IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Consent of the People means 1308 0

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    All the People
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    Majority of People
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    Leader of the People
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  • 4
    A few People
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उत्तर : 2. "Majority of People"
व्याख्या :

Answer: B) Majority of People Explanation: Consent of the People means the Majority of People, as expressed by votes in elections. Consent of the governed refers to the idea that a government's legitimacy and moral right to use state power is only justified and lawful when consented to by the people or society over which that political power is exercised.

प्र: The wavelength of a wave is the distance between 1280 0

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    Crest and Trough
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    Crest and Crest
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    Trough and Trough
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    Both B & C
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उत्तर : 4. "Both B & C"
व्याख्या :

Answer: D) Both B & C Explanation: Distance between two Consecutive Crests or two Consecutive Troughs is called Wavelength. But the distance between crest and adjacent trough is half the wavelength. That is the distance between adjacent crest and trough is called Half the wavelength.

प्र: Who Discovered The Nucleus of a Cell? 1246 0

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    Otto Hahn
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    John Dalton
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    Robert Brown
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    Marie Curie
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उत्तर : 3. "Robert Brown"
व्याख्या :

Answer: C) Robert Brown Explanation: Robert Brown, Scottish botanist, Discovered The Nucleus of a Cell in 1831, London. When Brown was studying orchids under microscope when he observed an opaque area, which he called the "Areola" or "Nucleus", in the cells of the flower's outer layer. The nucleus was also described by Franz Bauer in 1804 but in detail Robert Brown made it in 1831.

प्र: Which of these is Not a Carcinogen? 1584 0

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    Cadmium
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    Asbestos
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    Benzene
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    All the above
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उत्तर : 4. "All the above"
व्याख्या :

Answer: D) All the above Explanation: Asbestos can cause  Lungs Gastrointestinal tract  types of Cancer. Benzene can cause Leukemia Hodgkin's lymphoma types of Cancer. Cadmium can cause Prostate type of Cancer.

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. 2002 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: The difference between simple interest and compound interest of a certain sum of money at 20% per annum for 2 years is Rs. 56. Then the sum is : 1669 0

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    Rs. 3680
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    Rs. 2650
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    Rs. 1400
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    Rs. 1170
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उत्तर : 3. "Rs. 1400"
व्याख्या :

Answer: C) Rs. 1400 Explanation: We know thatThe Difference between Compound Interest and Simple Interest for n years at R rate of interest is given by C.In - S.In = PR100n Here n = 2 years, R = 20%, C.I - S.I = 56 56 = P201002=> P = 56 x 52=> P = 56 x 25=> P = Rs. 1400

प्र: What are the Monomers that make up Proteins? 1284 0

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    Amino acids
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    Nucleotides
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    Disaccharides
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    Chaperones
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उत्तर : 1. "Amino acids"
व्याख्या :

Answer: A) Amino acids Explanation: Proteins are long chains of Amino acids. That is in brief, Amino acids are the monomers of Proteins. Amino acids are compounds which contain both an amino group and a carboxylic group. Proteins are made up of 20 essential amino acids. Monomer means a small molecule of an organic substance i.e, building block in general.

प्र: How many Species go Extinct Every Day? 1827 0

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उत्तर :
व्याख्या :

About 150 - 200 species of plant, insect, bird and mammal become extinct every day or 24 hrs. This is not an accurate but an estimation by U.N. Convention on Biological Diversity and Global Extinction Rates. It is also said that current extinctions were 'up to 100 times higher than the background rate.'

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