IIT JEE Practice Question and Answer

Q: Who proved that microorganisms cause disease? 1667 0

  • 1
    van Leeuwenhoek
    Correct
    Wrong
  • 2
    Koch
    Correct
    Wrong
  • 3
    Fleming
    Correct
    Wrong
  • 4
    Pasteur
    Correct
    Wrong
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Answer : 2. "Koch"
Explanation :

Answer: B) Koch Explanation:

Q: Which of the following is true about blood plasma? 1666 0

  • 1
    The main protein component is hemoglobin.
    Correct
    Wrong
  • 2
    It is a faint yellow fluid.
    Correct
    Wrong
  • 3
    It is the same as serum but without the clotting proteins.
    Correct
    Wrong
  • 4
    It is about 90% water.
    Correct
    Wrong
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Answer : 4. "It is about 90% water."
Explanation :

Answer: D) It is about 90% water. Explanation: The first option is incorrect because it is devoid of blood cell, also red blood cells so doesn’t contains haemoglobin. The second option is incorrect because plasma is colorless. The third option is also incorrect because plasma contains the clotting factors.

Q: What is the currency of Mexico ? 1666 0

  • 1
    Krones
    Correct
    Wrong
  • 2
    Lira
    Correct
    Wrong
  • 3
    Peso
    Correct
    Wrong
  • 4
    Mexican dollars
    Correct
    Wrong
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Answer : 3. "Peso"
Explanation :

Answer: C) Peso Explanation:

Q: Transcription occurs in the 1666 0

  • 1
    DNA
    Correct
    Wrong
  • 2
    Cytoplasm
    Correct
    Wrong
  • 3
    Chromosomes
    Correct
    Wrong
  • 4
    Nucleus
    Correct
    Wrong
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Answer : 4. "Nucleus"
Explanation :

Answer: D) Nucleus Explanation: In the cell, transcription occurs in the nucleus in the presence of DNA. Terms transcription and translation in biology are generally related to the DNA and its properties. Human cells replicate. In order to do that, they have to produce the same constituents for the new cell that is to be made. The only way to do that is by producing proteins. The proteins are produced in the process that is called protein synthesis. The first step is in the nucleus where a particular gene is being expressed so it enables all protein factors to come and to replicate that part of a chromosome. This is finished when mRNA, the same single-stranded genetic code of a particular gene, is formed. This is transcription. Right after that, the mRNA enters the cytoplasm through nuclear pores. There, it could be translated into proteins by ribosomes. This process is called translation.   Hence, Transcription occurs in the nucleus, whereas translation occurs in the cytoplasm.

Q: A hybrid of a donkey and a horse 1666 0

  • 1
    Panthera and Mule
    Correct
    Wrong
  • 2
    Mules and Hinnys
    Correct
    Wrong
  • 3
    Liger and Hinnys
    Correct
    Wrong
  • 4
    Wholphin and Mule
    Correct
    Wrong
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Answer : 2. "Mules and Hinnys"
Explanation :

Answer: B) Mules and Hinnys Explanation: Donkeys and horses can be breed to make mules and hinnys. A hinny is a domestic equine hybrid that is the offspring of a male horse, a stallion, and a female donkey, a jenny. It is the reciprocal cross to the more common mule, which is the product of a male donkey, a jack, and a female horse, a mare.

Q: Nucleus of Hydrogen atom consists of 1665 0

  • 1
    2 protons only
    Correct
    Wrong
  • 2
    2 neutrons only
    Correct
    Wrong
  • 3
    1 proton only
    Correct
    Wrong
  • 4
    1 electron only
    Correct
    Wrong
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Answer : 3. "1 proton only"
Explanation :

Answer: C) 1 proton only Explanation: The nucleus of hydrogen consists of only a single proton. Its parts are a single negatively-charged electron that circles a single positively-charged nucleus of the hydrogen atom. The electron is bound to the nucleus by the Coulomb force.

Q: Which technology is used in compact disks? 1665 1

  • 1
    Laser
    Correct
    Wrong
  • 2
    Mechanical
    Correct
    Wrong
  • 3
    Electrical
    Correct
    Wrong
  • 4
    Electro magnetic
    Correct
    Wrong
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Answer : 1. "Laser"
Explanation :

Answer: A) Laser Explanation: Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982.  These are actually made to replace floppy disks that were used to store files and programs from the computer.   The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD-ROM).   These CD's uses Laser technology.

Q: A jogger running at 9 kmph alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 kmph in the same direction. In how much time will the train pass the jogger  ? 1664 0

  • 1
    10 sec
    Correct
    Wrong
  • 2
    48 sec
    Correct
    Wrong
  • 3
    36 sec
    Correct
    Wrong
  • 4
    56 sec
    Correct
    Wrong
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Answer : 3. "36 sec"
Explanation :

Answer: C) 36 sec Explanation: Given speed of jogger = 9 kmph Speed of train = 45 kmphAs they are in same direction, Relative speed = 45 - 9 = 36 kmph = 36x5/18 = 10 m/sDistance = 240 + 120 = 360 mts Time = distance/speed = 360/10 = 36 sec.

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