GRE Practice Question and Answer

Q: What always works with something in its eye? 1335 0

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Answer :
Explanation :

A Needle works when it has thread in its eye that is in its tiny hole.

Q: What causes brownian motion in colloids? 1334 0

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    coagulation of particles and the dispersed phase
    Correct
    Wrong
  • 2
    erratic flashes of light
    Correct
    Wrong
  • 3
    molecules of the dispersion medium colliding with dispersed phase particles
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 3. "molecules of the dispersion medium colliding with dispersed phase particles"
Explanation :

Answer: C) molecules of the dispersion medium colliding with dispersed phase particles Explanation: When their is a colloid in the solution, then it will show the Brownian movement, such as dust particle in the air will show the Brownian movement.   Hence, Brownian movement arises due to the impact of the molecules of the dispersion medium with the colloidal particles. It has been postulated that the impact of the molecules of dispersion medium on the colloidal particles are unequal.   This leads to the zig-zag (random) motion of the colloidal particles.

Q: Which is the largest coal producing country in the World? 1332 0

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    India
    Correct
    Wrong
  • 2
    China
    Correct
    Wrong
  • 3
    Russia
    Correct
    Wrong
  • 4
    New-zealand
    Correct
    Wrong
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Answer : 2. "China"
Explanation :

Answer: B) China Explanation: China has been by far the biggest coal producing country over the last three decades. The country produced about 3.6 billion tonnes (Bt) of coal in 2012 accounting for over 47% of the world's total coal output.

Q: Sweety is 54 years old and her mother is 80. How many years ago was Sweety's mother three times her age? 1330 0

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    20
    Correct
    Wrong
  • 2
    41
    Correct
    Wrong
  • 3
    26
    Correct
    Wrong
  • 4
    33
    Correct
    Wrong
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Answer : 2. "41"
Explanation :

Answer: B) 41 Explanation: Given P = 54 and M = 80 According to the question, Let ‘A’ years ago, M = 3P => M - A/P - A = 3 => 80 - A = 3(54 - A) => 80 - A = 162 - 3A => 2A = 82 => A = 41 Therefore, A = 41 years ago Sweety’s mother was 3 times of Sweety’s age. Hence, at the age S = 13 and M = 39.

Q: In a mixture of milk and water the proportion of water by weight was 75%. If in 60 gm of mixture 15 gm water was added, what would be the percentage of water ? (Weight in gm) 1326 0

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    80%
    Correct
    Wrong
  • 2
    70%
    Correct
    Wrong
  • 3
    75%
    Correct
    Wrong
  • 4
    62%
    Correct
    Wrong
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Answer : 1. "80%"
Explanation :

Answer: A) 80% Explanation: Water in 60 gm mixture=60 x 75/100 = 45 gm. and Milk = 15 gm.   After adding 15 gm. of water in mixture, total water = 45 + 15 = 60 gm and weight of a mixture = 60 + 15 = 75 gm.   So % of water = 100 x 60/75 = 80%.

Q: The sum of one-half, one-third and one-fourth of a number exceeds the number by 22. The number is 1324 0

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    264
    Correct
    Wrong
  • 2
    284
    Correct
    Wrong
  • 3
    215
    Correct
    Wrong
  • 4
    302
    Correct
    Wrong
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Answer : 1. "264"
Explanation :

Answer: A) 264 Explanation: Let the number be 'x'. Then, from given data x/2 + x/3 + x/4 = x+2213x/12 = x+22x = 264

Q: Which one of the following foreign agencies will assist the municipal agencies to improve quality of municipal schools through its School Excellence Programmes(SEP) ? 1322 0

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    IMF
    Correct
    Wrong
  • 2
    UNDP
    Correct
    Wrong
  • 3
    ADB
    Correct
    Wrong
  • 4
    UNICEF
    Correct
    Wrong
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Answer : 3. "ADB"
Explanation :

Answer: C) ADB Explanation: Asian Development Bank (ADB) announced that it will assist the municipal agencies to improve quality of municipal schools through its School Excellence Programme (SEP).

Q: What has 3 feet but cannot walk? 1321 0

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Answer :
Explanation :

We know that 1 yard = 3 feet.    A yardstick which is used for measurement has 3 feet long but it cannot walk.

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