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#1
27th October 2016, 09:48 AM
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 Polytechnic Entrance Exam Previous Question Papers   |
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#2
27th October 2016, 10:26 AM
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| Re: Polytechnic Entrance Exam Previous Question Papers
As you want I am here giving you previous year question papers for Polytechnic Entrance Exam. Polytechnic Entrance Exam Question Papers: Ques. 1: The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of Acyl chloride > Ester > Acid anhydride > Amide Acyl chloride > Acid anhydride > Ester > Amide Ester > Acyl chloride > Amide > Acid anhydride Acid anhydride > Amide > Ester > Acyl chloride Answer: 2 Ques. 2: How many stereoisomers does the molecules have? CH3CH = CHCH2CHBrCH3 2 4 6 8 Answer: 2 Ques. 3: The number of d-electrons in Fe2+ (Z = 26) is not equal to that of p-electrons in Ne(Z = 10) s-electrons in Mg(Z = 12) d-electrons in Fe(Z = 26) p-electrons in CI(Z = 17) Answer: 4 Ques. 4: Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to the heating effect of current alone hysteresis loss alone both the heating effect of current and hysteresis loss intense sunlight at noon Answer: 3 Ques. 5: which one of the following elements silicon should be doped so as to give p type of semiconductor? Boron Germanium Arsenic Selenium Answer: 1 Ques. 6: Which one of the following arrangements does not give the correct picture of the trends indicated against it? F2 > Cl2 > Br2 > I2: Electronegativity F2 > Cl2 > Br2 > I2: Oxidizing power F2 > Cl2 > Br2 > I2: Electron gain enthalpy F2 > Cl2 > Br2 > I2: Bond dissociation energy Answer: 4 Ques. 7: Number of moles of MnO4- required to oxidize one mole of ferrous oxalate completely in acidic medium will be 2 moles 6 moles 4 moles 5 moles Answer: 2 Ques. 8: Radiocarbon is produced in the atmosphere as a result of collision between fast neutrons and nitrogen nuclei present in the atmosphere action of ultraviolet light from the sun on atmospheric oxygen action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere lightning discharge in atmosphere Answer: 1 Ques. 9: Nuclear sizes are expressed in a unit named Fermi angstrom newton tesla Answer: 1 Ques. 10: Lux is the SI unit of intensity of illumination luminous efficiency luminous flux luminous intensity Answer: 1 Ques. 11: Point A is at a lower electrical potential than point B. An electron between them on the line joining them will move towards A move towards B move at right angles to the line joining A and B remain at rest Answer: 2 Ques. 12: The high reactivity of fluorine is due to its high electro negativity small size of fluorine atom availability of d-orbitals strong F – F bond Answer: 1 Ques. 13: The iron ore magnetite consists of Fe2O3 Fe3OH4 FeCO3 . 3H2O Answer: 1 Ques. 14: The main chemical constituent of clay is silicon oxide aluminium borosilicate zeolites aluminium silicate Answer: 4 Ques. 15: The main use of salt in the diet is to make the taste of food better produce in small amounts the hydrochloric acid required for the digestion of food ease the process of cooking increase the solubility of food particles in water Answer: 2 Ques. 16: In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant, approximately what percentage of the selling price is the profit? 30% 70% 100% 250% Answer: 2 Ques. 16: In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant, approximately what percentage of the selling price is the profit? 30% 70% 100% 250% Answer: 2 Ques. 20: A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is 500 5 014 002 Answer: 4 |
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