IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: The average number of visitors of a library in the first 4 days of a week was 58. The average for the 2nd, 3rd, 4th and 5th days was 60.If the number of visitors on the 1st and 5th days were in the ratio 8 : 9. Then what is the number of visitors on the 5th day of the library ? 3070 0

  • 1
    54
    सही
    गलत
  • 2
    64
    सही
    गलत
  • 3
    68
    सही
    गलत
  • 4
    72
    सही
    गलत
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उत्तर : 4. "72"
व्याख्या :

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.

प्र: Sugar Bowl of the World? 3063 0

  • 1
    Cuba
    सही
    गलत
  • 2
    Brazil
    सही
    गलत
  • 3
    India
    सही
    गलत
  • 4
    Australia
    सही
    गलत
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उत्तर : 2. "Brazil"
व्याख्या :

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.

प्र: Happiness is to 517768399 as senipah is to 3057 0

  • 1
    9836715
    सही
    गलत
  • 2
    9386615
    सही
    गलत
  • 3
    9386715
    सही
    गलत
  • 4
    9386517
    सही
    गलत
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उत्तर : 3. "9386715"
व्याख्या :

Answer: C) 9386715 Explanation: If each consecutive letter in "happiness" relates to the consecutive numbers in 517768399, then H=5, A=1, P=7, I=6, N=8, E=3 and S=9. Using the numbers that relate to the letters in 'senipah', you will arrive at SENIPAH = 9386715.   Hence, Happiness is to 517768399 as senipah is to 9386715.

प्र: A merchant buys two articles for Rs.600. He sells one of them at a profit of 22% and the other at a loss of 8% and makes no profit or loss in the end. What is the selling price of the article that he sold at a loss ? 3049 0

  • 1
    Rs. 404.80
    सही
    गलत
  • 2
    Rs. 536.80
    सही
    गलत
  • 3
    Rs.440
    सही
    गलत
  • 4
    Rs. 160
    सही
    गलत
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उत्तर : 1. "Rs. 404.80"
व्याख्या :

Answer: A) Rs. 404.80 Explanation: Let C1 be the cost price of the first article and C2 be the cost price of the second article.Let the first article be sold at a profit of 22%, while the second one be sold at a loss of 8%. We know, C1 + C2 = 600.The first article was sold at a profit of 22%. Therefore, the selling price of the first article = C1 + (22/100)C1 = 1.22C1The second article was sold at a loss of 8%. Therefore, the selling price of the second article = C2 - (8/100)C2 = 0.92C2. The total selling price of the first and second article = 1.22C1 + 0.92C2. As the merchant did not make any profit or loss in the entire transaction, his combined selling price of article 1 and 2 is the same as the cost price of article 1 and 2. Therefore, 1.22C1 + 0.92C2 = C1+C2 = 600As C1 + C2 = 600, C2 = 600 - C1. Substituting this in 1.22C1 + 0.92C2 = 600, we get1.22C1 + 0.92(600 - C1) = 600or 1.22C1 - 0.92C1 = 600 - 0.92*600or 0.3C1 = 0.08*600 = 48or C1 = 48/(0.3) = 160.If C1 = 160, then C2 = 600 - 160 = 440.The item that is sold at loss is article 2. The selling price of article 2 = 0.92*C2 = 0.92*440 = 404.80.

प्र: A 300m race is held between two players running 3m/s and 5m/s in swimming pool of 50m long. how many times the two player meet in opposite direction till the faster one completes the race ? 3045 0

  • 1
    3 times
    सही
    गलत
  • 2
    4 times
    सही
    गलत
  • 3
    5 times
    सही
    गलत
  • 4
    2 times
    सही
    गलत
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उत्तर : 1. "3 times"
व्याख्या :

Answer: A) 3 times Explanation: Let us assume A is the faster and B is slower, A takes 10s to finish a lap of 50 m, B takes 17s(approx) to finish a lap of 50 m.So at 11th sec A starts his 2nd lap by the time B will be in between so that is the first time they will meet each other, at 21st sec A starts his 3rd lap by the time B will be coming back to finish his 2nd lap. So that is the second time they meet in opposite. Then at 31st sec A will start his 4th lap by the time B would not even finish 2nd lap as he take 34(2*17) sec to finish 2 laps. So at 35th sec B will start his 3rd lap by the time A will be coming back to finish his 4th lap in the half way so they will meet 3rd time. At 41st sec A will start its fifth lap by the time B will be going to finish 3rd lap in same direction. At 50th second both will complete A's 5th lap and B's 3rd lap. So they will start next lap(A's 6th and B's 4th) from the same point in same direction. And A will finish the race after completing 300m(6*50) total distance and then they wont meet opposite to each other. So totally they met 3 times in opposite direction.

प्र: Ayurveda Owes its Origin to 3045 0

  • 1
    Yajurveda
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    गलत
  • 2
    Atharvaveda
    सही
    गलत
  • 3
    Rigveda
    सही
    गलत
  • 4
    Samaveda
    सही
    गलत
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उत्तर : 2. "Atharvaveda"
व्याख्या :

Answer: B) Atharvaveda Explanation: Ayurveda Owes its Origin to Atharvaveda.   The early history of ayurveda asserts that around 1500 BC, ayurveda's fundamental and applied principles got organised and enunciated. In this historical construction, Ayurveda traces its origins to the Vedas, Atharvaveda in particular, and is connected to Hindu religion. Atharvaveda (one of the four most ancient books of Indian knowledge, wisdom and culture) contains 114 hymns or formulations for the treatment of diseases. Ayurveda originated in and developed from these hymns. In this sense, ayurveda is considered by some to have divine origin. Indian medicine has a long history, and is one of the oldest organised systems of medicine. Its earliest concepts are set out in the sacred writings called the Vedas, especially in the metrical passages of the Atharvaveda.

प्र: The wealthiest citizens of ancient rome were 3044 0

  • 1
    patricians
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    गलत
  • 2
    laborers
    सही
    गलत
  • 3
    farmers
    सही
    गलत
  • 4
    plebeians
    सही
    गलत
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उत्तर : 1. "patricians"
व्याख्या :

Answer: A) patricians Explanation:

प्र: The study of Heavenly bodies is called 3036 0

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    Astronomy
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    गलत
  • 2
    Astrology
    सही
    गलत
  • 3
    Astrophysics
    सही
    गलत
  • 4
    Astronautics
    सही
    गलत
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उत्तर : 1. "Astronomy"
व्याख्या :

Answer: A) Astronomy Explanation: Astronomy is the study of planets and heavenly bodies. Historically, astronomy has focused on observations of heavenly bodies. It is a close cousin to astrophysics. Succinctly put, astrophysics involves the study of the physics of astronomy and concentrates on the behavior, properties and motion of objects out there.

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