IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: On a school’s Annual day sweets were to be equally distributed amongst 112 children. But on that particular day, 32 children were absent. Thus the remaining children got 6 extra sweets. How many sweets was each child originally supposed to get ? 1667 0

  • 1
    14
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  • 2
    16
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  • 3
    12
    सही
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  • 4
    15
    सही
    गलत
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उत्तर : 4. "15"
व्याख्या :

Answer: D) 15 Explanation: Let 'K' be the total number of sweets.Given total number of students = 112If sweets are distributed among 112 children,Let number of sweets each student gets = 'L' => K/112 = L ....(1)But on that day students absent = 32 => remaining = 112 - 32 = 80Then, each student gets '6' sweets extra. => K/80 = L + 6 ....(2)from (1) K = 112L substitute in (2), we get112L = 80L + 48032L = 480L = 15 Therefore, 15 sweets were each student originally supposed to get.

प्र: A supplier supplies cartridges to a news paper publishing house. He earns a profit of 25% by selling cartridges for Rs. 1540. Find the cost price of the Cartridges ? 2625 0

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    Rs. 1100
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  • 2
    Rs. 1793.4
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  • 3
    Rs. 1440
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  • 4
    Rs. 1232
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    गलत
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उत्तर : 4. "Rs. 1232"
व्याख्या :

Answer: D) Rs. 1232 Explanation: Let Cost Price(C.P) = Pgain% = {(S.P-C.P)/C.P} x 10025 = {(1540-P)/P} x 10025/100 = (1540-P)/P=> P = 4(1540)-4P=> 5P = 4(1540)=> P = 1232So, Cost Price = Rs. 1232

प्र: A company requires 12,100 strength. Present employees are 400 ladies and 6400 gents. To reach the target how many ladies required to maintain the same ratio ? 3976 0

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    400
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  • 2
    600
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  • 3
    900
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  • 4
    700
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उत्तर : 3. "900"
व्याख्या :

Answer: C) 900 Explanation: 6,400 gents, 2400 ladies in that company.So total 8,800employees.for 8,800 employees, we want 2400 ladies.for 12,100employees we want how many ladies ?=> (12,100/8,800) x 2400 = 3300.So we want 3300 - 2400 = 900 more ladies.

प्र: A secret can be told to only 3 persons in 3 minutes. Each person in turn tells 3 other persons in the next 3 minutes and the processes continues accordingly. In 30 minutes how many persons can be told this secret in this way ? 2167 0

  • 1
    88572
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  • 2
    77854
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  • 3
    99584
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  • 4
    55654
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उत्तर : 1. "88572"
व्याख्या :

Answer: A) 88572 Explanation: Given a secret is told to 3 persons in 3 minutes.And if the process continues with each person saying 3 other persons,In 30 minutes => the rocess for 10 times because each person time is 3 minutes.Required number of persons = 3 + 32 + 33 + .... + 39 + 310   Now it forms a geometric progression,   Sum to n terms is S = arn - 1r - 1   Here a = 3, r = 3  => 59048 x 3 /2   = 88572.

प्र: If 78K928L is divisible by 6, then which of the following can Q and R take ? 6055 0

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    K=2 & L=3
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  • 2
    K=1 & L=4
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  • 3
    K=1 & L=2
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  • 4
    K=3 & L=3
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उत्तर : 2. "K=1 & L=4"
व्याख्या :

Answer: B) K=1 & L=4 Explanation: As per divisibility rule a number is divisible by 6 means it should be divisible by 2 and 3 case 1 : the divisibility rule for 2 is the number should be end with even number in this case R =2 & R=4 case 2 : The divisibility rule for 3 is the sum of numbers should be divisible by 3so if we take option (2) Q=1 & R=4 the sum is 39 if we take option (3) Q=1 & R=2 the sum is 37 So Option (2) is correct 39 is divided by 3

प्र: M and N have children A and B.F is spouse of B.D is child of F.P is son in law of N.K is kid of P. Who is male chiled of M and N ? 7739 0

  • 1
    B
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  • 2
    A
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  • 3
    None
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  • 4
    Can't be determined
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उत्तर : 1. "B"
व्याख्या :

Answer: A) B Explanation: Spouse means a person's partner in marriage, it can be male or female.But given F is spouse of BAnd P is Son in law of NRelation between F and BRelation between P and A onlyand p is male So, A must be female=> B is male child.

प्र: ………….being poor, Kavitha still dresses more appropriately than most of her friends. 12482 0

  • 1
    Although
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  • 2
    Inspite
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  • 3
    Since
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  • 4
    Despite
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उत्तर : 4. "Despite"
व्याख्या :

Answer: D) Despite Explanation: Despite, Its meaning is "without effected by ", without effecting by their poverty, Kavitha still dresses more appropriately than most of her friends.

प्र: The average temperature of Monday to Wednesday was 37 C and of Tuesday to Thursday was 34 C. If the temperature on Thursday was 4/5 th of that of Monday, the temperature on Thursday was ? 1935 0

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    35 c
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  • 2
    36 c
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  • 3
    34 c
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  • 4
    32 c
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उत्तर : 2. "36 c"
व्याख्या :

Answer: B) 36 c Explanation: Monday + Tuesday + Wednesday = 37 x 3 -----------(1)Tuesday + Wednesday + Thursday = 34 x 3---------(2)Thursday = 4/5 of Monday ------------------(3)subtract eqn (1) from (2) we get,Thursday - Monday = -9 => Monday - Thursday = 9.......(4)From (3) & (4), we get So,Thursday = 36 C

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