Railway Board offers opulent and revered job posts to its aspirants. And it is not every year that we get the notification from Railway offering a good number of vacant seats to the multitude aspirants. But the current year 2018 brought a pleasant surprise with almost 1,20,000 seats to be filled by the valid candidates. Opportunity is here but you have to welcome it with a provident strategy.
रेलवे बोर्ड अपने उम्मीदवारों के लिए भव्य और प्रतिष्ठित कार्य पदों की पेशकश करता है. और हर साल ऐसा नहीं होता है कि हमें रेलवे की ओर से अधिसूचना मिलती है. लेकिन वर्तमान वर्ष 2018 आपके लिए बहुत सुखद वर्ष है क्योंकि इसमें लगभग 1,20,000 सीटों को वैध उम्मीदवारों द्वारा भरा जाएगा. आपके पास बहुत अच्छा अवसर है और आपको इसे एक बेहतर रणनीति से प्राप्त करना होगा.
Q1. Baryllium Sulphate is less soluble in water due to
बेरेलियम सल्फेट किस वजह से पानी में कम घुलनशील है?
(a) High inflammable energy / उच्च ज्वलनशील ऊर्जा
(b) Low Energy of dissociation / विघटन की कम ऊर्जा
(c) Low inflammable energy / कम ज्वलनशील ऊर्जा
(d) Lonic band / लोनिक बैंड
Ans.(a)
Sol. Baryllium Sulphate is less soluble in water due to High inflammable energy.
Sol. Baryllium Sulphate is less soluble in water due to High inflammable energy.
Q2. What is the name of that system, which uses radioactivity to decide the period of materials of-pre-his- toric period?
उस प्रणाली का नाम क्या है, जो प्रागैतिहासिक अवधि की सामग्री की अवधि तय करने के लिए रेडियोधर्मिता का उपयोग करता है?
(a) Radium dating / रेडियम डेटिंग
(b) Uranium dating / यूरेनियम डेटिंग
(c) Carbon dating / कार्बन डेटिंग
(d) Deuterium dating / ड्यूटेरियम डेटिंग
Show Answer
Ans.(c)
Sol. Radiocarbon dating is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years.
Q3. Cement is made hard with Sol. Radiocarbon dating is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years.
सीमेंट को कठोर किस से बनाया जाता है?
(a) Dehydration / निर्जलीकरण
(b) Hydration and dissociation of water / पानी की हाइड्रेशन और विघटन
(c) Dissociation of water / पानी का विघटन
(d) Polymerisation / पॉलीमेराईजेशन
Show Answer
Ans.(b)
Sol. Cements harden because of hydration, chemical reactions that occur independently of the mixture’s water content; they can harden even underwater or when constantly exposed to wet weather. The chemical reaction that result when the anhydrous cement powder is mixed with water produces hydrates that are not water-soluble.
Sol. Cements harden because of hydration, chemical reactions that occur independently of the mixture’s water content; they can harden even underwater or when constantly exposed to wet weather. The chemical reaction that result when the anhydrous cement powder is mixed with water produces hydrates that are not water-soluble.
Q4. What happens when a chemical bond is formed?
जब एक रासायनिक बोंड बनता है तो क्या होता है?
(a) Energy is always absorbed / ऊर्जा हमेशा अवशोषित होती है
(b) Energy in always released /ऊर्जा हमेशा जारी होती है
(c) Less energy is released than is absorbed / अवशोषित ऊर्जा से कम ऊर्जा जारी की जाती है
(d) Energy is neither released nor absorbed / ऊर्जा न तो जारी की जाती है और न ही अवशोषित होती है
Show Answer
Ans.(b)
Sol. If a bond is broken, energy is absorbed and if a bond is formed, energy must have been released.
Sol. If a bond is broken, energy is absorbed and if a bond is formed, energy must have been released.
Q5. Which among the following is a carbohydrate?
निम्नलिखित में से कौन सा कार्बोहाइड्रेट है?
