IIT JEE Practice Question and Answer

Q: What is to be replaced in place of '?' in the following series ?  A2BC, ?, ABC4, A5BC 6182 0

  • 1
    A3BC
    Correct
    Wrong
  • 2
    ABC3
    Correct
    Wrong
  • 3
    AB3C
    Correct
    Wrong
  • 4
    A2B3C4
    Correct
    Wrong
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Answer : 3. "AB3C"
Explanation :

Answer: C) Option C Explanation: Because the letters are the same, concentrate on the number series, which is a simple 2, 3, 4, 5, 6 series, and follows each letter in order.

Q: Find the odd number out of the following number series? 2 4 8 11.5 18.25 28.375 6177 0

  • 1
    18.25
    Correct
    Wrong
  • 2
    28.375
    Correct
    Wrong
  • 3
    11.5
    Correct
    Wrong
  • 4
    8
    Correct
    Wrong
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Answer : 4. "8"
Explanation :

Answer: D) 8 Explanation: Given number series follows a pattern that, 2 2 x 1.5 + 1 = 4 4 x 1.5 + 1 = 7 (not equal to 8) 7 x 1.5 + 1 = 11.5 11.5 x 1.5 + 1 = 18.25 18.25 x 1.5 + 1 = 28.375   Hence, the odd number in the given number series is 8.

Q: The process of collecting, organizing and analyzing data is called 6159 0

  • 1
    Statistics
    Correct
    Wrong
  • 2
    Data collection
    Correct
    Wrong
  • 3
    Probability
    Correct
    Wrong
  • 4
    Systematic evaluation
    Correct
    Wrong
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Answer : 1. "Statistics"
Explanation :

Answer: A) Statistics Explanation: The process of collecting, organizing and analyzing data is called Statistics.

Q: Off-duty risk decisions are 6154 0

  • 1
    Dictated by the Department of the Army
    Correct
    Wrong
  • 2
    The responsibility of individual Soldiers
    Correct
    Wrong
  • 3
    Made by leaders and commanders
    Correct
    Wrong
  • 4
    Not a consideration
    Correct
    Wrong
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Answer : 2. "The responsibility of individual Soldiers"
Explanation :

Answer: B) The responsibility of individual Soldiers Explanation: Risk Management : A decision-making process for identifying hazards and controlling risks both on-duty and off-duty is called a Risk Management (RM).   Hence, Off-duty risk decisions are the responsibility of individual Soldiers.

Q: Three persons A, B and C are standing in a queue. There are five persons between A and B and eight persons between B and C. If there be three persons ahead of C and 21 persons behind A, what could be the minimum number of persons in the queue? 6078 0

  • 1
    41
    Correct
    Wrong
  • 2
    40
    Correct
    Wrong
  • 3
    28
    Correct
    Wrong
  • 4
    27
    Correct
    Wrong
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Answer : 3. "28"
Explanation :

Answer: C) 28 Explanation: Three persons A, B, C can be arranged in a queue in six different ways, ie ABC, CBA, BAC, CAB, BCA, ACB. But since there are only 3 persons ahead of C, so C should be in front of the queue. Thus, there are only two possible arrangements, ie CBA and CAB.   We may consider the two cases as under: Case I:  ←3C↔8B↔5A→21   Clearly, number of persons in the queue = (3+1+8+1+5+1+21=) 40   Case II:  ←3C A↔5B   Number of persons between A and C                     = (8 - 6) = 2    ∵[C↔8B A→21B]   Clearly number of persons in the queue = (3+1+2+1+21) = 28   Now, 28 < 40. So, 28 is the minimum number of persons in the queue.

Q: Boy, man, uncle, fireman, grandfather are... 6077 0

  • 1
    Feminine titles
    Correct
    Wrong
  • 2
    Masculine titles
    Correct
    Wrong
  • 3
    Both Feminine and Masculine titles
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
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Answer : 2. "Masculine titles"
Explanation :

Answer: B) Masculine titles Explanation: As they are the titles of male gender, they are called as Masculine titles.

Q: Amar can do a piece of work in 10 days. He works at it for 4 days and then Arun finishes it in 9 days. In how many days can Amar and Arun together finish the work ? 6070 0

  • 1
    4 days
    Correct
    Wrong
  • 2
    8 days
    Correct
    Wrong
  • 3
    3 days
    Correct
    Wrong
  • 4
    6 days
    Correct
    Wrong
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Answer : 4. "6 days"
Explanation :

Answer: D) 6 days Explanation: 4/10 + 9/x = 1     => x = 15    Then both can do in  1/10 + 1/15 = 1/6     => 6 days

Q: What is the number of digits in 333? Given that log3 = 0.47712? 6069 0

  • 1
    12
    Correct
    Wrong
  • 2
    13
    Correct
    Wrong
  • 3
    14
    Correct
    Wrong
  • 4
    15
    Correct
    Wrong
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Answer : 2. "13"
Explanation :

Answer: B) 13 Explanation:  Let   Let x=333 = 333    Then, logx = 33 log3     = 27 x 0.47712 = 12.88224    Since the characteristic in the resultant value of log x is 12   ∴The number of digits in x is (12 + 1) = 13    Hence the required number of digits in 333is 13.

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