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. Which is the most abundant element after Oxygen?
ऑक्सीजन के बाद सबसे प्रचुर मात्रा में पाए जाने वाला तत्व कौन सा है?
(a) Silicon / सिलिकॉन
(b) Carbon / कार्बन
(c) Sodium / सोडियम
(d) Chlorine /क्लोरीन
Ans.(a)
Sol. The most abundant element on earth’s surface after Oxygen is Silicon. It was discovered by J.J. Berzelius in 1824. The word ‘Silicon’ was taken from the Latin word silex. Silicon chips are used as a semiconductor in computers.
Sol. The most abundant element on earth’s surface after Oxygen is Silicon. It was discovered by J.J. Berzelius in 1824. The word ‘Silicon’ was taken from the Latin word silex. Silicon chips are used as a semiconductor in computers.
Q2. Chemically “Plaster of Paris” is:
“प्लास्टर ऑफ़ पेरिस” रासायनिक रूप से क्या है:
(a) Calcium Sulphate /कैल्शियम सल्फेट
(b) Calcium Carbonate /कैल्शियम कार्बोनेट
(c) Calcium Oxide / कैल्शियम ऑक्साइड
(d) Calcium Oxalate /कैल्शियम ऑक्सालेट
Show Answer
Ans.(a)
Sol. A group of gypsum cement, essentially hemihydrated Calcium Sulphate (CaSO4. 1/2 H2O), a white powder that forms a paste when it is mixed with water and then hardens into a solid used in making a cast, mould and sculpture.
Sol. A group of gypsum cement, essentially hemihydrated Calcium Sulphate (CaSO4. 1/2 H2O), a white powder that forms a paste when it is mixed with water and then hardens into a solid used in making a cast, mould and sculpture.
Q3. Bronze is an alloy of copper and-
कांस्य तांबे और ________की मिश्र धातु है –
(a) Tin / टिन
(b) Aluminium / एल्युमीनियम
(c) Silver / सीवर
(d) Nickel / निकेल
Show Answer
Ans.(a)
Sol. Bronze is an alloy made up of Copper and another metal Tin. Compositions may very but most modern bronze is 88% Copper and 12% Tin.
Sol. Bronze is an alloy made up of Copper and another metal Tin. Compositions may very but most modern bronze is 88% Copper and 12% Tin.
Q4. Which of the following alloys has a maximum percentage of Copper?
निम्नलिखित में से कौन सा मिश्र धातु में कॉपर का अधिकतम प्रतिशत है?
(a) Brass / पीतल
(b) Bronze / कांस्य
(c) German Silver/ जर्मन सिल्वर
(d) Delta Metal / डेल्टा धातु
Show Answer
Ans.(b)
Sol. Brass consists 68–71% Copper and rest is Zinc. Bronze consists 88% Copper and 12% Tin. German silver has almost 50% Copper. Delta consists 60% Copper, 38% Zinc,2% Fe.
Sol. Brass consists 68–71% Copper and rest is Zinc. Bronze consists 88% Copper and 12% Tin. German silver has almost 50% Copper. Delta consists 60% Copper, 38% Zinc,2% Fe.
Q5. Which metal exists as a common component in Brass, Bronze and German Silver?
पीतल, कांस्य और जर्मन चांदी में एक आम घटक के रूप में कौन सी धातु मौजूद है?
(a) Antimony/एंटीमनी
(b) Copper/तांबा
(c) Tin/टिन
(d) Zinc/जस्ता
Show Answer
Ans.(b)
Sol. Brass consists 68-71% Copper and rest is Zinc. Bronze consists 88% Copper and 12% Tin. German silver has almost 50% Copper. Gunmetal consists 85% Copper, 5% Tin, 5% Lead, 5% Zinc.
Sol. Brass consists 68-71% Copper and rest is Zinc. Bronze consists 88% Copper and 12% Tin. German silver has almost 50% Copper. Gunmetal consists 85% Copper, 5% Tin, 5% Lead, 5% Zinc.
Q6. 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
Show Answer
Ans.(c)
Sol. Nitrous Oxide (N_2 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 (N_2 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.
