IIT JEE प्रश्न और उत्तर का अभ्यास करें

नवीनतमलोकप्रियमूल्यांकनपेज देखें 63 of 416कुल सवाल 3327 जॉइन Examsbook

प्र: The average of the ages of Sumit, Krishna and Rishabh is 43 years and the average of the ages of Sumit, Rishabh and Rohit is 49 years. If Rohit is 54 years old, what is Krishna'a age ? 2184 0

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    48 yrs
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    42 yrs
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  • 3
    40 yrs
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  • 4
    36 yrs
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उत्तर : 4. "36 yrs"
व्याख्या :

Answer: D) 36 yrs Explanation: Let present ages of Sumit=w, Krishna=x, Rishabh=y and Rohit=z , thenw+x+y = 43x3 = 129 ---(i) andw+y+z = 49x3 = 147 ---(ii)Subtracting (i) from (ii), (w+y+z) - (w+x+y)=147 -129 , z- x =18 ---(iii)Given Rohit's age => z = 54, so from (iii), x = 54-18 = 36

प्र: 4 men can repair a road in 7 hours. How many men are required to repair the road in 2 hours ? 10659 0

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    17 men
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    14 men
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  • 3
    13 men
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  • 4
    16 men
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उत्तर : 2. "14 men"
व्याख्या :

Answer: B) 14 men Explanation: M x T / W = Constantwhere, M= Men (no. of men)T= Time takenW= Work loadSo, here we applyM1 x T1/ W1 = M2 x T2 / W2Given that, M1 = 4 men, T1 = 7 hours ; T2 = 2 hours, we have to find M2 =?Note that here, W1 = W2 = 1 road, ie. equal work load.Clearly, substituting in the above equation we get, M2 = 14 men.

प्र: Which of the following birds is the state bird of three Indian states ? 8129 0

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    Great Hornbill
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    Greater Flamingo
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    Hill Mynah
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    Blue Jay (Indian Roller)
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उत्तर : 4. "Blue Jay (Indian Roller)"
व्याख्या :

Answer: D) Blue Jay (Indian Roller) Explanation: The 3 states are Andhra Pradesh, Karnataka and Odisha.

प्र: In a group of persons travelling in a bus, 6 persons can speak Tamil, 15 can speak Hindi and 6 can speak Gujarati. In that group, none can speak any other language. If 2 persons in the group can speak two languages and one person can speak all the three languages, then how many persons are there in the group ? 6748 0

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    21
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  • 2
    22
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  • 3
    23
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  • 4
    24
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उत्तर : 3. "23"
व्याख्या :

Answer: C) 23 Explanation: Let us assume the two persons who can speak two languages speak Hindi and Tamil. The third person then speaks all the three languages. Tamil – Number of persons who can speak is 6. Only Tamil 6 – 2 – 1 = 3 Hindi - Number of persons who can speak is 15. Only Hindi 15 – 2 – 1 12 Gujarati – Number of persons who can speak is 6. Only Gujarati 6 – 1 = 5 Thus the number of persons who can speak only one language is 3 + 12 + 5 = 20 Number of persons who can speak two languages = 2 Number of person who an speak all the languages = 1 Total number of persons = 23.

प्र: Find the next number in te given series ? 5, 25, 61, 113, ... 6099 0

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    142
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    181
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  • 3
    156
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  • 4
    179
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उत्तर : 2. "181"
व्याख्या :

Answer: B) 181 Explanation: Here the series follow the rule that 12+22 = 5 32+42 = 2552+62 = 61 72+82 = 113   SO NEXT IS, 92+102 = 181

प्र: Find the missing alphabet in the given sequence ? A, Z, Y, B, C, ?, W, D 4556 0

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    E
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    Z
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  • 3
    X
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    F
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उत्तर : 3. "X"
व्याख्या :

Answer: C) X Explanation: first letter A with last letter Zsimilarly 2nd last letter Y with 2nd letter BNow 3rd letter C with 3rd last letter X4th last letter W with 4th letter D and so on.... Therefore the missing letter is X

प्र: Find the remainder when 629 is divided by 5 ? 1388 0

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    0
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    1
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    3
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  • 4
    5
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उत्तर : 2. "1"
व्याख्या :

Answer: B) 1 Explanation: All powers of 6 has 6 in units place so answer will definitely be 1.

प्र: In a street, there are certain number of houses. People in that street are decided to paint their houses with certain colours. If four houses are painted with each colour, then one house will be left without any colour. If five houses are painted with each colour, then one colour will remain. Find the number of houses in that street ? 1934 0

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    25
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  • 2
    6
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  • 3
    32
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  • 4
    7
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उत्तर : 1. "25"
व्याख्या :

Answer: A) 25 Explanation: Let x be number of houses and y be colors. on the basis of question x = 4y+1x = 5(y-1)on solving these 2 equations x = 25

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