IIT JEE Practice Question and Answer

Q: Planets do not twinkle because 1946 0

  • 1
    Far distance
    Correct
    Wrong
  • 2
    Total internal reflection
    Correct
    Wrong
  • 3
    Refraction
    Correct
    Wrong
  • 4
    Near distance
    Correct
    Wrong
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Answer : 4. "Near distance"
Explanation :

Answer: D) Near distance Explanation: Stars twinkle because they’re so far away from Earth that when light from the stars passes through the atmosphere, it is bent countless times due to refraction, making it look like as if they were blinking. The sun and other planets doesn’t twinkle because it’s too close to Earth compared to other stars.

Q: Which must be true for metamorphism to occur? 1945 0

  • 1
    The parent rock must be in solid form.
    Correct
    Wrong
  • 2
    Tons of pressure must be applied.
    Correct
    Wrong
  • 3
    The process must take place underground.
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: Metamorphism is the change of minerals or geologic texture in pre-existing rocks, without the protolith melting into liquid magma. The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids.   The parent rock must be in solid form. Tons of pressure must be applied for metamorphism to happen. The process must take place underground.

Q: In a Certain Country 1/2 of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10 ? 1945 0

  • 1
    4
    Correct
    Wrong
  • 2
    6
    Correct
    Wrong
  • 3
    8
    Correct
    Wrong
  • 4
    10
    Correct
    Wrong
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Answer : 1. "4"
Explanation :

Answer: A) 4 Explanation: Let 1310 = x  => 3x = 10   Given that 125=3   Therefore, 52x = 10    => x = 10/3 = 4.

Q: Which of the following is a non metal that remains liquid at room temperature  ? 1945 0

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

Answer: C) Bromine Explanation:

Q: What color does yellow and green make? 1944 0

  • 1
    Lime
    Correct
    Wrong
  • 2
    Ocean mist
    Correct
    Wrong
  • 3
    Maroon
    Correct
    Wrong
  • 4
    Tangerine
    Correct
    Wrong
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Answer : 1. "Lime"
Explanation :

Answer: A) Lime Explanation: Yellow and green color mix make a Lime color.   The three primary colors in additive mixing are red, green, and blue. In the absence of color or, when no colors are showing, the result is black. If all three primary colors are showing, the result is white. When red and green combine, the result is yellow. When red and blue combine, the result is magenta. When blue and green combine, the result is cyan.

Q: The shortest book in number of words? 1944 0

  • 1
    John
    Correct
    Wrong
  • 2
    Jude
    Correct
    Wrong
  • 3
    Obadiah
    Correct
    Wrong
  • 4
    Philemon
    Correct
    Wrong
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Answer : 1. "John"
Explanation :

Answer: A) John Explanation:

Q: Which three amendments were passed shortly after the civil war? 1943 0

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Answer :
Explanation :

The three major amendments that were passed shortly after the Civil War are the reconstruction amendments that were the 13th, 14th, and 15th amendments.   The 13th Amendment abolished slavery, The 14th granted African American citizenship and equal protection before the law, (and) The 15th Amendment attempted to secure the right to vote for newly freed slaves.

Q: Two numbers are respectively 40% and 30% more than a third number. The second number expressed in terms of percentage of the first is ? 1942 0

  • 1
    92.8%
    Correct
    Wrong
  • 2
    84.23%
    Correct
    Wrong
  • 3
    87.14%
    Correct
    Wrong
  • 4
    94.1%
    Correct
    Wrong
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Answer : 1. "92.8%"
Explanation :

Answer: A) 92.8% Explanation: Here, x = 40 and y = 30;Therefore second number= [[100+y100+x] x 100 ]% of first number= [[100+y100+x] x 100 ]% of first numberSecond number = 92.8% of the first number.

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