IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: There is a clock which shows false timing ie it shows 20 minutes less for each 1 hour. If the clock shows 12 noon now how many minutes will be lost when it shows 2 pm ? 1732 0

  • 1
    36 minutes
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  • 2
    48 minutes
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  • 3
    35 minutes
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  • 4
    60 minutes
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उत्तर : 4. "60 minutes"
व्याख्या :

Answer: D) 60 minutes Explanation: For 1 hour, 20 minutes is slower, then for 06 miuntes - 2 minutes is slower30 minutes - 10 minutesActual time | false time 12 12 01 PM 12:40 PM (20 minutes slower) 02 PM 01:20 PM 03 PM 02:00 PM So, when actual time is 3pm, the false time is 2 pm.So, it loses 60 minutes when it shows 2 pm.

प्र: Which of the following is a Decomposition Reaction? 1732 0

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    2HgO ----> 2Hg + O2
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  • 2
    6NaNO3 ----> 6NaNO2 + 3O2
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  • 3
    ZnCO3 ----> ZnO + CO2
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  • 4
    All the above
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उत्तर : 4. "All the above"
व्याख्या :

Answer: D) All the above Explanation: All the given reactions are Decomposition reactions. Decomposition reaction is a reaction in which only one reactant is splitted into two or more products.

प्र: What is the difference in the shares of profit between P and Q in a joint business at the end of one year ? a. P Invested Rs. 80,000 and withdrew Rs. 20,000 after 6 months. b. Q joined four months after the start of business. c. Q's amount was 80% of P's amount during the last six months. 1731 0

  • 1
    Only a
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  • 2
    Only c
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  • 3
    Both a & b
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  • 4
    Data is not sufficient
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उत्तर : 4. "Data is not sufficient"
व्याख्या :

Answer: D) Data is not sufficient Explanation: a. P's investment = (80000 x 6 + 60000 x 6) = 840000 for 1 month. b & c. Q's investment = 80% of Rs. 60000 for 8 months. = Rs.(48000 x 8) for 1 month = 384000 for 1 month P : Q = 840000 : 384000 = 35 : 16. But, the total profit is not given, so data is inadequate.

प्र: Name the state assembly, which has passed an amendment bill awarding death penalty for convicts involved in the rape of girls below 12 years of age. 1731 0

  • 1
    Rajasthan Assembly
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  • 2
    Uttar Pradesh Assembly
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  • 3
    Maharashtra Assembly
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  • 4
    Bihar Assembly
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उत्तर : 1. "Rajasthan Assembly"
व्याख्या :

Answer: A) Rajasthan Assembly Explanation: Rajasthan assembly has passed an amendment bill awarding death penalty for convicts involved in the rape of girls below 12 years of age. State Home Minister Gulab Chand Kataria introduced 'The Criminal Laws (Rajasthan Amendment) Bill, 2018' in the assembly, which was passed in the House by a voice vote following a debate.

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उत्तर : 3. "Only b follows"
व्याख्या :

Answer: C) Only b follows Explanation: Clearly, reducing the number of aspirants for admission to colleges or sending the students of well-to-do families to foreign countries for higher studies, is no proper solution. So, both I and III do not follow. The right solution is to increase the number of colleges so as t accommodate the increasing number of admission-seekers. So, only II follows.

प्र: What is the oxidation number of carbon in NaHCO3? 1731 0

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    -4
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  • 2
    -3
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  • 3
    +4
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  • 4
    +2
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उत्तर : 3. "+4"
व्याख्या :

Answer: C) +4 Explanation: The given compound is NaHCO3 Sodium bicarbonate which is commonly known as Baking soda. Oxidation numbers are the charges on ions. When a neutral atom loses electrons it becomes positively charged. When a neutral atom gains electrons it becomes negatively charged.   Here the C represents the oxidation state of carbon in this compound. Compounds are electrically neutral, which is why we set the sum of the oxidation states equal to zero. Sodium has a +1 oxidation state. Hydrogen has a +1 oxidation state. Oxygen has a -2 oxidation state. There are three oxygen atoms, which means the total oxidation state provided by both oxygen ions is -6. Adding up these oxidation states we get: 1 + 1 + (-6) + C = 0 -4 + C = 0 => C = 4 This means the oxidation state of carbon in this compound is +4.

प्र: What is true about personal financial planning? 1731 0

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    Personal financial planning is the process of creating and achieving financial goals
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  • 2
    Our financial decisions decrease once we reach adulthood
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  • 3
    A family's resources are unlimited
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  • 4
    There are two means for achieving financial goals—you either need to increase your spending or reduce savings
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उत्तर : 1. "Personal financial planning is the process of creating and achieving financial goals"
व्याख्या :

Answer: A) Personal financial planning is the process of creating and achieving financial goals Explanation: Personal financial planning is the process of creating and achieving financial goals.   True statements regarding personal financial planning: As we age, the number and complexity of the financial decisions that we make increases. There are two means for achieving financial goals—you either need to increase your savings or reduce spending. A family's resources are limited.

प्र: Which planet has maximum satellite? 1730 0

  • 1
    Saturn
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  • 2
    Earth
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  • 3
    Jupiter
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  • 4
    Mars
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उत्तर : 3. "Jupiter"
व्याख्या :

Answer: C) Jupiter Explanation: Jupiter has 67 natural satellites. Eight of Jupiter's moons are regular satellites, with 4 large, spherical moons, and 4 smaller moons that orbit closer to Jupiter. Jupiter has an additional 55 tiny irregular satellites.   The planet with the second highest number of moons is Saturn, with 61 moons. Earth has only one natural satellite i.e, Moon. Mercury and Venus have no satellites.

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