General Science Questions for Railway Exam 2018 : 3rd May

General Science Questions for Railway 2018:

Dear Students,

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 90,000 seats to be filled by the valid candidates. Opportunity is here but you have to welcome it with a provident strategy. The exam will be conducted in the months of May 2018. 

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 90,000 सीटों को वैध उम्मीदवारों द्वारा भरा जाएगा. आपके पास बहुत अच्छा अवसर है और आपको इसे एक बेहतर रणनीति से प्राप्त करना होगा. परीक्षा मई 2018 के महीने में आयोजित की जायेगी.

Q1. Laughing gas used as anesthesia by doctors is-
चिकित्सकों द्वारा संज्ञाहरण के रूप में उपयोग की जाने वाली हँसिंग गैस क्या है- 
(a) Nitrogen  / नाइट्रोजन
(b) Nitrogen Oxide  / नाइट्रोजन ऑक्साइड
(c) Nitrous Oxide  / नाइट्रस ऑक्साइड
(d) Nitrogen dioxide  / नाइट्रोजन डाइऑक्साइड

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Ans.(c)
Sol. Nitrous Oxide (N₂O) is also known as laughing gas. It is a colourless gas with a sweet odour and taste. Inhalation leads to disorientation, euphoria, numberss, loss of coordination, dizziness and ultimately a loss of consciousness. It is also used as the anesthetic gas.

Q2. Easily soluble in water- 
निम्न में से _____पानी में आसानी से घुलनशील है.
(a) Carbon/कार्बन
(b) Nitrogen/नाइट्रोजन
(c) Ammonia/अमोनिया
(d) Iodine/आयोडीन

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Ans.(c)
Sol. Ammonia being a polar molecule dissolves readily in water. This is due to the Hydrogen atoms of Ammonia which are bonded with a highly electronegative Nitrogen and the Hydrogen atoms of water molecules which are bonded with the highly electronegative Oxygen atom.

Q3.  The technique of chromatography is used to-
क्रोमैटोग्राफी की तकनीक का उपयोग _______ के लिए किया जाता है. 
(a) Identify colour substances(रंग पदार्थों को पहचानें)
(b) Determine the structure of substances(पदार्थों की संरचना का निर्धारण )
(c) Dry distillation of colouring substances(रंगीन पदार्थों का सूखा आसवन)
(d) Separate the substances from a mixture(मिश्रण से पदार्थों को अलग करने)

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Ans.(d)
Sol. Chromatography is a separation technique used to separate the different components in a liquid mixture. The purpose of preparative chromatography is to separate the components of a mixture for more advanced use and thus a form of purification.

Q4. The gas usually filled in the electric bulb is
आमतौर पर बिजली के बल्ब में भरी जाने वाली गैस कौन सी है
(a)Nitrogen(नाइट्रोजन)
(b) Hydrogen(हाइड्रोजन)
(c) Carbon dioxide(कार्बन डाइआक्साइड)
(d) Oxygen(ऑक्सीजन)

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Ans.(a)
Sol. Nitrogen.

Q5. Which one of the following metals is accessed in the native state? 
निम्नलिखित में से कौन सी धातु का उपयोग मूल अवस्था में किया जाता है?
(a) Aluminium(अल्युमीनियम)
(b) Gold(सोना)
(c) Chromium(क्रोमियम)
(d) Zinc(जस्ता)

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Ans.(b)
Sol. Gold

Q6. Which one of the following is the correct sequence of the given substances in the decreasing order of their densities?  
निम्नलिखित में से कौन से पदार्थ,  उनके घनत्व के घटते क्रम में दिए गए पदार्थों का सही क्रम है.
(a) Steel > Mercury > Gold / स्टील> पारा > सोना
(b) Gold > Mercury > Steel / सोना> पारा > स्टील
(c) Steel > Gold > Mercury / स्टील > सोना> पारा
(d) Gold > Steel > Mercury / सोना> स्टील> पारा

Show Answer

Ans.(b)
Sol.              Substance    Density
                    (gram/cm3) (Kg./meter3)
Gold       19.3              19,300 
Mercury      13.6              13,534
Steel        7.8               7,870
Thus, from the above table, we see the correct sequence of decreasing order of the substances Gold > Mercury > Steel.

Q7. Aluminium surface is often ‘Anodized’. This means the deposition of a layer of-
एल्यूमिनियम की सतह का अक्सर 'उद् – द्वारीकरण’ किया जाता है. इसका अर्थ किस परत का अभिसाक्ष्य है-
(a) Chromium Oxide/ क्रोमियम ऑक्साइड
(b) Aluminium Oxide / अल्यूमिनियम ऑक्साइड
(c) Nickel Oxide / निकल ऑक्साइड
(d) Zinc Oxide / जिंक आक्साइड

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Ans.(b)
Sol. Anodizing is an electrical-chemical process by which the surface of a metal is made durable and rust resistant. In this process, a layer of Aluminium Oxide is deposited on Aluminium.

Q8. The purity of Milk is determined by—
दूध की शुद्धता किसके द्वारा निर्धारित की जाती है
(a) Hydrometer/ हाइड्रोमीटर
(b) Lactometer/ लैक्टोमीटर
(c) Stalagmometer/स्टालाग्मोमीटर
(d) Thermometer / थर्मामीटर

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Ans.(b)
Sol. Lactometer is a device used for finding the purity of a milk sample. It works on the principle of Archimede's principle.ol. Among the metals, gold is the least reactive, so this was accessed the in the native (free) state.

Q9. Which one of the following is used for manufacturing safety matches? 
माचिस के निर्माण के लिए निम्न में से किसका प्रयोग किया जाता है?
(a) Di-phosphorus / डि-फास्फोरस
(b) Black phosphorus  / ब्लैक फॉस्फोरस
(c) Red phosphorus / लाल फॉस्फोरस
(d) Scarlet phosphorus / स्कार्लेट फास्फोरस

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Ans.(c)
Sol. Red Phosphorus and phosphorus trisulfide is used for manufacturing safety matches. The matchstick’s head is typically composed of the mixture of potassium chlorate, red lead, antimony sulphide and glue. The striking surface of matchboxes is typically composed of red phosphorus, antimony sulphide, powdered glass and glue.

Q10. 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

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Ans.(b)
Sol. Sumio Iijima is a Japanse physicist, often cited as the inventor of carbon nanotubes.

Q11. In India, water desalination plant is located in- 
भारत में, पानी के अलवणीकरण संयंत्र में स्थित है-
(a) Lakshadweep / लक्षद्वीप
(b) Goa / गोवा
(c) Cuttack / कटक
(d) Chennai / चेन्नई

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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). 

Q12. 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

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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".

Q13. 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 / लीड
(d) Copper / कॉपर

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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.

Q14. 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

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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.

Q15. An atomic pile is used for 
एक परमाणु ढेर ____के लिए प्रयोग किया जाता है.
(a) producing X-rays /एक्स-रे उत्पादन
(b) conducting nuclear fission / परमाणु विखंडन आयोजित करना
(c) coducting thermonuclear fusion / थर्मोन्यूक्लियर संलयन आयोजित करना
(d) accelerating atoms/ परमाणुओं को तीव्र करना

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Ans.(b)
Sol. An atomic pile is a nuclear reactor that uses controlled nuclear fission to generate energy. The most common reactor consists of large assembly of graphite (an allotropic form of carbon) blocks having rods of uranium metal (fuel).

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