GATE Practice Question and Answer

Q: The ratio between present ages of Renuka and Sony is 5 : 4 . 4 years ago, Sony's age was 24 years. What will be Renuka's age after 5 years ? 1424 0

  • 1
    25
    Correct
    Wrong
  • 2
    30
    Correct
    Wrong
  • 3
    35
    Correct
    Wrong
  • 4
    40
    Correct
    Wrong
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Answer : 4. "40"
Explanation :

Answer: D) 40 Explanation: Present age of Sony = 24 + 4 = 28 years After 5 years Renuka's age = 7×5 + 5 = 40 years

Q: If rupee two produces rupees eleven over a period of 30 years, find the rate of simple interest ? 1422 0

  • 1
    17.25 %
    Correct
    Wrong
  • 2
    18.14 %
    Correct
    Wrong
  • 3
    18.33 %
    Correct
    Wrong
  • 4
    17.35 %
    Correct
    Wrong
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Answer : 3. "18.33 %"
Explanation :

Answer: C) 18.33 % Explanation: We know that I = PTR/100 11 = (2x30xR)/100 R = 18.333 %

Q: what is the source of energy for the water cycle? 1421 0

  • 1
    Rain water
    Correct
    Wrong
  • 2
    Sun
    Correct
    Wrong
  • 3
    Clouds
    Correct
    Wrong
  • 4
    Animals
    Correct
    Wrong
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Answer : 2. "Sun"
Explanation :

Answer: B) Sun Explanation: The water cycle is a term for the movement of water between the Earth's surface, the sky and underground. Water evaporates due to heat from the sun. Hence, the water cycle is driven primarily by the energy from the sun. This solar energy drives the cycle by evaporating water from the oceans, lakes, rivers, and even the soil. Other water moves from plants to the atmosphere through the process of transpiration.

Q: Which color has the highest frequency? 1421 0

  • 1
    Violet
    Correct
    Wrong
  • 2
    Red
    Correct
    Wrong
  • 3
    Indigo
    Correct
    Wrong
  • 4
    Green
    Correct
    Wrong
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Answer : 1. "Violet"
Explanation :

Answer: A) Violet Explanation: In VIBGYOR. It has colors ordered from highest to lowest frequency.                 Violet > Indigo > Blue > Green > Yellow > Orange > Red   That says Violet has the highest frequency. We know, Speed of light = Frequency x Wavelength => As frequeny is inversely proportional to wavelength i.e, as frequwncy goes high wavelength goes down.   So, the violet color has the highest frequency.

Q: Which phase change is an example of an exothermic process? 1421 0

  • 1
    Liquid to Solid
    Correct
    Wrong
  • 2
    Gas to Solid
    Correct
    Wrong
  • 3
    Gas to Liquid
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: Processes that require or give off heat will be limited to changes of state, known as phase changes, and changes in chemical constitution, or chemical reactions. Changes of state involve a solid melting, a liquid freezing, a liquid boiling or a gas condensing.   An exothermic process is one that gives off heat, which is transferred to the surroundings. An endothermic process is a reaction which heat has to be supplied to the system from the surroundings.   Here in all the given options, heat is taken away from them to change there phase.  Liquid to Solid --- Freezing Gas to Liquid --- Condensation Gas to Solid --- Deposition  are all examples of exothermic processes.

Q: A train running at the speed of 40 km/hr crosses a signal pole in 9 seconds. Find the length of the train ? 1421 0

  • 1
    90 mts
    Correct
    Wrong
  • 2
    150 mts
    Correct
    Wrong
  • 3
    120 mts
    Correct
    Wrong
  • 4
    100 mts
    Correct
    Wrong
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Answer : 4. "100 mts"
Explanation :

Answer: D) 100 mts Explanation: We know that   Speed=distancetime  distance= speed * time ⇒ d=40×518×9     d= 100 mts.

Q: 'Brothers and sisters, I have none. But that man's father is my father's son'.How I and that man are related respectively? 1420 0

  • 1
    Father & Son
    Correct
    Wrong
  • 2
    Brothers
    Correct
    Wrong
  • 3
    Son & Father
    Correct
    Wrong
  • 4
    Nephews
    Correct
    Wrong
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Answer : 1. "Father & Son"
Explanation :

Answer: A) Father & Son Explanation: Given that man's father is my father's son => Me because i have no brothers => Mans father is me. Hence, that man is my Son.

Q: LCD of 12 and 18 1420 0

  • 1
    36
    Correct
    Wrong
  • 2
    42
    Correct
    Wrong
  • 3
    12
    Correct
    Wrong
  • 4
    6
    Correct
    Wrong
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Answer : 1. "36"
Explanation :

Answer: A) 36 Explanation:   LCD is nothing but Lowest or Least Common Denominator   Here LCD of 12 and 18 means LCD of two fractions with denominators 12 and 18 respectively.   Therefore, LCM of 12 & 18 = 6 x 3 x 2 = 36     How to calculate LCD :: The lowest common denominator or least common denominator (LCD) is the least common multiple (LCM) of the denominators of a set of fractions.

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