IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: A letter is takenout at random from 'ASSISTANT'  and another is taken out from 'STATISTICS'. The probability that they are the same letter is : 2142 0

  • 1
    35/96
    सही
    गलत
  • 2
    19/90
    सही
    गलत
  • 3
    19/96
    सही
    गलत
  • 4
    None of these
    सही
    गलत
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उत्तर : 2. "19/90"
व्याख्या :

Answer: B) 19/90 Explanation: ASSISTANT→AAINSSSTT STATISTICS→ACIISSSTTT Here N and C are not common and same letters can be A, I, S, T. Therefore  Probability of choosing A =  2C19C1×1C110C1 = 1/45   Probability of choosing I = 19C1×2C110C1 = 1/45 Probability of choosing S = 3C19C1×3C110C1 = 1/10 Probability of choosing T = 2C19C1×3C110C1 = 1/15 Hence, Required probability =   145+145+110+115= 1990

प्र: Sumanth walks 200 feet straight from his house, which is facing north and then he walks 100 feet in reverse direction.Further he takes a left turn and walks 300 yards.In Which direction is Sumanth now from his original position? 2142 0

  • 1
    South-East
    सही
    गलत
  • 2
    North-East
    सही
    गलत
  • 3
    South-West
    सही
    गलत
  • 4
    North-West
    सही
    गलत
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उत्तर : 2. "North-East"
व्याख्या :

Answer: B) North-East Explanation: Starting From his house, Sumanth walks 200 feet straight towards North; we can write it as N200. Similarly, the other distances and directions can be considered and written as follows : (Notice that he covers 300 yards towards East; one yard = 3 feet and hence 300 yards = 900 feet)  N200S100E900 Adding all south and all North distances and finding the net result, and also adding all East and all West distances and finding the net result, this can further be summarized as : N100E900  Thus, the direction from his original position is North-East.

प्र: In a Certain Country 1/2 of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10 ? 2142 0

  • 1
    4
    सही
    गलत
  • 2
    6
    सही
    गलत
  • 3
    8
    सही
    गलत
  • 4
    10
    सही
    गलत
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उत्तर : 1. "4"
व्याख्या :

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

प्र: If CGKQW is one sequence following a logic, and another five-letter sequence following similar type of logic is BFJPV, then one more variation of this type can be ? 2142 0

  • 1
    VPCFT
    सही
    गलत
  • 2
    DHLRX
    सही
    गलत
  • 3
    CFKNT
    सही
    गलत
  • 4
    None
    सही
    गलत
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उत्तर : 2. "DHLRX"
व्याख्या :

Answer: B) DHLRX Explanation: The logic behind the sequence given in the question is +4, +4, +6, +6Therefore, the sequence which follows the same logic in the given options is DHLRX.

प्र: Ram sell his goods 25% cheaper than Shyam and 25% dearer than Bram. How much % is Bram's good cheaper than Shyam ? 2142 0

  • 1
    60%
    सही
    गलत
  • 2
    40%
    सही
    गलत
  • 3
    50%
    सही
    गलत
  • 4
    30%
    सही
    गलत
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उत्तर : 2. "40%"
व्याख्या :

Answer: B) 40% Explanation: Lets say shyam sells at 100,   Since Ram sells 25% cheaper than Shyam,   Therefor Ram sells at less than 25% of100 or 75 rs.   Ram sells 25% dearer than Bram or 125% of Ram =100% of Bram or   125% of x (say x price of bram )=75rs.or 100% of x =60rs.hence price of bram is 60rs.   now Bram's good is cheaper than Shyam's as (100-60)x100/100% or 40%.   Hence Brams Good is 40% cheaper than that of Shyam's good.

प्र: Which value is equal to 5% of 1,500? 2141 0

  • 1
    35
    सही
    गलत
  • 2
    55
    सही
    गलत
  • 3
    75
    सही
    गलत
  • 4
    45
    सही
    गलत
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उत्तर : 3. "75"
व्याख्या :

Answer: C) 75 Explanation: In the question it is asked for 5% of 1500 5 x 1500/100 = 15 x 5 = 75.   Hence, 5% of 1,500 is equal to 75.

प्र: Which letter indicates systolic pressure? 2141 0

  • 1
    i
    सही
    गलत
  • 2
    b
    सही
    गलत
  • 3
    c
    सही
    गलत
  • 4
    a
    सही
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उत्तर : 4. "a"
व्याख्या :

Answer: D) a Explanation: a -  at the peak of changes in blood pressure indicates the systiolic pressure.

प्र: Anil purchases two books for Rs.100. He sells first at loss of 5% and second al 20% profit. If he gets Overall profit of 5% then what is cost of first book? 2141 0

  • 1
    58
    सही
    गलत
  • 2
    60
    सही
    गलत
  • 3
    55
    सही
    गलत
  • 4
    45
    सही
    गलत
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उत्तर : 2. "60"
व्याख्या :

Answer: B) 60 Explanation: -5-----------------------5-------------------20 5-(-5) = 10 20-5= 15 Ratio of cost price of book1 and book2 = 3:2  Then cost price of book 1 is given by (3/5) x 100 = Rs. 60.

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