IIT JEE Practice Question and Answer

Q: Why are yeast cells frequently used as hosts for cloning? 3519 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: Find the odd one out of the following number series? 9 5 6 14 56 488 3516 0

  • 1
    56
    Correct
    Wrong
  • 2
    6
    Correct
    Wrong
  • 3
    14
    Correct
    Wrong
  • 4
    5
    Correct
    Wrong
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Answer : 1. "56"
Explanation :

Answer: A) 56 Explanation: The given number series follows a pattern that, 9 9 x 0.5 + 0.5 = 5 5 x 1 + 1 = 6 6 x 2 + 2 = 14 14 x 4 + 4 = 60 (not equals to 56) 60 x 8 + 8 = 488.   Hence, the odd one in the given number series is 56.

Q: How is my father's brother's only sibling's mother related to my sister's only brother ? 3509 0

  • 1
    Neice
    Correct
    Wrong
  • 2
    Aunt
    Correct
    Wrong
  • 3
    Mother
    Correct
    Wrong
  • 4
    Grand-mother
    Correct
    Wrong
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Answer : 4. "Grand-mother"
Explanation :

Answer: D) Grand-mother Explanation: My father's brother's only sibling is my father. My father's mother is my grandmother. My sister's only brother is myself. So she is my Grandmother.

Q: The value of a machine depreciates at the rate of 10% every year. It was purchased 3 years ago. If its present value is Rs. 8,748, its purchase price was ? 3509 0

  • 1
    Rs.14,000
    Correct
    Wrong
  • 2
    Rs.12,000
    Correct
    Wrong
  • 3
    Rs. 12,800
    Correct
    Wrong
  • 4
    Rs. 15,000
    Correct
    Wrong
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Answer : 2. "Rs.12,000"
Explanation :

Answer: B) Rs.12,000 Explanation: We have P = 8748, R = -10 and n = 3Therefore, the purchase price of the machine= P1+R100n= 87481-101003= 8748 x (100/90) x (100/90) x (100/90)= 12,000.   Therefore, the purchase price of the machine was Rs. 12,000.

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 ? 3503 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: Joel introduces Mary as the daughter of the only son of my father’s wife. How is Joel related to Mary ? 3502 0

  • 1
    Daughter
    Correct
    Wrong
  • 2
    Brother
    Correct
    Wrong
  • 3
    Son
    Correct
    Wrong
  • 4
    Father
    Correct
    Wrong
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Answer : 4. "Father"
Explanation :

Answer: D) Father Explanation: Resolving from the last , In the view of joel,My father’s wife – motherOnly son of mother – himself i.e. joelDaughter of john– daughter. So Joel is Father of Mary.

Q: Ayurveda Owes its Origin to 3496 0

  • 1
    Yajurveda
    Correct
    Wrong
  • 2
    Atharvaveda
    Correct
    Wrong
  • 3
    Rigveda
    Correct
    Wrong
  • 4
    Samaveda
    Correct
    Wrong
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Answer : 2. "Atharvaveda"
Explanation :

Answer: B) Atharvaveda Explanation: Ayurveda Owes its Origin to Atharvaveda.   The early history of ayurveda asserts that around 1500 BC, ayurveda's fundamental and applied principles got organised and enunciated. In this historical construction, Ayurveda traces its origins to the Vedas, Atharvaveda in particular, and is connected to Hindu religion. Atharvaveda (one of the four most ancient books of Indian knowledge, wisdom and culture) contains 114 hymns or formulations for the treatment of diseases. Ayurveda originated in and developed from these hymns. In this sense, ayurveda is considered by some to have divine origin. Indian medicine has a long history, and is one of the oldest organised systems of medicine. Its earliest concepts are set out in the sacred writings called the Vedas, especially in the metrical passages of the Atharvaveda.

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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!

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