IIT JEE Practice Question and Answer

Q: Missing Letter Challenge 2325 0

  • 1
    I
    Correct
    Wrong
  • 2
    M
    Correct
    Wrong
  • 3
    P
    Correct
    Wrong
  • 4
    L
    Correct
    Wrong
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Answer : 4. "L"
Explanation :

Answer: D) L Explanation: Here the letters follow the rule (AxZ)+(A+Z) The number corresponding to the letters are used in the rule A=1, Z=26 => 26x1 + 1 + 26 = 26+27 = 53 =  053 (LxP)+(L+P) = (12 x16) + 12 + 16 = 192+28 = 220 Similarly (11x12) + 11 + 12 => 132 + 23 = 155

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Answer : 4. "Tanuja"
Explanation :

Answer: D) Tanuja Explanation: The four vocal musicians and one actress in the group are given. Two dancers are Shailaja and Tanuja. Two violinists are Girija and Vanaja. Since Jalaja and Shailaja cannot be violinists, so remaining two violinists are Tanuja and Pooja. Clearly, Tanuja is both a violinist and a dancer.

Q: Kamal consistently runs 240 meters a day and on Saturday he runs for 400 meters. How many kilometers will he have to run in four weeks ? 2322 0

  • 1
    5.75 kms
    Correct
    Wrong
  • 2
    7.36 kms
    Correct
    Wrong
  • 3
    8.2 kms
    Correct
    Wrong
  • 4
    6.98 kms
    Correct
    Wrong
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Answer : 2. "7.36 kms"
Explanation :

Answer: B) 7.36 kms Explanation: Total running distance in four weeks = (24 x 240) + (4 x 400) = 5760 + 1600 = 7360 meters = 7360/1000 => 7.36 kms

Q: Is rusting a physical or chemical change? 2321 0

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Answer :
Explanation :

In chemistry rusting is called as oxidation. Oxidation is a chemical process where metal gains oxygen and become oxide. In rusting the Iron ore make a chemical reaction with the oxygen in the presence of water and environmental or atmospheric moisture to produce an Iron oxide. Iron oxide is otherwise called as rust. The rusting of iron is a chemical change because it is two substances reacting together to make a new substance.    Rusting would only be a physical change if iron molecules remained pure iron throughout the process.

Q: Crack the Missing Letter Puzzle? 2320 0

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

Answer: C) L Explanation: 13 x 2 = 26 => Z (opposite side) 12 x 2 = 24 => X (opposite side) 13 x 1 = 13 => M (opposite side) 12 x 1 = 12 => L (opposite side)

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Answer : 1. "99"
Explanation :

Answer: A) 99 Explanation: Let, Distance between A and B = d   Distance travelled by P while it meets Q = d + 11   Distance travelled by Q while it meets P = d – 11   Distance travelled by Q while it meets R = d + 9   Distance travelled by R while it meets Q = d – 9   Here the ratio of speeds of P & Q => SP : SQ = d + 11 : d – 11   The ratio of speeds of Q & R => SQ : SR = d + 9 : d – 9   But given Ratio of speeds of P & R => P : R = 3 : 2  SPSR = SPSQxSQSR = d+11d+9d-11d-9   => d+11d+9d-11d-9 = 3/2   =>  d = 1, 99   => d = 99 satisfies.   Therefore, Distance between A and B = 99

Q: The average temperature of Monday to Wednesday was 37 C and of Tuesday to Thursday was 34 C. If the temperature on Thursday was 4/5 th of that of Monday, the temperature on Thursday was ? 2314 0

  • 1
    35 c
    Correct
    Wrong
  • 2
    36 c
    Correct
    Wrong
  • 3
    34 c
    Correct
    Wrong
  • 4
    32 c
    Correct
    Wrong
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Answer : 2. "36 c"
Explanation :

Answer: B) 36 c Explanation: Monday + Tuesday + Wednesday = 37 x 3 -----------(1)Tuesday + Wednesday + Thursday = 34 x 3---------(2)Thursday = 4/5 of Monday ------------------(3)subtract eqn (1) from (2) we get,Thursday - Monday = -9 => Monday - Thursday = 9.......(4)From (3) & (4), we get So,Thursday = 36 C

Q: Two bottles contains mixture of milk and water. First bottle contains 64% milk and second bottle contains 26% water. In what ratio these two mixtures are mixed so that new mixture contains 68% milk? 2309 0

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

Answer: A) 3 : 2 Explanation: % of milk in first bottle = 64% % of milk in second bottle = 100 - 26 = 74% Now, ATQ   64%            74%                   68%   6                    4   Hence, by using allegation method,   Required ratio = 3 : 2

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