IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Computer storage units smallest to largest? 2651 0

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उत्तर :
व्याख्या :

The smallest unit of data storage in a computer is called Bit (Binary Digit). Half a byte (four bits) is called a Nibble.   1 bit (binary digit) = the value of 0 or 1 8 bits = 1 byte 1024 bytes = 1 kilobyte 1024 kilobytes = 1 megabyte 1024 megabytes = 1 gigabyte 1024 gigabytes = 1 terabyte 1024 terabytes = 1 petabyte   Hence, Computer storage units smallest to largest i.e, in ascending order is  1 bit  <  1 byte  <  1 KB  <  1 MB  <  1 GB  <  1TB  <  1 PB.

प्र: Fill in the blank with suitable preposition in the following sentence.   ____ the two I prefer tea. 2651 0

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    From
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    गलत
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    In
    सही
    गलत
  • 3
    Between
    सही
    गलत
  • 4
    Among
    सही
    गलत
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उत्तर : 3. "Between"
व्याख्या :

Answer: C) Between Explanation: Between the two I prefer tea is the correct sentence with suitable preposition.

प्र: Which of the following is a Heterogeneous Mixture? 2650 0

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    Air
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    Table salt
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    Soda
    सही
    गलत
  • 4
    Brass
    सही
    गलत
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उत्तर : 3. "Soda"
व्याख्या :

Answer: C) Soda Explanation: Here Soda is a Heterogenous Mixture.   A Heterogeneous Mixture is a mixture having a non-uniform composition i.e, the mixture contains components in different phases. Using various means, the parts in the mixture can be separated from one another.

प्र: What is a product in a chemical reaction? 2649 0

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उत्तर :
व्याख्या :

In chemistry, a product is a substance that is formed as the result of a chemical reaction. In a reaction, starting materials called reactants and the ending materials are called products.

प्र: 'A' sold an article to 'B' at a profit of 20%. 'B' sold the same article to 'C' at a loss of 25% and 'C' sold the same article to 'D' at a profit of 40%. If 'D' paid Rs 252 for the article, then find how much did 'A' pay for it? 2645 0

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    Rs.196
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  • 2
    Rs.210
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  • 3
    Rs.200
    सही
    गलत
  • 4
    Rs.235
    सही
    गलत
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उत्तर : 3. "Rs.200"
व्याख्या :

Answer: C) Rs.200 Explanation: Let the article costs 'X' to ACost price of B = 1.2XCost price of C = 0.75(1.2X) = 0.9XCost price of D = 1.4(0.9X) = 1.26X = 252Amount paid by A for the article = Rs. 200.

प्र: Which of the following is the strongest base? 2642 0

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    LiCH3
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  • 2
    LiF
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  • 3
    LiOH
    सही
    गलत
  • 4
    LiNH2
    सही
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उत्तर : 1. "LiCH3"
व्याख्या :

Answer: A) LiCH3 Explanation: The stability of the ions is determined by the energy of the lone pairs. Carbon has the least effective nuclear charge (Zeff) and so the lone pair on the CH3− ion has the highest energy, making it the least stable ion and so the strongest base. The Zeff increases as we move across the period until we get to fluorine which has the greatest Zeff and so its lone pairs have the lowest energy, making F− the least basic ion.   In order of decreasing basicity they are ranked LiCH3 > LiNH2 > LiOH > LiF. We are dealing with the ions F−, OH−, NH2− and CH3− and so the factor which influences their basicity is the stability of the ion compared to its conjugate acid.

प्र: What is the term used in tennis when the score is 40-40? 2641 0

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    Ace
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  • 2
    Led
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    Deuce
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  • 4
    Tie
    सही
    गलत
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उत्तर : 3. "Deuce"
व्याख्या :

Answer: C) Deuce Explanation: When both sides have won the same number of points then: when each side has won one, or two, points, the score is described as "15-all" and "30-all" (or "15-up" and "30-up"), respectively. However, if each player has won three points, the score is called as "deuce", not "40–all". From that point on in the game, whenever the score is tied, it is described as "deuce", regardless of how many points have been played.

प्र: If two fractions, each of which has a value between 0 and 1, are multiplied together, the product will be : 2641 0

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    always greater than either of the original fractions
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  • 2
    always less than either of the original fractions
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  • 3
    sometimes greater and sometimes less than either of the original fractions
    सही
    गलत
  • 4
    remains the same
    सही
    गलत
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उत्तर : 2. "always less than either of the original fractions"
व्याख्या :

Answer: B) always less than either of the original fractions Explanation: We can easily Answer this by taking some values.   The question states that the two fractions, each have values between 0 and 1.Let us say one of the fraction is 1/2 and the other fraction is 1/3 .The product of the two fractions is 1/2 x 1/3 = 1/6 . is lesser than both 1/2  and 1/3 .So, the correct answer is that the product is always less than either of the original fractions.

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