IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Guess the Missing number in the Number Challenge ? 1614 0

  • 1
    8
    सही
    गलत
  • 2
    32
    सही
    गलत
  • 3
    44
    सही
    गलत
  • 4
    64
    सही
    गलत
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उत्तर : 4. "64"
व्याख्या :

Answer: D) 64 Explanation: The logic in the challenge is  81x6 = 9x6 = 54 144x7=84     Similarly, 64x8 = 8x8 = 64.

प्र: When 5% is lost in grinding Maize, a country has to import 20 million bags; but when only 2% is lost, it has to import only 15 million bags. Find the quantity of Maize, which grows in the country ? 1614 0

  • 1
    188 million
    सही
    गलत
  • 2
    166 2/3 million
    सही
    गलत
  • 3
    192 3/4 million
    सही
    गलत
  • 4
    None
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उत्तर : 2. "166 2/3 million"
व्याख्या :

Answer: B) 166 2/3 million Explanation: 5% - 2% = 3%=> 3% ------ 5 million bags 100% ---- ? => 166 2/3 million bags.

प्र: Question : What is the sum which earned interest ? Statements : a. The total simple interest was Rs. 9000 after 9 years.b. The total of sum and simple interest was double of the sum after 6 years. 1614 0

  • 1
    Only a is sufficient
    सही
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  • 2
    Neither a nor b is sufficient
    सही
    गलत
  • 3
    Only b is sufficient
    सही
    गलत
  • 4
    Both a and b sufficient
    सही
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उत्तर : 4. "Both a and b sufficient"
व्याख्या :

Answer: D) Both a and b sufficient Explanation: Let the sum be Rs. x a. gives, S.I = Rs. 9000 and time = 9 years. b. gives, Sum + S.I for 6 years = 2 x Sum --> Sum = S.I for 6 years. Now, S.I for 9 years = Rs. 9000 S.I for 1 year = Rs. 9000/9 = Rs. 1000. S.I for 6 years = Rs. (1000 x 6)= Rs. 6000. --> x = Rs. 6000 Thus, both a and b are necessary to answer the question.

प्र: Where does translation take place in the cell? 1614 0

  • 1
    Nucleus
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  • 2
    Mitochondria
    सही
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  • 3
    Ribosomes
    सही
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  • 4
    Cytoplasm
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उत्तर : 4. "Cytoplasm"
व्याख्या :

Answer: D) Cytoplasm Explanation: Translation occurs in the cytoplasm whereas transcription occurs in the nucleus.   Transcription and Translation: Terms transcription and translation in biology are generally related to the DNA and its properties. Human cells replicate. In order to do that, they have to produce the same constituents for the new cell that is to be made. The only way to do that is by producing proteins.   The proteins are produced in the process that is called protein synthesis. The first step is in the nucleus where a particular gene is being expressed so it enables all protein factors to come and to replicate that part of a chromosome. This is finished when mRNA, the same single-stranded genetic code of a particular gene, is formed. This is transcription. Right after that, the mRNA enters the cytoplasm through nuclear pores. There, it could be translated into proteins by ribosomes. This process is called translation.

प्र: Guess the Missing Letter in the Letter Puzzle ? 1613 0

  • 1
    L
    सही
    गलत
  • 2
    M
    सही
    गलत
  • 3
    N
    सही
    गलत
  • 4
    O
    सही
    गलत
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उत्तर : 1. "L"
व्याख्या :

Answer: A) L Explanation: The Logic followed in the given puzzle is : L x P = 12 x 16 = 192 (Alphabetical numbers of L & P) P x T = 16 x 20 = 320 (Alphabetical numbers of P & T) Similarly, K x () = 132 => () = 132/11 = 12 => L Hence, the missing letter is L

प्र: Two trains cross each other in _____ time ? 1613 0

  • 1
    145 sec
    सही
    गलत
  • 2
    124 sec
    सही
    गलत
  • 3
    158 sec
    सही
    गलत
  • 4
    162 sec
    सही
    गलत
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उत्तर : 4. "162 sec"
व्याख्या :

Answer: D) 162 sec Explanation: Given two trains of length = 180 mts + 180 mts  The distance is = Length of trains = 360 mts  Speed = 58 - 50 = 8 kmph x 5/18 m/s Then, Time = dis/speed = (360x18) / (8x5) = 162 sec.

प्र: What is the value of a two–digit number? A. The sum of the digits is 15. B. The difference of the squares of the digits is 45. C. The difference of their digits is 3. 1613 0

  • 1
    B and C together are sufficient
    सही
    गलत
  • 2
    Any one pair of A and B, B and C or C and A is sufficient
    सही
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  • 3
    C and A together are sufficient
    सही
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  • 4
    A and B together are sufficient
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उत्तर : 2. "Any one pair of A and B, B and C or C and A is sufficient"
व्याख्या :

Answer: B) Any one pair of A and B, B and C or C and A is sufficient Explanation: From the given data, Let the two gits of a number be x & y A) x + y = 15   B) x2 - y2 = 45 (x+y) (x - y) = 45   C) x - y = 3 From any 2 of the given 3 statements, we can find that 2 digit number as  2x = 18 => x = 9 => y = 6 Hence, 2 digit number is 96.   Any one pair of A and B, B and C or C and A is sufficient to find.

प्र: What causes brownian motion in colloids? 1612 0

  • 1
    coagulation of particles and the dispersed phase
    सही
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  • 2
    erratic flashes of light
    सही
    गलत
  • 3
    molecules of the dispersion medium colliding with dispersed phase particles
    सही
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  • 4
    All the above
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उत्तर : 3. "molecules of the dispersion medium colliding with dispersed phase particles"
व्याख्या :

Answer: C) molecules of the dispersion medium colliding with dispersed phase particles Explanation: When their is a colloid in the solution, then it will show the Brownian movement, such as dust particle in the air will show the Brownian movement.   Hence, Brownian movement arises due to the impact of the molecules of the dispersion medium with the colloidal particles. It has been postulated that the impact of the molecules of dispersion medium on the colloidal particles are unequal.   This leads to the zig-zag (random) motion of the colloidal particles.

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