Q7. Easily soluble in water-
पानी में आसानी से घुलनशील है-
(a) Carbon/कार्बन
(b) Nitrogen/नाइट्रोजन
(c) Ammonia/अमोनिया
(d) Iodine/आयोडीन
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.
Q8 Which is the purest form of iron
आयरन का सबसे शुद्ध रूप क्या है-
(a) Cast iron/कास्ट आयरन
(b) Pig iron/पिग आयरन
(c)Wrought iron/रौघ्ट आयरन
(d) Steel/स्टील
आयरन का सबसे शुद्ध रूप क्या है-
(a) Cast iron/कास्ट आयरन
(b) Pig iron/पिग आयरन
(c)Wrought iron/रौघ्ट आयरन
(d) Steel/स्टील
Show Answer
Ans.(c)
Sol. Wrought Iron is the purest form Iron. It contains 0.12–0.25 carbon.
Sol. Wrought Iron is the purest form Iron. It contains 0.12–0.25 carbon.
Q9. An aqueous solution of copper sulphate is acidic in nature because the salt undergoes-
कॉपर सल्फेट का एक जलीय घोल प्रकृति में अम्लीय होता है क्योंकि नमक का –
(a) Dialysis/अपोहन होता है
(b) Electrolysis/विद्युतपघटन होता है
(c) Hydrolysis/जलीय संलयन होता है
(d) Photolysis/फोटोलैसिस होता है
कॉपर सल्फेट का एक जलीय घोल प्रकृति में अम्लीय होता है क्योंकि नमक का –
(a) Dialysis/अपोहन होता है
(b) Electrolysis/विद्युतपघटन होता है
(c) Hydrolysis/जलीय संलयन होता है
(d) Photolysis/फोटोलैसिस होता है
Show Answer
Ans.(c)
Sol. Copper sulphate reacts with water which produces strong acid H_2 SO_4 and weak base Cu (OH) as there is a process of hydrolysis. So it is acidic in nature.
CuSO_4+2H_2 O→H_2 SO_4+Cu(OH)_2
Sol. Copper sulphate reacts with water which produces strong acid H_2 SO_4 and weak base Cu (OH) as there is a process of hydrolysis. So it is acidic in nature.
CuSO_4+2H_2 O→H_2 SO_4+Cu(OH)_2
Q10. Sodawater-obtained by passing carbon dioxide in water is:
पानी में से कार्बन डाइऑक्साइड गुजार कर प्राप्त सोडावाटर क्या है:
(a) An oxidizing agent/एक ऑक्सीकरण एजेंट
(b) Basic in nature/प्रकृति में क्षार
(c) Acidic in nature/प्रकृति में अम्लीय
(d) Reducing agent/अपचायक कारक
Show Answer
Ans.(c)
Sol. The carbon dioxide (CO_2 ) gas dissolved in water can cause water to become acidic. When carbon dioxide is dissolved in the water, if forms a carbonic acid (H_2 CO_3) by reacting with water (H_2 O) and remains in dissolved state at high pressure. So, the soda water becomes acidic in nature.
Sol. The carbon dioxide (CO_2 ) gas dissolved in water can cause water to become acidic. When carbon dioxide is dissolved in the water, if forms a carbonic acid (H_2 CO_3) by reacting with water (H_2 O) and remains in dissolved state at high pressure. So, the soda water becomes acidic in nature.
Q11. Which one of the following atomic plants of India is located in the IV Seismic Zone?
भारत का निम्नलिखित में से कौन सा परमाणु संयंत्र में IV भूकंपी क्षेत्र में स्थित है?
(a) Kaiga /कैगा
(b) Kalpakkam /कलपक्कम
(c) Narora/नरोरा
(d) Tarapur/तारापुर
भारत का निम्नलिखित में से कौन सा परमाणु संयंत्र में IV भूकंपी क्षेत्र में स्थित है?
(a) Kaiga /कैगा
(b) Kalpakkam /कलपक्कम
(c) Narora/नरोरा
(d) Tarapur/तारापुर
Show Answer
Ans.(c)
Sol. Narora power station is located in the IV Seismic Zone. Kalpakkam is located into the II Seismic Zone. Kaiga and Tarapur are located into the III Seismic Sone.
Sol. Narora power station is located in the IV Seismic Zone. Kalpakkam is located into the II Seismic Zone. Kaiga and Tarapur are located into the III Seismic Sone.
Q12. The oil in the wick of an oil lamp rises up due to –
एक तेल के लैंप बाती में तेल के बढ़ने का कारण होता है-
(a) Capillary action / केशिका क्रिया
(b) Low viscosity of oil /तेल की कम चिपचिपाहट
(c) Gravitational force / गुरुत्वाकर्षण बल
(d) Pressure difference / दबाव अंतर
एक तेल के लैंप बाती में तेल के बढ़ने का कारण होता है-
(a) Capillary action / केशिका क्रिया
(b) Low viscosity of oil /तेल की कम चिपचिपाहट
(c) Gravitational force / गुरुत्वाकर्षण बल
(d) Pressure difference / दबाव अंतर
Show Answer
Ans.(a)
Sol.The oil in the wick of an oil lamp rises up is an example of capillary action.
Sol.The oil in the wick of an oil lamp rises up is an example of capillary action.
Q13. The working of a rocket is based on the principle of –
एक रॉकेट की कार्यान्वयन का सिद्धांत का आधार है –
(a) Conservation of momentum / संवेग का संरक्षण
(b) Conservation of mass / द्रव्यमान का संरक्षण
(c) Conservation of energy / ऊर्जा का संरक्षण
(d) Conservation of angular momentum / कोणीय संवेग का संरक्षण
Show Answer
Ans.(a)
Sol.The working principle of rocket is conservation of momentum.
Sol.The working principle of rocket is conservation of momentum.
Q14. What is absolute zero temperature?
निरपेक्ष शून्य तापमान क्या है?
(a) The starting point of any temperature scale / किसी भी तापमान का प्रारंभिक बिंदु
(b) Theoretically the lowest possible temperature / सैद्धांतिक रूप से सबसे कम संभव तापमान
(c) The temperature at which the vapour of any liquid substance is condensed. / तापमान जिस पर किसी भी तरल पदार्थ की वाष्प घनी होती है
(d) The temperature at which all material in vapour form. / तापमान जिस पर सभी पदार्थ वाष्प रूप में होते हैं.
निरपेक्ष शून्य तापमान क्या है?
(a) The starting point of any temperature scale / किसी भी तापमान का प्रारंभिक बिंदु
(b) Theoretically the lowest possible temperature / सैद्धांतिक रूप से सबसे कम संभव तापमान
(c) The temperature at which the vapour of any liquid substance is condensed. / तापमान जिस पर किसी भी तरल पदार्थ की वाष्प घनी होती है
(d) The temperature at which all material in vapour form. / तापमान जिस पर सभी पदार्थ वाष्प रूप में होते हैं.
Show Answer
Ans.(b)
Sol. Absolute zero is the lowest possible temperature at which point the atoms of a substance transmit no thermal energy. They are completely at rest. It is 0 degrees on the Kelvin scale, which translates to-273.15 degree Celsius.
Sol. Absolute zero is the lowest possible temperature at which point the atoms of a substance transmit no thermal energy. They are completely at rest. It is 0 degrees on the Kelvin scale, which translates to-273.15 degree Celsius.
Q15. Rectifiers convert _____.
रेक्टीफाइर्स _____ को रूपांतिरत करते हैं.
(a) high voltage to low voltage / उच्च वोल्टेज को कम वोल्टेज में
(b) low voltage to high voltage / कम वोल्टेज को उच्च वोल्टेज में
(c) AC to DC / AC को DC में
(d) DC to AC / DC को AC में
रेक्टीफाइर्स _____ को रूपांतिरत करते हैं.
(a) high voltage to low voltage / उच्च वोल्टेज को कम वोल्टेज में
(b) low voltage to high voltage / कम वोल्टेज को उच्च वोल्टेज में
(c) AC to DC / AC को DC में
(d) DC to AC / DC को AC में
Show Answer
Ans.(c)
Sol. A rectifier is an electrical device composed of one or more diodes that converts alternating current (AC) to direct current (DC).
Sol. A rectifier is an electrical device composed of one or more diodes that converts alternating current (AC) to direct current (DC).
