IIT JEE Practice Question and Answer

Q: A F Z U G L T _  Find the next letter in the above given letter series? 2618 0

  • 1
    K
    Correct
    Wrong
  • 2
    M
    Correct
    Wrong
  • 3
    O
    Correct
    Wrong
  • 4
    Q
    Correct
    Wrong
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Answer : 3. "O"
Explanation :

Answer: C) O Explanation: Given series is A F Z U G L T _ Starts with A A + 5 letters = F go to end of alphabet= Z Z - 5 letters = U from F go one more to G + 5 letters = L from U go one back to U, T - 5 letters = O   Second Method :: Change the letters to their corresponding number. A=1 B=2 C=3 ... Z=26 A F Z U G L T _ 1 6 26 21 7 12 20 ? Look at the pattern: the 1st and 3rd numbers = 27, 1+26 the 2nd and 4th numbers = 27, 6+21 the 5th and 7th numbers = 27, so the 6 and 8th would also equal 27. 27 - 12 = 15, so the letter is O.

Q: A man could buy a certain number of notebooks for Rs.300. If each notebook cost is Rs.5 more, he could have bought 10 notebooks less for the same amount. Find the price of each notebook ? 2616 0

  • 1
    15
    Correct
    Wrong
  • 2
    20
    Correct
    Wrong
  • 3
    10
    Correct
    Wrong
  • 4
    8
    Correct
    Wrong
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Answer : 3. "10"
Explanation :

Answer: C) 10 Explanation: Let the price of each note book be Rs.x. Let the number of note books which can be brought for Rs.300 each at a price of Rs.x be y. Hence xy = 300 => y = 300/x (x + 5)(y - 10) = 300 => xy + 5y - 10x - 50 = xy =>5(300/x) - 10x - 50 = 0 => -150+x2+5x multiplying both sides by -1/10x => x2+15x-10x-150=0 => x(x + 15) - 10(x + 15) = 0 => x = 10 or -15 As x>0, x = 10.

Q: Which of the following is not an aerosol? 2615 0

  • 1
    mud
    Correct
    Wrong
  • 2
    dust
    Correct
    Wrong
  • 3
    smoke
    Correct
    Wrong
  • 4
    fog
    Correct
    Wrong
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Answer : 1. "mud"
Explanation :

Answer: A) mud Explanation: Among the given options, mud is not an aerosol.   An aerosol is a suspension of fine solid particles or liquid droplets, in the air or another gas. Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, dust, forest exudates and geyser steam. Examples of anthropogenic aerosols are haze, particulate air pollutants, and smoke.

Q: A train for Fathehpur leaves for every 2 hrs 30 min from Agra station. An announcement was made that train left 37 mins ago and next train comes at 17:00hrs. At what time was the announcement made ? 2614 0

  • 1
    15:07 hrs
    Correct
    Wrong
  • 2
    15:20 hrs
    Correct
    Wrong
  • 3
    15:05 hrs
    Correct
    Wrong
  • 4
    15:00 hrs
    Correct
    Wrong
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Answer : 1. "15:07 hrs"
Explanation :

Answer: A) 15:07 hrs Explanation: Next train comes at 17:00 hrs.So, last train will be = 17:00hrs - 2:30hrs= 14:30hrsAnnouncement made after 37 min of the last train.S0, 14:30hrs + 00:37 min= 15:07 hrs.

Q: Find the odd one out? 6, 3, 3, 4.5, 10 2612 0

  • 1
    3
    Correct
    Wrong
  • 2
    4.5
    Correct
    Wrong
  • 3
    6
    Correct
    Wrong
  • 4
    10
    Correct
    Wrong
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Answer : 4. "10"
Explanation :

Answer: D) 10 Explanation: Here the given number series is 6, 3, 3, 4.5, 10 The odd one in the given series is 10 The pattern it follows is 6 6 x 0.5 = 3 3 x  1  = 3 3 x 1.5 = 4.5 4.5 x 2 = 9   Hence, the odd number is 10.

Q: Which of the following is the sixth to the left of the twentieth from the left end of the below arrangement ?BM%R#J@K!DF69L4*15NEP23AYQZ#7UG 2611 0

  • 1
    L
    Correct
    Wrong
  • 2
    K
    Correct
    Wrong
  • 3
    4
    Correct
    Wrong
  • 4
    9
    Correct
    Wrong
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Answer : 1. "L"
Explanation :

Answer: A) L Explanation: The twentieth element in the above arrangement is 'E'.Then, the sixth element to the left of 'E' is 'L'.

Q: How many four digit even numbers can be formed using the digits {2, 7, 5, 3, 9, 1} ? 2608 0

  • 1
    59
    Correct
    Wrong
  • 2
    60
    Correct
    Wrong
  • 3
    61
    Correct
    Wrong
  • 4
    64
    Correct
    Wrong
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Answer : 2. "60"
Explanation :

Answer: B) 60 Explanation: The given digits are 1, 2, 3, 5, 7, 9   A number is even when its units digit is even. Of the given digits, two is the only even digit.Units place is filled with only '2' and the remaining three places can be filled in ⁵P₃ ways.   Number of even numbers = ⁵P₃ = 60.

Q: Which of the following is NOT true about energy balance? 2606 0

  • 1
    Inactive people use more energy so they should consume fewer calories.
    Correct
    Wrong
  • 2
    Energy balance is the balance between the amount of calories consumed and the amount used for energy.
    Correct
    Wrong
  • 3
    Energy balance is influenced by the amount of exercise one gets and their dietary habits.
    Correct
    Wrong
  • 4
    Stored body fat will increase if calorie intake is greater than energy used.
    Correct
    Wrong
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Answer : 1. "Inactive people use more energy so they should consume fewer calories."
Explanation :

Answer: A) Inactive people use more energy so they should consume fewer calories. Explanation: The given statement option A) is False regarding energy balance.It should be "Inactive people use less energy so they should consume fewer calories."

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