(a) Nylon / नायलॉन
(b) Cane-sugar / गन्ना
(c) Turpentine / तारपीन
(d) Hydrogen peroxide / हाइड्रोजन पेरोक्साइड
Show Answer
Ans.(b)
Sol. Cane-sugar is carbohydrate and as this name implies, is composed of carbon, hydrogen and oxygen. It is a source of extracting sugar.
Sol. Cane-sugar is carbohydrate and as this name implies, is composed of carbon, hydrogen and oxygen. It is a source of extracting sugar.
Q6. The softest mineral, Talc (Soapstone) is mainly:
सबसे नरम खनिज, टैल्क (साबुन) मुख्य रूप से क्या है?
(a) Manganese Silicate / मैंगनीज सिलिकेट
(b) Sodium Silicate / सोडियम सिलिकेट
(c) Sodium Phosphate / सोडियम फॉस्फेट
(d) Magnesium Silicate / मैग्नीशियम सिलिकेट
Show Answer
Ans.(d)
Sol. Talc is a mineral which is composed of hydrated Magnesium silicate formula Mg_3 Si_4 O_10 (OH)_2.
Sol. Talc is a mineral which is composed of hydrated Magnesium silicate formula Mg_3 Si_4 O_10 (OH)_2.
Q7. To make the steel hard requires increase in-
स्टील को कठोर बनाने के लिए इसमें किस की वृद्धि की आवश्यकता है?
(a) The quantity of Carbon / कार्बन की मात्रा
(b) The quantity of Manganese / मैंगनीज की मात्रा
(c) The quantity of Silicon / सिलिकॉन की मात्रा
(d) The quantity of Chromium / क्रोमियम की मात्रा
स्टील को कठोर बनाने के लिए इसमें किस की वृद्धि की आवश्यकता है?
(a) The quantity of Carbon / कार्बन की मात्रा
(b) The quantity of Manganese / मैंगनीज की मात्रा
(c) The quantity of Silicon / सिलिकॉन की मात्रा
(d) The quantity of Chromium / क्रोमियम की मात्रा
Show Answer
Ans.(a)
Sol. Steels are alloys of Iron and other elements primarily Carbon and are widely used in construction and other area. Carbon inclusion in Iron as a hardening agent which strengthens Iron by distorting its crystal lattice. This distortion result in hardening.
Sol. Steels are alloys of Iron and other elements primarily Carbon and are widely used in construction and other area. Carbon inclusion in Iron as a hardening agent which strengthens Iron by distorting its crystal lattice. This distortion result in hardening.
Q8. The highest amount of Carbon is in-
कार्बन की उच्चतम मात्रा किस में होती है?
(a) Pig Iron / ढलवाँ लोहा
(b) Wrought Iron / गढ़ा लोहा
(c) Steel / इस्पात
(d) Alloy Steel / मिश्र इस्पात
कार्बन की उच्चतम मात्रा किस में होती है?
(a) Pig Iron / ढलवाँ लोहा
(b) Wrought Iron / गढ़ा लोहा
(c) Steel / इस्पात
(d) Alloy Steel / मिश्र इस्पात
Show Answer
Ans.(a)
Sol. Pig Iron has a very high Carbon content, typically 3.5–4.5%. Wrought Iron is an Iron alloy with a very low Carbon (less than 0.08%) content. Steels containing 0.2% to 1.5% Carbon are known as Carbon steel. The amount of Carbon in alloy steel ranges from 0.1% to 1%.
Sol. Pig Iron has a very high Carbon content, typically 3.5–4.5%. Wrought Iron is an Iron alloy with a very low Carbon (less than 0.08%) content. Steels containing 0.2% to 1.5% Carbon are known as Carbon steel. The amount of Carbon in alloy steel ranges from 0.1% to 1%.
Q9. Which of the following is not in the form of crystal?
निम्नलिखित में से कौन सा क्रिस्टल का रूप नहीं है?
