IIT JEE Practice Question and Answer

Q: When during the Cell Cycle are Chromosomes visible? 2013 0

  • 1
    only during interphase
    Correct
    Wrong
  • 2
    only during cell division
    Correct
    Wrong
  • 3
    only during G1 phase
    Correct
    Wrong
  • 4
    only during they are replicated
    Correct
    Wrong
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Answer : 2. "only during cell division"
Explanation :

Answer: B) only during cell division Explanation: During most of the cell cycle, interphase, the chromosomes are somewhat less condensed and are not visible as individual objects under the light microscope. However during cell division, mitosis, the chromosomes become highly condensed and are then visible as dark distinct bodies within the nuclei of cells. The chromosomes are most easily seen and identified at the metaphase stage of cell division and most of the chromosome images in this gallery are pictures of metaphase chromomosomes. The cell division takes place in mitosis stage.

Q: Mr. X sold two properties P1 and P2 for Rs 1,00,000 each. He sold property P1 for 20% less than what he paid for it. What is the percentage of profit of property P2, so that he is not in gain or loss on the sale of two properties? 1904 0

  • 1
    33.33%
    Correct
    Wrong
  • 2
    29.97%
    Correct
    Wrong
  • 3
    25%
    Correct
    Wrong
  • 4
    22.22%
    Correct
    Wrong
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Answer : 1. "33.33%"
Explanation :

Answer: A) 33.33% Explanation: Let 'A' be the cost price of property P1. Then from the given data, the selling price of P1 = Rs. 1,00,000 He got 20% loss on selling P1 ⇒A - 20A100 = 100000⇒A = 1,25,000 Therefore, the amount he lossed on selling P1 = 25,000 As ge he got no loss or gain on sale of P1 and P2, the gain on selling P2 = 25,000 But the selling price of P2 = 1,00,000 => Cost price of P2 = 75,000   Hence, the profit percentage on P2 = GainCPx 100 = 2500075000x100 = 1003= 33.33%

Q: Which among the following pairs is mismatched? 2625 0

  • 1
    Electricity act – 2003
    Correct
    Wrong
  • 2
    Green Revolution – 1991
    Correct
    Wrong
  • 3
    National Telecom policy – 2012
    Correct
    Wrong
  • 4
    National policy on skill & development–2009
    Correct
    Wrong
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Answer : 2. "Green Revolution – 1991"
Explanation :

Answer: B) Green Revolution – 1991 Explanation: The given matching is about the policies and acts names and in which year they took place. Here Green Revolution - 1991 is given and which is not TRUE. It took place in between 1960 - 1980.

Q: Find the Odd One Out? 4, 6, 12, 30, 81, 315. 2335 0

  • 1
    6
    Correct
    Wrong
  • 2
    12
    Correct
    Wrong
  • 3
    81
    Correct
    Wrong
  • 4
    315
    Correct
    Wrong
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Answer : 3. "81"
Explanation :

Answer: C) 81 Explanation: Given the number series is 4, 6, 12, 30, 81, 315. Here it follows a pattern that 4 4 x 1.5 = 6 6 x 2 = 12 12 x 2.5 = 30 30 x 3 = 90 not equals to 81 90 x 3.5 = 315   Hence the odd one in the series is 81.

Q: Simplify the following expression? 40% of (244 x ?) = 48 1357 0

  • 1
    24
    Correct
    Wrong
  • 2
    22
    Correct
    Wrong
  • 3
    20
    Correct
    Wrong
  • 4
    18
    Correct
    Wrong
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Answer : 3. "20"
Explanation :

Answer: C) 20 Explanation: We know that  40% = 40100 = 25⇒25 x 244 x ? = 48? = 48 x 5 x 42 x 24 = 20

Q: Sum of present ages of P and Q is 41. Age of P 2 year hence is equal to age of R, 1 year ago. Age of P, 4 year hence is equal to age of Q 1 year ago and ratio of present age of P and S is 3 : 4. Find the difference of age of R and S. 2380 0

  • 1
    2
    Correct
    Wrong
  • 2
    3
    Correct
    Wrong
  • 3
    4
    Correct
    Wrong
  • 4
    5
    Correct
    Wrong
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Answer : 2. "3"
Explanation :

Answer: B) 3 Explanation: According to the given data, P + Q = 41 ......(1) R - 1 = P + 2 R = P + 3 and P + 4 = Q - 1 => Q = P + 5 ....(2) From (1)&(2) P = 18 Q = 18 + 5 = 23 R = 18 + 3 = 21 => P/S = 3/4 => S = 4/3 x 18 = 24 Required Difference = S - R = 24 - 21 = 3.

Q: What do genes code for? 1330 0

  • 1
    Ptoteins
    Correct
    Wrong
  • 2
    DNA
    Correct
    Wrong
  • 3
    RNA
    Correct
    Wrong
  • 4
    None
    Correct
    Wrong
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Answer : 1. "Ptoteins"
Explanation :

Answer: A) Ptoteins Explanation: The genome of an organism is inscribed in DNA, or in some viruses RNA. The portion of the genome that codes for a protein or an RNA is referred to as a gene. Those genes that code for proteins are composed of tri-nucleotide units called codons, each coding for a single amino acid.

Q: What goes up when rain comes down? 2007 0

  • 1
    Air
    Correct
    Wrong
  • 2
    Heat
    Correct
    Wrong
  • 3
    Umbrella
    Correct
    Wrong
  • 4
    None
    Correct
    Wrong
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Answer : 3. "Umbrella"
Explanation :

Answer: C) Umbrella Explanation: Yes, when rain starts falling umbrella goes up for pretecting us from wetting.

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