IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Who has sworn in as 45th Chief Justice of India  ? 1264 0

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    Dipak Misra
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  • 2
    J S Khehar
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  • 3
    T. S. Thakur
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  • 4
    Ranganath Misra
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उत्तर : 1. "Dipak Misra"
व्याख्या :

Answer: A) Dipak Misra Explanation:

प्र: If two dice are thrown together, the probability of getting an even number on one die and an odd number on the other is  ? 1264 0

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    1
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  • 2
    1/2
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  • 3
    0
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  • 4
    3/5
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उत्तर : 2. "1/2"
व्याख्या :

Answer: B) 1/2 Explanation: The number of exhaustive outcomes is 36.Let E be the event of getting an even number on one die and an odd number on the other. Let the event of getting either both even or both odd then = 18/36 = 1/2P(E) = 1 - 1/2 = 1/2.

प्र: Why is burning coal a major source of pollution? 1264 0

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उत्तर :
व्याख्या :

Coal is chemically complex fuel. Whenever it is burned, gases are given off and particles of ash, called "fly ash," are released. Release of sulfur from burning into the air. The sulfur in coal combines with oxygen to form sulfur dioxide, which can be a major source of air pollution if emitted in large enough quantities. This stuff comes back as acid rain when it attaches itself to a raindrop.    Today, many of the effects of coal burning have been reduced significantly or eliminated. This is super-nasty and is only stopped by buying low-sulfur coal from Montana or Wyoming. The eastern power plants have to pay to move the coal from out west and this increases the price of power production.

प्र: Which one of the following elements is a transition element? 1263 0

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    H
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  • 2
    As
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  • 3
    Fe
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  • 4
    Sr
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उत्तर : 3. "Fe"
व्याख्या :

Answer: C) Fe Explanation: In chemistry, the term transition metal has three possible meanings: The IUPAC definition defines a transition metal as "an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell". Any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g. iron, manganese, chromium, and copper. Chemically they show variable valency and a strong tendency to form coordination compounds, and many of their compounds are coloured.   Here in the given options, only iron (Fe) is a transition metal since Strontium is an alkaline earth, arsenic is a metalloid, hydrogen is (normally) a diatomic gas.

प्र: 36 identical books must be arranged in rows with the same number of books in each row. Each row must contain at least three books and there must be at least three rows. A row is parallel to the front of the room. How many different arrangements are possible ? 1263 0

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    5
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  • 2
    6
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  • 3
    7
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  • 4
    8
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उत्तर : 1. "5"
व्याख्या :

Answer: A) 5 Explanation: The following arrangements satisfy all 3 conditions. Arrangement 1: 3 books in a row; 12 rows. Arrangement 2: 4 books in a row; 9 rows.Arrangement 3: 6 books in a row; 6 rows.Arrangement 4: 9 books in a row; 4 rows.Arrangement 5: 12 books in a row; 3 rows.   Therefore, the possible arrangements are 5.

प्र: What is something you will never see again? 1263 0

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उत्तर :
व्याख्या :

Yesterday, is what we will never see again as the time we come across will never be back.

प्र: 9th BRICS summit was held in ___________ ? 1262 0

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    Beijing
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  • 2
    Shangai
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  • 3
    Xiamen
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  • 4
    Chengdu
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उत्तर : 3. "Xiamen"
व्याख्या :

Answer: C) Xiamen Explanation: 9th BRICS summit was held in Xiamen, China with the theme "BRICS: Stronger Partnership for a Brighter Future".

प्र: Which among the following has ranked top Brand among Global 500 Brands in 2017 ? 1262 0

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    Apple
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  • 2
    Amazon
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  • 3
    Google
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    Facebook
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उत्तर : 3. "Google"
व्याख्या :

Answer: C) Google Explanation: 1. In the latest Global 500 rankings of most valuable and powerful brands across the globe, Sundar Pichai’s Google has surpassed Apple to achieve the top position.2. The Brand Finance Global 500 list published on February 2, 2017 had featured Apple as the top brand for continuous five years.3. However, for 2017, the ranking revealed that Google’s brand value rose by 24 percent to $109.5bn in 2016. The brand value of Apple on the other hand dropped 27 percent to $107bn.4. This is for the first time since 2011 that Google has been placed at the top spot. The third place has been occupied by Amazon.5. The ranking is based upon factors such as marketing investment, familiarity, loyalty, staff satisfaction and corporate reputation.

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