IIT JEE Practice Question and Answer

Q: Please enter the Missing number: 4 8 14 22 ? 1933 0

  • 1
    28
    Correct
    Wrong
  • 2
    32
    Correct
    Wrong
  • 3
    46
    Correct
    Wrong
  • 4
    36
    Correct
    Wrong
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Answer : 2. "32"
Explanation :

Answer: B) 32 Explanation: Here the given series follows a pattern that, 22 - 0 = 4   32 - 1 = 8   42 - 2 = 14 52 - 3 = 22 62 - 4 = 32 Hence, the missing number is 32     Method 2 :: The difference between 4 and 8 is 4, the difference between 8 and 14 is 6, the difference between 14 and 22 is 8. So the next difference between 22 and the next number will be 10 since it follows (4,6,8,10 - add +2 each time) Hence, 22 + 10 = 32 is the missing number.

Q: Alcohol first impairs your 1933 0

  • 1
    hearing skills
    Correct
    Wrong
  • 2
    colour recognition
    Correct
    Wrong
  • 3
    judgement
    Correct
    Wrong
  • 4
    heart
    Correct
    Wrong
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Answer : 3. "judgement"
Explanation :

Answer: C) judgement Explanation: The reason why drunk people acts like stupids is when they drink, especially if they drink a lot, first their brain becomes impaired by such large quantities of alcohol that it cannot operate properly. So they cannot judge anything.   Hence, Alcohol first impairs your Judgement.

Q: The oxidation number of Cr in K2Cr2O7 is 1932 0

  • 1
    +6
    Correct
    Wrong
  • 2
    -5
    Correct
    Wrong
  • 3
    +3
    Correct
    Wrong
  • 4
    -4
    Correct
    Wrong
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Answer : 1. "+6"
Explanation :

Answer: A) +6 Explanation: We will rewrite the formula as an equation. 2K + 2Cr + 7O = 0 The zero comes from there being no overall charge on the compound. Each oxidation number is represented by the element's symbol. Since this compound is not a peroxide or superoxide, the oxidation value for O is -2 K being in group 1 has a +1 charge and therefore has an oxidation number of K is +1 Now, by putting known values in we have: 2(+1) + 2(Cr) + 7(-2) = 0 2 + 2Cr -14 = 0 2Cr = +12 Cr = +6.

Q: How many inches is 5' 4"? 1932 0

  • 1
    66
    Correct
    Wrong
  • 2
    64
    Correct
    Wrong
  • 3
    62
    Correct
    Wrong
  • 4
    60
    Correct
    Wrong
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Answer : 2. "64"
Explanation :

Answer: B) 64 Explanation: We know 1 feet = 12 inches. According to the question, 5' 4''  =  5 feet 4 inches = 12 x 5 + 4 = 64 inches.   Hence,  5' 4''  =  5 feet 4 inches = 64 inches.

Q: In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant, approximately what percentage of the selling price is the profit ? 1931 0

  • 1
    60%
    Correct
    Wrong
  • 2
    50%
    Correct
    Wrong
  • 3
    70%
    Correct
    Wrong
  • 4
    45%
    Correct
    Wrong
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Answer : 3. "70%"
Explanation :

Answer: C) 70% Explanation: Let C.P.= Rs. 100. Then, Profit = Rs. 320, S.P. = Rs. 420. New C.P. = 125% of Rs. 100 = Rs. 125New S.P. = Rs. 420. Profit = Rs. (420 - 125) = Rs. 295 Required percentage = (295/420) * 100 = 70%(approx)

Q: A Sarcomere is the distance between two 1930 0

  • 1
    Z discs
    Correct
    Wrong
  • 2
    H zones
    Correct
    Wrong
  • 3
    A bands
    Correct
    Wrong
  • 4
    I bands
    Correct
    Wrong
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Answer : 1. "Z discs"
Explanation :

Answer: A) Z discs Explanation: A sarcomere is the basic unit of striated muscle tissue. It is the repeating unit between two Z lines. Skeletal muscles are composed of tubular muscle cells (myocytes called muscle fibers or myofibers) which are formed in a process known as myogenesis. Muscle fibers contain numerous tubular myofibrils. Myofibrils are composed of repeating sections of sarcomeres, which appear under the microscope as alternating dark and light bands. Sarcomeres are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.   A muscle fiber from a biceps muscle may contain 100,000 sarcomeres.

Q: Find the Odd one out of the following Numbers? 1929 0

  • 1
    3
    Correct
    Wrong
  • 2
    19
    Correct
    Wrong
  • 3
    67
    Correct
    Wrong
  • 4
    133
    Correct
    Wrong
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Answer : 4. "133"
Explanation :

Answer: D) 133 Explanation: Here among the given numbers, 3, 19, 67 are prime numbers. And 133 is not a prime number.   Hence, the odd number of the given numbers is 133.

Q: Study of Rocks is called 1929 0

  • 1
    Geology
    Correct
    Wrong
  • 2
    Cytology
    Correct
    Wrong
  • 3
    Petrology
    Correct
    Wrong
  • 4
    Petology
    Correct
    Wrong
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Answer : 3. "Petrology"
Explanation :

Answer: C) Petrology Explanation: The scientific study of rocks is called petrology, which is an essential component of geology.

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