GATE Practice Question and Answer

Q: A tin a mixture of two liquids A and B in the proportion 4 : 1. If 45 litres of the mixture is replaced by 45 litres of liquid B, then the ratio of the two liquids becomes 2 : 5. How much of the liquid B was there in the tin? What quantity does the tin hold? 1909 0

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    58 l
    Correct
    Wrong
  • 2
    65 l
    Correct
    Wrong
  • 3
    50 l
    Correct
    Wrong
  • 4
    62 l
    Correct
    Wrong
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Answer : 3. "50 l"
Explanation :

Answer: C) 50 l Explanation: Let the tin contain 5x litres of liquids 5x - 45 x 455x - 45 x 15 + 45 = 25 => 5(4x - 36) = 2(x + 36) => 20x - 180 = 2x + 72 => x = 14 litres Hence, the initial quantity of mixture = 70l Quantity of liquid B = 70 - 45 x 15 + 45  = 50 litres.

Q: Bacteria divide by 1578 0

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    Binary Fission
    Correct
    Wrong
  • 2
    Spirilla
    Correct
    Wrong
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    RNA
    Correct
    Wrong
  • 4
    Fusion
    Correct
    Wrong
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Answer : 1. "Binary Fission"
Explanation :

Answer: A) Binary Fission Explanation: Bacteria divided and reproduce by Binary fission. In this process, the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two replicates.

Q: What is the value of a two–digit number? A. The sum of the digits is 15. B. The difference of the squares of the digits is 45. C. The difference of their digits is 3. 1450 0

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    B and C together are sufficient
    Correct
    Wrong
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    Any one pair of A and B, B and C or C and A is sufficient
    Correct
    Wrong
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    C and A together are sufficient
    Correct
    Wrong
  • 4
    A and B together are sufficient
    Correct
    Wrong
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Answer : 2. "Any one pair of A and B, B and C or C and A is sufficient"
Explanation :

Answer: B) Any one pair of A and B, B and C or C and A is sufficient Explanation: From the given data, Let the two gits of a number be x & y A) x + y = 15   B) x2 - y2 = 45 (x+y) (x - y) = 45   C) x - y = 3 From any 2 of the given 3 statements, we can find that 2 digit number as  2x = 18 => x = 9 => y = 6 Hence, 2 digit number is 96.   Any one pair of A and B, B and C or C and A is sufficient to find.

Q: Sandeep got Rs. 6000 as his share out of the total profit of Rs. 9000 which he and Saketh earned at the end of one year. If Sandeep invested Rs. 20000 for 6 months, whereas Saketh invested his amount for the whole year, the amount invested by Saketh? 1788 0

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    Rs. 5000
    Correct
    Wrong
  • 2
    Rs. 6200
    Correct
    Wrong
  • 3
    Rs. 8100
    Correct
    Wrong
  • 4
    R. 7600
    Correct
    Wrong
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Answer : 1. "Rs. 5000"
Explanation :

Answer: A) Rs. 5000 Explanation: Let the amount invested by saketh = RS. p Now, that of sandeep = 20,000 x 6 saketh = 12 x p Ratio of their earnings = 120000 : 12p = 6000 : (9000 - 6000) => 12000012p = 60003000 => p= Rs. 5000 Hence, the amount investe by saketh  = Rs. p  = Rs. 5000.

Q: The amount of water vapor in the air is 1587 0

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    Hot air
    Correct
    Wrong
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    Humidity
    Correct
    Wrong
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    Dew
    Correct
    Wrong
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    Foam
    Correct
    Wrong
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Answer : 2. "Humidity"
Explanation :

Answer: B) Humidity Explanation: The amount of water vapor ranges from a trace amount up to 4% of the mass of air. Water vapor exists as an invisible gas in the air.   The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity. The maximum amount of water vapor that can be in the air depends on the air temperature.

Q: Antonym of:: Amicable 1422 0

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    Hostile
    Correct
    Wrong
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    Loveable
    Correct
    Wrong
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    Friendly
    Correct
    Wrong
  • 4
    Peaceful
    Correct
    Wrong
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Answer : 1. "Hostile"
Explanation :

Answer: A) Hostile Explanation: Amicable means Friendly or in Loveable, peaceful sense. Then Antonyms for Amicable are Opposite of Friendly => Unfriendly, Hostile, Unpeaceful, etc...

Q: Is DRAM Volatile or Nonvolatile? 1625 0

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Answer :
Explanation :

DRAM is a Volatile random-access memory (VRAM).   Volatile random-access memory (VRAM) is random-access memory that retains its information when power is turned on. Examples of volatile memory are primary storage (typically dynamic RAM, DRAM), and fast CPU cache memory (typically static RAM, SRAM, which is fast but energy-consuming and offer lower memory capacity per area unit than DRAM). Non-volatile random-access memory (NVRAM) is random-access memory that retains its information when power is turned off. Examples of non-volatile memory are flash memory (used as secondary memory) and ROM, PROM, EPROM and EEPROM memory (used for storing firmware such as BIOS).

Q: A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of 1420 0

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    18 m/s
    Correct
    Wrong
  • 2
    25 m/s
    Correct
    Wrong
  • 3
    30 m/s
    Correct
    Wrong
  • 4
    36 m/s
    Correct
    Wrong
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Answer : 3. "30 m/s"
Explanation :

Answer: C) 30 m/s Explanation: The interval between object pass the same point is 4 sec. That means in 2 sec, object reaches the top and in next 2 sec, it again reaches the same point. By the info given, we can find the velocity of that point by using : v=u+(-gt) 0= u - 10×2 u = 20 Then the velocity at 25m is 20m/sec. so the initial velocity is -v2 = u2 + (-2gh)400 = u2 - 2x 10 x 25u2 = 900 => u = 30 m/s

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