(a) Diamond / हीरा
(b) Quartz / क्वार्ट्ज
(c) Sulphur / सल्फर
(d) Graphite / ग्रेफाइट
निम्नलिखित में से कौन सा क्रिस्टल का रूप नहीं है?
(a) Diamond / हीरा
(b) Quartz / क्वार्ट्ज
(c) Sulphur / सल्फर
(d) Graphite / ग्रेफाइट
Show Answer
Ans.(c)
Sol. Salt, Sugar, Diamond, Quartz. Ice, Graphite etc. are in the formed crystal but Sulphur is not. It is a multivalent nonmetallic chemical element.
Sol. Salt, Sugar, Diamond, Quartz. Ice, Graphite etc. are in the formed crystal but Sulphur is not. It is a multivalent nonmetallic chemical element.
Q10. Burning of Hydrogen produces-
हाइड्रोजन के जलने पर क्या उत्पन्न होता है?
(a) Oxygen / ऑक्सीजन
(b) Ash / राख
(c) Soil / मिट्टी
(d) Water / पानी
हाइड्रोजन के जलने पर क्या उत्पन्न होता है?
(a) Oxygen / ऑक्सीजन
(b) Ash / राख
(c) Soil / मिट्टी
(d) Water / पानी
Show Answer
Ans.(d)
Sol. Hydrogen gas is highly flammable and burns in air at a very wide range of concentrations between 4% to 75% by volume. Hydrogen gas cannot burn in absence of air. But by burning with Oxygen it produces water.
Sol. Hydrogen gas is highly flammable and burns in air at a very wide range of concentrations between 4% to 75% by volume. Hydrogen gas cannot burn in absence of air. But by burning with Oxygen it produces water.
Q11. What is heavy water?
भारी पानी क्या है?
(a) Oxygen + Heavy Hydrogen / ऑक्सीजन + भारी हाइड्रोजन
(b) Hydrogen + Oxygen / हाइड्रोजन + ऑक्सीजन
(c) Hydrogen + New Oxygen/ हाइड्रोजन + नई ऑक्सीजन
(d) Heavy Hydrogen + Heavy Oxygen / भारी हाइड्रोजन + भारी ऑक्सीजन
भारी पानी क्या है?
(a) Oxygen + Heavy Hydrogen / ऑक्सीजन + भारी हाइड्रोजन
(b) Hydrogen + Oxygen / हाइड्रोजन + ऑक्सीजन
(c) Hydrogen + New Oxygen/ हाइड्रोजन + नई ऑक्सीजन
(d) Heavy Hydrogen + Heavy Oxygen / भारी हाइड्रोजन + भारी ऑक्सीजन
Show Answer
Ans.(a)
Sol. Heavy water (D_2 O) Deuterium Oxide is used as a moderator and coolant in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of Hydrogen which comprises both a neutron and a proton. D_2 O is a form of water which reacts with Oxygen to form Deuterium Oxide (D_2 O), also known as heavy water.
Sol. Heavy water (D_2 O) Deuterium Oxide is used as a moderator and coolant in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of Hydrogen which comprises both a neutron and a proton. D_2 O is a form of water which reacts with Oxygen to form Deuterium Oxide (D_2 O), also known as heavy water.
Q12. Water is a good solvent of ionic salts because-
पानी आयनिक लवण का एक अच्छा विलायक है क्योंकि-
(a) It has a high boiling point / इसका उच्च क्वथनांक है
(b) It has a high dipole moment/ इसका द्विध्रुव आघूर्ण अधिक है
(c) It has a high specific heat / इसका अधिक विशिष्ट ताप है
(d) It has no colour / इसमें कोई रंग नहीं है
पानी आयनिक लवण का एक अच्छा विलायक है क्योंकि-
(a) It has a high boiling point / इसका उच्च क्वथनांक है
(b) It has a high dipole moment/ इसका द्विध्रुव आघूर्ण अधिक है
(c) It has a high specific heat / इसका अधिक विशिष्ट ताप है
(d) It has no colour / इसमें कोई रंग नहीं है
Show Answer
Ans.(b)
Sol. Water is good solvent due to its polarity which can easily dissolve into polar compounds. Water dissolves ionic salts by hydrating their component ions. For example, water dissolves NaCl by hydrating and stabling the Na+ and Cl- ions.
