IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: National Statistics day observed every year on 912 05b5cc632e4d2b4197774b9be
5b5cc632e4d2b4197774b9be- 120 Octoberfalse
- 220 Julyfalse
- 329 Junetrue
- 421 Septemberfalse
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उत्तर : 3. "29 June"
व्याख्या :
Answer: C) 29 June Explanation: National Statistics day is celebrated annually 29th June, on the occasion of Birth anniversary of India’s eminent statistician Late Prof Prasanta Chandra Mahalanobis. It also commemorates the contributions made by PC Mahalanobis in the fields of statistics and economic planning.
प्र: What is the gram formula mass of K2CO3? 1412 05b5cc632e4d2b4197774b9b8
5b5cc632e4d2b4197774b9b8- 1147false
- 2138true
- 3129false
- 4116false
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उत्तर : 2. "138"
व्याख्या :
Answer: B) 138 Explanation: The gram formula mass of a compound is nothing but the molar mass. The molar mass of K2CO3 (Potassium Carbonate) is given by Atomic weights of individual elements are K (Potassium) = 39 g C (Carbon) = 12 g O (Oxygen) = 16 g Hence, that of K2CO3 = 39(2) + 12 + 16(3) = 78 + 12 + 48 = 138.
प्र: Plant cell walls consist mainly of 1174 05b5cc632e4d2b4197774b9b3
5b5cc632e4d2b4197774b9b3- 1Chitinfalse
- 2peptidoglycanfalse
- 3cellulosetrue
- 4chlorophyllfalse
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उत्तर : 3. "cellulose"
व्याख्या :
Answer: C) cellulose Explanation: Plant cell walls are mostly made up of the molecule cellulose. Cellulose is a polysaccharide, a complex sugar made of long chains of glucose. The cell wall must be made of thick and strong material as it provides the structural shape of the plant and protection from insects and microorganisms.
प्र: The main result of aerobic respiration is the 1138 05b5cc632e4d2b4197774b9ae
5b5cc632e4d2b4197774b9ae- 1production of lactic acid as an end productfalse
- 2production of ATP from the breakdown of glucosetrue
- 3conversion of radiant energy into chemical energyfalse
- 4storage of energy in a polysaccharidefalse
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उत्तर : 2. "production of ATP from the breakdown of glucose"
व्याख्या :
Answer: B) production of ATP from the breakdown of glucose Explanation: The three steps within the aerobic respiration process are glycolysis, the citric acid cycle, and oxidative phosphorylation. Photosynthesis builds glucose, and what was built in photosynthesis is broken down during aerobic respiration. Hence, production of ATP from the breakdown of glucose is the main result of aerobic respiration.
प्र: 200 D for P G in M 1246 05b5cc632e4d2b4197774b9a8
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उत्तर :
व्याख्या :
Logically the given letter equation implies that, 200 Dollars for Passing GO in Monopoly.
प्र: 25 : 37 :: 49 : ? 1315 05b5cc632e4d2b4197774b9a9
5b5cc632e4d2b4197774b9a9- 165true
- 269false
- 379false
- 481false
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उत्तर : 1. "65"
व्याख्या :
Answer: A) 65 Explanation: Here the given numbers are related in such a manner that, 52 = 255+12 + 1 = 37Similarly, 72 = 497+12 + 1 = 64 + 1 = 65 Hence, 25 : 37 :: 49 : 65.
प्र: Which alternative energy source is exhaustible? 1329 05b5cc62fe4d2b4197774b9a2
5b5cc62fe4d2b4197774b9a2- 1tidal energyfalse
- 2wind energyfalse
- 3solar energyfalse
- 4geothermal energytrue
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उत्तर : 4. "geothermal energy"
व्याख्या :
Answer: D) geothermal energy Explanation: Based on conventionality in deriving energy, energy sources could be classified as Conventional :: coal, oil, hydro, nuclear, etc... sources which can be used up or exhaustible. (and) Non - conventional :: solar, wind, tidal, geothermal, biogas, etc... sources which are not exhausted. Among the given options, Geothermal energy is the alternative energy source among all the choices that are given in the question, that is exhaustible.
प्र: What two countries have nearly 50% of global coal reserves? 1265 05b5cc62fe4d2b4197774b99d
5b5cc62fe4d2b4197774b99d- 1Iran & USAfalse
- 2USA & Chinafalse
- 3Russia & USAtrue
- 4Brazil & Russiafalse
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उत्तर : 3. "Russia & USA"
व्याख्या :
Answer: C) Russia & USA Explanation: United States and Russia have together almost 400 billion tones. Which represents nearly 50% of world's reserves of coal.