IIT JEE Practice Question and Answer

Q: Why is Golden Rice pale yellow in color? 1858 0

  • 1
    Rich in Beta-Carotene
    Correct
    Wrong
  • 2
    Rich in Phycobilins
    Correct
    Wrong
  • 3
    Rich in Chlorophyll
    Correct
    Wrong
  • 4
    None
    Correct
    Wrong
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Answer : 1. "Rich in Beta-Carotene"
Explanation :

Answer: A) Rich in Beta-Carotene Explanation: Golden Rice (Oryza sativa) denotes a genetically modified rice capable of biosynthesizing and accumulating β-carotene (provitamin A) in the endosperm, yielding a characteristic yellow color in the polished grains. Golden rice was developed to help cope with vitamin A deficiency, a problem that prevails in developing countries, affecting millions (Underwood, 2000; UNICEF, 2000). Vitamin A deficiency causes mortality and growth retardation in children and frequently impairs vision, leading to blindness. It also contributes indirectly to anemia by interfering with iron bioavailability.   The endosperm of Golden Rice (Oryza sativa) is yellow due to the accumulation of β-carotene (provitamin A) and xanthophylls. The product of the two carotenoid biosynthesis transgenes used in Golden Rice results in Pale Yellow color.

Q: How many Types of Soil in India? 1658 0

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    4
    Correct
    Wrong
  • 2
    5
    Correct
    Wrong
  • 3
    7
    Correct
    Wrong
  • 4
    8
    Correct
    Wrong
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Answer : 4. "8"
Explanation :

Answer: D) 8 Explanation: There are 8 different types of Soils present in India. They are primarily differentiated on the basis of composition and structure. They are :: 1.  Alluvial soils,  2.  Black soils, 3.  Red soils, 4.  Laterite and Lateritic soils, 5.  Forest and Mountain soils, 6.  Arid and Desert soils, 7.  Saline and Alkaline soils and 8.  Peaty and Marshy soils.

Q: Expansion cards are inserted into 2551 0

  • 1
    Peripheral Devices
    Correct
    Wrong
  • 2
    Pegs
    Correct
    Wrong
  • 3
    Slots
    Correct
    Wrong
  • 4
    The back of the computer
    Correct
    Wrong
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Answer : 3. "Slots"
Explanation :

Answer: C) Slots Explanation: In computing, the expansion card or board or accessory card is a printed circuit board that can be inserted into an electrical connector or expansion slot, on a computer motherboard, to add functionality to a computer system via the expansion bus.

Q: Which State has been declared as the Open Defecation Free state? 1516 0

  • 1
    Uttarakhand
    Correct
    Wrong
  • 2
    Arunachal Pradesh
    Correct
    Wrong
  • 3
    Maharashtra
    Correct
    Wrong
  • 4
    Uttar Pradesh
    Correct
    Wrong
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Answer : 2. "Arunachal Pradesh"
Explanation :

Answer: B) Arunachal Pradesh Explanation: Arunachal Pradesh State has been declared as the Open Defecation Free state.

Q: In how many ways can letter of the word RAILINGS arrange so that R and S always come together? 1508 0

  • 1
    1260
    Correct
    Wrong
  • 2
    2520
    Correct
    Wrong
  • 3
    5040
    Correct
    Wrong
  • 4
    1080
    Correct
    Wrong
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Answer : 3. "5040"
Explanation :

Answer: C) 5040 Explanation: The number of ways in which the letters of the word RAILINGS can be arranged such that R & S always come together is   Count R & S as only 1 space or letter so that RS or SR can be arranged => 7! x 2!   But in the word RAILINGS, I repeated for 2 times => 7! x 2!/2! = 7! ways = 5040 ways.

Q: A girl read 2/5 part of a book in 1st day, 34% in second day and remaining page in next two days. In two days she read equal number of page. If she read 52 pages on last day, then find out how many pages did the book contain? 1440 0

  • 1
    400
    Correct
    Wrong
  • 2
    376
    Correct
    Wrong
  • 3
    382
    Correct
    Wrong
  • 4
    356
    Correct
    Wrong
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Answer : 1. "400"
Explanation :

Answer: A) 400 Explanation: 1st day the girl read = 40% 2nd day she read = 34 % Remaining percentage of book = 100% - (40% +34%) = 26% But given last two days she read equal number of pages => Each day she read 26%/2 = 13% Last day she read 52 pages = 13% 13% = 52 1% = 4 => 100% = 400 Total pages in the book is 400.

Q: What are long chains of Carbon Molecules called 1904 0

  • 1
    Ribosomes
    Correct
    Wrong
  • 2
    Hydrocarbons
    Correct
    Wrong
  • 3
    Polymers
    Correct
    Wrong
  • 4
    None
    Correct
    Wrong
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Answer : 3. "Polymers"
Explanation :

Answer: C) Polymers Explanation: A small organic molecule (sugars or amino acids), several of which may be bonded together to form a chain called a polymer.

Q: What is the Formula for Volume? 1693 0

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Answer :
Explanation :

The formula to find the volume is given by just multiplying Length, Breadth and Height of that object.   Thus, V = L x B X H   Volume Formulae :    1. Volume of Cube of side 's' = s x s x s = s3  cubic units.    2. Volume of Cylinder = πR2h cubic units.   [Where R is Radius and h is height]

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