IIT JEE Practice Question and Answer

Q: The first synthetic fibre made by man was ____ ? 4679 1

  • 1
    Rayon
    Correct
    Wrong
  • 2
    Terycott
    Correct
    Wrong
  • 3
    Polyester
    Correct
    Wrong
  • 4
    Nylon
    Correct
    Wrong
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Answer : 4. "Nylon"
Explanation :

Answer: D) Nylon Explanation:

Q: Which is true of the 1912 presidential election? 4677 0

  • 1
    Because all three major candidates were Progressive, the Socialist won
    Correct
    Wrong
  • 2
    Because all three major candidates were Progressive, Progressive votes were split
    Correct
    Wrong
  • 3
    Although none of the candidates was Progressive, the Progressives decided the election
    Correct
    Wrong
  • 4
    Although none of the candidates was Progressive, Progressive ideas were important
    Correct
    Wrong
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Answer : 2. "Because all three major candidates were Progressive, Progressive votes were split"
Explanation :

Answer: B) Because all three major candidates were Progressive, Progressive votes were split Explanation: Because all three major candidates were Progressive, Progressive votes were split" is the one among the following that is true of the 1912 presidential election. The correct option among all the options that are given in the question is the option "B".

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Answer : 2. "26.166 minutes"
Explanation :

Answer: B) 26.166 minutes Explanation: Upto first 5 minutes I, J and K will fill => 5[(1/20)+(1/30)+(1/40)] = 65/120 For next 6 minutes, J and K will fill => 6[(1/30)+(1/40)] = 42/120 So tank filled upto first 11 minutes = (65/120) + (42/120) = 107/120 So remaining tank = 13/120 Now at the moment filling with C and leakage @ 1/60 per minute= (1/40) - (1/70) = 3/280.So time taken to fill remaining 13/120 tank =(13/120) /(3/280) = 91/6 minutes   Hence total time taken to completely fill the tank = 5 + 6 + 91/6 = 26.16 minutes.

Q: A hater of knowledge and learning is 4656 0

  • 1
    Philologist
    Correct
    Wrong
  • 2
    Misologist
    Correct
    Wrong
  • 3
    Bibliophile
    Correct
    Wrong
  • 4
    Misogynist
    Correct
    Wrong
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Answer : 2. "Misologist"
Explanation :

Answer: B) Misologist Explanation: The one word substitution for a hater of knowledge and learning is Misologist.

Q: Solve the equation 122x+1 = 1 ? 4633 0

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

Answer: A) -1/2 Explanation: Rewrite equation as 122x+1 = 120   Leads to 2x + 1 = 0    Solve for x : x = -1/2

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Answer : 2. "8"
Explanation :

Answer: B) 8 Explanation:     AmitBharatNo.of Days4540Efficiency2.22Percent(=145)2.5 Percent(=140)   Amit did the work in 56 days = 56×145×2=2845    Therefore, Rest work 17/45 was done by Amit and Bharath = 174517360 = 8 days       ( since Amit and Bharath  do the work in one day = 145+140=17360)

Q: A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow ? 4628 0

  • 1
    3/17
    Correct
    Wrong
  • 2
    4/21
    Correct
    Wrong
  • 3
    2/21
    Correct
    Wrong
  • 4
    5/17
    Correct
    Wrong
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Answer : 3. "2/21"
Explanation :

Answer: C) 2/21 Explanation: Given that there are three blue marbles, four red marbles, six green marbles and two yellow marbles.   Probability that both marbles are blue = ³C₂/¹⁵C₂ = (3 x 2)/(15 x 14) = 1/35 Probability that both are yellow = ²C₂/¹⁵C₂ = (2 x 1)/(15 x 14) = 1/105 Probability that one blue and other is yellow = (³C₁ x ²C₁)/¹⁵C₂ = (2 x 3 x 2)/(15 x 14) = 2/35   Required probability = 1/35 + 1/105 + 2/35 = 3/35 + 1/105 = 1/35(3 + 1/3) = 10/(3 x 35) = 2/21

Q: In India, planned economy is based on 4618 0

  • 1
    Mixed Economy System
    Correct
    Wrong
  • 2
    Capitalist System
    Correct
    Wrong
  • 3
    Gandhian System
    Correct
    Wrong
  • 4
    Socialist System
    Correct
    Wrong
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Answer : 4. "Socialist System"
Explanation :

Answer: D) Socialist System Explanation:

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