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. Einstein was honoured with Nobel Prize for :
आइंस्टीन को ______ के लिए नोबेल पुरस्कार से सम्मानित किया गया.
(a) Photoelectric Effect/ प्रकाश विद्युत प्रभाव
(b) Theory of Specific Heat /विशिष्ट गर्मी का सिद्धांत
(c) Special Theory of Relativity/ सापेक्षता के विशेष सिद्धांत
(d) Bose-Einstein Statistics / बोस-आइंस्टीन सांख्यिकी
Ans.(a)
Sol. The Noble Prize in Physics in 1921 was awarded to Albert Einstein for his services to Theoretical Physics and especially for his discovery of the “Law of the Photoelectric Effect”.
Sol. The Noble Prize in Physics in 1921 was awarded to Albert Einstein for his services to Theoretical Physics and especially for his discovery of the “Law of the Photoelectric Effect”.
Q2. Who is the discoverer of Penicillin?
पेनिसिलिन का आविष्कार किसने किया था?
(a) Alexander Graham Bell / अलेक्जेंडर ग्राहम बेल
(b) Alexander Fleming / अलेक्जेंडर फ्लेमिंग
(c) Christopher Macdonald/ क्रिस्टोफर मैकडोनाल्ड
(d) Albert Einstein / अल्बर्ट आइंस्टीन
Show Answer
Ans.(b)
Sol. Penicillin was discovered by Scottish scientist Alexander Fleming.
Q3. Ampere is the unit of- Sol. Penicillin was discovered by Scottish scientist Alexander Fleming.
एम्पियर किसकी इकाई है
(a) Voltage / विद्युत दाब
(b) Electric current / विद्युत प्रवाह
(c) Resistance / प्रतिरोध
(d) Power / शक्ति
Show Answer
Ans.(b)
Sol. Ampere is unit to measure electric current. If one Ampere current is flowing in any conducting wire, it means 6.28×1018 electrons are entering per second from one direction and same amount of electrons flows from the other end per second.
Sol. Ampere is unit to measure electric current. If one Ampere current is flowing in any conducting wire, it means 6.28×1018 electrons are entering per second from one direction and same amount of electrons flows from the other end per second.
Q4. One pikogram is equal to-
एक पिकोग्राम किसके बराबर है?
(a) 10(-6) gram / ग्राम
(b) 10(-9) gram / ग्राम
(c) 10(-12) gram / ग्राम
(d) 10 (-15) gram/ ग्राम
Show Answer
Ans.(c)
Sol. The smaller units of measuring mass are Milligram, Microgram, Pikogram and Femtogram.
1 Pikogram = 10-12 gram
Sol. The smaller units of measuring mass are Milligram, Microgram, Pikogram and Femtogram.
1 Pikogram = 10-12 gram
Q5. In fibre-optics communication, the signal travel in the form of-
फाइबर ऑप्टिक्स संचार में, सिग्नल किसके रूप में यात्रा करता है -
(a) Lightwave / प्रकाश तरंग
(b) Radio wave/ रेडियो तरंग
(c) Microwave/ माइक्रो तंरग
(d) Electric wave /विद्युत तरंग
Show Answer
Ans.(a)
Sol. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fibre.
Q6. “Endoscope” used by the doctors for examining the inside of patient’s stomach, works on the principle of- Sol. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fibre.
रोगी के पेट के अंदर जांच करने के लिए डॉक्टरों द्वारा "एन्डोस्कोप" का उपयोग किया जाता है, यह किस सिद्धांत पर कार्य करता है?
(a) Reflection of light / प्रकाश का प्रतिबिंब
(b) Dispersion of light / प्रकाश का फैलाव
(c) Refraction of light / प्रकाश का अपवर्तन
(d) Total internal reflection of light/ प्रकाश का कुल आंतरिक प्रतिबिंब
Show Answer
Ans.(d)
Sol. Endoscopes are widely used to examine the interior of a hollow organ or cavity of the body. They are based on the principle of total internal reflection within a fibre optic bundle of fibres.
Sol. Endoscopes are widely used to examine the interior of a hollow organ or cavity of the body. They are based on the principle of total internal reflection within a fibre optic bundle of fibres.
