Practice Question and Answer

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Answer :
Explanation :

Let the ratio be 'R' Total number of students = 1050 Then, 9R + 5R = 1050 14R = 1050 => R = 75   Hence, the number of boys = 9R = 9 x 75 = 675

Q: 5 men and 4 women are to be seated in a row so that the women occupy the even places . How many such arrangements are possible? 2438 1

  • 1
    2880
    Correct
    Wrong
  • 2
    1440
    Correct
    Wrong
  • 3
    720
    Correct
    Wrong
  • 4
    2020
    Correct
    Wrong
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Answer : 1. "2880"
Explanation :

Answer: A) 2880 Explanation: There are total 9 places out of which 4 are even and rest 5 places are odd.   4 women can be arranged at 4 even places in 4! ways.   and 5 men can be placed in remaining 5 places in 5! ways.   Hence, the required number of permutations  = 4! x 5! = 24 x 120 = 2880

Q:

यदि 80 लीटर दूध के घोल में 60% दूध है, तो घोल में दूध 80% करने के लिए कितना दूध मिलाया जाना चाहिए?

2438 0

  • 1
    70 लीटर
    Correct
    Wrong
  • 2
    50 लीटर
    Correct
    Wrong
  • 3
    60 लीटर
    Correct
    Wrong
  • 4
    80 लीटर
    Correct
    Wrong
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Answer : 4. "80 लीटर "

Q:

जब दो लोग आपस मे बात करते हैं तब कितने डेसिबल की ध्वनि उत्पन्न होती है? 

2437 0

  • 1
    लगभग 30 डेसिबल
    Correct
    Wrong
  • 2
    लगभग 100 डेसिबल
    Correct
    Wrong
  • 3
    लगभग 5 डेसिबल
    Correct
    Wrong
  • 4
    लगभग 10 डेसिबल
    Correct
    Wrong
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Answer : 1. "लगभग 30 डेसिबल "

Q: Rajeev's age after 15 years will be 5 times his age 5 years back. What is the present age of rajeev? 2437 0

  • 1
    12
    Correct
    Wrong
  • 2
    14
    Correct
    Wrong
  • 3
    22
    Correct
    Wrong
  • 4
    10
    Correct
    Wrong
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Answer : 4. "10"
Explanation :

Answer: D) 10 Explanation: Let Rajeev's present age be  x years. Rajeev's age after 15 years = (x + 15) years. Rajeev's age 5 years back = (x - 5) years Then ATQ,  x + 15 = 5 (x - 5) x + 15 = 5x - 25 => x = 10   Hence, Rajeev's present age = x = 10 years.

Q:

कथन : 

कुछ जंगली मांसाहारी है । 

सभी जंगली शेर है । 

निष्कर्षः 

I. सभी जंगली मांसाहारी है । 

II. कुछ शेर मांसाहारी है । 

2437 0

  • 1
    दोनों निष्कर्ष I और II सही है ।
    Correct
    Wrong
  • 2
    ना तो निष्कर्ष I सही है ना ही निष्कर्ष II
    Correct
    Wrong
  • 3
    केवल निष्कर्ष I सही है ।
    Correct
    Wrong
  • 4
    केवल निष्कर्ष II सही है ।
    Correct
    Wrong
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Answer : 4. "केवल निष्कर्ष II सही है । "

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