BPSC AE 2025: Assistant Engineer (Civil/Mechanical/Electrical) (Advt. 30/2025), Paper VI Mechanical Engineering

Bihar Public Service Commission
 Advt. No. 30/2025, Mechanical Engineering, Paper-VI
           Exam Date: 19-07-2025, 2nd shift
               Final Answer key (Set-E)
Q. No.    Answer Key           Q. No.         Answer Key
  1             C                 26           Deleted
  2             A                 27           Deleted
  3             A                 28              D
  4             A                 29              A
  5             A                 30              B
  6             B                 31              B
  7             A                 32              B
  8             B                 33              C
  9             A                 34              D
 10             B                 35              A
 11             D                 36              A
 12             C                 37              C
 13             A                 38              C
 14             B                 39              A
 15             D                 40              A
 16             A                 41              B
 17             C                 42              A
 18             C                 43              D

Q. No.   Answer Key             Q. No.   Answer Key
 19          C                   44          C
 20          D                   45          D
 21          C                   46          A
 22       Deleted                47          D
 23          D                   48          C
 24          D                   49          B
 25          B                   50          D


                      (Set-F)
Q. No.   Answer Key             Q. No.   Answer Key
  1          C                   26          B
  2          B                   27          A
  3          D                   28          B
  4          A                   29          C
  5          A                   30          B
  6          A                   31          A
  7          D                   32          C
  8          A                   33          D
  9       Deleted                34          A
 10          B                   35          C
 11          D                   36          C
 12          C                   37          D
 13          B                   38          A

Q. No.   Answer Key             Q. No.   Answer Key
 14          B                   39          D
 15          B                   40          B
 16          A                   41          B
 17          D                   42          C
 18          C                   43          D
 19          A                   44          B
 20          C                   45          C
 21          C                   46          A
 22          D                   47          C
 23          C                   48       Deleted
 24          A                   49          D
 25       Deleted                50          B


                      (Set-G)
Q. No.   Answer Key             Q. No.   Answer Key
  1          A                   26          D
  2          C                   27          D
  3          C                   28          B
  4          C                   29          C
  5          A                   30          C
  6       Deleted                31          C
  7          D                   32          B
  8          C                   33          A

Q. No.   Answer Key             Q. No.   Answer Key
  9          D                   34          A
 10          A                   35          B
 11          B                   36          C
 12       Deleted                37          B
 13          C                   38          D
 14          A                   39          B
 15          A                   40          A
 16          D                   41       Deleted
 17          B                   42          B
 18          B                   43          A
 19          B                   44          C
 20          B                   45          B
 21          D                   46          C
 22          C                   47          B
 23          B                   48          D
 24          A                   49          D
 25          D                   50          B


                      (Set-H)
Q. No.   Answer Key             Q. No.   Answer Key
  1       Deleted                26          D
  2          C                   27          A
  3          D                   28          A

Q. No.   Answer Key   Q. No.   Answer Key
  4          B         29          C
  5          A         30          D
  6          C         31          A
  7          C         32          D
  8          B         33          C
  9          C         34          B
 10       Deleted      35          C
 11          D         36          D
 12          B         37          B
 13          B         38          C
 14          D         39          A
 15          D         40          C
 16          B         41          B
 17          C         42          A
 18          C         43       Deleted
 19          B         44          D
 20          A         45          D
 21          C         46          A
 22          A         47          D
 23          A         48          C
 24          B         49          C
 25          A         50          C

Reason as per Set-E


Q.No.- 07- No Change.
Reason :- Glass transition (Tg) temperature is an intrinsic property of polymer.
           Hence polymer temperature has no significant effect on Tg.
           Ref:- Material Science & Engineering by Callister, D.William, Willey
                 publication.
Q.No.-19- No Change.
Reason :- Calculated value of cylinder thickness is 16.67mm, To avoid failure,
          thickness should be more than 16.67 mm 20mm (approximately).
Q.No.-21- The Provisional answer is option 'A' but the correct answer is option 'C'.
Reason :- Loss modulus represents the dissipation of energy in a polymer under
          cyclic loading.
          Ref:- Material science & Engineering by Callister D.William, Willey
                Publication.
Q.No.-22- Deleted.
Reason :- Calculated diameter of the shaft is 251.9mm. None of the options is
          correct. Hence, the question is deleted.
Q.No.-26- Deleted.
Reason :- Multiple options are correct. Hence, the question is deleted.
          Ref: Industrial Engineering by O.P.Khanna
Q.No.-27- Deleted.
Reason :- Calculated value of maximum torque is not matching with the given
          options. None of the options are correct. Hence, the question is deleted.
Q.No.-32- No Change.
Reason :- Increase in punch radius does not influence much on punch load.
          Ref:-1. manufacturing science by A.Ghosh & Mallick.
               2. Metal forming by W.F Hosford and R.M.Caddel PH Publication.
Q.No.-45- No Change.
Reason    :- Calculated value of the ratio of the buckling strength is