IIT JEE Practice Question and Answer

Q: Which of the following elements has the highest electronegativity? 1357 0

  • 1
    Chlorine
    Correct
    Wrong
  • 2
    Bromine
    Correct
    Wrong
  • 3
    Fluorine
    Correct
    Wrong
  • 4
    Helium
    Correct
    Wrong
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Answer : 3. "Fluorine"
Explanation :

Answer: C) Fluorine Explanation: Electronegativity refers to the ability of an atom to attract shared electrons in a covalent bond. The higher the value of the electronegativity, the more strongly that element attracts the shared electrons. Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element and lithium is the least.

Q: Carbohydrates, lipids and proteins are classified as 1248 0

  • 1
    Macromolecules
    Correct
    Wrong
  • 2
    Biomolecules
    Correct
    Wrong
  • 3
    Macronutrients
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: Carbohydrates, together with lipids, proteins and nucleic acids, are one of the four major classes of biologically essential organic molecules found in all living organisms. They not only provide energy for vital metabolic reactions but also supply the building materials for normal structure, growth and repair. Your body needs relatively large quantities of carbohydrates, fats and protein for optimal function, hence their classification as macronutrients.

Q: Which colony was farthest north? 1284 0

  • 1
    Massachusetts
    Correct
    Wrong
  • 2
    Virginia
    Correct
    Wrong
  • 3
    Georgia
    Correct
    Wrong
  • 4
    New Hampshire
    Correct
    Wrong
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Answer : 1. "Massachusetts"
Explanation :

Answer: A) Massachusetts Explanation: There are 13 colonies and are ruled by England.   The farthest north colony - Massachusetts The farthest south colony - Georgia The oldest colony - Virginia The colony between the 2 parts of Massachusetts - New Hampshire

Q: Which best summarizes the concept of natural selection? 2089 0

  • 1
    the fittest organisms survive and reproduce
    Correct
    Wrong
  • 2
    an organism will always adapt to its environment
    Correct
    Wrong
  • 3
    an organism will always mutate to survive
    Correct
    Wrong
  • 4
    a mutation always makes a species fitter
    Correct
    Wrong
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Answer : 1. "the fittest organisms survive and reproduce"
Explanation :

Answer: A) the fittest organisms survive and reproduce Explanation: Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

Q: Sandalwood is largely found in 1651 0

  • 1
    India
    Correct
    Wrong
  • 2
    Japan
    Correct
    Wrong
  • 3
    China
    Correct
    Wrong
  • 4
    Nepal
    Correct
    Wrong
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Answer : 1. "India"
Explanation :

Answer: A) India Explanation: Sandalwood is largely found in India and they are government owned and their harvest is controlled.   Naturally grown sandalwood can be easily found in Karnataka, Tamilnadu, Andhra, Kerala, Gujarat, Madhya Pradesh, and U.P. Manipura and in some other states of India.

Q: What always works with something in its eye? 1124 0

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Answer :
Explanation :

A Needle works when it has thread in its eye that is in its tiny hole.

Q: Which best matches the description with the genetic material? 2424 0

  • 1
    Chromosomes are located in the cytoplasm.
    Correct
    Wrong
  • 2
    DNA is located in the nucleus.
    Correct
    Wrong
  • 3
    Nucleotides form a helical structure that is called a gene.
    Correct
    Wrong
  • 4
    Chromosomes create genes.
    Correct
    Wrong
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Answer : 2. "DNA is located in the nucleus."
Explanation :

Answer: B) DNA is located in the nucleus. Explanation: DNA is the genetic material in the cell.    Hence, option B) DNA is located in the nucleus best matches the description with the genetic material.

Q: What can be swallowed but can swallow you? 1276 0

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Answer :
Explanation :

Your Pride. Yes, you can swallow your pride or it can swallow you.

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