IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: A group of men can complete a job in K hours. After every 4 hours, half the number of men working at that point of time leave the job. Continuing this way if the job is finished in 16 hours, what is the value of K ? 3486 0

  • 1
    7 hrs
    सही
    गलत
  • 2
    7.5 hrs
    सही
    गलत
  • 3
    8 hrs
    सही
    गलत
  • 4
    8.25 hrs
    सही
    गलत
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उत्तर : 2. "7.5 hrs"
व्याख्या :

Answer: B) 7.5 hrs Explanation: Let there are L men job requires LK man hours.   job completed in first 4 hrs = L x 4 = 4L job completed in next 4 hrs = 4 x L/2 = 2L job completed in next 4 hrs = 4 x L/4 = L job completed in last 4 hrs = 4 x L/8 = L/2 4L + 2L + L + L/2 = KL K = 7+1/2 = 7.5 hours.

प्र: Fresh grapes contain 60% water, while dry grapes contain 40% water. How many kgs of dry grapes can be obtained by 60 kg of fresh grapes? 3480 0

  • 1
    25 kgs
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    गलत
  • 2
    30 kgs
    सही
    गलत
  • 3
    35 kgs
    सही
    गलत
  • 4
    40 kgs
    सही
    गलत
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उत्तर : 4. "40 kgs"
व्याख्या :

Answer: D) 40 kgs Explanation: The fruit content in both the fresh fruit and dry fruit is the same. Let 'p' kgs of dry grapes are obtained from the 60 kgs of fresh grapes   => 60 x 40100 = p x 60100=> p = 40 kgs.   Therefore, 40 kgs of Dry grapes are obtained from 60 kgs of Fresh grapes.

प्र: Which is a green planet in the solar system? 3475 0

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    Pluto
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  • 2
    Venus
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  • 3
    Uranus
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    गलत
  • 4
    Mars
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उत्तर : 3. "Uranus"
व्याख्या :

Answer: C) Uranus Explanation: Uranus is the seventh planet from the Sun which looks green color. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both have different bulk chemical composition from that of the larger gas giants Jupiter and Saturn.   Colors of other planets:: Mercury - Gray or slightly brownish Venus - Pale yellow Earth - Blue with white clouds Mars - Mostly reddish brown Jupiter - Orange and white bands Saturn - Pale gold Uranus - Green Neptune - Pale blue Pluto - Light brown

प्र: Meaning of commercialisation of agriculture 3445 0

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उत्तर :
व्याख्या :

The commercialization of agriculture means that the agricultural crops and goods are produced by the peasants for sale in the market and not for their own consumption. Commercialisation of agriculture is a phenomenon where agriculture is governed by commercial consideration i.e. certain specialised crops began to be grown not for consumption in village but for sale in national and even in international market.   Commercialization of agriculture in India began during the British rule.

प्र: Which Payments Bank becoming the first bank to offer cash backs on deposits  ? 3445 0

  • 1
    Postal Payments Bank
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    गलत
  • 2
    Airtel Payments Bank
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    गलत
  • 3
    Aditya Birla Payments Bank
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    गलत
  • 4
    Paytm Payments Bank
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उत्तर : 4. "Paytm Payments Bank"
व्याख्या :

Answer: D) Paytm Payments Bank Explanation: Paytm Payments Bank becoming the first bank to offer cash backs on deposits. Customers will also be offered zero charges on all online transactions and no minimum balance requirement. The Payments Bank plans to roll out 31 branches and 3,000 customer service points in the first year. For savings accounts, it will offer an interest of 4 percent per annum. It will also offer current accounts to its millions of merchants.

प्र: Blotting paper absorbs ink due to 3441 0

  • 1
    Capillary action phenomenon
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  • 2
    Diffusion of ink through the blotting
    सही
    गलत
  • 3
    Siphon action
    सही
    गलत
  • 4
    Viscosity of ink
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    गलत
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उत्तर : 1. "Capillary action phenomenon"
व्याख्या :

Answer: A) Capillary action phenomenon Explanation: Blotting paper absorbs ink by the process of capillary action. The capillary action is based on the property of surface tension of liquid.   All unsized paper will absorb water. Blotting paper is not sized and made bulkier to provide capillary action for faster absorption of liquid.   Blotting paper has also been sold as a cosmetic to aid in the removal of skin oils and makeup.

प्र: The average age of a class is 19 years. While the average age of girls is 18 and that of boys is 21. If the number of girls in the class is 16, Find the number of Boys in the class? 3440 0

  • 1
    12
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  • 2
    10
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  • 3
    8
    सही
    गलत
  • 4
    6
    सही
    गलत
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उत्तर : 3. "8"
व्याख्या :

Answer: C) 8 Explanation: Let the number of boys = x From the given data, => [21x + 16(18)]/(x+16) = 19 => 21x - 19x = 19(16) - 16(18) => 2x = 16 => x = 8 Therefore, the number of boys in the class = 8.

प्र: In an exam, a candidate secured 504 marks out of the maximum mark of 'M'. If the maximum mark 'M' is converted into 800 marks, he would have secured 384 marks. What is the value of 'M' ? 3431 0

  • 1
    910
    सही
    गलत
  • 2
    1000
    सही
    गलत
  • 3
    970
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    गलत
  • 4
    None of the above
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उत्तर : 4. "None of the above"
व्याख्या :

Answer: D) None of the above Explanation: 504/M = 384/800 (504 x 800) / 384 = M M = 1050

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