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. Carbon Nanotubes (CNTs) were prepared by-
कार्बन नैनोट्यूब (CNTs) किसके द्वारा तैयार किया गया था-
(a) Fuller /फुलर
(b) Iijima / ईजिमा
(c) Faraday / फैराडे
(d) Raman / रमन
Ans.(b)
Sol. Sumio Iijima is a Japanse physicist, often cited as the inventor of carbon nanotubes.
Sol. Sumio Iijima is a Japanse physicist, often cited as the inventor of carbon nanotubes.
Q2. In India, water desalination plant is located in-
भारत में, पानी के अलवणीकरण संयंत्र कहाँ स्थित है?
(a) Lakshadweep / लक्षद्वीप
(b) Goa / गोवा
(c) Cuttack / कटक
(d) Chennai /चेन्नई
Show Answer
Ans.(a)
Sol. In India, first water desalination plant was opened in 2005 at Kavaratti in the Lakshadweep islands. This LTTD (Low Temperature Thermal Desalination) desalination plant with a capacity of 1 lakh litre per day was developed indigenously by National Institute of Ocean Technology (NIOT).
Sol. In India, first water desalination plant was opened in 2005 at Kavaratti in the Lakshadweep islands. This LTTD (Low Temperature Thermal Desalination) desalination plant with a capacity of 1 lakh litre per day was developed indigenously by National Institute of Ocean Technology (NIOT).
Q3. Which of the following is not an isotope of hydrogen?
इनमें से कौन सा हाइड्रोजन का समस्थानिक (आइसोटोप) नहीं है?
(a) Tritium/ ट्रिटियम
(b) Yttrium/ अट्रियम
(c) Protium/ प्रोटियम
(d) Deuterium/ ड्यूटेरियम
Show Answer
Ans.(b)
Sol. Hydrogen is the only element whose isotopes have different names that are in common use today. The 2H (or hydrogen-2) isotope is usually called deuterium, while the 3H (or hydrogen-3) isotope is usually called tritium. The ordinary isotope of hydrogen, with no neutrons, is sometimes called "protium".
Sol. Hydrogen is the only element whose isotopes have different names that are in common use today. The 2H (or hydrogen-2) isotope is usually called deuterium, while the 3H (or hydrogen-3) isotope is usually called tritium. The ordinary isotope of hydrogen, with no neutrons, is sometimes called "protium".
Q4. Which one of the following metals pollutes the air of a city having large number of automobiles?
निम्नलिखित में से कौन सी धातु बड़ी संख्या में ऑटोमोबाइल वाले शहर की हवा को प्रदूषित करती है?
(a) Cadmium / कैडमियम
(b) Chromium / क्रोमियम
(c) Lead / लेड
(d) Copper / तांबा
Show Answer
Ans.(c)
Sol. The history of car pollution has been one of air and water contamination followed by regualated improvement. Cars and trucks cause a lot of air the pollution in the world today, and contribute a lot to the most common and dangerous air pollutants. About 2.3 million tons of lead in lead acid (PbA) batteries is on the road now. Over 1 million tons of lead is used in making new batteries each year. In the past, motor vehicles were the biggest source of lead. But since leaded gasoline has been phased out, lead emissions have decreased by about 98 percent. Today, metal processing is the biggest source of atmospheric lead.
Sol. The history of car pollution has been one of air and water contamination followed by regualated improvement. Cars and trucks cause a lot of air the pollution in the world today, and contribute a lot to the most common and dangerous air pollutants. About 2.3 million tons of lead in lead acid (PbA) batteries is on the road now. Over 1 million tons of lead is used in making new batteries each year. In the past, motor vehicles were the biggest source of lead. But since leaded gasoline has been phased out, lead emissions have decreased by about 98 percent. Today, metal processing is the biggest source of atmospheric lead.
