IIT JEE Practice Question and Answer
8Q: Cutting and peeling of onion brings tears to the eyes because of the presence of _____ ? 2608 05b5cc6c4e4d2b4197774dccd
5b5cc6c4e4d2b4197774dccd- 1Amino acidfalse
- 2Sulfurtrue
- 3Carbonfalse
- 4Fatfalse
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Answer : 2. "Sulfur"
Explanation :
Answer: B) Sulfur Explanation: Cutting and Peeling of onion brings Tears to the eyes because of presence of Sulphur in the cell.
Q: When was Uttarakhand separated from Uttar pradesh to form new state ? 1456 05b5cc6c4e4d2b4197774dcc8
5b5cc6c4e4d2b4197774dcc8- 11997false
- 21998false
- 31999false
- 42000true
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Answer : 4. "2000"
Explanation :
Answer: D) 2000 Explanation:
Q: A train travelling at 48 kmph crosses another train, having half its length and travelling in opposite direction at 42 kmph, in 12 sec. It also covers a bridge in 45 sec. Find the length of the bridge ? 1206 05b5cc6c4e4d2b4197774dcc3
5b5cc6c4e4d2b4197774dcc3- 1250 mtsfalse
- 2400 mtstrue
- 3320 mtsfalse
- 4390 mtsfalse
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Answer : 2. "400 mts"
Explanation :
Answer: B) 400 mts Explanation: Let the length of the 1st train = L mts Speed of 1st train = 48 kmph Now the length of the 2nd train = L/2 mts Speed of 2nd train = 42 kmph Let the length of the bridge = D mts Distance = L + L/2 = 3L/2 Relative speed = 48 + 42 = 90 kmph = 90 x 5/18 = 25 m/s(opposite) Time = 12 sec => 3L/2x25 = 12 => L = 200 mts Now it covers the bridge in 45 sec => distance = D + 200 Time = 45 sec Speed = 48 x5/18 = 40/3 m/s => D + 200/(40/3) = 45 => D = 600 - 200 = 400 mts Hence, the length of the bridge = 400 mts.
Q: If K earns 12% less than L, then how much percent more does L earn than K ? 1384 05b5cc6c4e4d2b4197774dcb8
5b5cc6c4e4d2b4197774dcb8- 113.96%false
- 213.63%true
- 313.56%false
- 414.01%false
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Answer : 2. "13.63%"
Explanation :
Answer: B) 13.63% Explanation: Required % is given by => 12100-12x100 = 1200/88 = 13.636%
Q: To fill 8 vacancies there are 15 candidates of which 5 are from ST. If 3 of the vacancies are reserved for ST candidates while the rest are open to all, Find the number of ways in which the selection can be done ? 1111 05b5cc6c4e4d2b4197774dcb3
5b5cc6c4e4d2b4197774dcb3- 17920true
- 274841false
- 314874false
- 410213false
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Answer : 1. "7920"
Explanation :
Answer: A) 7920 Explanation: ST candidates vacancies can be filled by C35 ways = 10 Remaining vacancies are 5 that are to be filled by 12 => C512= (12x11x10x9x8)/(5x4x3x2x1) = 792 Total number of filling the vacancies = 10 x 792 = 7920
Q: What value will come in place of question mark (?) in the number - series given below ? 4, 30, ?, 1440, 7195, 71940 1415 05b5cc6c4e4d2b4197774dca9
5b5cc6c4e4d2b4197774dca9- 1145true
- 2545false
- 3650false
- 4999false
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Answer : 1. "145"
Explanation :
Answer: A) 145 Explanation: 4 30 ? 1440 7195 71940 Here the given series follows a pattern of 4 4 x 10 - 10 = 30 30 x 5 - 5 = 145 145 x 10 - 10 = 1440 1440 x 5 - 5 = 7195 7195 x 10 - 10 = 71940 Hence, the missing number is 145
Q: In the following question four words are given of which two words are most nearly the same or opposite in meaning. Find the two words. ( 1286 05b5cc6c4e4d2b4197774dc9a
5b5cc6c4e4d2b4197774dc9a- 1Soft (false
- 2Fatiguing (true
- 3Discordant (false
- 4Forcefalse
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Answer : 2. "Fatiguing ("
Explanation :
Answer: B) A-C Explanation: Meaning of Discordant = Harsh That implies Harsh opposite is soft.
Q: The question given below contain two statements giving certain data. You have to decide whether the data given in the statements are sufficient for answering the question ? Question : What is the height of a right-angled triangle ? Statements : A. The area of the triangle is 20 times its base. B. The perimeter of the triangle is equal to that of a square of the side 10 cm. 1457 05b5cc6c4e4d2b4197774dc90
5b5cc6c4e4d2b4197774dc90- 1Only statement A is requiredtrue
- 2Only statement B is requiredfalse
- 3Both A & B are requiredfalse
- 4Neither (false
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Answer : 1. "Only statement A is required"
Explanation :
Answer: A) Only statement A is required Explanation: From statement (A), 20b = (1/2) × b × h h = 40 cm.