GATE Practice Question and Answer

Q: Is water a Pure substance? 919 0

  • 1
    TRUE
    Correct
    Wrong
  • 2
    FALSE Answer & Explanation Answer:
    Correct
    Wrong
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Answer : 1. "TRUE"
Explanation :

Answer: A) TRUE Explanation: True, Water is a Pure substance and not a mixture.   We know that, A mixture is when two or more substances combine physically together. You can find that the mixture retains the properties of the original components. In water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone.   Therefore, water is not a mixture; it is a compound and it is pure.

Q: 19 friends went to a restaurant for a combined weekend dinner party. 13 of them spent Rs. 79 each on their dinner and the rest spent Rs. 4 more than the average expenditure of all the 19. What was the total money spent by them? 917 0

  • 1
    Rs. 1398.96
    Correct
    Wrong
  • 2
    Rs. 1457.09
    Correct
    Wrong
  • 3
    Rs. 1662.35
    Correct
    Wrong
  • 4
    Rs. 1536.07
    Correct
    Wrong
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Answer : 4. "Rs. 1536.07"
Explanation :

Answer: D) Rs. 1536.07 Explanation: Let average expenditure was Rs. R 13 x 79 + 6x(R + 4) = 19R => R = Rs. 80.84 Total money = 19 x 80.84 = Rs. 1536.07.

Q: Find at what time between 9 and 10 o’clock will the hands of a clock be in 180° ? 915 0

  • 1
    180/14 min past 10
    Correct
    Wrong
  • 2
    180/11 min past 9
    Correct
    Wrong
  • 3
    148/7 min past 10
    Correct
    Wrong
  • 4
    154/11 min past 9
    Correct
    Wrong
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Answer : 2. "180/11 min past 9"
Explanation :

Answer: B) 180/11 min past 9 Explanation: At 9 o’clock, the hour hand is at 9 and the minutes hand is at 12, i.e., the two hands are 15 min. spaces apart.So, the minute hand should gain = (30 - 15) minutes = 15 minutes55 minutes will be gained in 60 min.15 minutes spaces will be gained in ((60/55) x 15) min. = 180/11 min.The hands will be in the same straight line but not together i.e.,in 180 degrees at 180/11 min. past 9.

Q: There are 3 sections with 5 questions each. If four questions are selected from each section, the chance of getting different questions is ? 912 0

  • 1
    1000
    Correct
    Wrong
  • 2
    625
    Correct
    Wrong
  • 3
    525
    Correct
    Wrong
  • 4
    125
    Correct
    Wrong
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Answer : 4. "125"
Explanation :

Answer: D) 125 Explanation: Methods for selecting 4 questions out of 5 in the first section = 5 x 4 x 3 x 2 x 1/4 x 3 x 2 x 1 = 5. Similarly for other 2 sections also i.e 5 and 5 So total methods = 5 x 5 x 5 = 125.

Q: Find the length of a train if it takes 10 seconds to cross a pole and double of this time to cross a platform of length 200 mts ? 892 0

  • 1
    180 mts
    Correct
    Wrong
  • 2
    190 mts
    Correct
    Wrong
  • 3
    200 mts
    Correct
    Wrong
  • 4
    210 mts
    Correct
    Wrong
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Answer : 3. "200 mts"
Explanation :

Answer: C) 200 mts Explanation: Let the length of the train be 'L' mts let the speed of the train be 'S' m/s Given it crosses a pole in 10 sec=> L/S = 10 ......(1)Given it takes 20 sec (double of pole) to cross a platform of length 200 mts => (L + 200)/S = 20 => L/S + 200/S = 20 But from (1) L/S = 10 => 200/S = 20 - 10 => S = 20 m/s Then, from (1) => L = 10 x 20 = 200 mts. Hence, the length of the train = 200 mts.

Q: 40% of 80? 882 0

  • 1
    36
    Correct
    Wrong
  • 2
    32
    Correct
    Wrong
  • 3
    42
    Correct
    Wrong
  • 4
    44
    Correct
    Wrong
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Answer : 2. "32"
Explanation :

Answer: B) 32 Explanation: Here 40% of 80 is given as 40100 x 80 = 8 x 4 = 32

Q: How do you make the number one disappear? 873 0

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Answer :
Explanation :

Add the letter 'G' to the word 'ONE' and it become's 'Gone' which means disappear.

Q: I have three eyes but only one leg. I still close one even if you beg.  What am I? 870 0

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Answer :
Explanation :

A traffic light. It has three 'eyes' (the red, orange and green lights) and the leg is the pole holding it up. Many people beg the light to stay green as they’re approaching.

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