Q5. CNG used in automobiles to check pollution mainly consist of-
वाहनों में प्रदूषण की जांच के लिए उपयोग की जाने वाली CNG में मुख्य रूप से क्या निहित है-
(a) CH_4
(b) CO_2
(c) N_2
(d) H_2
Show Answer
Ans.(a)
Sol. CNG is made by compressed natural gas which is mainly composed of Methane (CH4). It is a mixture of hydrocarbons which is found deep inside Earth and have approx.. 80% to 90% of Methane.
Sol. CNG is made by compressed natural gas which is mainly composed of Methane (CH4). It is a mixture of hydrocarbons which is found deep inside Earth and have approx.. 80% to 90% of Methane.
Q6. Gasohol is
गैसोहोल क्या है?
(a) Ethyl alcohol + Petrol / एथिल एल्कोहल + पेट्रोल
(b) Natural gas + Ethyl alcohol / प्राकृतिक गैस + एथिल अल्कोहल
(c) Any gas dissolved in alcohol / अल्कोहल में विघटित कोई भी गैस
(d) Ethyl alcohol + Kerosene oil / एथिल एल्कोहल + केरोसिन तेल
Show Answer
Ans.(a)
Sol. Gasohol, a gasoline extender made from a mixture of gasoline (90%) and ethanol (10 % often obtained by fermenting agricultural crops) or gasoline (97%) and methanol or wood alcohol (3%). Gasohol has higher octane or antiknock properties by which it burns more slowly, coolly and completely.
Sol. Gasohol, a gasoline extender made from a mixture of gasoline (90%) and ethanol (10 % often obtained by fermenting agricultural crops) or gasoline (97%) and methanol or wood alcohol (3%). Gasohol has higher octane or antiknock properties by which it burns more slowly, coolly and completely.
Q7. To avoid ‘knocking’ of the engine of a car, which one of the following is used as an anti-knocking agent?
एक कार के इंजन को 'नॉकिंग' से बचने के लिए, इनमें से क्या एंटी-नॉकिंग एजेंट के रूप में उपयोग किया जाता है?
(a) Ethyl alcohol / एथिल अल्कोहल
(b) Butane/ब्युटेन
(c) Lead Tetra Ethyl / लेड टेट्रा एथिल
(d) White Petrol /वाइट पेट्रोल
एक कार के इंजन को 'नॉकिंग' से बचने के लिए, इनमें से क्या एंटी-नॉकिंग एजेंट के रूप में उपयोग किया जाता है?
(a) Ethyl alcohol / एथिल अल्कोहल
(b) Butane/ब्युटेन
(c) Lead Tetra Ethyl / लेड टेट्रा एथिल
(d) White Petrol /वाइट पेट्रोल
Show Answer
Ans.(c)
Sol. Tetraethyl Lead (CH3CH2)4Pb is the chief antiknock agent for automotive gasoline or petrol. In the hot cylinder of a gasoline engine, the bonds between the Lead atom and the Ethyl groups are broken. Upon combustion, the Lead atom forms Lead Oxide (PbO) which prevents fractions of the fuel mixture from burning too quickly and causing a highly undesirable “engine knock.” It is mixed with petrol to increase its anti-knocking rate.
Sol. Tetraethyl Lead (CH3CH2)4Pb is the chief antiknock agent for automotive gasoline or petrol. In the hot cylinder of a gasoline engine, the bonds between the Lead atom and the Ethyl groups are broken. Upon combustion, the Lead atom forms Lead Oxide (PbO) which prevents fractions of the fuel mixture from burning too quickly and causing a highly undesirable “engine knock.” It is mixed with petrol to increase its anti-knocking rate.
Q8. Which one of the following is also called Stranger Gas?
निम्नलिखित में से किसे स्ट्रेंजर गैस भी कहा जाता है?
(a) Argon / आर्गन
(b) Neon / नीओन
(c) Xenon / ज़ेनॉन
(d) Nitrous Oxide / नाइट्रस ऑक्साइड
निम्नलिखित में से किसे स्ट्रेंजर गैस भी कहा जाता है?
