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MCQs

Total Questions : 49 | Page 4 of 5 pages
Question 31. In a factory, two machines M1 and M2 manufacture 60% and 40% of the autocomponents
respectively. Out of the total production, 2% of M1 and 3% of M2 are found to be defective. If a
randomly drawn autocomponent from the combined lot is found defective, what is the probability
that it was manufactured by M2?
  1.    0.35
  2.    0.45
  3.    0.5
  4.    0.4
 Discuss Question
Answer: Option C. -> 0.5


-NA-


Question 32. All professors are researchers Some scientists are professors Which of the given conclusions is logically valid and is inferred from the above arguments:
  1.    All scientists are researchers
  2.    All professors are scientists
  3.    Some researchers are scientists
  4.    No conclusion follows
 Discuss Question
Answer: Option C. -> Some researchers are scientists


-NA-


Question 33. If |-2X + 9| = 3 then the possible value of |-X| - X2 would be:
  1.    30
  2.    -30
  3.    -42
  4.    42
 Discuss Question
Answer: Option B. -> -30


-NA-


Question 34. The number of ways in which the letters in the word MINING can be arranged is
  1.    90
  2.    180
  3.    360
  4.    720
 Discuss Question
Answer: Option B. -> 180


-NA-


Question 35. An emulsion explosive of specific gravity 1.25 is used for blasting in an iron ore formation having
P-wave velocity of 3000 m/s and specific gravity of 3.20. For an explosive impedance to rock
impedance ratio of 0.5, the desired velocity of detonation of the explosive in m/s is
  1.    3840
  2.    4000
  3.    4200
  4.    7680
 Discuss Question
Answer: Option A. -> 3840


-NA-


Question 36. Among the following options, the specific energy for rock-drilling is lowest in
  1.    rotary diamond drilling
  2.    rotary roller drilling
  3.    percussive drilling
  4.    jet piercing
 Discuss Question
Answer: Option C. -> percussive drilling


-NA-


Question 37. Identify the correct statement for a 'normal distribution'.
  1.    Mean is greater than mode but less than median
  2.    Mean is less than mode but greater than median
  3.    Mean is greater than mode and median
  4.    Mean, median and mode are equal
 Discuss Question
Answer: Option D. -> Mean, median and mode are equal


-NA-


Question 38. Events A and B are independent but NOT mutually exclusive. If the probabilities P(A) and P(B) are
0.5 and 0.4 respectively, then P(A ∪ B) is
  1.    0.6
  2.    0.7
  3.    0.8
  4.    0.9
 Discuss Question
Answer: Option B. -> 0.7


-NA-


Question 39. A 20 m steel tape used in a mine survey is found to be 20 cm short when compared with a standard
tape. If the measured volume of a dump using the tape is 4000 m3, its actual volume in m3 is
  1.    3881
  2.    3902
  3.    3920
  4.    4121
 Discuss Question
Answer: Option A. -> 3881


-NA-


Question 40. A mine worker inhales normal air; whereas, the exhaled air contains 16.65% O2 and 3.83% CO2.
The respiratory quotient of breathing for the worker is
  1.    0.23
  2.    0.89
  3.    0.99
  4.    1.13
 Discuss Question
Answer: Option B. -> 0.89


-NA-


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