IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: The sum of three numbers is 98. If the ratio of the first to the second is 2:3. And that of the second to the third is 5:8, then the second number is: 1541 05b5cc6dfe4d2b4197774eae9
5b5cc6dfe4d2b4197774eae9- 130true
- 227false
- 323false
- 433false
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उत्तर : 1. "30"
व्याख्या :
Answer: A) 30 Explanation: Then, A:B = 2:3 and B:C = 5:8= (5 x 3/5) : (8 x 3/5) = 3:24/5A:B:C = 2:3:24/5= 10:15:24 => B = 98 x 15/49 = 30.
प्र: The price of an article has been reduced by 35%. In order to restore the original price the new price must be increased by ? 1717 05b5cc6dfe4d2b4197774eae4
5b5cc6dfe4d2b4197774eae4- 151.8 %false
- 249.25 %false
- 347.2 %false
- 453.84 %true
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उत्तर : 4. "53.84 %"
व्याख्या :
Answer: D) 53.84 % Explanation: 100 65 -------65 ------- 35100 ------ ? => 53.84 %
प्र: When is International Day of Families observed ? 1773 05b5cc6dfe4d2b4197774eadf
5b5cc6dfe4d2b4197774eadf- 1May 13false
- 2May 15true
- 3May 16false
- 4May 14false
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उत्तर : 2. "May 15"
व्याख्या :
Answer: B) May 15 Explanation: 15 May. Theme of International Day of Family 2017 is “Families, education and well-being”.
प्र: What is the probability that a leap year has 53 Saturdays and 52 Sundays ? 2417 05b5cc6dfe4d2b4197774eada
5b5cc6dfe4d2b4197774eada- 11/7true
- 22/7false
- 31/2false
- 43/2false
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उत्तर : 1. "1/7"
व्याख्या :
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
प्र: 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 ? 1175 05b5cc6dfe4d2b4197774ead5
5b5cc6dfe4d2b4197774ead5- 1Bitcoinwarefalse
- 2Captivewarefalse
- 3Pay-offwarefalse
- 4Ransomwaretrue
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उत्तर : 4. "Ransomware"
व्याख्या :
Answer: D) Ransomware Explanation:
प्र: 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 ? 1682 05b5cc6dfe4d2b4197774ead0
5b5cc6dfe4d2b4197774ead0- 110 daystrue
- 214 daysfalse
- 311 daysfalse
- 49 daysfalse
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उत्तर : 1. "10 days"
व्याख्या :
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
प्र: A sum of money becomes 7/6 of itself in 3 years at a certain rate of simple interest. The rate per annum is ? 2277 05b5cc6dfe4d2b4197774eacb
5b5cc6dfe4d2b4197774eacb- 145/7 %false
- 250/9 %true
- 351/7 %false
- 447/ 9 %false
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उत्तर : 2. "50/9 %"
व्याख्या :
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 %.
प्र: On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is ? 1625 05b5cc6dfe4d2b4197774eac6
5b5cc6dfe4d2b4197774eac6- 1476190476false
- 248617false
- 347619true
- 44587962false
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उत्तर : 3. "47619"
व्याख्या :
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.

