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प्र: Rajesh rows in still water with a speed of 4.5 kmph to go to a certain place and comes back. Find his average speed for the whole journey, if the river is flowing with a speed of 1.5 kmph? 2496 0

  • 1
    2 kmph
    सही
    गलत
  • 2
    4 kmph
    सही
    गलत
  • 3
    6 kmph
    सही
    गलत
  • 4
    8 kmph
    सही
    गलत
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उत्तर : 2. "4 kmph"
व्याख्या :

Answer: B) 4 kmph Explanation: Let the distance in one direction = k kms Speed in still water = 4.5 kmph Speed of river = 1.5 Hence, speed in upstream = 4.5 - 1.5 = 3 kmph Speed in downstream = 4.5 + 1.5 = 6 kmph Time taken by Rajesh to row upwards = k/3 hrs Time taken by Rajesh to row downwards = k/6 hrs Now, required Average speed =Total distanceTotal speed = 2kk3 + k6 = 2k x 186k + 3k = 4 kmph    Therefore, the average speed of the whole journey = 4kmph.

प्र: Rajan's present age is three times his daughter's and nine-thirteenth of his mother's present age. The sum of the present ages of all three of them is 125 years. What is the difference between the present ages of Rajan's daughter and Rajan's mather ? 2494 0

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    32 years
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    गलत
  • 2
    48 years
    सही
    गलत
  • 3
    62 years
    सही
    गलत
  • 4
    50 years
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उत्तर : 4. "50 years"
व्याख्या :

Answer: D) 50 years Explanation: Let Rajan's present age be 'x' years.=> Then his daughter's present age is = x/3 years.His mother's present age = 13x/9 yearsNow, according to the question,x + x/3 + 13x/9 = 125=> x = 125x9/25 = 45Therefore, required difference = 13x/9 - x/3 = 13x - 3x/9 = 10x/9=> 10 x 45/9 = 50 years.

प्र: If two fractions, each of which has a value between 0 and 1, are multiplied together, the product will be : 2494 0

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    always greater than either of the original fractions
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  • 2
    always less than either of the original fractions
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  • 3
    sometimes greater and sometimes less than either of the original fractions
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  • 4
    remains the same
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उत्तर : 2. "always less than either of the original fractions"
व्याख्या :

Answer: B) always less than either of the original fractions Explanation: We can easily Answer this by taking some values.   The question states that the two fractions, each have values between 0 and 1.Let us say one of the fraction is 1/2 and the other fraction is 1/3 .The product of the two fractions is 1/2 x 1/3 = 1/6 . is lesser than both 1/2  and 1/3 .So, the correct answer is that the product is always less than either of the original fractions.

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उत्तर : 4. "JXK 12L"
व्याख्या :

Answer: D) JXK 12L Explanation: The four women seem to agree that the plate starts out with the letter J. Three of them agree that the plate ends with 12L. Three of them think that the second letter is X, and a different three think that the third letter is K. The plate description that has all of these common elements is D.

प्र: Which state has established India's first Centre for Animal Law  ? 2492 0

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    Madhya Pradesh
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  • 2
    Uttar Pradesh
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    गलत
  • 3
    Maharashtra
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  • 4
    Telangana
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उत्तर : 4. "Telangana"
व्याख्या :

Answer: D) Telangana Explanation:

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 ? 2492 0

  • 1
    Rs. 17.80
    सही
    गलत
  • 2
    Rs. 16.30
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    गलत
  • 3
    Rs. 14
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    गलत
  • 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.

प्र: The Opium war id held between which two countries  ? 2490 0

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    England and France
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  • 2
    China and Russia
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  • 3
    Russia and England
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    गलत
  • 4
    China and England
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उत्तर : 4. "China and England"
व्याख्या :

Answer: D) China and England Explanation: The Opium Wars were two wars in the mid-19th century involving Anglo-Chinese disputes over British trade in China and China’s sovereignty. The disputes included the First Opium War (1839–1842) and the Second Opium War (1856–1860).

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उत्तर : 3. "None follows"
व्याख्या :

Answer: C) None follows Explanation:

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