IIT JEE Practice Question and Answer

Q: What place is designated as 0 degrees longitude? 1473 0

  • 1
    Greenwich
    Correct
    Wrong
  • 2
    Prime meridian
    Correct
    Wrong
  • 3
    Tibet
    Correct
    Wrong
  • 4
    Norway
    Correct
    Wrong
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Answer : 1. "Greenwich"
Explanation :

Answer: A) Greenwich Explanation: The place which is designated as 0 degrees longitude is Greenwich, England.

Q: Anu's present age is 9 years more than that of what Raj's age will be after five years. Raj's present age is seven years more than that of what Renu's age was 4 years ago. Renu's present age is 19 years. What will be Anu's age after 5 years ? 1472 0

  • 1
    39 yrs
    Correct
    Wrong
  • 2
    36 yrs
    Correct
    Wrong
  • 3
    46 yrs
    Correct
    Wrong
  • 4
    41 yrs
    Correct
    Wrong
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Answer : 4. "41 yrs"
Explanation :

Answer: D) 41 yrs Explanation: Anu = (Raj + 5) + 9 = Raj + 14 -------- (I) Raj = (Renu - 4) + 7 = Renu + 3 ------- (II) Raj's age = 19 + 3 = 22 years After 5 years Anu's age = 22 + 14 + 5 = 41 years

Q: Using numbers from 0 to 9 the number of 5 digit telephone numbers that can be formed is 1472 0

  • 1
    1,00,000
    Correct
    Wrong
  • 2
    59,049
    Correct
    Wrong
  • 3
    3439
    Correct
    Wrong
  • 4
    6561
    Correct
    Wrong
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Answer : 3. "3439"
Explanation :

Answer: C) 3439 Explanation: The numbers 0,1,2,3,4,5,6,7,8,9 are 10 in number while preparing telephone numbers any number can be used any number of times.   This can be done in 105ways, but '0' is there   So, the numbers starting with '0' are to be excluded is 94 numbers.    Total 5 digit telephone numbers = 105- 94 = 3439

Q: A polygon has 44 diagonals, then the number of its sides are ? 1472 0

  • 1
    13
    Correct
    Wrong
  • 2
    9
    Correct
    Wrong
  • 3
    11
    Correct
    Wrong
  • 4
    7
    Correct
    Wrong
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Answer : 3. "11"
Explanation :

Answer: C) 11 Explanation: Let the number of sides be n.  The number of diagonals is given by nC2 - n   Therefore, nC2 - n = 44, n>0  nC2 - n = 44 n2 - 3n - 88 = 0  n2 -11n + 8n - 88 = 0   n(n - 11) + 8(n - 11) = 0  n = -8 or n = 11.   As n>0, n will not be -8. Therefore, n=11.

Q: Where was India's first F1 circuit built? 1472 0

  • 1
    Jaipur
    Correct
    Wrong
  • 2
    Coimbatore
    Correct
    Wrong
  • 3
    Noida
    Correct
    Wrong
  • 4
    Chennai
    Correct
    Wrong
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Answer : 3. "Noida"
Explanation :

Answer: C) Noida Explanation: Fi circuit refers to Formula One, is the highest class of open-wheeled auto racing defined by FIA, motorsport's world governing body.   The Buddh International Circuit is an Indian motor racing circuit in Greater Noida, Uttar Pradesh was India's first F1 circuit.

Q: Which of the following is not a prime number? 1472 0

  • 1
    5
    Correct
    Wrong
  • 2
    11
    Correct
    Wrong
  • 3
    21
    Correct
    Wrong
  • 4
    37
    Correct
    Wrong
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Answer : 3. "21"
Explanation :

Answer: C) 21 Explanation: A prime number is a whole number greater than 1 whose only factors are 1 and itself.   Factors of 5 are 1, 5 Factors of 11 are 1, 11 Factors of 21 are 1, 3, 7, 21 Factors of 37 are 1, 37.   Hence, according to the definition of a prime number, 21 is not a prime number as it has more than two factors.

Q: The heat from the sun reaches earth through Convection. 1471 0

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

Answer: B) FALSE Explanation: The given statement, The heat from the sun reaches earth through Convection is FALSE.   Heat from the sun actually reaches the earth through Radiation. The process occurs through electromagnetic radiation, specifically, in which molecules are warmed when the heat reaches them, and these molecules then warm other molecules touching them, which continues until we feel the sun's heat.

Q: Why is Meiosis called Reduction Division? 1471 0

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Answer :
Explanation :

Meiosis :: Meiosis is a type of cell division that reduces the chromosome number by half in daughter cells, creating four haploid cells, each genetically distinct from the parent cell that gave rise to them. Why it is called as Reduction Division :: 1. As the Meiosis division process involves in reduction of chromosome number in the daughter cells to half the number in the parent cell, this process is called Reduction Division.Meiosis creates gametes (egg and sperm cells). 2. The resulting gametes have 23 new chromosomes, one member of each of the 23 pairs, representing unique combinations of the original maternal and paternal copies.

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