Q7. The reason of mirage is
मिराज का कारण है:
(a) Interference of light / प्रकाश का हस्तक्षेप
(b) Diffraction of light / प्रकाश का विवर्तन
(c) Polarization of light / प्रकाश का ध्रुवीकरण
(d) Total internal reflection of light / प्रकाश का कुल आंतरिक प्रतिबिंब
मिराज का कारण है:
(a) Interference of light / प्रकाश का हस्तक्षेप
(b) Diffraction of light / प्रकाश का विवर्तन
(c) Polarization of light / प्रकाश का ध्रुवीकरण
(d) Total internal reflection of light / प्रकाश का कुल आंतरिक प्रतिबिंब
Show Answer
Ans.(d)
Sol. The mirage is caused by the total internal reflection of light at layers of air of different densities. In Desert areas, the successive upper layer is denser than those below there. A ray of light coming from a distant object, like the top a tree gets refracted from a denser to a rare medium. Consequently, the refracted ray bends away from the normal until at a particular layer, the light is incident ray suffers total internal reflection and enters the eyes of the observer. It appears as if an inverted image of the tree.
Sol. The mirage is caused by the total internal reflection of light at layers of air of different densities. In Desert areas, the successive upper layer is denser than those below there. A ray of light coming from a distant object, like the top a tree gets refracted from a denser to a rare medium. Consequently, the refracted ray bends away from the normal until at a particular layer, the light is incident ray suffers total internal reflection and enters the eyes of the observer. It appears as if an inverted image of the tree.
Q8. The diamond appears lustrous because of :
हीरा चमकदार प्रतीत होता है क्योंकि:
(a) Interference of light/ प्रकाश का हस्तक्षेप
(b) Dispersion/ विक्षेपण
(c) Total Internal Reflection / कुल आंतरिक परावर्तन
(d) Scattering / फैलाव
हीरा चमकदार प्रतीत होता है क्योंकि:
(a) Interference of light/ प्रकाश का हस्तक्षेप
(b) Dispersion/ विक्षेपण
(c) Total Internal Reflection / कुल आंतरिक परावर्तन
(d) Scattering / फैलाव
Show Answer
Ans.(c)
Sol. The refractive index of diamond is very high. Diamond achieves brilliance partially from total internal reflection. It has been cut or designed in such a way that if light enters in-to, incident light strikes many of the internal surfaces. After many such reflections, the colour in the light are separated and hence seen individually.
Sol. The refractive index of diamond is very high. Diamond achieves brilliance partially from total internal reflection. It has been cut or designed in such a way that if light enters in-to, incident light strikes many of the internal surfaces. After many such reflections, the colour in the light are separated and hence seen individually.
Q9. The technique to integrate and mark the image of a three-Dimensional object is-
तीन-आयामी वस्तु की छवि को एकीकृत करने और चिह्नित करने के लिए तकनीक-
(a) Audiography /ऑडियोग्राफी
(b) Lexieography / कोशरचना
(c) Photography /फोटोग्राफी
(d) Holography /होलोग्रफ़ी
तीन-आयामी वस्तु की छवि को एकीकृत करने और चिह्नित करने के लिए तकनीक-
(a) Audiography /ऑडियोग्राफी
(b) Lexieography / कोशरचना
(c) Photography /फोटोग्राफी
(d) Holography /होलोग्रफ़ी
Show Answer
Ans.(d)
Sol. Holography is a technique of producing a three-dimensional image of an object.
Sol. Holography is a technique of producing a three-dimensional image of an object.
Q10. ‘Raman effect’ deals with the light rays passing through
‘रमन प्रभाव’ किसके मध्यम से गुजरने वाली प्रकाश किरणों पर आधारित है?
(a) Only fluids/केवल तरल
(b) Only prisms/केवल प्रिज्म
(c) Only diamonds/केवल हीरे
(d) All transparent medium/सभी पारदर्शी माध्यम
‘रमन प्रभाव’ किसके मध्यम से गुजरने वाली प्रकाश किरणों पर आधारित है?
(a) Only fluids/केवल तरल
(b) Only prisms/केवल प्रिज्म
(c) Only diamonds/केवल हीरे
(d) All transparent medium/सभी पारदर्शी माध्यम
Show Answer
Ans.(d)
Sol. Raman effect deals with the light rays passing through all transparent medium According to this, a beam of light traverses a dust-free transparent sample of a chemical compound, a small fraction of light emerges in directions other than that of the incident (incoming) beam.
