Practice Question and Answer

Q: The average age of 7 boys is increased by 1 year when one of tem whose age is replaced by a girl. What is the age of the girl ? 2280 0

  • 1
    33 yrs
    Correct
    Wrong
  • 2
    27 yrs
    Correct
    Wrong
  • 3
    21 yrs
    Correct
    Wrong
  • 4
    29 yrs
    Correct
    Wrong
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Answer : 4. "29 yrs"
Explanation :

Answer: D) 29 yrs Explanation: Let the avg age of 7 boys be 'p' yearsLet the age of the girl be 'q' yearsFrom given data,The age of 7 boys = 7p yearsNow the new average = (p + 1) when 22 yrs is replaced by qNow the age of all 7 will become = 7(p + 1) yrsHence, 7p - 22 + q = 7(p + 1) yrs7p - 22 + q = 7p + 7q = 22 + 7 = 29 Therefore, the age of girl = q = 29 years.

Q: The highway transportation system is coordinated by 2280 0

  • 1
    Department of Transportation
    Correct
    Wrong
  • 2
    Your local police department
    Correct
    Wrong
  • 3
    The Department of Education
    Correct
    Wrong
  • 4
    The Internal Revenue Service
    Correct
    Wrong
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Answer : 1. "Department of Transportation"
Explanation :

Answer: A) Department of Transportation Explanation:

Q:

दिया है:
12, 20, 28 

2280 0

  • 1
    18, 30, 42
    Correct
    Wrong
  • 2
    7, 14, 28
    Correct
    Wrong
  • 3
    3, 15, 18
    Correct
    Wrong
  • 4
    18, 27, 72
    Correct
    Wrong
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Answer : 1. "18, 30, 42 "

Q: what is the gram formula mass of NH43PO4? 2280 0

  • 1
    139.54
    Correct
    Wrong
  • 2
    140.70
    Correct
    Wrong
  • 3
    149.08
    Correct
    Wrong
  • 4
    153.24
    Correct
    Wrong
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Answer : 3. "149.08"
Explanation :

Answer: C) 149.08 Explanation: The gram formula mass is nothing but molar mass.   Composition :   Symbol      Element       Atomic weight       Atoms          P         Phosphorus       30.973762               1       = 30.973         O         Oxygen             15.9994                  4       =  63.998         N         Nitrogen            14.0067                  3       =  42.020         H         Hydrogen          1.00794                  12      =  12.096     Total   =  30.973+63.998+42.020+12.096 = 149.087

Q: Find the odd one in the given series ? 5-20-25, 10-40-50, 4-15-24, 25-100-125 2280 0

  • 1
    4-15-24
    Correct
    Wrong
  • 2
    5-20-25
    Correct
    Wrong
  • 3
    10-40-50
    Correct
    Wrong
  • 4
    25-100-125
    Correct
    Wrong
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Answer : 1. "4-15-24"
Explanation :

Answer: A) 4-15-24 Explanation: In each term second two numbers are multiples of the first number. But in 4-15-24 15 is not multiple of 4.

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