IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Okhla Bird Sanctuary is located in 2095 0

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    Rajasthan
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    West Bengal
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    Maharashtra
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    Uttar Pradesh
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उत्तर : 4. "Uttar Pradesh"
व्याख्या :

Answer: D) Uttar Pradesh Explanation: Okhla Bird Sanctuary is located in Uttar Pradesh. Okhla Bird Sanctuary is a bird sanctuary at the Okhla barrage over Yamuna River. It is situated in Noida, Gautam Buddh Nagar district, on Delhi-Uttar Pradesh state border and known as a haven for over 300 bird species.

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उत्तर :
व्याख्या :

Answer 1) dRashmi is the daughter of Amit who is son of Veena.Therefore, Veena is Grand mother of Rashmi. Answer 2) bVandana's sister is Vishal's brother's wife.Therfore, Vishal is Vandana's Brother-in-law. Answer 3) cYashwanth is son of Avinash who is the son of Rohit Agarwal.Therefore, surname of Yashwanth is Agarwal.

प्र: Solve the Riddle? 2094 0

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    79 hrs
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    72 hrs
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    52 hrs
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    18 hrs
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उत्तर : 4. "18 hrs"
व्याख्या :

Answer: D) 18 hrs Explanation: From the given data, 18 snakes can eat 18 bananas in 18 hrs. => 1 snake can eat 1 banana in 18 hrs => 79 snakes can eat 79 bananas in 18 hrs.   Hence, 18 hrs.

प्र: Who discovered the monomers of nucleic acids? 2094 0

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    James Watson, Francis Crick, and Rosalind Franklin
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    Friedrich Miescher
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    Phoebus Levene
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    Gerardus Johannes Mulder and Jöns Jacob Berxelius
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उत्तर : 3. "Phoebus Levene"
व्याख्या :

Answer: C) Phoebus Levene Explanation: Deoxyribonucleic acid (DNA) is a nucleic acid polymer composed of monomers called nucleotides. Nucleotides are composed of three components: (1) a pentose sugar; (2) a nitrogenous base; and (3) one to three phosphate groups. Phoebus Levene, a Russian biochemist was the first to discover the nucleotide and the first to correctly identify the way nucleic acid molecules, DNA.

प्र: When during the Cell Cycle are Chromosomes visible? 2094 0

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    only during interphase
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    only during cell division
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    only during G1 phase
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    only during they are replicated
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उत्तर : 2. "only during cell division"
व्याख्या :

Answer: B) only during cell division Explanation: During most of the cell cycle, interphase, the chromosomes are somewhat less condensed and are not visible as individual objects under the light microscope. However during cell division, mitosis, the chromosomes become highly condensed and are then visible as dark distinct bodies within the nuclei of cells. The chromosomes are most easily seen and identified at the metaphase stage of cell division and most of the chromosome images in this gallery are pictures of metaphase chromomosomes. The cell division takes place in mitosis stage.

प्र: A substance that cannot be broken down into simpler substances 2093 0

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    Heterogenous mixure
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    Compound
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    Homogenous mixture
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    Element
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उत्तर : 4. "Element"
व्याख्या :

Answer: D) Element Explanation: A substance that cannot be decomposed (broken down) into simpler substances by ordinary chemical means. Examples: gold, iron, carbon, hydrogen, oxygen, nitrogen. Material composed of only one kind of matter throughout (same atoms or same molecules).

प्र: If sum of upstream and downstream speed of a boat is 82 kmph, and the boat travels 105 km. upstream in 3 hr, Find the time taken by boat to cover 126 km downstream. 2093 0

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    2.8 hrs
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    2.7 hrs
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    2.6 hrs
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    2.5 hrs
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उत्तर : 2. "2.7 hrs"
व्याख्या :

Answer: B) 2.7 hrs Explanation: Let Speed of boat in still water = b Let Speed of still water = w Then we know that, Speed of Upstream = U = boat - water Speed of Downstream = D = boat + water Given, U + D = 82 b - w + b + w = 82 2b = 82 => b = 41 kmph From the given data, 41 - w = 105/3 = 35 w = 6 kmph Now, b + w = 126/t => 41 + 6 = 126/t => t = 126/47  = 2.68 hrs.

प्र: In which year was the Supreme Court of India established? 2092 0

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    1951
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    1949
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    1950
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    1947
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उत्तर : 3. "1950"
व्याख्या :

Answer: C) 1950 Explanation: The Supreme Court of India was established in the year 1950.

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