IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: If 12 men can reap 120 acres of land in 36 days, how many acres of land can 54 men reap in 54 days? 4039 0

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    710 acres
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    760 acres
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  • 3
    810 acres
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  • 4
    860 acres
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उत्तर : 3. "810 acres"
व्याख्या :

Answer: C) 810 acres Explanation: 12 men120 acres36 days54 men?54 days  As 12 men can reap 120 acres, 54 men will be able to reap more acres in 36 days, 120 acres of land was reaped, so in 54 days, more land will be reaped.   Thus, the numbers of acres that can be reaped by 54 men in 54 days = 5412x120x5436 = 810 acres

प्र: National Highway No: _____  is called as Shershah Suri Marg ? 4031 0

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    NH-1
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  • 2
    NH-3
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  • 3
    NH-7
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  • 4
    NH-5
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उत्तर : 1. "NH-1"
व्याख्या :

Answer: A) NH-1 Explanation: N.H. 1 is also called The Sher Shah Suri Marg between Delhi and Amritsar.

प्र: A watch gains 5 seconds in 3 minutes and was set right at 8 AM. What time will it show at 10 PM on the same day ? 4023 0

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    10 : 27 : 41 AM
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    8 : 51 : 04 AM
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    9 : 45 : 15 PM
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  • 4
    10 : 23 : 20 PM
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उत्तर : 4. "10 : 23 : 20 PM"
व्याख्या :

Answer: D) 10 : 23 : 20 PM Explanation: The watch gains 5 seconds in 3 minutes = 100 seconds in 1 hour. From 8 AM to 10 PM on the same day, time passed is 14 hours. In 14 hours, the watch would have gained 1400 seconds or 23 minutes 20 seconds. So, when the correct time is 10 PM, the watch would show 10 : 23 : 20 PM

प्र: Time taken by P alone to finish a work is 50% more than the time taken by P and Q together. Q is thrice as efficient as R. If Q and R together can complete the work in 22.5 days, then how many days will P alone take to complete the work ? 4023 0

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    17 days
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  • 2
    11 days
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  • 3
    15 days
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  • 4
    16 days
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उत्तर : 3. "15 days"
व्याख्या :

Answer: C) 15 days Explanation: We know that Time is inversely proportional to Efficiency Here given time ratio of P & P+Q as P/P+Q = 150/100 = 3:2 Efficiency ratio of P & Q as P:Q = 2:1 ....(1) Given Efficiency ratio of Q & R as Q:R = 3:1 ....(2) From (1) & (2), we get P:Q:R = 6:3:1 P alone can finish the work in 22.5(3+1)/6 = 15 days.

प्र: Two trains, one from Hyderabd to Bangalore and the other from Bangalore to Hyderabad, start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. The ratio of their speeds is  ? 4020 0

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    3 : 4
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    4 : 3
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  • 3
    2 : 3
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  • 4
    3 : 2
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उत्तर : 2. "4 : 3"
व्याख्या :

Answer: B) 4 : 3 Explanation: Let us name the trains as A and B. Then, (A's speed) : (B's speed) = √b : √a = √16 : √9 = 4:3

प्र: A check returned by the bank marked nsf means 4016 0

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    Cheque has been forged
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  • 2
    Cheque can't be cashed being illegal
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    There are not sufficient funds in your accoun
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  • 4
    Bank can't verify your identity
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उत्तर : 3. "There are not sufficient funds in your accoun"
व्याख्या :

Answer: C) There are not sufficient funds in your accoun Explanation: NSF means - Not Sufficient Funds.

प्र: Emergence of two power blocs after the second world war. What are they? 4014 0

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उत्तर :
व्याख्या :

Emergence of two great power blocs: Two power blocs came into existence after the Second World War. The United States of America and Soviet Russia became two Super Powers. They tried to dominate over other countries in their own way. Ultimately, it gave a headache to the world.   The Cold War was a state of political and military tension after World War II between powers in the Western Bloc (the United States, its NATO allies and others) and powers in the Eastern Bloc (the Soviet Union and its allies in the Warsaw Pact).

प्र: The average age of a class is 19 years. While the average age of girls is 18 and that of boys is 21. If the number of girls in the class is 16, Find the number of Boys in the class? 4013 0

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    12
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    10
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    8
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    6
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उत्तर : 3. "8"
व्याख्या :

Answer: C) 8 Explanation: Let the number of boys = x From the given data, => [21x + 16(18)]/(x+16) = 19 => 21x - 19x = 19(16) - 16(18) => 2x = 16 => x = 8 Therefore, the number of boys in the class = 8.

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