IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: W of H the E? 1907 0

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उत्तर :
व्याख्या :

The given letter equation tells that, Wives of Henry the Eighth.

प्र: If 6 men and 3 boys working together, can do four times as much work per hour as a man and a boy together. Find the ratio of the work done by a man and that of a boy for a given time  ? 1907 0

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

Answer: A) 1 : 2 Explanation: 6M + 3B = 4(1M + 1B)6M + 3B = 4M + 4B2M = 1B M/B = 1/2

प्र: Simplify the following and find the value of ?   13 of ? + 47 of 114 of 539 = 31% of 2000 1906 0

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    1134
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  • 2
    1237
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  • 3
    1187
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  • 4
    1249
    सही
    गलत
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उत्तर : 1. "1134"
व्याख्या :

Answer: A) 1134 Explanation: 13 x ? + 47 x 114 x 539 = 31100 x 2000? = 378 x 3? = 1134

प्र: Which of these molecules are polar? Check all that apply. 1906 0

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    SO2
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  • 2
    CH2Cl2
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  • 3
    PCl3
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  • 4
    All the above
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उत्तर : 4. "All the above"
व्याख्या :

Answer: D) All the above Explanation:    1) SO2                  2) CH2Cl2                3) PCl3 How to check the given molecules are polar or non polar : If the electronegativity of the two bonded atoms are different then the bond is polar. Although, some molecules contain polar bonds, the molecule may be non-polar. If the polarity of all the bonds present in the molecule are cancel each other then molecule is non-polar.   In the given options, SO2  is polar because the dipole moments on the O do not cancel. PCl3  is polar because the P-Cl bonds do not cancel out. CH2Cl2  polar because the C-Cl bonds do not cancel.   Hence, in brief, Polar molecules are molecules with net dipole due to the presence of partial positive and partial negative charge. For example, water is a polar molecule that has partial positive and partial negative charge on it. CO2 is a non polar compound.   Therefore, all the given options SO2, CH2Cl2 and PCl3 are Polar molecules.

प्र: Is Air a Mixture? 1906 0

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    TRUE
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  • 2
    FALSE Answer & Explanation Answer:
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उत्तर : 1. "TRUE"
व्याख्या :

Answer: A) TRUE Explanation: True, Air is a Mixture. Air is considered as mixture for the following reasons ; 1. Air can be separated into its components like N2, O2 , Argon and CO2 by the process of fractional distillation of liquid air. 2. Air shows the properties of all the gases present in the atmosphere. For example : Oxygen is good Supporter of combustion. Hence air also is good supporter of combustion. 3. Air does not have a fixed formula. 4. Air has a variable composition because air at different places contains different amount of gases. 5. Heat or Light energy is neither absorbed nor released when air is prepared physical by mixing required amount of gases . 6. Mixture does have fixed boiling Point. It holds good in case of liquid air.

प्र: When Was The Tripitaka Written 1906 0

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उत्तर :
व्याख्या :

The Tripitaka was Written in Third Century bce(beginning of the common era). The Tripitaka (called Tipitaka in Pali) is the earliest collection of buddhist writings. Initially, they were composed orally.

प्र: The ratio of present ages of X and Y is 4:5. Which of the following can't be the ratio of ages of X and Y, 20 years ago ? 1906 0

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    2 : 5
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  • 2
    8 : 15
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  • 3
    9 : 10
    सही
    गलत
  • 4
    3 : 5
    सही
    गलत
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उत्तर : 3. "9 : 10"
व्याख्या :

Answer: C) 9 : 10 Explanation: The ratio of X and Y ages at present is 4:5.  Then, the ratio 20 years ago will not be more than the ratio at present. So, from the options 9:10 is not satifying => its ratio is 0.9 which is greater than presnt ratio of 0.8.

प्र: What happens during the S-phase of the cell cycle? 1905 0

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    cell division
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  • 2
    cell growth
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  • 3
    DNA replication
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  • 4
    protein and enzyme synthesis
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    गलत
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उत्तर : 3. "DNA replication"
व्याख्या :

Answer: C) DNA replication Explanation: S-phase (synthesis phase) is the part of the cell cycle in which DNA is replicated, occurring between G1 phase and G2 phase. Precise and accurate DNA replication is necessary to prevent genetic abnormalities which often lead to cell death or disease.

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