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.
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
Sol. Nitrous Oxide (N2 O) 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-
पानी में आसानी से घुलनशील है-
(a) Carbon / कार्बन
(b) Nitrogen / नाइट्रोजन
(c) Ammonia / अमोनिया
(d) Iodine/ आयोडीन
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
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 डाइऑक्साइड
(d) Oxygen/ ऑक्सीजन
Sol. The gas usually filled in the electric bulb is 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 / एल्युमीनियम
(b) Gold / सोना
(c) Chromium/ क्रोमियम
(d) Zinc/ जस्ता
Sol. Gold is accessed in the native state.
Q6. Isotopes are those atoms of the same element which have-
आइसोटोप उन तत्वों के परमाणु वह हैं जिनके-
(a) Atomic mass is same but atomic number is different / परमाणु द्रव्यमान समान है परमाणु संख्या अलग है
(b) Atomic mass is different but atomic number is same / परमाणु द्रव्यमान भिन्न है परमाणु संख्या समान है
(c) Atomic number and atoms mass both are same / परमाणु संख्या और परमाणु द्रव्यमान दोनों समान हैं
(d) None of the above / इनमे से कोई भी नहीं
Sol. The same atomic number having different atomic mass.
रेडियोधर्मिता किसके द्वारा मापी जा सकती है
(a) Hydrometer / हाइड्रोमीटर
(b) Geiger Counter / गीगर काउंटर
(c) Seismometer / भूकम्पमान
(d) Ammeter / एम्मिटर
Sol. The Geiger-Muller Counter also called a Geiger Counter, is an instrument used for detection and measurement ionizing radiation. It detects radiation such as Alpha particles, Beta particles and Gamma rays using the ionization produced in a Geiger-Muller tube, which gives its name to the instrument.
पानी के अपघटन में ऊर्जा का किस प्रकार का उत्पादन होता है
(a) Light / प्रकाश
(b) Heat / गर्मी
(c) Sound / ध्वनि
(d) Acid / अम्ल
Sol. Hydrolysis is the chemical reaction in which ions of a salt dissolved in water, mutually combines with a water molecule to form an acidic or basic solution and the energy produced in this process is in the form of heat.
कोहरा किस प्रकार की कोलाइडयन प्रणाली व्यक्त करता है:
(a) Liquid in a gas / गैस में एक तरल पदार्थ
(b) Gas in a liquid / तरल में एक गैस
(c) Solid in a gas / गैस में एक ठोस
(d) Liquid in Liquid / तरल में तरल
Sol. When the water vapour in the air condensed to form small drops of water, the fog is formed.
Q10. The chemical composition of diamond is?
हीरे की रासायनिक संरचना क्या है?
(a) Carbon / कार्बन
(b) Nitrogen / नाइट्रोजन
(c) Nickel / निकेल
(d) Zinc /जिंक
Sol. Chemically diamond is the purest form of Carbon (crystal structure).
हवा में निम्न में से किस गैस की उपस्थिति के कारण पीतल हवा में फीका हो जाता है?
(a) Oxygen/ ऑक्सीजन
(b) Hydrogen sulphide/ हाइड्रोजन सल्फाइड
(c)Carbon dioxide/ कार्बन डाइऑक्साइड
(d) Nitrogen नाइट्रोजन
Sol. Because of the presence of hydrogen sulphide in Brass.
सामान्य उर्वरकों में सबसे आवश्यक तीन तत्व हैं:
(a) Sulphur, Phosphorous and sodium / सल्फर, फास्फोरस और सोडियम
(b) Nitrogen, Potassium and Phosphorous/ नाइट्रोजन, पोटेशियम और फॉस्फोरस
(c) Phosphorous, Sodium and Nitrogen / फॉस्फोरस, सोडियम और नाइट्रोजन
(d) Calcium, Phosphorous and Potassium / कैल्शियम, फॉस्फोरस और पोटेशियम
Sol. Fertilizer is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a soil to supply one or more plant nutrients essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen. Potassium and Phosphorous
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
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.
‘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
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.
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
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).
