IIT JEE Practice Question and Answer

Q: A large tanker can be filled by two pipes A and B in 60 and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half ? 3051 0

  • 1
    31 min
    Correct
    Wrong
  • 2
    29 min
    Correct
    Wrong
  • 3
    28 min
    Correct
    Wrong
  • 4
    30 min
    Correct
    Wrong
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Answer : 4. "30 min"
Explanation :

Answer: D) 30 min Explanation: Part filled by (A + B) in 1 minute = (1/60 + 1/40) = 1/24Suppose the tank is filled in x minutes.Then, x/2(1/24 + 1/40) = 1(x/2) * (1/15) = 1 => x = 30 min.

Q: A does half as much work as Band C does half as much work as A and B together. If C alone can finish the work in 40 days, then together ,all will finish the work in  ? 3050 0

  • 1
    17 + 4/7 days
    Correct
    Wrong
  • 2
    13 + 1/3 days
    Correct
    Wrong
  • 3
    15 + 3/2 days
    Correct
    Wrong
  • 4
    16 days
    Correct
    Wrong
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Answer : 2. "13 + 1/3 days"
Explanation :

Answer: B) 13 + 1/3 days Explanation: C alone can finish the work in 40 days.As given C does half as much work as A and B together => (A + B) can do it in 20 days(A + B)s 1 days wok = 1/20.A's 1 days work : B's 1 days Work = 1/2 : 1 = 1:2(given)A's 1 day’s work = (1/20) x (1/3) = (1/60) [Divide 1/20 in the raio 1:2]B's 1 days work = (1/20) x (2/3) = 1/30(A+B+C)'s 1 day's work = (1/60) + (1/30) + (1/40) = 9/120 = 3/40 All the three together will finish it in 40/3 = 13 and 1/3 days.

Q: Study of teeth is called 3050 0

  • 1
    Pedagogy
    Correct
    Wrong
  • 2
    Ornithology
    Correct
    Wrong
  • 3
    Orthoepy
    Correct
    Wrong
  • 4
    Odontology
    Correct
    Wrong
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Answer : 4. "Odontology"
Explanation :

Answer: D) Odontology Explanation: The study or scientific study of the structure, development, and abnormalities of the teeth is called Odontology. The science that studies teeth and their surrounding tissues, especially the prevention and cure of their diseases is called Dentology.

Q: In a regular week, there are 5 working days and for each day, the working hours are 8. A man gets Rs. 2.40 per hour for regular work and Rs. 3.20 per hours for overtime. If he earns Rs. 432 in 4 weeks, then how many hours does he work for ? 3048 0

  • 1
    145
    Correct
    Wrong
  • 2
    165
    Correct
    Wrong
  • 3
    175
    Correct
    Wrong
  • 4
    135
    Correct
    Wrong
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Answer : 3. "175"
Explanation :

Answer: C) 175 Explanation: Given that,  working days = 5  working hours = 8  A man get rupess per hour is Rs.2.40  So in one day the man get total rupees is 2.40 x 8 = 19.2  So in 5 days week the man get total rupees is 19.2 x 5 = 96  So in 4 week the man get total rupees is 96 x 4 = 384  So the man worked for = 160hours in 4 weeks    But given that the man earned Rs.432    Hence remaning money is (432-384 = 48)which is earn by doing overtime work   Overtime hours  = 48/3.20 = 15 So total worked hours is = 15 + 160 = 175.

Q: Why are yeast cells frequently used as hosts for cloning? 3046 0

  • 1
    they are eukaryotic cells
    Correct
    Wrong
  • 2
    they do not have plasmids
    Correct
    Wrong
  • 3
    only yeast cells allow the gene to be cloned
    Correct
    Wrong
  • 4
    they easily form colonies
    Correct
    Wrong
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Answer : 1. "they are eukaryotic cells"
Explanation :

Answer: A) they are eukaryotic cells Explanation: If you were to produce a protein in bacterial cloning systems, you would not get the same post transcriptional and post translational modifications because the prokaryotic and eukaryotic systems work differently on the modifications. Thus human recombinant protein genes are usually cloned in yeast cells. Also since they have a short generation time, they can be easily culture.

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Answer : 4. "72"
Explanation :

Answer: D) 72 Explanation: If number of visitors on 1st, 2nd, 3rd, 4th & 5th day are k, l, m, n & o respectively, thenk + l + m + n = 58 x 4 = 232 ---- (i) & l + m + n + o = 60 x 4 = 240 ---- (ii)Subtracting (i) from (ii), we get o-k = 8 ---(iii)Given, k/o = 8/9 ----(iv)So from (iii) & (iv), we geta = 64, e = 72Therefore, number of visitors on 5th day is 72.

Q: The value of money varies 3041 0

  • 1
    inversely with the price level
    Correct
    Wrong
  • 2
    directly with the price level
    Correct
    Wrong
  • 3
    directly with the volume of employment
    Correct
    Wrong
  • 4
    directly with the interest rate
    Correct
    Wrong
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Answer : 1. "inversely with the price level"
Explanation :

Answer: A) inversely with the price level Explanation:

Q: Sugar Bowl of the World? 3031 0

  • 1
    Cuba
    Correct
    Wrong
  • 2
    Brazil
    Correct
    Wrong
  • 3
    India
    Correct
    Wrong
  • 4
    Australia
    Correct
    Wrong
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Answer : 2. "Brazil"
Explanation :

Answer: B) Brazil Explanation: "Cuba" is the name of the country which was commonly known as the "Sugar Bowl of the World". It is called by this name because formerly it was the largest producer of Sugar, but now Brazil is currently the largest producer of Sugar. It is an island country in the Caribbean and is officially called as the Republic of Cuba.

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