IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: 4 men and 6 women can complete a work in 8 days, while 3 men and 7 women can complete it in 10 days. In how many days will 10 women complete it ? 1158 0

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    40 days
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  • 2
    36 days
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  • 3
    32 days
    सही
    गलत
  • 4
    34 days
    सही
    गलत
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उत्तर : 1. "40 days"
व्याख्या :

Answer: A) 40 days Explanation: Let 1 man's 1 day work = x and 1 woman's 1 day work = y.Then, 4x + 6y = 1/8 and 3x + 7y = 1/10Solving these two equations, we get:x = 11/400 and y = 1/40010 woman's 1 day work = (1/400 x 10) = 1/40. Hence, 10 women will complete the work in 40 days.

प्र: The edge of three cubes of metal is 3 m, 4 m and 5 m. They are melted and formed into a single cube. Find the edge of the new cube  ? 1158 0

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    15 m
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  • 2
    4 m
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  • 3
    6 m
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  • 4
    9 m
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उत्तर : 3. "6 m"
व्याख्या :

Answer: C) 6 m Explanation: The edge of the new cube is = 33+43+53 = a3 => a = 6 m.

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उत्तर : 3. "Neither A nor B follows"
व्याख्या :

Answer: C) Neither A nor B follows Explanation: There is no indication that Indian scientists are incapable of developing enzymes. There could be any number of reasons why Indian scientists used Russian enzymes. So conclusion A does not follow. In addition, cost is not discussed in the passage at all. There is no mention of a correlation between cost and extraction of proteins. Thus, conclusion B does not follow either.

प्र: Which Noble Gas has the highest First Ionization Energy? 1155 0

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    Neon
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  • 2
    Helium
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  • 3
    Argon
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  • 4
    Xenon
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उत्तर : 2. "Helium"
व्याख्या :

Answer: B) Helium Explanation: Helium has the highest First Ionization Energy in the Noble Gases group. Ionization Energy :: Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms. Atoms are more stable when they have full valence shells. Noble Gases have a very stable electron configuration, therefore, they have the highest amount of ionization energy within their periods. It decreases down a family because electrons farther from the nucleus are easier to remove. Ionization Energy levels of Noble Gases group in Descending Order :: He, Ne, Ar, Kr, Xe, Rn

प्र: Which is in India wins Pierre L'Enfant International Planning Excellence Award 2017 ? 1154 0

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    Banglore
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  • 2
    Hyderabad
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  • 3
    Bhubaneshwar
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  • 4
    Delhi
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उत्तर : 3. "Bhubaneshwar"
व्याख्या :

Answer: C) Bhubaneshwar Explanation: The American Planning Association (APA) has announced this year's international excellence award for the Bhubaneswar smart city project. The award called Pierre L'Enfant International Planning Excellence Award 2017 will be given on May 8 in New York city. This is the first time in the 50 years history of APA's annual award programme that an Indian city has been recognised for its planning efforts.

प्र: In a mixture, the ratio of juice and water is 4 : 3. By adding 6 litre water the ratio of juice and water will be 8 : 7. What is the amount of juice in the original mixture ? 1153 0

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    38 lit
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  • 2
    96 lit
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  • 3
    48 lit
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  • 4
    52 lit
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उत्तर : 3. "48 lit"
व्याख्या :

Answer: C) 48 lit Explanation: Let the amount of juice and water in original mixture '4x' litre and '3x' litre respectively. According to given data, 4x/3x+6 =8/7 28x=24x+48 28x–24x=48 4x = 48 x = 12 Amount of juice = 4x = 4×12 = 48 litre.

प्र: In a slip test, K got the 15th rank and he was 44th from the bottom of the list of passed students. 4 students did not take up the slip test and 3 students were failed. What is the total strenght of the class ? 1153 0

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    63
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  • 2
    62
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  • 3
    64
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  • 4
    65
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उत्तर : 4. "65"
व्याख्या :

Answer: D) 65 Explanation: Total strength of the class is given by 15 + 44 + 4 + 3 - 1 = 65

प्र: A can finish a work in 18 days and B can do the same work in half the time taken by A. then, working together, what part of the same work they can finish in a day ? 1152 0

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    Total work
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  • 2
    One-fourth work
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  • 3
    Half work
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  • 4
    Two-third work
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उत्तर : 3. "Half work"
व्याख्या :

Answer: C) Half work Explanation: A can do the work = 18 daysB can do the work = 18/2 = 9 days(A + B)'s 1 day work = 1/18 + 1/9 = 1/6=> In 3 days = 3x1/6 = 1/2 work is completed.

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