IIT JEE Practice Question and Answer

Q: First Indian woman to participate in Olympics? 3950 0

  • 1
    Karnam Malleswari
    Correct
    Wrong
  • 2
    Mary Kom
    Correct
    Wrong
  • 3
    P.V. Sindhu
    Correct
    Wrong
  • 4
    Geeta Phogat
    Correct
    Wrong
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Answer : 1. "Karnam Malleswari"
Explanation :

Answer: A) Karnam Malleswari Explanation: The first Indian woman to ever win an Olympic medal was Karnam Malleswari who won a bronze medal at the Sydney Olympics in the Women's 69 kg category in Weightlifting.

Q: Which is a green planet in the solar system? 3935 0

  • 1
    Pluto
    Correct
    Wrong
  • 2
    Venus
    Correct
    Wrong
  • 3
    Uranus
    Correct
    Wrong
  • 4
    Mars
    Correct
    Wrong
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Answer : 3. "Uranus"
Explanation :

Answer: C) Uranus Explanation: Uranus is the seventh planet from the Sun which looks green color. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both have different bulk chemical composition from that of the larger gas giants Jupiter and Saturn.   Colors of other planets:: Mercury - Gray or slightly brownish Venus - Pale yellow Earth - Blue with white clouds Mars - Mostly reddish brown Jupiter - Orange and white bands Saturn - Pale gold Uranus - Green Neptune - Pale blue Pluto - Light brown

Q: Fresh grapes contain 60% water, while dry grapes contain 40% water. How many kgs of dry grapes can be obtained by 60 kg of fresh grapes? 3933 0

  • 1
    25 kgs
    Correct
    Wrong
  • 2
    30 kgs
    Correct
    Wrong
  • 3
    35 kgs
    Correct
    Wrong
  • 4
    40 kgs
    Correct
    Wrong
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Answer : 4. "40 kgs"
Explanation :

Answer: D) 40 kgs Explanation: The fruit content in both the fresh fruit and dry fruit is the same. Let 'p' kgs of dry grapes are obtained from the 60 kgs of fresh grapes   => 60 x 40100 = p x 60100=> p = 40 kgs.   Therefore, 40 kgs of Dry grapes are obtained from 60 kgs of Fresh grapes.

Q: A man swims downstream 72 km and upstream 45 km taking 9 hours each time; what is the speed of the current  ? 3924 0

  • 1
    1 kmph
    Correct
    Wrong
  • 2
    3.2 kmph
    Correct
    Wrong
  • 3
    1.5 kmph
    Correct
    Wrong
  • 4
    2 kmph
    Correct
    Wrong
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Answer : 3. "1.5 kmph"
Explanation :

Answer: C) 1.5 kmph Explanation: 72 --- 9 ? ---- 1 => Down Stream = 8 45 ---- 9 ? ---- 1 => Up Stream = 5 Speed od current S = ? S = (8 - 5)/2 = 1.5 kmph.

Q: Which of the following is a micro nutrient? 3919 0

  • 1
    Mg
    Correct
    Wrong
  • 2
    Cl
    Correct
    Wrong
  • 3
    P
    Correct
    Wrong
  • 4
    Ca
    Correct
    Wrong
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Answer : 2. "Cl"
Explanation :

Answer: B) Cl Explanation: The micronutrients (or trace minerals): boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni). and cobalt (Co).

Q: When is genetic drift a major factor in evolution? 3912 0

  • 1
    When there is male competition
    Correct
    Wrong
  • 2
    When there is artificial selection
    Correct
    Wrong
  • 3
    When there is no selective pressure
    Correct
    Wrong
  • 4
    When there is disruptiveselection
    Correct
    Wrong
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Answer : 3. "When there is no selective pressure"
Explanation :

Answer: C) When there is no selective pressure Explanation: Genetic drift or allelic drift is the change in the relative frequency in which a gene variant (allele) occurs in a population due to random sampling and chance.   When is genetic drift a major factor in evolution is * When there is low gene flow. * When there is no selective pressure. * When there is a bottleneck.

Q: Which of the following is not an allotrope of carbon? 3897 0

  • 1
    Diamond
    Correct
    Wrong
  • 2
    Graphene
    Correct
    Wrong
  • 3
    Ethylene
    Correct
    Wrong
  • 4
    Buckminsterfullerene
    Correct
    Wrong
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Answer : 3. "Ethylene"
Explanation :

Answer: C) Ethylene Explanation: Allotropes are different structural modifications of an element, that is, each of two or more different physical forms in which an element can exist.   Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include charcoal, diamond, graphite, buckminsterfullerene and graphene.   Hence, Ethylene is not an allotrope of Carbon.

Q: The ratio of two positive numbers is 3 : 5 and the average of the number is 48. What is the product of numbers? 3897 1

  • 1
    3365
    Correct
    Wrong
  • 2
    2160
    Correct
    Wrong
  • 3
    1854
    Correct
    Wrong
  • 4
    1632
    Correct
    Wrong
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Answer : 2. "2160"
Explanation :

Answer: B) 2160 Explanation: Let the number be 3p and 5p ATQ, 8p = 2 x 48 p = 96/8 p = 12   The numbers are 36 and 60.   Hence, the product of the numbers = 36 x 60 = 2160.

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