IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Which elements are malleable and good conductors of electricity? 2443 0

  • 1
    tin and silver
    सही
    गलत
  • 2
    iodine and silver
    सही
    गलत
  • 3
    tin and xenon
    सही
    गलत
  • 4
    iodine and xenon
    सही
    गलत
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उत्तर : 1. "tin and silver"
व्याख्या :

Answer: A) tin and silver Explanation: Tin and Silver are malleable and good conductors of electricity. The other combinations have a non metal in them which are bad conductors.

प्र: Rushi and Arun are two business partners. They invest their capital in the ratio 7 : 9. After 6 months, a third person Ram joins them with a capital of two third of that of Arun. After a year, profit share of Rushi was Rs. 5600, then find total profit? 2101 0

  • 1
    26,250
    सही
    गलत
  • 2
    19,200
    सही
    गलत
  • 3
    18,650,
    सही
    गलत
  • 4
    15,200
    सही
    गलत
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उत्तर : 4. "15,200"
व्याख्या :

Answer: D) 15,200 Explanation: Ratio of investment of all the three members = (7 x 12) : (9 x 12) : (2/3 x 9 x 6) = 7 : 9 : 3 Given Rushi's one year profit = Rs. 5600 => Let the total profit = Rs. P Then, P x 7/19 = 5600 Total profit P = 19 x 5600/7 = Rs. 15,200.

प्र: In how many ways the word 'SCOOTY' can be arranged such that 'S' and 'Y' are always at two ends? 2098 0

  • 1
    720
    सही
    गलत
  • 2
    360
    सही
    गलत
  • 3
    120
    सही
    गलत
  • 4
    24
    सही
    गलत
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उत्तर : 4. "24"
व्याख्या :

Answer: D) 24 Explanation: Given word is SCOOTY ATQ, Except S & Y number of letters are 4(C 2O's T) Hence, required number of arrangements = 4!/2! x 2! = 4! = 4 x 3 x 2 = 24 ways.

प्र: Find the odd man out of the following number series? 22, 26, 42, 78, 142, 244 1614 0

  • 1
    244
    सही
    गलत
  • 2
    142
    सही
    गलत
  • 3
    78
    सही
    गलत
  • 4
    42
    सही
    गलत
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उत्तर : 1. "244"
व्याख्या :

Answer: A) 244 Explanation: The given number series 22, 26, 42, 78, 142, 244 follows a pattern that, 2222 + 22 = 22 + 4 = 2626 + 42 = 26 + 16 = 4242 + 62 = 42 + 36 = 7878 + 82 = 78 + 64 = 142142 + 102 = 142 + 100 = 242    Hence, the odd one in the given number series is 244.

प्र: A number when subtracted by 1/7 th of itself gives the same value as the sum of all the angles of a triangle. What is the number? 1864 0

  • 1
    420
    सही
    गलत
  • 2
    210
    सही
    गलत
  • 3
    70
    सही
    गलत
  • 4
    35
    सही
    गलत
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उत्तर : 2. "210"
व्याख्या :

Answer: B) 210 Explanation: Let the required number be 'p' We know, sum of angles in a triangle are 180 deg According to given data, p - p/7 = 180 7p - p = 180 x 7 => 6p = 1260 => p = 1260/6 = 210

प्र: Under which conditions are gases most soluble in water? 1586 0

  • 1
    low pressure and low temperature
    सही
    गलत
  • 2
    low pressure and high temperature
    सही
    गलत
  • 3
    high pressure and low temperature
    सही
    गलत
  • 4
    high pressure and high temperature
    सही
    गलत
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उत्तर : 3. "high pressure and low temperature"
व्याख्या :

Answer: C) high pressure and low temperature Explanation: Henry's Law tells that the solubility of a gas is directly proportional to the partial pressure of the gas above the solvent. Hence under high pressure, more gas is dissolved. Also that Henry's Law involves a constant which is temperature-dependent. Under high temperatures, less gas is dissolved whereas under low temperatures, more gas is dissolved.   For Example ::   You can think of a can of soda. The contents are under pressure and if you shake the can before opening, the soda fizzes out all over as you open it. So the higher the pressure, the more gas or more CO2 can be dissolved in the drink. Eliminate choices 1 and 2. Now focus on the temperature. Soda goes flat (loses carbonation or gas) as it warms up. Soda is usually served cold because more of the carbonation or CO2 stays in the drink when the soda is cold.   Hence, in high pressure and low temperature conditions gases are most soluble in water.

प्र: Ian has 14 boxes of paper and divides them evenly between 4 coworkers. How many whole boxes did each coworker get? 22094 0

  • 1
    2
    सही
    गलत
  • 2
    2.5
    सही
    गलत
  • 3
    3
    सही
    गलत
  • 4
    3.5
    सही
    गलत
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उत्तर : 3. "3"
व्याख्या :

Answer: C) 3 Explanation: Given number of boxes = 14 Number of workers = 4 Now, number of whole boxes per worker = 14/4 = 3.5  Hence, number of whole boxes per each coworker = 3

प्र: Most bacteria reproduce by 1962 0

  • 1
    budding
    सही
    गलत
  • 2
    binary fission
    सही
    गलत
  • 3
    fragmentation
    सही
    गलत
  • 4
    mitosis
    सही
    गलत
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उत्तर : 2. "binary fission"
व्याख्या :

Answer: B) binary fission Explanation: Most bacteria is reproduce by binary fission.

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