IIT JEE Practice Question and Answer

Q: When was Judaism founded? 1545 0

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Answer :
Explanation :

Judaism is one of the oldest monotheistic religions and was founded over 3500 years ago in the Middle East.   Jews believe that God appointed the Jews to be his chosen people in order to set an example of holiness and ethical behaviour to the world.

Q: Why is india called bharat? 1545 0

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Answer :
Explanation :

The name Bharat is derived from the legendary king Bharat who was ancestor of kauravas and pandavas, son of King Dushyanta and Shakuntala. The name India is derived from the river Sindhu which flows in the north west of the country. The Greeks used to call us Indoi meaning the people of the Indus.

Q: Which of the following is a Non Renewable Resource of Energy? 1544 0

  • 1
    Wind Power
    Correct
    Wrong
  • 2
    Hydrogen Fuel
    Correct
    Wrong
  • 3
    Natural Gas
    Correct
    Wrong
  • 4
    Solar Energy
    Correct
    Wrong
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Answer : 3. "Natural Gas"
Explanation :

Answer: C) Natural Gas Explanation: Natural Gas is a Non Renewable Resource of Energy because that does not renew itself once used, unlike the other choices.  It is a resource that will not be naturally replenished.

Q: A train covered k km at 40 kmph and another 2k km at 20 kmph. Find the average speed of the train in covering the entire 3k km ? 1543 0

  • 1
    28 kmph
    Correct
    Wrong
  • 2
    24 kmph
    Correct
    Wrong
  • 3
    26 kmph
    Correct
    Wrong
  • 4
    32 kmph
    Correct
    Wrong
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Answer : 2. "24 kmph"
Explanation :

Answer: B) 24 kmph Explanation: Total time taken = k/40 + 2k/20 hours = 5k/40 = k/8 hours Average speed = 3k/(k/8) = 24 kmph.

Q: The average salinity of seawater is 1543 0

  • 1
    35%
    Correct
    Wrong
  • 2
    3.5%
    Correct
    Wrong
  • 3
    3%
    Correct
    Wrong
  • 4
    2.5%
    Correct
    Wrong
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Answer : 2. "3.5%"
Explanation :

Answer: B) 3.5% Explanation: Seawater or salt water is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of approximately 3.5% or 35 parts per thousand. This means that for every 1 litre (1000 mL) of seawater there are 35 grams of salts dissolved in it.   Hence, The average salinity of seawater is 3.5%.

Q: In a certain office, 1/3 of workers are women, 1/2 of the women are married and 1/3 of the married women have children. If 3/4  of the men are married and 2/3  of the married men have children, what part of the workers are without children? 1543 0

  • 1
    5/18
    Correct
    Wrong
  • 2
    4/9
    Correct
    Wrong
  • 3
    11/18
    Correct
    Wrong
  • 4
    17/36
    Correct
    Wrong
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Answer : 3. "11/18"
Explanation :

Answer: C) 11/18 Explanation: Let the total number of workers be x. Then,    Number of women = x/3 and number of men = x - x/3  = 2x/3   Number of women having children = x/18   Number of men having children = x/3   Number of workers having children = (x/18) + (x/3) = 7x/18    Therefore, workers having no children = x - 7x/18 = 11/18 of all workers.

Q: Find the Missing number in the given Series ?   2, 3, 6, 15, ? , 157.5 1543 0

  • 1
    87
    Correct
    Wrong
  • 2
    78.5
    Correct
    Wrong
  • 3
    56.5
    Correct
    Wrong
  • 4
    45
    Correct
    Wrong
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Answer : 4. "45"
Explanation :

Answer: D) 45 Explanation: Here given  2, 3, 6, 15, ? , 157.5 2 x 1.5 = 3 3 x 2  = 6 6 x 2.5 = 15 15 x 3 = 45 45 x 3.5 = 157.5 Therefore, the missing number is 45

Q: What is meant by demography? 1542 0

  • 1
    The well being of populations
    Correct
    Wrong
  • 2
    Growth of population
    Correct
    Wrong
  • 3
    Birth and death of population
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: The study of statistics such as births, deaths, income, or the incidence of disease, which illustrate the changing structure of human populations.   In brief, Study of both quantitative and qualitative aspects of human population. 1. Quantitative aspects include composition, density, distribution, growth, movement, size, and structure of the population. 2. Qualitative aspects are the sociological factors such as education quality, crime, diet, development, nutrition, wealth and well being.

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