IIT JEE Practice Question and Answer
8Q: A tank is filled in eight hours by three pipes K, L and M. Pipe K is twice as fast as pipe L, and L is twice as fast as M. How much time will pipe L alone take to fill the tank ? 1267 05b5cc6dfe4d2b4197774eaee
5b5cc6dfe4d2b4197774eaee- 132 hrsfalse
- 224 hrsfalse
- 328 hrstrue
- 426 hrsfalse
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Answer : 3. "28 hrs"
Explanation :
Answer: C) 28 hrs Explanation: 1/K + 1/L + 1/M = 1/8 (Given)Also given that K = 2L and L = 2M=> 1/2L + 1/L + 2/L = 1/8=> (1 + 2 + 4)/2L = 1/8=> 2L/7 = 8=> L = 28 hours.
Q: The price of an article has been reduced by 35%. In order to restore the original price the new price must be increased by ? 1546 05b5cc6dfe4d2b4197774eae4
5b5cc6dfe4d2b4197774eae4- 151.8 %false
- 249.25 %false
- 347.2 %false
- 453.84 %true
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Answer : 4. "53.84 %"
Explanation :
Answer: D) 53.84 % Explanation: 100 65 -------65 ------- 35100 ------ ? => 53.84 %
Q: When is International Day of Families observed ? 1549 05b5cc6dfe4d2b4197774eadf
5b5cc6dfe4d2b4197774eadf- 1May 13false
- 2May 15true
- 3May 16false
- 4May 14false
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Answer : 2. "May 15"
Explanation :
Answer: B) May 15 Explanation: 15 May. Theme of International Day of Family 2017 is “Families, education and well-being”.
Q: What is the probability that a leap year has 53 Saturdays and 52 Sundays ? 2047 05b5cc6dfe4d2b4197774eada
5b5cc6dfe4d2b4197774eada- 11/7true
- 22/7false
- 31/2false
- 43/2false
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Answer : 1. "1/7"
Explanation :
Answer: A) 1/7 Explanation: A leap year has 52 weeks and two daysTotal number of cases = 7Number of favourable cases = 1i.e., {Friday, Saturday} Required Probability = 1/7
Q: Name the malicious software that affected various computers recently in may 2017, and restricted users to access it until a ransom is paid to unlock it ? 1024 05b5cc6dfe4d2b4197774ead5
5b5cc6dfe4d2b4197774ead5- 1Bitcoinwarefalse
- 2Captivewarefalse
- 3Pay-offwarefalse
- 4Ransomwaretrue
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Answer : 4. "Ransomware"
Explanation :
Answer: D) Ransomware Explanation:
Q: A laborer is engaged for 30 days on the condition that he receives Rs.25 for each day he works and is fined Rs.7.50 for each day is absent. He gets Rs.425 in all. For how many days was he absent ? 1526 05b5cc6dfe4d2b4197774ead0
5b5cc6dfe4d2b4197774ead0- 110 daystrue
- 214 daysfalse
- 311 daysfalse
- 49 daysfalse
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Answer : 1. "10 days"
Explanation :
Answer: A) 10 days Explanation: For 30 days he receives 30 x 25 = 750 Actually he gets 425 Therefore, Fine is 750 - 425 = 325 => No of days absent = 325/(25+7.50)= 10
Q: A sum of money becomes 7/6 of itself in 3 years at a certain rate of simple interest. The rate per annum is ? 2050 05b5cc6dfe4d2b4197774eacb
5b5cc6dfe4d2b4197774eacb- 145/7 %false
- 250/9 %true
- 351/7 %false
- 447/ 9 %false
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Answer : 2. "50/9 %"
Explanation :
Answer: B) 50/9 % Explanation: Let sum = S. Then, amount = 7S/6 S.I. = 7S/6 - S = S/6; Time = 3 years. Rate = (100 x S) / (S x 6 x 3) = 5 5/9 = 50/9 %.
Q: On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is ? 1462 05b5cc6dfe4d2b4197774eac6
5b5cc6dfe4d2b4197774eac6- 1476190476false
- 248617false
- 347619true
- 44587962false
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Answer : 3. "47619"
Explanation :
Answer: C) 47619 Explanation: By hit and trail, we find that 47619 x 7 = 333333. 7) 333333 (47619 333333---------------- 0 And 476190476 x 7 = 3333333333 but smallest number is 47619.