IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: The average age of A and B, 2 years ago was 26. If the age of A, 5 years hence is 40 yrs, and B is 5 years younger to C, then find the difference between the age of A and C? 2182 0

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    11 yrs
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    9 yrs
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  • 3
    7 yrs
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  • 4
    13 yrs
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उत्तर : 2. "9 yrs"
व्याख्या :

Answer: B) 9 yrs Explanation: Let the present ages of A and B be 'x' and 'y' respectively From the given data,  [(x-2) + (y-2)]/2 = 26 => x+y = 56 But given the age of A, 5 years hence is 40 yrs => present age of A = 40 - 5 = 35 yrs => x = 35 => y = 56 - 35 = 21 => Age of B = 21 yrs Given B is 5 years younger to C, => Age of C = 21 + 5 = 26 yrs => Required Difference between ages of A and C = 35 - 26 = 9 yrs.

प्र: Plants mainly receive their nutrients from 1572 0

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    Sun light
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  • 2
    Soil
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    Pesticides
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  • 4
    Chlorophyll
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उत्तर : 2. "Soil"
व्याख्या :

Answer: B) Soil Explanation: Plants receive their nutrients mainly from Soil. Because Soil contains all Minerals, Water, Humus and some useful Microbes which are responsible for the proper Growth of the Plants.

प्र: A circular piece of thin wire is converted into a rhombus of side 11 cm. Find the diameter of the circular piece? 2244 0

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    28 cm
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  • 2
    3.5 cm
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  • 3
    7 cm
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  • 4
    14 cm
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उत्तर : 4. "14 cm"
व्याख्या :

Answer: D) 14 cm Explanation: Circular piece is 4 x 11 = 44 cm long, Then Circumference of circle is given by, 44 = pi x D, where D is the diameter D = 44 / pi Take pi = 22 / 7, then D = 44 / (22/7) = (44 x 7) / 22 D = 14 cm.

प्र: 1397 x 1397 = ? Here what replaces '?' 1888 0

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    1951609
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    1821504
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  • 3
    2031489
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  • 4
    1847879
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उत्तर : 1. "1951609"
व्याख्या :

Answer: A) 1951609 Explanation: 1397 x 1397

प्र: First Afghan War took place in the year 1388 0

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    1849
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  • 2
    1839
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    1858
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  • 4
    1869
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उत्तर : 2. "1839"
व्याख्या :

Answer: B) 1839 Explanation: The First Anglo-Afghan War also known as Disaster in Afghanistan was fought between British imperial India and The Emirate of Afghanistan from 1839 to 1842. A British-Indian force attacks Ghazni fort during the First Afghan War, 1839.

प्र: 7 years ago, the ratio of the ages of Anirudh to that of Bhavana, was 7:9. Chandhu is 12 years older than Anirudh and 12 years younger than Bhavana. What is Chandhu's present age? 1999 0

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    91 years
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  • 2
    115 years
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  • 3
    103 years
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  • 4
    Can't be determined
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उत्तर : 3. "103 years"
व्याख्या :

Answer: C) 103 years Explanation: Let present Anirudh's age be 'A' and Bhavana's age be 'B' Given seven years, their ratio is 7:9 => A-7 : B-7 = 7 : 9 => 9A - 7B = 14 .......(1) And given, Chandhu is 12 years older than A nad 12 years younger than B => C = A + 12....(2) => B = C + 12 => B = A + 12 + 12 .....(From (2)) => B = A + 24 ....(3) Put (3) in (1) 9A - 7(A+24) = 14 9A - 7A - 168 = 14 2A = 182 => A = 91 years => C = A + 12 = 91 +12 = 103 years.

प्र: Sanjeev ranks seventh from the top and twenty eighth from the bottom in a class. How many students are there in the class? 1609 0

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    33
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  • 2
    36
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  • 3
    35
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  • 4
    34
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उत्तर : 4. "34"
व्याख्या :

Answer: D) 34 Explanation: Total number of students in the class = 28 + 6 i.e, from top(7-1) 28 + 6 = 34

प्र: A milkman claims to sell milk at its cost price, still, he is making a profit of 30% since he has mixed some amount of water in the milk. What is the % of milk in the mixture? 3652 0

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    71.02%
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  • 2
    76.92%
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  • 3
    63.22%
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  • 4
    86.42%
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उत्तर : 2. "76.92%"
व्याख्या :

Answer: B) 76.92% Explanation: Let the milk he bought is 1000 ml Let C.P of 1000 ml is Rs. 100 Here let he is mixing K ml of water He is getting 30% profit => Now, the selling price is also Rs. 100 for 1000 ml => 100 : K% = 100 : 30 10 : 3 is ratio of milk to water => Percentage of milk = 10 x 100/13 = 1000/13 = 76.92%

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