IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Why are yeast cells frequently used as hosts for cloning? 3452 0

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    they are eukaryotic cells
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    they do not have plasmids
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    only yeast cells allow the gene to be cloned
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    they easily form colonies
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उत्तर : 1. "they are eukaryotic cells"
व्याख्या :

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.

प्र: __________ कुकीज़ को क्षणिक कुकीज़ के रूप में भी जाना जाता है। 3451 5

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    दृढ़
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    दूसरा दल
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    सत्र
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    तृतीय पक्ष
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उत्तर : 3. "सत्र"
व्याख्या :

Answer: C) Session Explanation:

प्र: First Bank to introduce Credit Card in India 3450 0

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    HSBC Bank
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    ICICI Bank
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    State Bank of India
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    Central Bank of India
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उत्तर : 4. "Central Bank of India"
व्याख्या :

Answer: D) Central Bank of India Explanation:   First Bank to introduce Credit Card in India - Central Bank of India First Bank to introduce ATM  -  HSBC, 1987 First Bank to introduce Internet Banking - ICICI Bank First Bank to introduce Mutual Funds - State Bank of India

प्र: Tract of land used for raising crops or livestock. 3448 0

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    A field
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    A farm
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    Both A & B
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    None of the above
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उत्तर : 3. "Both A & B"
व्याख्या :

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

प्र: How is my father's brother's only sibling's mother related to my sister's only brother ? 3441 0

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    Neice
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    Aunt
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    Mother
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    Grand-mother
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उत्तर : 4. "Grand-mother"
व्याख्या :

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.

प्र: The study of Heavenly bodies is called 3441 0

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    Astronomy
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    Astrology
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    Astrophysics
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    Astronautics
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उत्तर : 1. "Astronomy"
व्याख्या :

Answer: A) Astronomy Explanation: Astronomy is the study of planets and heavenly bodies. Historically, astronomy has focused on observations of heavenly bodies. It is a close cousin to astrophysics. Succinctly put, astrophysics involves the study of the physics of astronomy and concentrates on the behavior, properties and motion of objects out there.

प्र: 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 ? 3439 0

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    Rs.14,000
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    Rs.12,000
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    Rs. 12,800
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    Rs. 15,000
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उत्तर : 2. "Rs.12,000"
व्याख्या :

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.

प्र: A 300m race is held between two players running 3m/s and 5m/s in swimming pool of 50m long. how many times the two player meet in opposite direction till the faster one completes the race ? 3425 0

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    3 times
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    4 times
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    5 times
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    2 times
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उत्तर : 1. "3 times"
व्याख्या :

Answer: A) 3 times Explanation: Let us assume A is the faster and B is slower, A takes 10s to finish a lap of 50 m, B takes 17s(approx) to finish a lap of 50 m.So at 11th sec A starts his 2nd lap by the time B will be in between so that is the first time they will meet each other, at 21st sec A starts his 3rd lap by the time B will be coming back to finish his 2nd lap. So that is the second time they meet in opposite. Then at 31st sec A will start his 4th lap by the time B would not even finish 2nd lap as he take 34(2*17) sec to finish 2 laps. So at 35th sec B will start his 3rd lap by the time A will be coming back to finish his 4th lap in the half way so they will meet 3rd time. At 41st sec A will start its fifth lap by the time B will be going to finish 3rd lap in same direction. At 50th second both will complete A's 5th lap and B's 3rd lap. So they will start next lap(A's 6th and B's 4th) from the same point in same direction. And A will finish the race after completing 300m(6*50) total distance and then they wont meet opposite to each other. So totally they met 3 times in opposite direction.

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