GATE Practice Question and Answer

Q: Which of these relationships is true of an uncharged atom? 5337 0

  • 1
    The atomic mass is equal to the atomic number.
    Correct
    Wrong
  • 2
    The number of electrons is equal to the number of neutrons.
    Correct
    Wrong
  • 3
    The number of protons is equal to the number of electrons.
    Correct
    Wrong
  • 4
    The atomic mass is equal to the number of electrons.
    Correct
    Wrong
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Answer : 3. "The number of protons is equal to the number of electrons."
Explanation :

Answer: C) The number of protons is equal to the number of electrons. Explanation: The number of protons is equal to the number of electrons. That is the number of positive charges is equal to the number of negative charges.

Q: Lichens are the best indicator of 5289 1

  • 1
    Air pollution
    Correct
    Wrong
  • 2
    Sound pollution
    Correct
    Wrong
  • 3
    Noise pollution
    Correct
    Wrong
  • 4
    Water pollution
    Correct
    Wrong
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Answer : 1. "Air pollution"
Explanation :

Answer: A) Air pollution Explanation: 1. Lichens are plants that grow in exposed places such as rocks or tree bark.   2.  Lichens are widely used as environmental indicators or bio-indicators. They can be used as air pollution indicators, especially of the concentration of sulfur-di-oxide in the atmosphere.     3. They need to be very good at absorbing water and nutrients to grow there.

Q: Pen is to poet as needle is to 5281 0

  • 1
    Sewing
    Correct
    Wrong
  • 2
    Thread
    Correct
    Wrong
  • 3
    Tailor
    Correct
    Wrong
  • 4
    Button
    Correct
    Wrong
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Answer : 3. "Tailor"
Explanation :

Answer: C) Tailor Explanation: Here Pen is a tool which is used to write and poet uses it. Then, the needle is a tool which is used to stitch and it is used by Tailor. Except tailor, none of the other options is a person to use it.   Hence, Pen : Poet :: Needle : Tailor

Q: Two persons start running simultaneously around a circular track of length 300 m from the same point at speeds of 15 km/hr and 25 km/hr. When will they meet for the first time any where on the track if they are moving in opposite directions  ? 5259 0

  • 1
    27 sec
    Correct
    Wrong
  • 2
    31 sec
    Correct
    Wrong
  • 3
    23 sec
    Correct
    Wrong
  • 4
    29 sec
    Correct
    Wrong
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Answer : 1. "27 sec"
Explanation :

Answer: A) 27 sec Explanation: Time taken to meet for the first time anywhere on the track = length of the track / relative speed = 300 / (15 + 25)5/18 = 300x 18 / 40 x 5 = 27 seconds.

Q: The average weight of 45 passengers in a bus is 52 kg. 5 of them whose average weight is 48 kg leave the bus and other 5 passengers whose average weight is 54 kg join the bus at the same stop. What is the new average weight of the bus? 5249 0

  • 1
    54.21 kgs
    Correct
    Wrong
  • 2
    51.07 kgs
    Correct
    Wrong
  • 3
    52.66 kgs
    Correct
    Wrong
  • 4
    53.45 kgs
    Correct
    Wrong
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Answer : 3. "52.66 kgs"
Explanation :

Answer: C) 52.66 kgs Explanation: Given total number of passengers in the bus = 45 First average weight of 45 passengers = 52 kgs Average weight of 5 passengers who leave bus = 48 Average weight of 5 passengers who joined the bus = 54 Therefore, the net average weight of the bus is given by = 45 x 52 - 5 x 48 + 5 x 5445 = 237045= 1583= 52.66 kgs.

Q: One-quarter of one-seventh of a land is sold for Rs. 30,000. What is the value of an four fifteenth of land ? 5227 0

  • 1
    Rs.1,92,000
    Correct
    Wrong
  • 2
    Rs.2,24,000
    Correct
    Wrong
  • 3
    Rs.1,26,000
    Correct
    Wrong
  • 4
    Rs.3,42,000
    Correct
    Wrong
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Answer : 2. "Rs.2,24,000"
Explanation :

Answer: B) Rs.2,24,000 Explanation: One-quarter of one-seventh = 1/4 x 1/7= 1/28Now, 1/28 of a land costs = Rs. 30,000Thus, 8/35 of the land will cost = 30,000 x 28 x 4/15= Rs. 2,24,000.

Q: Hari Ram’s present age is three times his son’s present age and two fifth of his father’s present age. The average of the present age of all of them is 46 years. What is the difference between Hari Ram’s son’s present age and Hari Ram’s father’s present age? 5226 0

  • 1
    44 yrs
    Correct
    Wrong
  • 2
    56 yrs
    Correct
    Wrong
  • 3
    67 yrs
    Correct
    Wrong
  • 4
    78 yrs
    Correct
    Wrong
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Answer : 4. "78 yrs"
Explanation :

Answer: D) 78 yrs Explanation: Let Hari Ram's present age = x Then, his son's age = x/3 Father's age = 5x/2 x + x3 + 52x3 = 46=> x = 36 yrs Now the required difference = 52x36 - 363 = 78 yrs

Q: Find the odd man out of the number series? 18, 37, 76, 155, 314, 635 5221 0

  • 1
    37
    Correct
    Wrong
  • 2
    155
    Correct
    Wrong
  • 3
    314
    Correct
    Wrong
  • 4
    635
    Correct
    Wrong
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Answer : 4. "635"
Explanation :

Answer: D) 635 Explanation: Given Number series is 18     37     76     155     314     635   follows a pattern that,    18   18 x 2 +1 = 37   37 x 2 +2 = 76   76 x 2 +3 = 155   155 x 2 +4 = 314   314 x 2 +5 = 633 not 635       Hence, the odd man is 635.

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