GATE Practice Question and Answer

Q: What percent is 120 of 85 ? 1789 0

  • 1
    133.33 %
    Correct
    Wrong
  • 2
    141.17 %
    Correct
    Wrong
  • 3
    145.54 %
    Correct
    Wrong
  • 4
    139.29 %
    Correct
    Wrong
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Answer : 2. "141.17 %"
Explanation :

Answer: B) 141.17 % Explanation: Px85100=120   => p = 12000/85 = 141.17 %

Q: Which technology is used in compact disks? 1789 1

  • 1
    Laser
    Correct
    Wrong
  • 2
    Mechanical
    Correct
    Wrong
  • 3
    Electrical
    Correct
    Wrong
  • 4
    Electro magnetic
    Correct
    Wrong
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Answer : 1. "Laser"
Explanation :

Answer: A) Laser Explanation: Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982.  These are actually made to replace floppy disks that were used to store files and programs from the computer.   The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD-ROM).   These CD's uses Laser technology.

Q: Arrange the following words in an appropriate order 1. Rainbow   2. Rain   3. Sun    4. Happy    5. Child 1789 0

  • 1
    4, 2, 3, 5, 1
    Correct
    Wrong
  • 2
    4, 5, 1, 2, 3
    Correct
    Wrong
  • 3
    2, 1, 4, 5, 3
    Correct
    Wrong
  • 4
    2, 3, 1, 5, 4
    Correct
    Wrong
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Answer : 4. "2, 3, 1, 5, 4"
Explanation :

Answer: D) 2, 3, 1, 5, 4 Explanation: Firstly Rain falls and then Sun comes and Rainbow forms. After that Child sees the rainbow and feels Happy.

Q: Find the wrong number in the given series :26, 20, 16, 11, 8, 6, 5 1788 0

  • 1
    5
    Correct
    Wrong
  • 2
    26
    Correct
    Wrong
  • 3
    11
    Correct
    Wrong
  • 4
    16
    Correct
    Wrong
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Answer : 4. "16"
Explanation :

Answer: D) 16 Explanation: 26 - 6 = 20 20 - 5 = 15 15 - 4 = 11 11 - 3 = 8 8 - 2 = 6 6 - 1 = 5 Therefore, 16 is wrong number.

Q: Rajitha invested 25% more than Santhosh. Santhosh invested 30% less than Raju, who invested Rs. 6,000. What is the ratio of the amount that Rajitha invested to the total amount invested by all of them together ? 1787 0

  • 1
    25 : 114
    Correct
    Wrong
  • 2
    35 : 103
    Correct
    Wrong
  • 3
    15 : 108
    Correct
    Wrong
  • 4
    41 : 94
    Correct
    Wrong
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Answer : 2. "35 : 103"
Explanation :

Answer: B) 35 : 103 Explanation: Santhosh's investment = 6000 x 70/100 = Rs.4200Rajitha's investment = 4200 x 5/4 = Rs.5250Therefore, total amount invested = 6000 + 4200 + 5250 = Rs.15450.Required ratio = 5250 : 15450 = 35 : 103.

Q: Karthik could cover a distance of 200 km in 22 days while resting for 2 hrs. per day. In how many days (approx) he will cover a distance of 250 km while resting for 2 hrs. per day and moving with 2/3rd of the previous speed ? 1786 0

  • 1
    41.25 days
    Correct
    Wrong
  • 2
    37.5 days
    Correct
    Wrong
  • 3
    39.75 days
    Correct
    Wrong
  • 4
    40 days
    Correct
    Wrong
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Answer : 1. "41.25 days"
Explanation :

Answer: A) 41.25 days Explanation: Given Karthik can cover the distance of 200 kms resting 2 hrs per day in 22 days.   Let the initial speed be '1'   Hence, Time = 22(24hrs - 2)   Noe new speed = 2/3   Let the number of days he take be 'D'   Therefore, 2224-2x3200=D24-2x2250   D = 11 x 3 x 5/4 = 41.25 days. = 41 1/4 days.

Q: If 1/a+1/b+1/c = 1/(a+b+c) where a+b+c not equals '0', abc not equals '0', What is the value of (a+b) (b+c) (a+c) ? 1785 0

  • 1
    3
    Correct
    Wrong
  • 2
    2
    Correct
    Wrong
  • 3
    1
    Correct
    Wrong
  • 4
    0
    Correct
    Wrong
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Answer : 4. "0"
Explanation :

Answer: D) 0 Explanation: Let assume the value of a,b &c that will satisfy the equation.so a=1,b=1,c= -1 or a=1,b= -1 &c=1 or a= -1,b=1,c=1here all three cases satisfy the equationassume any one a=1,b=1,c= -1 Hence (a+b)(b+c)(c+a)=(1+1)(1-1)(-1+1) = 0

Q: A bag contains 3 red balls, 5 yellow balls and 7 pink balls. If one ball is drawn at random from the bag, what is the probability that it is either pink or red? 1785 0

  • 1
    2/3
    Correct
    Wrong
  • 2
    1/8
    Correct
    Wrong
  • 3
    3/8
    Correct
    Wrong
  • 4
    3/4
    Correct
    Wrong
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Answer : 1. "2/3"
Explanation :

Answer: A) 2/3 Explanation: Given number of balls = 3 + 5 + 7 = 15 One ball is drawn randomly = 15C1 probability that it is either pink or red = 7C1 + 3C115C1 = 7 + 315 = 1015 = 23

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