IIT JEE Practice Question and Answer
8Q: 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 ? 2077 05b5cc71be4d2b4197774f4f4
5b5cc71be4d2b4197774f4f4- 148 yrsfalse
- 242 yrsfalse
- 340 yrsfalse
- 436 yrstrue
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Answer : 4. "36 yrs"
Explanation :
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
Q: 4 men can repair a road in 7 hours. How many men are required to repair the road in 2 hours ? 10467 05b5cc718e4d2b4197774f4ef
5b5cc718e4d2b4197774f4ef- 117 menfalse
- 214 mentrue
- 313 menfalse
- 416 menfalse
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Answer : 2. "14 men"
Explanation :
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.
Q: Which of the following birds is the state bird of three Indian states ? 7745 05b5cc718e4d2b4197774f4e5
5b5cc718e4d2b4197774f4e5- 1Great Hornbillfalse
- 2Greater Flamingofalse
- 3Hill Mynahfalse
- 4Blue Jay (Indian Roller)true
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Answer : 4. "Blue Jay (Indian Roller)"
Explanation :
Answer: D) Blue Jay (Indian Roller) Explanation: The 3 states are Andhra Pradesh, Karnataka and Odisha.
Q: 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 ? 6599 05b5cc718e4d2b4197774f4d6
5b5cc718e4d2b4197774f4d6- 121false
- 222false
- 323true
- 424false
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Answer : 3. "23"
Explanation :
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.
Q: Find the next number in te given series ? 5, 25, 61, 113, ... 5858 05b5cc718e4d2b4197774f4d1
5b5cc718e4d2b4197774f4d1- 1142false
- 2181true
- 3156false
- 4179false
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Answer : 2. "181"
Explanation :
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
Q: Find the missing alphabet in the given sequence ? A, Z, Y, B, C, ?, W, D 4370 05b5cc718e4d2b4197774f4b3
5b5cc718e4d2b4197774f4b3- 1Efalse
- 2Zfalse
- 3Xtrue
- 4Ffalse
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Answer : 3. "X"
Explanation :
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
Q: Find the remainder when 629 is divided by 5 ? 1199 05b5cc718e4d2b4197774f4ae
5b5cc718e4d2b4197774f4ae- 10false
- 21true
- 33false
- 45false
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Answer : 2. "1"
Explanation :
Answer: B) 1 Explanation: All powers of 6 has 6 in units place so answer will definitely be 1.
Q: 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 ? 1830 05b5cc718e4d2b4197774f4a9
5b5cc718e4d2b4197774f4a9- 125true
- 26false
- 332false
- 47false
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Answer : 1. "25"
Explanation :
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