IIT JEE Practice Question and Answer

Q: What is the missing number in 5, 14, 42, 107, 233, ? 3679 0

  • 1
    316
    Correct
    Wrong
  • 2
    384
    Correct
    Wrong
  • 3
    450
    Correct
    Wrong
  • 4
    479
    Correct
    Wrong
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Answer : 3. "450"
Explanation :

Answer: C) 450 Explanation: Given Series is 5, 14, 42, 107, 233, _? 5, 14, 42, 107, 233, _? Differences is 9, 28, 65, 126 9 = 2^3 + 1 28 = 3^3 + 1 65 = 4^3 + 1 126 = 5^3 + 1 Now, next difference must be 6^3 + 1 = 217 Hence, next number in the given series = 233 + 217 = 450.

Q: Tract of land used for raising crops or livestock. 3669 0

  • 1
    A field
    Correct
    Wrong
  • 2
    A farm
    Correct
    Wrong
  • 3
    Both A & B
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
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Answer : 3. "Both A & B"
Explanation :

Answer: C) Both A & B Explanation: A tract of land used for raising crops or livestockcan be called a field or a farm.

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Answer : 2. "2 x (18!)"
Explanation :

Answer: B) 2 x (18!) Explanation: A person can be chosen out of 18 people in 18 ways to be seated between Musharraf and Manmohan. Now consider Musharraf, Manmohan, and the third person, sitting between them, as a single personality, we can arrange them in 17! ways but Musharraf and Manmohan can also be arranged in 2 ways.    Required number of permutations = 18 x (17!) x 2 = 2 x 18!

Q: Find the next number in the given number series? 50, 51, 47, 56, 40, ? 3661 0

  • 1
    58
    Correct
    Wrong
  • 2
    65
    Correct
    Wrong
  • 3
    76
    Correct
    Wrong
  • 4
    81
    Correct
    Wrong
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Answer : 2. "65"
Explanation :

Answer: B) 65 Explanation: The given number series is 50, 51, 47, 56, 40, ?   5050 + 12 = 5151 - 22 = 4747 + 32 = 5656 - 42 = 4040 + 52 = 65   Hence, the next number in the given number series is 65.

Q: A person sold two cows each for Rs.9900. If he gained 10% on one and lost 20% on the other, then which of the following is true ? 3657 0

  • 1
    He lost Rs. 200
    Correct
    Wrong
  • 2
    He gained Rs. 200
    Correct
    Wrong
  • 3
    Neither he gained nor lost
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
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Answer : 4. "None of the above"
Explanation :

Answer: D) None of the above Explanation: In first he got Rs. 990 But in second he lost Rs. 1980 So he lost Rs. 990.

Q: Why are yeast cells frequently used as hosts for cloning? 3657 0

  • 1
    they are eukaryotic cells
    Correct
    Wrong
  • 2
    they do not have plasmids
    Correct
    Wrong
  • 3
    only yeast cells allow the gene to be cloned
    Correct
    Wrong
  • 4
    they easily form colonies
    Correct
    Wrong
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Answer : 1. "they are eukaryotic cells"
Explanation :

Answer: A) they are eukaryotic cells Explanation: If you were to produce a protein in bacterial cloning systems, you would not get the same post transcriptional and post translational modifications because the prokaryotic and eukaryotic systems work differently on the modifications. Thus human recombinant protein genes are usually cloned in yeast cells. Also since they have a short generation time, they can be easily culture.

Q: What base is found in RNA but not in DNA? 3650 0

  • 1
    Uracil
    Correct
    Wrong
  • 2
    Cytosine
    Correct
    Wrong
  • 3
    Adenine
    Correct
    Wrong
  • 4
    Guanine
    Correct
    Wrong
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Answer : 1. "Uracil"
Explanation :

Answer: A) Uracil Explanation: Uracil is not found in DNA but found in RNA.

Q: 18 H on GC?


 $$6 {4\over 9}$$ % ..???kkk

3646 0

  • 1
    ss
    Correct
    Wrong
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Answer : 1. "ss"
Explanation :

The given letters equation states that 18 H on a GC means 18 Holes on a Golf Course.

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