GATE Practice Question and Answer

Q: In how many different ways can the letters of the word 'THERAPY' be arranged so that the vowels never come together? 1681 0

  • 1
    1440
    Correct
    Wrong
  • 2
    720
    Correct
    Wrong
  • 3
    2250
    Correct
    Wrong
  • 4
    3600
    Correct
    Wrong
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Answer : 4. "3600"
Explanation :

Answer: D) 3600 Explanation: Given word is THERAPY. Number of letters in the given word = 7 These 7 letters can be arranged in 7! ways. Number of vowels in the given word = 2 (E, A) The number of ways of arrangement in which vowels come together is 6! x 2! ways   Hence, the required number of ways can the letters of the word 'THERAPY' be arranged so that the vowels never come together = 7! - (6! x 2!) ways = 5040 - 1440 = 3600 ways.

Q: Third proportion of 10 and 20 is 1681 0

  • 1
    30
    Correct
    Wrong
  • 2
    40
    Correct
    Wrong
  • 3
    25
    Correct
    Wrong
  • 4
    20
    Correct
    Wrong
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Answer : 2. "40"
Explanation :

Answer: B) 40 Explanation: The third proportional of two numbers p and q is defined to be that number r such that p : q = q : r.   Here, required third proportional of 10 & 20, and let it be 'a' => 10 : 20 = 20 : a 10a = 20 x 20 => a = 40   Hence, third proportional of 10 & 20 is 40.

Q: What number should be Replaced ? 1678 0

  • 1
    15
    Correct
    Wrong
  • 2
    17
    Correct
    Wrong
  • 3
    10
    Correct
    Wrong
  • 4
    6
    Correct
    Wrong
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Answer : 4. "6"
Explanation :

Answer: D) 6 Explanation: Sum of numbers in the outer circle in before Arc should come in inner circle patterns in the clock wise direction next Arc. i.e, 9+6 = 15 comes in next arc of inner circle 7+3 = 10 comes in next arc of inner circle In the same way, 4+2 = 6 comes in place of '?'.

Q: In a box, there are four marbles of white color and five marbles of black color. Two marbles are chosen randomly. What is the probability that both are of the same color? 1677 0

  • 1
    2/9
    Correct
    Wrong
  • 2
    5/9
    Correct
    Wrong
  • 3
    4/9
    Correct
    Wrong
  • 4
    0
    Correct
    Wrong
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Answer : 3. "4/9"
Explanation :

Answer: C) 4/9 Explanation: Number of white marbles = 4 Number of Black marbles = 5 Total number of marbles = 9 Number of ways, two marbles picked randomly = 9C2 Now, the required probability of picked marbles are to be of same color = 4C2/9C2  +  5C2/9C2 = 1/6 + 5/18 = 4/9.

Q: If a barometric reading is falling, this usually indicates what 1677 0

  • 1
    Increasing pressure
    Correct
    Wrong
  • 2
    Decreasing pressure
    Correct
    Wrong
  • 3
    No pressure
    Correct
    Wrong
  • 4
    None
    Correct
    Wrong
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Answer : 2. "Decreasing pressure"
Explanation :

Answer: B) Decreasing pressure Explanation: A barometer is a tool that measures air pressure A rising barometer indicates increasing air pressure, a falling barometer indicates decreasing air pressure. In space, there is a nearly complete vacuum, so the air pressure is zero.

Q: The area of a square is 1024 sq.cm. What is the ratio of the length to the breadth of a rectangle whose length is twice the side of the square and breadth is 12 cm less than the side of this square ? 1676 0

  • 1
    14:9
    Correct
    Wrong
  • 2
    13:12
    Correct
    Wrong
  • 3
    16:5
    Correct
    Wrong
  • 4
    17:13
    Correct
    Wrong
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Answer : 3. "16:5"
Explanation :

Answer: C) 16:5 Explanation: Area of a square SxS = 1024 => S = 32 cmLength of the rectangle = 32x2 cm = 64 cmBreadth of the rectangle = 32 - 12 = 20 cmRequired ratio = 64 : 20 = 16 : 5

Q: Which of the following is a compound sentence? 1675 0

  • 1
    We can go see a movie, or we can get something to eat.
    Correct
    Wrong
  • 2
    When you get there, please remember to call me.
    Correct
    Wrong
  • 3
    Mohan bought some new shoes and wore them to a party.
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
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Answer : 1. "We can go see a movie, or we can get something to eat."
Explanation :

Answer: A) We can go see a movie, or we can get something to eat. Explanation: A compound sentence is a sentence that has at least two independent clauses joined by a comma, semicolon or conjunction. An independent clause is a clause that has a subject and verb and forms a complete thought. Here except option A) other two options dependent.   Hence, A) We can go see a movie, or we can get something to eat is a compound sentence.

Q: Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5 ? 1675 0

  • 1
    2/3
    Correct
    Wrong
  • 2
    1/2
    Correct
    Wrong
  • 3
    7/8
    Correct
    Wrong
  • 4
    4/5
    Correct
    Wrong
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Answer : 2. "1/2"
Explanation :

Answer: B) 1/2 Explanation: Multiples of 3 below 20 are 3, 6, 9, 12, 15, 18 Multiples of 5 below 20 are 5, 10, 15, 20 Required number of possibilities = 10Total number of possibilities = 20Required probability = 10/20 = 1/2.

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