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 is based on 2462 05b5cc62ce4d2b4197774b923
5b5cc62ce4d2b4197774b923- 1OS/2false
- 2UNIXfalse
- 3WINDOWStrue
- 4DOSfalse
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Answer : 3. "WINDOWS"
Explanation :
Answer: C) WINDOWS Explanation: Microsoft Excel is a spreadsheet developed by Microsoft for Windows, macOS, Android and iOS. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications.
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