(a) Argon / आर्गन
(b) Neon / नीओन
(c) Xenon / ज़ेनॉन
(d) Nitrous Oxide / नाइट्रस ऑक्साइड
Show Answer
Ans.(c)
Sol. Xenon is a chemical gas with symbol Xe and atomic number 54. It is a rare, odourless, colourless, tasteless, chemically unreactive gas. Xenon gas is also known as stranger gas as its volume is low in the atmosphere (0.08 parts per million of xenon). It was discovered in England by the Scottish chemist William Ramsay and British chemist Morris Travers in 1898.
Sol. Xenon is a chemical gas with symbol Xe and atomic number 54. It is a rare, odourless, colourless, tasteless, chemically unreactive gas. Xenon gas is also known as stranger gas as its volume is low in the atmosphere (0.08 parts per million of xenon). It was discovered in England by the Scottish chemist William Ramsay and British chemist Morris Travers in 1898.
Q9. The gas used to inflate the tyres of an aircraft is-
एक विमान के टायर में हवा भरने के लिए कौन सी गैस का प्रयोग किया जाता है?
(a) Hydrogen / हाइड्रोजन
(b) Nitrogen / नाइट्रोजन
(c) Helium /हीलियम
(d) Neon / नीयन
एक विमान के टायर में हवा भरने के लिए कौन सी गैस का प्रयोग किया जाता है?
(a) Hydrogen / हाइड्रोजन
(b) Nitrogen / नाइट्रोजन
(c) Helium /हीलियम
(d) Neon / नीयन
Show Answer
Ans.(b)
Sol. Nitrogen gas is used in the types of an aeroplane. This is because the nitrogen gas does not support combustion and can assist in preventing wheel fire when the aircraft lands (braking and high speed can produce dangerously high temperatures) unlike in oxygen. There are other benefits but effectively it is being the lowest cost gas that does not support combustion. It is preferred in comparison with the oxygen because nitrogen does not contain water. Thus, when the plane is at more height, gas in tyres does not get frozen.
Sol. Nitrogen gas is used in the types of an aeroplane. This is because the nitrogen gas does not support combustion and can assist in preventing wheel fire when the aircraft lands (braking and high speed can produce dangerously high temperatures) unlike in oxygen. There are other benefits but effectively it is being the lowest cost gas that does not support combustion. It is preferred in comparison with the oxygen because nitrogen does not contain water. Thus, when the plane is at more height, gas in tyres does not get frozen.
Q10. Out of the following is not an alloy?
निम्नलिखित में से कौन सी एक मिश्र धातु नहीं है?
(a) Steel / स्टील
(b) Brass / पीतल
(c) Bronze / कांस्य
(d) Copper / कॉपर
Show Answer
Ans.(d)
Sol. Copper is a metal, however steel, brass and bronze are alloys.
Sol. Copper is a metal, however steel, brass and bronze are alloys.
Q11. Which among the following is white phosphorus?
निम्नलिखित में से कौन सा सफेद फास्फोरस है?
(a) P1
(b) P6
(c) P4
(d) P5
निम्नलिखित में से कौन सा सफेद फास्फोरस है?
(a) P1
(b) P6
(c) P4
(d) P5
Show Answer
Ans.(c)
Sol. The most important form of elemental phosphorus from the perspective of applications and chemical literature is white phosphorus. It consists of tetrahedral P4molecules, in which each atom is bound to the other three atoms by a single bond.
Sol. The most important form of elemental phosphorus from the perspective of applications and chemical literature is white phosphorus. It consists of tetrahedral P4molecules, in which each atom is bound to the other three atoms by a single bond.
Q12. Alloy of which metal is used to make aeroplane and parts of the compartment of the train?
हवाई जहाज और ट्रेन के डिब्बे के कुछ हिस्सों को बनाने के लिए किस मिश्र धातु का उपयोग किया जाता है?
(a) Copper / कॉपर
(b) Iron / आयरन
(c) Aluminium / एल्यूमिनियम
(d) None of these / इनमे से कोई नहीं
हवाई जहाज और ट्रेन के डिब्बे के कुछ हिस्सों को बनाने के लिए किस मिश्र धातु का उपयोग किया जाता है?
