IIT JEE Practice Question and Answer
8Q: Two pipes A and B can fill a tank in 16 hrs and 12 hrs respectively. The capacity of the tank is 240 liters. Both the pipes are opened simultaneously and closed after 2 hrs. How much more water need to fill the tank? 2471 05b5cc6bbe4d2b4197774d802
5b5cc6bbe4d2b4197774d802- 170 litfalse
- 2170 littrue
- 390 litfalse
- 4190 litfalse
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Answer : 2. "170 lit"
Explanation :
Answer: B) 170 lit Explanation: Given A alone can fill the tank of capacity 240 lit in 16 hrs. => A can fill in 1 hr = 240/16 = 15 lit => B alone can fill the tank of capacity 240 lit in 12 hrs. => B can fill in 1 hr = 240/12 = 20 lit Now, (A + B) in 1 hr = 15 + 20 = 35 lit But they are opened for 2 hrs => 2 x 35 = 70 lit rae filled Remaining water to be filled in tank of 240 lit = 240 - 70 = 170 lit.
Q: Which of the following is not a function of saliva? 2469 05b5cc61ee4d2b4197774b75d
5b5cc61ee4d2b4197774b75d- 1contains fluoride to harden the tooth enameltrue
- 2moistens food and helps stick it together to make it easier to swallowfalse
- 3begins the chemical breakdown of starchesfalse
- 4helps clean the mouthfalse
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Answer : 1. "contains fluoride to harden the tooth enamel"
Explanation :
Answer: A) contains fluoride to harden the tooth enamel Explanation: Saliva is produced by the salivary gland which helps in food digestion. Option A) contains fluoride to harden the tooth enamel is not the function of saliva.
Q: There are 600 Kabaddi players 4% wear knee band on one leg. Of the remaining, 25% wear knee bands on both legs. How many players don't wear a knee band ? 2467 05b5cc741e4d2b4197774f9db
5b5cc741e4d2b4197774f9db- 1426false
- 2428false
- 3415false
- 4432true
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Answer : 4. "432"
Explanation :
Answer: D) 432 Explanation: There are 600 Kabaddi players4% wear knee band on one legRemaining players = 600 x 0.96 = 576Of the remaining, 25% wear knee bands on both leg and Of the remaining, 75% do not wear knee bands .So players not wearing knee bands = 0.75 x 576 = 576 x 3/4 = 144 x 3 = 432.
Q: The ratio of boys and girls in a school is 9:5.If the total number of students in the school is 1050.Then number of boys is 2465 05b5cc6b8e4d2b4197774d642
5b5cc6b8e4d2b4197774d642- Show AnswerHide 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: Rajeev's age after 15 years will be 5 times his age 5 years back. What is the present age of rajeev? 2464 05b5cc655e4d2b4197774bd70
5b5cc655e4d2b4197774bd70- 112false
- 214false
- 322false
- 410true
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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: Find the Missing number in the given number series? 5, 9, 15, 23, ?, 45 2462 05b5cc6a7e4d2b4197774ce1d
5b5cc6a7e4d2b4197774ce1d- 133true
- 229false
- 331false
- 435false
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Answer : 1. "33"
Explanation :
Answer: A) 33 Explanation: The given series follows a pattern that, +4, +6, +8, +10, +12... 5 5 + 4 = 9 9 + 6 = 15 15 + 8 = 23 23 + 10 = 33 33 + 12 = 45 Hence, the missing number in the series is 33.
Q: MS-EXCEL पर आधारित है 2462 05b5cc62ce4d2b4197774b923
5b5cc62ce4d2b4197774b923- 1OS/2false
- 2UNIXfalse
- 3WINDOWStrue
- 4DOSfalse
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Answer : 3. "WINDOWS"
Explanation :
Answer: C) WINDOWS व्याख्या: Microsoft Excel एक स्प्रेडशीट है जिसे Microsoft द्वारा Windows, macOS, Android और iOS के लिए विकसित किया गया है। इसमें गणना, रेखांकन उपकरण, पिवट टेबल और अनुप्रयोगों के लिए विजुअल बेसिक नामक एक मैक्रो प्रोग्रामिंग भाषा शामिल है।
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? 2460 15b5cc7d1e4d2b4197775129f
5b5cc7d1e4d2b4197775129f- 12880true
- 21440false
- 3720false
- 42020false
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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