GATE Practice Question and Answer
8Q: Which of the following metal is generally used for making filaments of bulb? 3066 05b5cc6b9e4d2b4197774d6f3
5b5cc6b9e4d2b4197774d6f3- 1Wtrue
- 2Agfalse
- 3Fefalse
- 4Rhfalse
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Answer : 1. "W"
Explanation :
Answer: A) W Explanation: W is the symbol for chemical element Tungsten or Wolfram. It is used in making filaments of bulbs.
Q: A man can row against the current three fourth of a kilometer in 15 min and returns same distance in 10 min, then ratio of his speed to that of current? 3060 05b5cc6a8e4d2b4197774ce95
5b5cc6a8e4d2b4197774ce95- 15:1true
- 23:1false
- 34:1false
- 42:1false
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Answer : 1. "5:1"
Explanation :
Answer: A) 5:1 Explanation: Let the speed of the man in still water = p kmph Speed of the current = s kmph Now, according to the questions (p + s) x 10 = (p - s) x 15 2p + 2s = 3p - 3s => p : s = 5 : 1 Hence, ratio of his speed to that of current = 5:1.
Q: I. a2-7a+12 = 0, II. b2-3b+2 = 0 Solve both the equations to find the values of a and b ? 3057 05b5cc6e3e4d2b4197774eced
5b5cc6e3e4d2b4197774eced- 1if a > btrue
- 2if a < bfalse
- 3if the relationship between a and b cannot be established.false
- 4if a ≤ bfalse
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Answer : 1. "if a > b"
Explanation :
Answer: A) if a > b Explanation: I. (a - 3)(a - 4) = 0 => a = 3, 4 II. (b - 2)(b - 1) = 0 => b = 1, 2 => a > b
Q: One major cause of floods is 3057 05b5cc699e4d2b4197774c6d7
5b5cc699e4d2b4197774c6d7- 1light rain over a large areafalse
- 2a decrease in stream dischargefalse
- 3rapid spring snowmelttrue
- 4increased capacity of stream channelsfalse
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Answer : 3. "rapid spring snowmelt"
Explanation :
Answer: C) rapid spring snowmelt Explanation: There are lots of reasons behind the flood in any area but the main reason is a heavy downpour or rapid snowmelt can flood canyons with a mixture of soil, rock, and water is a major cause of floods. When the spring times come, sometimes there's a lot of warmth that suddenly comes, especially nowadays when there are things such as global warming. So the snow melts and large amounts of water can flood the fields that are often found at the foot of a mountain or similar things. But they may also be caused by deforestation, drainage channel modification from a landslide, earthquake or volcanic eruption. Examples include outburst floods and lahars.
Q: Sony is one-fifth the age of her mother 15 years ago and Sony’s brother is three-fifth the age of his mother 10 years ago. If the sum of Sony and her brother’s ages is 31 then how old is Sony's mother ? 3055 05b5cc745e4d2b4197774fa04
5b5cc745e4d2b4197774fa04- 140false
- 250true
- 360false
- 470false
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Answer : 2. "50"
Explanation :
Answer: B) 50 Explanation: Sony and her brother's age sum is 31Let Sony's mother's age be 'x'.Now the conditions given for both of their ages related to their mom is1/5(x-15) + 3/5(x-10) = 31x-15 + 3x-30 = 1554x-45 = 1554x = 200x = 50So, Mother's age = 50. Cross verification : 15 years ago age = 35 => Sony age = 710 years ago age = 40 => bro age = 24 Sum = 24 + 7 = 31.
Q: If M $ N means M is the brother of N; M # N means M is the mother of N; M * N means M is the daughter of N. Then in I # J $ K * L, who is the father ? 3055 05b5cc6d5e4d2b4197774e61a
5b5cc6d5e4d2b4197774e61a- 1Ltrue
- 2Kfalse
- 3Jfalse
- 4Ifalse
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Answer : 1. "L"
Explanation :
Answer: A) L Explanation: I is the mother of J, J is the brother of K and K is the daughter of L. Hence , L is the Father.
Q: What is better, to have 70% discount or 40 and 30% discount consequently ? 3042 05b5cc70ee4d2b4197774f38f
5b5cc70ee4d2b4197774f38f- 140% is betterfalse
- 270% is bettertrue
- 3Both are samefalse
- 4Nonefalse
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Answer : 2. "70% is better"
Explanation :
Answer: B) 70% is better Explanation: Let Price be Rs.100 1st CASE: Then 100 x 70/100 = 70=> price after discount = 100-70 = Rs.30 2nd CASE: Then 100 x 40/100 = 40=> price after discount = 100-40 = Rs.60then60 x 30/100 = 18=> price after 2 consequent discount = 60-18 = Rs.42 =>from 1 and 2 cases, 70% discount is better.
Q: A man pointing to a lady says, "Her brother is the father of my only son's sister." How is that lady related to the man ? 3041 05b5cc715e4d2b4197774f45e
5b5cc715e4d2b4197774f45e- 1sister of father-in-lawfalse
- 2daughter-in-lawfalse
- 3Sistertrue
- 4daughterfalse
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Answer : 3. "Sister"
Explanation :
Answer: C) Sister Explanation: