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. 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
Ans.(c)
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.
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
Show Answer
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.
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
Show Answer
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.
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
Show Answer
Ans.(a)
Sol. The gas usually filled in the electric bulb is Nitrogen.
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
Show Answer
Ans.(b)
Sol. Gold is accessed in the native state.
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
Show Answer
Ans.(b)
Sol. The same atomic number having different atomic mass.
Sol. The same atomic number having different atomic mass.
Q7. Radioactivity is measured by-
रेडियोधर्मिता किसके द्वारा मापी जा सकती है
(a) Hydrometer / हाइड्रोमीटर
(b) Geiger Counter / गीगर काउंटर
(c) Seismometer / भूकम्पमान
(d) Ammeter / एम्मिटर
रेडियोधर्मिता किसके द्वारा मापी जा सकती है
(a) Hydrometer / हाइड्रोमीटर
(b) Geiger Counter / गीगर काउंटर
(c) Seismometer / भूकम्पमान
(d) Ammeter / एम्मिटर
Show Answer
Ans.(b)
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.
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.
Q8. What form of energy is produced in the decomposition of water?
पानी के अपघटन में ऊर्जा का किस प्रकार का उत्पादन होता है
(a) Light / प्रकाश
(b) Heat / गर्मी
(c) Sound / ध्वनि
(d) Acid / अम्ल
पानी के अपघटन में ऊर्जा का किस प्रकार का उत्पादन होता है
(a) Light / प्रकाश
(b) Heat / गर्मी
(c) Sound / ध्वनि
(d) Acid / अम्ल
Show Answer
Ans.(b)
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.
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.
Q9. Which type of colloidal system is expressed in the fog:
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
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
Show Answer
Ans.(a)
Sol. When the water vapour in the air condensed to form small drops of water, the fog is formed.
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
Show Answer
Ans.(a)
Sol. Chemically diamond is the purest form of Carbon (crystal structure).
Sol. Chemically diamond is the purest form of Carbon (crystal structure).
Q11. Brass gets discoloured in air because of the presence of which of the following gases in air?
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
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
Show Answer
Ann.(b)
Sol. Because of the presence of hydrogen sulphide in Brass.
Sol. Because of the presence of hydrogen sulphide in Brass.
Q12. The three elements most needed in common fertilisers are:
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
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
Show Answer
Ans.(b)
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
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
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.
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
'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.
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
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
Show Answer
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).
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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