GATE Practice Question and Answer
8Q: Two trains of equal length are running on parallel lines in the same direction at 36 km/hr and 26 km/hr. The faster train passes the slower train in 36 sec. The length of each train is ? 1587 05b5cc6e0e4d2b4197774eb93
5b5cc6e0e4d2b4197774eb93- 128 mtsfalse
- 254 mtsfalse
- 324 mtsfalse
- 450 mtstrue
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Answer : 4. "50 mts"
Explanation :
Answer: D) 50 mts Explanation: Let the length of each train be x mts. Then, distance covered = 2x mts. Relative speed = 36 - 26 = 10 km/hr. = 10 x 5/18 = 25/9 m/sec. 2x/36 = 25/9 => x = 50 mts.
Q: If 2 men and 3 women can do a piece of work in 8 days and 3 men and 2 women in 7 days. In how many days can the work be done by 5 men and 4 women working together? 1585 05b5cc6bde4d2b4197774d924
5b5cc6bde4d2b4197774d924- 13 daysfalse
- 26 daysfalse
- 34 daystrue
- 42 daysfalse
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Answer : 3. "4 days"
Explanation :
Answer: C) 4 days Explanation: From the given data, => (2 M + 3W) 8 = (3M + 2W)7 => 16M + 24W = 21M + 14 W => 10W = 5M => 2W = M => 14W × ? = 7W × 8 ? = 4 days
Q: Pointing to a photograph, a woman says, "This man's son's sister is my mother-in-law." How is the woman's husband related to the man in the photograph ? 1585 05b5cc758e4d2b4197774fbea
5b5cc758e4d2b4197774fbea- 1sonfalse
- 2nephewfalse
- 3grandsontrue
- 4son-in-lawfalse
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Answer : 3. "grandson"
Explanation :
Answer: C) grandson Explanation: Man's son's sister---Man's daughter.So, the man's daughter is the mother of the woman's husband. Thus, the woman's husband is the grandson of the man in the photograph.
Q: What should come in place of question mark (?) in the following number series? 38, 195, ?, 4905, 24530, 122655 1584 05b5cc6c4e4d2b4197774dcd2
5b5cc6c4e4d2b4197774dcd2- 1980true
- 2885false
- 3824false
- 41021false
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Answer : 1. "980"
Explanation :
Answer: A) 980 Explanation: The given series follows the pattern that, ×5+5, ×5+5, ×5+5, ×5+5, ×5+5 38 x 5 + 5 = 195 195 x 5 + 5 = 980 980 x 5 + 5 = 4905 4905 x 5 + 5 = 24530 24530 x 5 + 5 = 122655 So the missing number is 980 .
Q: Ratio between heights of two cylinder in the ratio 3:5. Their volumes are in the ratio 27:80. Find ratio between their radius ? 1583 05b5cc6c5e4d2b4197774dde1
5b5cc6c5e4d2b4197774dde1- 11:3false
- 22:1false
- 33:4true
- 44:7false
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Answer : 3. "3:4"
Explanation :
Answer: C) 3:4 Explanation:
Q: Who is the first richest person in India? 1582 05b5cc69ae4d2b4197774c787
5b5cc69ae4d2b4197774c787- 1Mukesh Ambanitrue
- 2Azim Premjifalse
- 3Dilip Shangvifalse
- 4Lakshmi Mittalfalse
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Answer : 1. "Mukesh Ambani"
Explanation :
Answer: A) Mukesh Ambani Explanation: According to 2018 January reports, Mukesh Ambani is the first richest person in India being 18th in the world, followed by Azim Premji and S.P. Hinduja in second and third places.
Q: K men agree to donate a gift of Rs. L to trust. If three men drop out how much more will each have to contribute towards the purchase of the gift ? 1582 05b5cc74fe4d2b4197774fb44
5b5cc74fe4d2b4197774fb44- 1L / (k-3)false
- 2k / (L-3)false
- 32K / 3L-Kfalse
- 43L / K(K-3)true
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Answer : 4. "3L / K(K-3)"
Explanation :
Answer: D) 3L / K(K-3) Explanation: Intial contribution = L/KAfter 3 men drop, then contribution =L/K-3The amount more to pay in contribution = LK-3 - LK = 3LK(K-3)
Q: Which of the following is a secondary air pollutant? 1581 05b5cc670e4d2b4197774c06a
5b5cc670e4d2b4197774c06a- 1Acid raintrue
- 2SO2false
- 3CO2false
- 4Dust particlesfalse
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Answer : 1. "Acid rain"
Explanation :
Answer: A) Acid rain Explanation: Secondary pollutants include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight. Whereas Primary pollutant are those pollutants that are directly emitted from their sources, like CO2, CO, SO2 as these gases are directly emitted form burning of fossil fuels. Acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water, sulfuric acid etc. Hence, Acidrain is a secondary air pollutant.