IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: A contractor undertook to complete a piece of work in 120 Days and employed 140 men upon it. At the end of 66 days only half of the work was done,so he put on 25 extra men. By how much time did he exceed the specific time ? 2649 0

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    2 days
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  • 2
    3 days
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  • 3
    4 days
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  • 4
    5 days
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उत्तर : 1. "2 days"
व्याख्या :

Answer: A) 2 days Explanation: work done=total number of person x number of days;half of work done = 140 x 66;For half of remaining work 25 extra men are added.Therefore, total men for half work remaining = 140 + 25 = 165;Let 2nd half work will be completed in K days;140 x 66 = 165 x KK = 122;Hence, extra days => 122-120 = 2days.

प्र: How many 6-digit even numbers can be formed from the digits 1, 2, 3, 4, 5, 6 and 7 so that the digits should not repeat and the second last digit is even ? 2644 0

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    521
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  • 2
    720
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  • 3
    420
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  • 4
    225
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उत्तर : 2. "720"
व्याख्या :

Answer: B) 720 Explanation: Let last digit is 2when second last digit is 4 remaining 4 digits can be filled in 120 ways, similarly second last digit is 6 remained 4 digits can be filled in 120 ways.so for last digit = 2, total numbers=240   Similarly for 4 and 6When last digit = 4, total no. of ways =240and last digit = 6, total no. of ways =240so total of 720 even numbers are possible.

प्र: What rights does the Declaration of Independence express? 2640 0

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    The right to remain silent when interrogated by police
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    The right to citizenship
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    Legal rights of citizens
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  • 4
    Human rights of citizens, including life and liberty
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उत्तर : 3. "Legal rights of citizens"
व्याख्या :

Answer: C) Legal rights of citizens Explanation: The Declaration of Independence express Legal rights of citizens.

प्र: Ayush was born two years after his father's marriage. His mother is five years younger than his father but 20 years older than Ayush who is 10 years old. At what age did the father get married ? 2640 0

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    25 years
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  • 2
    24 years
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  • 3
    23 years
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  • 4
    22 years
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उत्तर : 3. "23 years"
व्याख्या :

Answer: C) 23 years Explanation: Ayush's present age = 10 years.His mother's present age = (10 + 20) years = 30 years.Ayush's father's present age = (30 + 5) years = 35 years.Ayush's father's age at the time of Ayush's birth = (35 - 10) years = 25 years. Therefore Ayush's father's age at the time of marriage = (25 - 2) years = 23 years.

प्र: Crack the Logical Password of the Mobile ? 2640 0

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उत्तर :
व्याख्या :

65292 1st digit is 3 x 2 = 6 3rd digit is 5-3 = 2 4th digit is 5+4 = 9  6+5 = 2+9 = 9+2 = 11

प्र: Sushma joins a job at 20 yrs. First 3 years salary is 10,000 p.a. Afterwards every year increment of 2,000 per year for 10 years. Then salary becomes constant till retirement. At retirement average salary is 25,000. (throughout career). At what age Sushma retires ? 2640 0

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    50 yrs
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    47 yrs
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    45 yrs
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  • 4
    42 yrs
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उत्तर : 1. "50 yrs"
व्याख्या :

Answer: A) 50 yrs Explanation: Let age of retirement = Sso according to the given condition 25000(x-20)=10000 x 3 + 12000 + 14000 + 16000 + 18000 + 20000 + 22000 + 24000 + 26000 + 28000 + 30000 + 30000(S-33)= 30000 + 210000 + 30000S-990000= 30000S - 750000or 25000S - 500000 = 30000x - 750000or 5000x = 250000or S = 50 yrs.

प्र: One paper is equally folded 35 times, then what is the new thickness of the paper ? 2640 0

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    T(2^50)
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  • 2
    50T
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  • 3
    2 x 50 T
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  • 4
    T/50
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उत्तर : 1. "T(2^50)"
व्याख्या :

Answer: A) T(2^50) Explanation: Let initial thickness of the paper be 'T'after first fold it will be '2T' = 21Tafter second fold it will be '4T' = 22T after 50th fold it will be T x (250T)

प्र: Arun purchased 30 kg of wheat at the rate of Rs. 11.50 per kg and 20 kg of wheat at the rate of 14.25 per kg. He mixed the two and sold the mixture. Approximately what price per kg should be sell the mixture to make 30% profit ? 2636 0

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    Rs. 17.80
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  • 2
    Rs. 16.30
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  • 3
    Rs. 14
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  • 4
    Rs. 15.40
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उत्तर : 2. "Rs. 16.30"
व्याख्या :

Answer: B) Rs. 16.30 Explanation: C.P. of 50 kg wheat = (30 * 11.50 + 20 * 14.25) = Rs. 630. S.P. of 50 kg wheat = 130% of Rs. 630 = 130/100 * 630 = Rs. 819. S.P. per kg = 819/50 = Rs. 16.38 = 16.30.

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