(a) Copper / कॉपर
(b) Iron / आयरन
(c) Aluminium / एल्यूमिनियम
(d) None of these / इनमे से कोई नहीं
Show Answer
Ans.(c)
Sol. Low density and strength make Aluminium ideal for construction of aircraft, lightweight vehicles and ladders. An alloy of Aluminium called Duralumin is often used instead of pure Aluminium because of its improved properties. Easy shaping and corrosion resistance make Aluminium a good material for drinking cans and roofing materials.
Sol. Low density and strength make Aluminium ideal for construction of aircraft, lightweight vehicles and ladders. An alloy of Aluminium called Duralumin is often used instead of pure Aluminium because of its improved properties. Easy shaping and corrosion resistance make Aluminium a good material for drinking cans and roofing materials.
Q13. What is the chemical name for ‘baking soda?
'बेकिंग सोडा के लिए रासायनिक नाम क्या है?
(a) Sodium carbonate / सोडियम कार्बोनेट
(b) Sodium bicarbonate/ सोडियम बाइकार्बोनेट
(c) Sodium nitrite / सोडियम नाइट्राइट
(d) Sodium nitrate / सोडियम नाइट्रेट
Show Answer
Ans. (b)
Sol. Sodium bicarbonate or sodium hydrogen carbonate is the chemical compound with the formula NaHCO3. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda (sodium carbonate). Since it has long been known and is widely used, the slat has many related names such as baking soda, bread soda, cooking soda, and bicarbonate of soda.
Sol. Sodium bicarbonate or sodium hydrogen carbonate is the chemical compound with the formula NaHCO3. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda (sodium carbonate). Since it has long been known and is widely used, the slat has many related names such as baking soda, bread soda, cooking soda, and bicarbonate of soda.
Q14. Which one of the following alloys is called an amalgam?
निम्नलिखित में से किसकी मिश्र धातु को अमलगम कहा जाता है?
(a) Zinc / जिंक - Copper / कॉपर
(b) Copper / कॉपर - Tin / टिन
(c) Mercury/ पारा – zinc/ जिंक
(d) Lead / लेड – Zinc/ जिंक
निम्नलिखित में से किसकी मिश्र धातु को अमलगम कहा जाता है?
(a) Zinc / जिंक - Copper / कॉपर
(b) Copper / कॉपर - Tin / टिन
(c) Mercury/ पारा – zinc/ जिंक
(d) Lead / लेड – Zinc/ जिंक
Show Answer
Ans.(c)
Sol. An amalgam is a substance formed by the reaction of mercury with another metal.
Sol. An amalgam is a substance formed by the reaction of mercury with another metal.
Q15. Solder used in soldering metal pieces consists of any alloy of
सोल्डरिंग धातु के टुकड़ों में इस्तेमाल होने वाले सोल्डर किस मिश्र धातु के होते हैं?
(a) Tin and Zinc / टिन और जिंक
(b) Tin and Lead / टिन और लेड
(c) Tin, Zinc and Copper / टिन, जिंक और कॉपर
(d) Tin, Lead and Zinc / टिन, लेड और जिंक
सोल्डरिंग धातु के टुकड़ों में इस्तेमाल होने वाले सोल्डर किस मिश्र धातु के होते हैं?
(a) Tin and Zinc / टिन और जिंक
(b) Tin and Lead / टिन और लेड
(c) Tin, Zinc and Copper / टिन, जिंक और कॉपर
(d) Tin, Lead and Zinc / टिन, लेड और जिंक
Show Answer
Ans.(b)
Sol. The common composition of solder is 32% Tin, 68% Lead. This combination has a low melting point and is useful for soldering components that are sensitive to heat.
Sol. The common composition of solder is 32% Tin, 68% Lead. This combination has a low melting point and is useful for soldering components that are sensitive to heat.
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