Sol. Water is good solvent due to its polarity which can easily dissolve into polar compounds. Water dissolves ionic salts by hydrating their component ions. For example, water dissolves NaCl by hydrating and stabling the Na+ and Cl- ions.
Q13. Large quantities of drinking water is prepared from impure water by-
अशुद्ध पानी से बड़ी मात्रा में पेयजल कैसे तैयार किया जाता है?
(a) Desalination / डिसेलिनेशन
(b) Distillation / आसवन
(c) Ion-exchange / आयन विनिमय
(d) Decantation/ निस्तारण
अशुद्ध पानी से बड़ी मात्रा में पेयजल कैसे तैयार किया जाता है?
(a) Desalination / डिसेलिनेशन
(b) Distillation / आसवन
(c) Ion-exchange / आयन विनिमय
(d) Decantation/ निस्तारण
Show Answer
Ans.(a)
Sol. Desalination is a process that removes minerals from saline water (Also refer to removal of salts and minerals). Seawater desalination has a very effective way of production of potable water for drinking and industries.
Sol. Desalination is a process that removes minerals from saline water (Also refer to removal of salts and minerals). Seawater desalination has a very effective way of production of potable water for drinking and industries.
Q14. Actinides are the elements with atomic numbers from
एक्टिनाइड्स कितनी परमाणु संख्या वाले तत्व हैं
(a) 89 to 103 /89 से 103
(b)101 to 115 / 101 से 115
(c) 97 to 104 /97 से 104
(d)36 from 43 / 36 से 43
एक्टिनाइड्स कितनी परमाणु संख्या वाले तत्व हैं
(a) 89 to 103 /89 से 103
(b)101 to 115 / 101 से 115
(c) 97 to 104 /97 से 104
(d)36 from 43 / 36 से 43
Show Answer
Ans.(a)
Sol. The Actinide series contains elements with atomic numbers 89 to 103 and is the sixth group in the periodic table.
Sol. The Actinide series contains elements with atomic numbers 89 to 103 and is the sixth group in the periodic table.
Q15. Isotopes is that nuclei of atomic nucleus in which-
समस्थानिक परमाणु नाभिक का वह नाभिक है जिसमें-
(a) Number of neutrons is same but number of protons is different / न्यूट्रॉन की संख्या समान है लेकिन प्रोटॉन की संख्या अलग है
(b) Number of protons is same but number of neutrons is different / प्रोटॉन की संख्या समान है लेकिन न्यूट्रॉन की संख्या अलग है
(c) Number of both protons and neutrons is same / प्रोटॉन और न्यूट्रॉन दोनों की संख्या समान है
(d) Number of both protons and neutrons is different / प्रोटॉन और न्यूट्रॉन दोनों की संख्या अलग है
समस्थानिक परमाणु नाभिक का वह नाभिक है जिसमें-
(a) Number of neutrons is same but number of protons is different / न्यूट्रॉन की संख्या समान है लेकिन प्रोटॉन की संख्या अलग है
(b) Number of protons is same but number of neutrons is different / प्रोटॉन की संख्या समान है लेकिन न्यूट्रॉन की संख्या अलग है
(c) Number of both protons and neutrons is same / प्रोटॉन और न्यूट्रॉन दोनों की संख्या समान है
(d) Number of both protons and neutrons is different / प्रोटॉन और न्यूट्रॉन दोनों की संख्या अलग है
Show Answer
Ans.(b)
Sol. The Isotopes are a set of nuclides/atoms having the same number of protons, but a different number of neutrons. In other words, the same atomic number having different atomic mass.
Sol. The Isotopes are a set of nuclides/atoms having the same number of protons, but a different number of neutrons. In other words, the same atomic number having different atomic mass.
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