IIT JEE Practice Question and Answer

Q: In how many different ways could couples be picked from 6 men and 9 women ? 1417 0

  • 1
    26
    Correct
    Wrong
  • 2
    54
    Correct
    Wrong
  • 3
    52
    Correct
    Wrong
  • 4
    28
    Correct
    Wrong
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Answer : 2. "54"
Explanation :

Answer: B) 54 Explanation: Number of mens = 8 Number of womens = 5   Different ways could couples be picked = C16× 9C1 = 9 x 6 = 54 ways.

Q: The term 'fourth estate' is used in reference to 1416 0

  • 1
    The Executive
    Correct
    Wrong
  • 2
    The Press and news paper
    Correct
    Wrong
  • 3
    Parliament
    Correct
    Wrong
  • 4
    The Judiciary
    Correct
    Wrong
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Answer : 2. "The Press and news paper"
Explanation :

Answer: B) The Press and news paper Explanation: Thomas Carlyle attributed the origin of the term to Edmund Burke, who used it in a parliamentary debate in 1787 on the opening up of press reporting of the House of Commons of Great Britain.

Q: If two dice are thrown together, the probability of getting an even number on one die and an odd number on the other is  ? 1414 0

  • 1
    1
    Correct
    Wrong
  • 2
    1/2
    Correct
    Wrong
  • 3
    0
    Correct
    Wrong
  • 4
    3/5
    Correct
    Wrong
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Answer : 2. "1/2"
Explanation :

Answer: B) 1/2 Explanation: The number of exhaustive outcomes is 36.Let E be the event of getting an even number on one die and an odd number on the other. Let the event of getting either both even or both odd then = 18/36 = 1/2P(E) = 1 - 1/2 = 1/2.

Q: IG full form in police department? 1414 0

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Answer :
Explanation :

IG stands for Inspector General of Police. DIG(Deputy Inspector General ofPolice) is a One-star rank in the police service who works under IG.

Q: Everyone has it and no one can lose it. What is it? 1412 0

  • 1
    Face
    Correct
    Wrong
  • 2
    Teeth
    Correct
    Wrong
  • 3
    Hair
    Correct
    Wrong
  • 4
    Shadow
    Correct
    Wrong
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Answer : 4. "Shadow"
Explanation :

Answer: D) Shadow Explanation:

Q: Which of the following is a false statement? 1409 0

  • 1
    As bond order increases the strength of the bond increases
    Correct
    Wrong
  • 2
    Bond order is proportional to the bond length
    Correct
    Wrong
  • 3
    Molecules with negative bond order are highly unstable
    Correct
    Wrong
  • 4
    Bond order is inversely proportional to the bond length
    Correct
    Wrong
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Answer : 2. "Bond order is proportional to the bond length"
Explanation :

Answer: B) Bond order is proportional to the bond length Explanation: Bond order is proportional to the bond length is a False statement since Bond order is inversely proportional to the bond length.

Q: As per the decision of the GST Council, e-Way Bill system has been rolled out from 1408 0

  • 1
    1st March 2018
    Correct
    Wrong
  • 2
    1st April 2018
    Correct
    Wrong
  • 3
    1st May 2018
    Correct
    Wrong
  • 4
    1st January 2018
    Correct
    Wrong
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Answer : 2. "1st April 2018"
Explanation :

Answer: B) 1st April 2018 Explanation: As per the decision of the GST Council, e-Way Bill system has been rolled out from 1st of April this year (2018).

Q: A can do a work in 9 days, B can do a work in 7 days, C can do a work in 5 days. A works on the first day, B works on the second day and C on the third day respectively that is they work on alternate days. When will they finish the work ? 1408 0

  • 1
    [7 + (215/345)] days
    Correct
    Wrong
  • 2
    [6 + (11/215)] days
    Correct
    Wrong
  • 3
    [6 + (261/315)] days
    Correct
    Wrong
  • 4
    [5 + (112/351)] days
    Correct
    Wrong
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Answer : 3. "[6 + (261/315)] days"
Explanation :

Answer: C) [6 + (261/315)] days Explanation: After day 1, A finishes 1/9 of the work. After day 2, B finishes 1/7 more of the total work. (1/9) + (1/7) is finished. After day 3, C finishes 1/5 more of total work. Total finished is 143/315. So, after day 6, total work finished is 286/315.   Now remaining work =  29 /315   On day 7, A will work again    Work will be completed on day 7 when A is working. He must finish 29/315 of total remaining work.   Since he takes 9 days to finish the total task, he will need 261/315 of the day.    Total days required is 6 + (261/315) days.

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