IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: If in an A.P series 18th term is 29 and 29th term is 18. Then find the 49th term ? 1554 0

  • 1
    -3
    सही
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  • 2
    -2
    सही
    गलत
  • 3
    0
    सही
    गलत
  • 4
    1
    सही
    गलत
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उत्तर : 2. "-2"
व्याख्या :

Answer: B) -2 Explanation: We know that in A.P series18th term = a + 17d29th term = a + 28dBut given a + 17d = 29..........(i)a + 28d = 18......... (ii)Solving equation (i) and (ii), we getd = -1put d = -1 in any of the above equations and we get, a = 46Now, we know 49th term can be written as, a + 48d putting the value of a and d in the above equation,a + 48d = 46 + 48(-1) = 46 - 48 = -2 Hence, the 49th term is -2.

प्र: Standing on a platform, Rajan told Kumar that Varanasi was more than 20 km but less than 25 km from there. Kumar knew that it was more than 18 km but less than 22 km from there. If both of them are correct, then which of the following is the true distance of Varanasi from the platform ? 1554 0

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    20 km
    सही
    गलत
  • 2
    22 km
    सही
    गलत
  • 3
    19 km
    सही
    गलत
  • 4
    21 km
    सही
    गलत
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उत्तर : 4. "21 km"
व्याख्या :

Answer: D) 21 km Explanation: From both voices it can be conclude that, Varanasi is more than 20km but less than 22km away. That is it is 21 kms away.

प्र: A man sell 35 waffers for Rs. 15 each and loses Rs. 40.4. If he sells 35 waffers for Rs. 18, how much does he loss or gain ? 1554 1

  • 1
    Rs. 64
    सही
    गलत
  • 2
    Rs. 52
    सही
    गलत
  • 3
    Rs. 72
    सही
    गलत
  • 4
    Rs. 55
    सही
    गलत
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उत्तर : 1. "Rs. 64"
व्याख्या :

Answer: A) Rs. 64 Explanation: Given Loss = Rs. 40.4We know loss = cost price - selling price 40.4 = CP - 35(15)=> CP = 40.4 + 525=> CP = Rs. 565.4Now the New selling price of waffer is Rs. 18=> SP = 35(18) = 630Now Gain = SP - CP = 630 -565.4 = Rs. 64.6.

प्र: Capitalism is characterized by which of the following? 1554 0

  • 1
    Profits
    सही
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  • 2
    A market economy
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  • 3
    Privately owned businesses
    सही
    गलत
  • 4
    All the above
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उत्तर : 4. "All the above"
व्याख्या :

Answer: D) All the above Explanation: Capitalism is an economic system followed by a country or a society which is characterized by Privately owned businesses, a market economy and profits. Capitalism is defined as "production for exchange" driven by the desire for personal accumulation of money receipts in such exchanges, mediated by free markets. The markets themselves are driven by the needs and wants of consumers and those of society as a whole in the form of the bourgeois state.

प्र: c with a line over it symbol means 1553 0

  • 1
    with
    सही
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  • 2
    without
    सही
    गलत
  • 3
    and
    सही
    गलत
  • 4
    or
    सही
    गलत
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उत्तर : 1. "with"
व्याख्या :

Answer: A) with Explanation: The letter “c” with a line over it is a medical abbreviation often used by doctors, nurses, and other medical professionals. The symbol looks like this: c̄. The c is almost always lower-case. This symbol actually has a very simple meaning. A c with a line over it just means “with”. This abbreviation is often used on patient charts and prescriptions, as well as information or notes written by medical professionals.

प्र: What is a Common Multiple? 1553 0

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उत्तर :
व्याख्या :

If the Multiples for two or more numbers which are Common, then those Multiples are said to be Common Multiples.    For Example : Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30,... Multiples of 5 are 5, 10, 15, 20, 25, 30,... Here common multiples of 3 & 5 upto 30 are 15, 30.

प्र: Social Rights will not include _____ of the following? 1553 0

  • 1
    Adivasi
    सही
    गलत
  • 2
    Women
    सही
    गलत
  • 3
    Care for Political Section
    सही
    गलत
  • 4
    Children
    सही
    गलत
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उत्तर : 3. "Care for Political Section"
व्याख्या :

Answer: C) Care for Political Section Explanation:

प्र: Blood group compatibility for marriage? 1552 0

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उत्तर :
व्याख्या :

Matching blood group before marriage is important. This is to prevent Rh incompatibility. Rh incompatibility can lead to erythroblastosis fetalis (Hemolytic disease of the newborn-HDN). Fetal RBC gets destroyed & newborn may get severe anaemia, jaundice. This jaundice is more severe than Physiological jaundice ( which is the most common and will usually resolve on its own).   In very severe form, a fetus may die due to heart failure. This is mediated by the antigen-antibodies reaction. Transfer of maternal antibodies across the placenta occurs. This happens when Rh +ve man marries Rh-ve lady.    So Rh +ve man should try to avoid marrying Rh-ve lady.   Matching blood groups for marriage :: Boy : A = Girl : A & AB  Boy : B = Girl : B & AB  Boy : O = Girl : O, A, B & AB  Boy : AB = Girl : AB  Boy : Rh+ve = Girl : Rh+ve  Boy : Rh-ve = Girl : Rh+ve & Rh-ve.    Blood groups that do not match for marriage :: Boy : A = Girl : O & B  Boy : B = Girl : O & A  Boy : AB = Girl : O, A & B  Boy : Rh+ve = Girl : Rh-ve.

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