GATE Practice Question and Answer

Q: Which of the following metal is generally used for making filaments of bulb? 2880 0

  • 1
    W
    Correct
    Wrong
  • 2
    Ag
    Correct
    Wrong
  • 3
    Fe
    Correct
    Wrong
  • 4
    Rh
    Correct
    Wrong
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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: The amount of water (in ml) that should be added to reduce 9 ml lotion, containing 50% alcohol, to a lotion containing 30% alcohol is ? 2872 0

  • 1
    6 ml
    Correct
    Wrong
  • 2
    11 ml
    Correct
    Wrong
  • 3
    15 ml
    Correct
    Wrong
  • 4
    9 ml
    Correct
    Wrong
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Answer : 1. "6 ml"
Explanation :

Answer: A) 6 ml Explanation: Let us assume that the lotion has 50% alcohol and 50% water.ratio = 1:1As the total solution is 9mlalcohol = water = 4.5mlNow if we want the quantity of alcohol = 30%The quantity of water = 70%The new ratio = 3:7Let x ml of water be addedWe get,4.54.5+x = 37=> x=6Hence 6ml of water is added.

Q: Find the next number in the given number series? 96, 95, 87, 78, ? 2865 0

  • 1
    64
    Correct
    Wrong
  • 2
    57
    Correct
    Wrong
  • 3
    29
    Correct
    Wrong
  • 4
    14
    Correct
    Wrong
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Answer : 4. "14"
Explanation :

Answer: D) 14 Explanation: The given number series is 96, 95, 87, 78, ?  It follows a pattern that, 9696 - 12 = 9595 - 23 = 95 - 8 = 8787 - 32 = 87 - 9 = 7878 - 43 = 78 - 64 = 14   Hence, the next number in the given number series is 14.

Q: What is the 13th letter of the English Alphabet? 2865 0

  • 1
    M & N
    Correct
    Wrong
  • 2
    M & M
    Correct
    Wrong
  • 3
    N & N
    Correct
    Wrong
  • 4
    N & L
    Correct
    Wrong
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Answer : 1. "M & N"
Explanation :

Answer: A) M & N Explanation: There are 26 English Alphabets. They are:   A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z.   Therefore, from the left end the 13th letter is M and is Consonent. And from the right end the 13th letter is N and is Consonent.

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 ? 2861 0

  • 1
    L
    Correct
    Wrong
  • 2
    K
    Correct
    Wrong
  • 3
    J
    Correct
    Wrong
  • 4
    I
    Correct
    Wrong
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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: 5 men and 3 boys can together cultivate a 23 acre field in 4 days and 3 men and 2 boys together can cultivate a 7 acre field in 2 days. How many boys will be needed together with 7 men, if they cultivate 45 acre of field in 6 days. 2854 0

  • 1
    6
    Correct
    Wrong
  • 2
    4
    Correct
    Wrong
  • 3
    2
    Correct
    Wrong
  • 4
    3
    Correct
    Wrong
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Answer : 3. "2"
Explanation :

Answer: C) 2 Explanation: Let work done by 1 man in i day be m and Let work done by 1 boy in 1 day be b From the given data, 4(5m + 3b) = 23 20m + 12b = 23....(1) 2(3m + 2b) = 7 6m + 4b = 7 ....(2) By solving (1) & (2), we get m = 1, b = 1/4 Let the number of required boys = n 6(7 1 + n x 1/4) = 45 => n = 2.

Q: The simple interest on Rs. 25 for 4 months at the rate of 3 paise per rupee per month is : 2851 0

  • 1
    240 paise
    Correct
    Wrong
  • 2
    Rs. 1.40
    Correct
    Wrong
  • 3
    Rs. 2.20
    Correct
    Wrong
  • 4
    Rs. 3
    Correct
    Wrong
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Answer : 4. "Rs. 3"
Explanation :

Answer: D) Rs. 3 Explanation: I = PTR/100I = 25 x 4 x 0.03/100I = 0.03 x 100 = 300 Ps = Rs. 3

Q: P alone can complete a piece of work in 6 days. Work done by Q alone in one day is equal to one-third of the work done by P alone in one day. In how many days can the work be completed if P and Q work together  ? 2850 0

  • 1
    5 (2/3)
    Correct
    Wrong
  • 2
    6 (3/4 )
    Correct
    Wrong
  • 3
    4 (1/2)
    Correct
    Wrong
  • 4
    3
    Correct
    Wrong
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Answer : 3. "4 (1/2)"
Explanation :

Answer: C) 4 (1/2) Explanation: Work done by P alone in one day = 1/6th of the total work done by Q alone in one day = 1/3(of that done by P in one day) = 1/3(1/6 of the total) = 1/18 of the total.    Work done by P and Q, working together in one day = 1/6 + 1/18  = 4/18 = 2/9    They would take 9/2 days = 4 (1/2) days to complete the work working together.

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