IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: If (2a + 3b)/(5a - 3b) = 23/5 , then the value of ba is ? 1934 0

  • 1
    5
    सही
    गलत
  • 2
    4
    सही
    गलत
  • 3
    20
    सही
    गलत
  • 4
    28
    सही
    गलत
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उत्तर : 3. "20"
व्याख्या :

Answer: C) 20 Explanation: Given (2a + 3b)/(5a - 3b) = 23/5 => 10a + 15b = 115a - 69b=> 105a = 84b => 5a = 4b a/b = 4/5 => a=4 & b=5=> bxa = 5x4 = 20.

प्र: On her deathbed, a grand mother called upon his three grand sons and told them to distribute all her assets worth Rs. 52,500 in the ratio of 1/35 : 1/21 : 1/15 amongst themselves. Find the smallest share amongst the three portions ? 1473 0

  • 1
    Rs. 5422
    सही
    गलत
  • 2
    Rs. 10,500
    सही
    गलत
  • 3
    Rs. 12,800
    सही
    गलत
  • 4
    Rs. 15,000
    सही
    गलत
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उत्तर : 2. "Rs. 10,500"
व्याख्या :

Answer: B) Rs. 10,500 Explanation: The ratio of distribution should be: 21 x 15 : 15 x 35 : 35 x 21= 315 : 525 : 735 = 3 : 5 : 7The smallest share will be of worth: 3/15 x 52,500 = Rs. 10,500

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उत्तर : 1. "8"
व्याख्या :

Answer: A) 8 Explanation: There are 16 small cubes attached to the outer walls of the cuboid.Therefore remaining inner small cubes will be the cubes having two sides green coloured.So the required number = 24 - 16 = 8

प्र: Only if Sheela is happy, then she does not go to work. 2133 0

  • 1
    Sheela is not happy and she goes to work.
    सही
    गलत
  • 2
    Sheela is happy and she does not go to work
    सही
    गलत
  • 3
    Sheela is not happy and she does not go to work.
    सही
    गलत
  • 4
    Sheela is happy and she goes to work.
    सही
    गलत
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उत्तर : 1. "Sheela is not happy and she goes to work."
व्याख्या :

Answer: A) Sheela is not happy and she goes to work. Explanation: The event of "Sheela is not going to work" happens only when the event "Sheela is happy" happens. Also, if the event "Sheela is happy" does not happen, then the event "Sheela is not going to work" will not happen. In other words, if it is true that Sheela is not happy, then it means that Sheela is going to work.

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उत्तर : 2. "Only a follows"
व्याख्या :

Answer: B) Only a follows Explanation: The proper nourishment will make the monkeys or human beings work properly. So, the course of action I follows. Course of action II does not follow as there is no information about captive or wild monkeys.

प्र: A watch which gains uniformly is 2 minutes low at noon on Tuesday and is 4 min 48 sec fast at 2 p.m. on the following Tuesday. When was it correct ? 1579 0

  • 1
    12 p.m. on Wednesday
    सही
    गलत
  • 2
    2 p.m. on Thursday
    सही
    गलत
  • 3
    3 p.m. on Thursday
    सही
    गलत
  • 4
    2 p.m. on Wednesday
    सही
    गलत
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उत्तर : 2. "2 p.m. on Thursday"
व्याख्या :

Answer: B) 2 p.m. on Thursday Explanation: Time from 12 p.m. on Tuesday to 2 p.m. on the following Tuesday = 7 days 2 hours.= 170 hours.The watch gains = (2 + 4 x 4/5) min= 34/5 min. in 170 hrs.Now, 34/5 min are gained in 170 hrs.Then, 2 min are gained in (170 x 5/34 x 2) hrs.Watch is correct after 2 days 2 hrs after 12 p.m. on Tuesday, i.e., it will be correct at 2 p.m. on Thursday.

प्र: Choose the Antonym of the following word 'Autonomy' 1935 0

  • 1
    Antipathy
    सही
    गलत
  • 2
    Dependence
    सही
    गलत
  • 3
    Antruism
    सही
    गलत
  • 4
    Animation
    सही
    गलत
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उत्तर : 2. "Dependence"
व्याख्या :

Answer: B) Dependence Explanation: 'Autonomy' means personal independence. Hence, the word 'dependence' is farthest in meaning to the given word 'Autonomy'.

प्र: Choose the Antonym of the given word from the following options 'Jettison' 2601 0

  • 1
    Salvage
    सही
    गलत
  • 2
    Submerge
    सही
    गलत
  • 3
    Repent
    सही
    गलत
  • 4
    Descend
    सही
    गलत
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उत्तर : 1. "Salvage"
व्याख्या :

Answer: A) Salvage Explanation: 'Jettison' means to discard and 'salvage' means to rescue something discarded. Hence, 'salvage' is the word which is farthest in meaning to the given word 'Jettison'.

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