- magnetic field material
- electrons against cathode
Q11 | Radioactive decay of radium and saltwill cause generation of
- ultrasonic waves
- magnetic waves
- gamma rays
- x-rays and gamma rays
Q12 | destruction of metal through unwanted or unintentional chemical or electrochemical reaction is known as
- erosion
- corrosion
- both a and b
- none of the above
Q13 | the corrosion which occurs due to chemical reaction between metal and atmospheric gases is known as
- atmospheric corrosion
- dry corrosion
- both a and b
- wet corrosion
Q14 | the extent of dry corrosion depends on
- chemical affinity between the environment
- adheshion between the film and metal surface
- both a and b
- none of the above
Q15 | in case of dry corroison if the protective film formed is porous
- it gives good protection
- it gives bad protection
- no where it is related to corrosion resistance
- none of the above
Q16 | in conducting corrosion the intensity of corrosion depends on
- electronic and ionic conductivitie s of the film
- type of electrons
- type of atmosphere
- none of the above
Q17 | the common example of direct corrosion is
- rusting of iron and steel
- corrosion of copper flashing in steel
- tarnishing of silverware
- all of the above
Q18 | the type of corrosion which takes place due to electrochemical reaction is known as
- dry corrosion
- wet corroison
- none of the above
- all of the above
Q19 | wet corroison occurs under conditions
- when conducting liquid is in contact with metal
- when two dissimilar metals are immersed in aqueous
- single metals is dipped partially in aqueous solution of
- all of the above
Q20 | in corrosion at cathodic area
- there is gain of electrons
- reduction takes palce
- usually metal do not get affected
- all of the above
Q21 | electrode potential of metal depends upon
- chemical nature of metal
- nature of solution in which metal is immmersed
- temperature of the solution to some extent
- all of the above
Q22 | in corroison at anodic area
- there is liberation of free electrons
- oxidation take place
- there is tendency to destroy the metal
- all of the above
Q23 | more negative electrode potential of metal indicates
- higher probability of corrosion
- lower probability of corrosion
- both a and b
- none of the above
Q24 | dissolution of metal as corressponding metal ions with liberatoin of electrons is known as
- anodic reaction
- cathodic reaction
- oxidation
- both a and c
Q25 | M --> M+ + e- is chemical reaction which is
- anodic reaction
- cathodic reaction
- oxidation
- both a and c