IIT JEE Practice Question and Answer

Q: What number should replace the question mark? 125, 138, 164, ?, 255 2438 0

  • 1
    189
    Correct
    Wrong
  • 2
    197
    Correct
    Wrong
  • 3
    200
    Correct
    Wrong
  • 4
    203
    Correct
    Wrong
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Answer : 4. "203"
Explanation :

Answer: D) 203 Explanation: The given number series is 125,   138,   164,   ?,   255   125   125 + 13x1 = 138   138 + 13x2 = 164   164 + 13x3 = 203   203 + 13x4 = 255       Hence, the missing number in the series is 203.

Q: Which of the following statements about Woodrow Wilson is true? 2437 0

  • 1
    He wanted to place strict government controls on corporations.
    Correct
    Wrong
  • 2
    He overturned discriminatory laws against African Americans.
    Correct
    Wrong
  • 3
    He advocated eliminating the income tax.
    Correct
    Wrong
  • 4
    He opposed reforms to the banking system.
    Correct
    Wrong
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Answer : 1. "He wanted to place strict government controls on corporations."
Explanation :

Answer: A) He wanted to place strict government controls on corporations. Explanation: Woodrow Wilson was one of the major "Progressives" in American government and so 'He wanted to place strict government controls on corporations.'

Q: The top and bottom of a tower were seen to be at angles of depression 30° and 60° from the top of a hill of height 100 m. Find the height of the tower ? 2436 1

  • 1
    42.2 mts
    Correct
    Wrong
  • 2
    33.45 mts
    Correct
    Wrong
  • 3
    66.6 mts
    Correct
    Wrong
  • 4
    58.78 mts
    Correct
    Wrong
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Answer : 3. "66.6 mts"
Explanation :

Answer: C) 66.6 mts Explanation: From above diagramAC represents the hill and DE represents the tower Given that AC = 100 m angleXAD = angleADB = 30° (∵ AX || BD ) angleXAE = angleAEC = 60° (∵ AX || CE) Let DE = h Then, BC = DE = h, AB = (100-h) (∵ AC=100 and BC = h), BD = CE tan 60°=AC/CE => √3 = 100/CE =>CE = 100/√3 ----- (1) tan 30° = AB/BD => 1/√3 = 100−h/BD => BD = 100−h(√3)∵ BD = CE and Substitute the value of CE from equation 1 100/√3 = 100−h(√3) => h = 66.66 mts The height of the tower = 66.66 mts.

Q: Which one of the following began with the Dandi March ? 2435 0

  • 1
    Civil disobedience Movement
    Correct
    Wrong
  • 2
    Quit India Movement
    Correct
    Wrong
  • 3
    Non-Cooperation Movement
    Correct
    Wrong
  • 4
    Home rule Movement
    Correct
    Wrong
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Answer : 1. "Civil disobedience Movement"
Explanation :

Answer: A) Civil disobedience Movement Explanation:

Q: A box contains 90 screws each of 100 gms and 100 bolts each of 150 gms. If the entire box weighs 35.5 kg, then the weight of the empty box is ? 2435 0

  • 1
    10.5 kgs
    Correct
    Wrong
  • 2
    12 kgs
    Correct
    Wrong
  • 3
    9.6 kgs
    Correct
    Wrong
  • 4
    11.5 kgs
    Correct
    Wrong
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Answer : 4. "11.5 kgs"
Explanation :

Answer: D) 11.5 kgs Explanation: Screws weight = 90x100 = 9000gmsbolts weight = 100 x 150 = 15000gmsweight = screws + bolts => 24000 gms =>24 kgGiven entire box weight = 35.5kgempty box = entire box weight - weight => 35.5kg - 24kg => 11.5kgso the empty box is 11.5kg.

Q: I jump when i walk and sit when i stand, who am I? 2435 0

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Answer :
Explanation :

Kangaroo.

Q: What is scientific name of "Cotton"  ? 2434 0

  • 1
    Azadhirachta Indica
    Correct
    Wrong
  • 2
    Phaseolies auicus
    Correct
    Wrong
  • 3
    Gossypium Herbaceum
    Correct
    Wrong
  • 4
    Ficus Benghalensis
    Correct
    Wrong
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Answer : 3. "Gossypium Herbaceum"
Explanation :

Answer: C) Gossypium Herbaceum Explanation:

Q: Which best summarizes the concept of natural selection? 2431 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.

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