IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: A Cricket team of 23 people all shake hands with each other exactly once. How many hand shakes occur ? 3336 0

  • 1
    142
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  • 2
    175
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  • 3
    212
    सही
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  • 4
    253
    सही
    गलत
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उत्तर : 4. "253"
व्याख्या :

Answer: D) 253 Explanation: The first person shakes hands with 22 different people, the second person also shakes hands with 22 different people, but one of those handshakes was counted in the 22 for the first person, so the second person actually shakes hands with 21 new people. The third person, 20 people, and so on... So, 22 + 21 + 20 + 19 + 18 + 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1= n(n+1)/2 = 22 x 23 /2 = 11 x 23 = 253.

प्र: Dhanraj Pillay is related to which sports ? 3334 0

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    Cricket
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  • 2
    Hockey
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  • 3
    Golf
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  • 4
    Football
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उत्तर : 2. "Hockey"
व्याख्या :

Answer: B) Hockey Explanation: Dhanraj Pillay is a retired Indian field hockey player and former captain of the Indian national team.He currently serves as the manager of the team.

प्र: The ratio of male and female in a city is 7 : 8 respectively and percentage of children among male and female is 25 and 20 respectively. If number of adult females is 156800, what is the total population of the city? 3331 0

  • 1
    4,12,480
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  • 2
    3,67,500
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  • 3
    5,44,700
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    गलत
  • 4
    2,98,948
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उत्तर : 2. "3,67,500"
व्याख्या :

Answer: B) 3,67,500 Explanation: Let the total population be 'p' Given ratio of male and female in a city is 7 : 8 In that percentage of children among male and female is 25% and 20% => Adults male and female % = 75% & 80% But given adult females is = 156800 => 80%(8p/15) = 156800 => 80 x 8p/15 x 100 = 156800 => p = 156800 x 15 x 100/80 x 8 => p = 367500 Therefore, the total population of the city = p = 367500

प्र: Amith can row a boat d km upstream and the same distance downstream in 5 hours 15 minutes. Also, he can row the boat 2d km upstream in 7 hours. How long will it take to row the same distance 2d km downstream for Amith ? 3329 0

  • 1
    4 hrs 10 min
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  • 2
    3 hrs 15 min
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  • 3
    3 hrs 30 min
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  • 4
    4 hrs 1 min
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उत्तर : 3. "3 hrs 30 min"
व्याख्या :

Answer: C) 3 hrs 30 min Explanation: Let the speed of boat and stream be x and y kmph respectively. According to question d/x+y + d/x-y = 5h 15m or 21/4 hrs ......(i) and 2d/x-y = 7...... (ii) From eq. (i) and (ii) 2d/x+y = 7/2 Hence, Amith will take to row 2d km distance downstream in 7/2 hrs = 3.5 hrs = 3 hrs 30 min.

प्र: The accounting software Tally was developed by 3315 0

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    Wipro
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  • 2
    TCS
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  • 3
    HCL
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  • 4
    Infosys
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उत्तर : 2. "TCS"
व्याख्या :

Answer: B) TCS Explanation: Tally is one of the best business accounting software for accounting, inventory, payroll. It is economical and one of the most popular ERP software solutions available in the industry. Tally, an accounting software was developed by the multinational company TCS - Tata Consultancy Services.

प्र: Rs. 2600 is divided into three parts A, B and C. How much A is more than C if their ratio is 1/2:1/3:1/4 ? 3314 0

  • 1
    600
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  • 2
    300
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  • 3
    150
    सही
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  • 4
    75
    सही
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उत्तर : 1. "600"
व्याख्या :

Answer: A) 600 Explanation: 1/2:1/3:1/4 = 6:4:3 As the difference is 3 => 3/13x2600 = 600

प्र: In a certain code DOWN is written as '5@9#' and NAME is written as '#6%3'. How is MODE written in that code ? 3311 0

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    6@53
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  • 2
    %@53
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  • 3
    53%#
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  • 4
    %#35
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उत्तर : 2. "%@53"
व्याख्या :

Answer: B) %@53 Explanation: From the given information : D O W N A M E == 5 @ 9 # 6 % 3 MODE = %@53

प्र: Suppose today is Friday, what day of the week will it be 65 days from now? 3311 0

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    Saturday
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  • 2
    Sunday
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  • 3
    Friday
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  • 4
    Thursday
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उत्तर : 2. "Sunday"
व्याख्या :

Answer: B) Sunday Explanation: The day of the week repeats every 7 days. Given today is Friday. Again Friday is repeated on the 7th day, 14th,... on 7 multiple days. Hence, Friday is on the 63rd day, as 63 is multiple of 7.   Now, the required day of the week on the 65th day is Sunday.

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