IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: A man covered a certain distance at some speed. Had he moved 3 kmph faster, he would have taken 40 minutes less. If he had moved 2 kmph slower, he would have taken 40 minutes more. The distance (in km) is 1657 0

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    30
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    36
    सही
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  • 3
    40
    सही
    गलत
  • 4
    42
    सही
    गलत
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उत्तर : 3. "40"
व्याख्या :

Answer: C) 40 Explanation: Let distance = x km and usual rate = y kmph.Then, x/y - x/(y+3) = 40/60 --> 2y (y+3) = 9x ----- (i)Also, x/(y-2) - x/y = 40/60 --> y(y-2) = 3x -------- (ii)On dividing (i) by (ii), we get: x = 40 km.

प्र: P alone can do a piece of work in 24 days. The time taken by P to complete one-third of work is equal to time taken by Q to complete half of the work. How many days are required to complete by P and Q working together ? 1657 0

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    9 3/5 days
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    7 days
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    6 3/7 days
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  • 4
    8 days
    सही
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उत्तर : 1. "9 3/5 days"
व्याख्या :

Answer: A) 9 3/5 days Explanation: Let the total work be 'W' As per the given information, P can complete the work 'W' in 24 days. => one day work of P = W/24 And also given that, The time taken by P to complete one-third of work is equal to time taken by Q to complete half of the work => PW/3 = QW/2 => P's 1 day =    W/24    ?    =      W/3 =>  ?  = 24W/3W  = 8 => QW/2 = 8 days => Q alone can complete the work W in 16 days => P + Q can complete the work in 1/24 + 1/16 = 5/48 => 48/5 days = 9 3/5 days.

प्र: What is not a reason christian missionaries went to Asia? 1656 0

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उत्तर :
व्याख्या :

To obtain exotic spices or to find trade items are not the reasons for christian missionaries went to Asia.

प्र: photosynthesis takes place faster in 1655 0

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    darkness
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    red light
    सही
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    white light
    सही
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  • 4
    yellow light
    सही
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उत्तर : 3. "white light"
व्याख्या :

Answer: C) white light Explanation: As far as the rate of photosynthesis is concerned, it is fastest in white light making the rate of photosynthesis maximum. After White, We Have Violet Light Where Photosynthesis Occur To A Higher Extent as It Has The Shortest Wavelength Hence Has The Max Energy.   So The Order Is  ::  white>violet>blue.

प्र: Below question has with a part of it underlined. The question is followed by four alternatives to replace the underlined part of the sentence. Choose the best alternative which is grammatically correct. In this particular job we have discovered that to be diligent is more important than being bright. 1655 0

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    for one to be diligent is more important than being bright.
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    by being diligent is important than being bright.
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    being diligent is more important than being bright.
    सही
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  • 4
    diligence is more important than brightness.
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उत्तर : 4. "diligence is more important than brightness."
व्याख्या :

Answer: D) diligence is more important than brightness. Explanation: Parallel construction error in the original statement. A similar form is required on each side of the comparison. " Diligence - brightness ".

प्र: Find the odd one out of the group ? 1653 0

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    708
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    392
    सही
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  • 3
    618
    सही
    गलत
  • 4
    816
    सही
    गलत
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उत्तर : 2. "392"
व्याख्या :

Answer: B) 392 Explanation: The sum of the digits in 708, 618 and 816 is 15, but not in 392.

प्र: How many blocks in a mile? 1653 0

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    8 - 12
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  • 2
    12 - 15
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  • 3
    8 - 15
    सही
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  • 4
    15 - 20
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उत्तर : 4. "15 - 20"
व्याख्या :

Answer: D) 15 - 20 Explanation: About 15 - 20 blocks become a 1 mile. City blocks differ in sizes. They do not have a standard measurement. Every geographical area has its own average city block size. A city block is a rectangular area in a city with several buildings with the streets around. It is also called "block" which, in a dictionary, is defined as an informal unit of distance from one intersection to the next.

प्र: What does the judicial branch do? 1653 0

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उत्तर :
व्याख्या :

The United States government has 3 branches, which all serve an important role in running the government and keeping our system of laws in place.   1. The legislative branch 2. The executive branch  3. The judicial branch   The legislative branch makes the laws while the executive branch enforces these laws.  The judicial branch is a system of courts that applies the laws.   Both the federal government and each of the 5 states have individual judicial branches which all serve this purpose.   For example ::  If the federal government were like a basketball game, the judicial branch is much like the referee that helps settle disputes. The executive branch and the legislative branch are often like the players in the game trying to score points against each other, and the judicial branch is there to clarify the rules and make sure each side is acting fairly.

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