Sol. Raman effect deals with the light rays passing through all transparent medium According to this, a beam of light traverses a dust-free transparent sample of a chemical compound, a small fraction of light emerges in directions other than that of the incident (incoming) beam.
Q11. A CD (Compact Disc) audio player uses a:
एक CD (कॉम्पैक्ट डिस्क) ऑडियो प्लेयर किसका उपयोग करता है:
(a) Quartz crystal / क्वार्ट्ज क्रिस्टल
(b) Titanium needle / टाइटेनियम सुई
(c) Laser beam / लेजर बीम
(d) Barium titanic ceramic / बेरियम टाटानिक सिरेमिक
एक CD (कॉम्पैक्ट डिस्क) ऑडियो प्लेयर किसका उपयोग करता है:
(a) Quartz crystal / क्वार्ट्ज क्रिस्टल
(b) Titanium needle / टाइटेनियम सुई
(c) Laser beam / लेजर बीम
(d) Barium titanic ceramic / बेरियम टाटानिक सिरेमिक
Show Answer
Ans.(c)
Sol. The lens used in CD player emit ultraviolet laser beams.
Sol. The lens used in CD player emit ultraviolet laser beams.
Q12. Television signals cannot be received beyond a certain distance because:
टेलिविज़न सिग्नल एक निश्चित दूरी से अधिक पर प्राप्त नहीं हो सकते हैं क्योंकि
(a) Signals are weak / सिग्नल कमजोर हैं
(b) Antenna is weak / ऐन्टेना कमजोर है
(c) Air absorbs signals / हवा सिग्नल को अवशोषित करती है
(d) The surface of the earth is curved / पृथ्वी की सतह घुमावदार है
टेलिविज़न सिग्नल एक निश्चित दूरी से अधिक पर प्राप्त नहीं हो सकते हैं क्योंकि
(a) Signals are weak / सिग्नल कमजोर हैं
(b) Antenna is weak / ऐन्टेना कमजोर है
(c) Air absorbs signals / हवा सिग्नल को अवशोषित करती है
(d) The surface of the earth is curved / पृथ्वी की सतह घुमावदार है
Show Answer
Ans.(d)
Sol. Television signals cannot be received beyond a certain distance because the surface of the earth is curved, due to this the signals moves further without hitting the earth’s surface.
Sol. Television signals cannot be received beyond a certain distance because the surface of the earth is curved, due to this the signals moves further without hitting the earth’s surface.
Q13. Pure water freezes at what temperature?
शुद्ध पानी किस तापमान पर जम जाता है?
(a) 47 F
(b) 32 F
(c) 0 F
(d) 19 F
शुद्ध पानी किस तापमान पर जम जाता है?
(a) 47 F
(b) 32 F
(c) 0 F
(d) 19 F
Show Answer
Ans.(b)
Sol. Water freezes at 32 degrees Fahrenheit, 0 degrees Celsius, 273.15 Kelvin.
Sol. Water freezes at 32 degrees Fahrenheit, 0 degrees Celsius, 273.15 Kelvin.
Q14. CT Scan is done by using-
CT स्कैन किसका उपयोग करके किया जाता है -
(a) Infra-red Rays/अवरक्त किरणों
(b) Ultrasonic Waves/अल्ट्रासोनिक किरणों
(c) Visible Light/ दृश्य प्रकाश
(d) X-Rays / एक्स-रे
CT स्कैन किसका उपयोग करके किया जाता है -
(a) Infra-red Rays/अवरक्त किरणों
(b) Ultrasonic Waves/अल्ट्रासोनिक किरणों
(c) Visible Light/ दृश्य प्रकाश
(d) X-Rays / एक्स-रे
Show Answer
Ans.(d)
Sol. CT scan or computed tomography are special x-rays tests that produce cross-sectional images of the body using x-rays and a computer.
Sol. CT scan or computed tomography are special x-rays tests that produce cross-sectional images of the body using x-rays and a computer.
Q15. As per the WHO, the safe noise level for a city is-
WHO के अनुसार, एक शहर के लिए सुरक्षित आवाज़ स्तर कितना है -
(a) 45 DB
(b) 50 DB
(c) 55 DB
(d) 60 DB
WHO के अनुसार, एक शहर के लिए सुरक्षित आवाज़ स्तर कितना है -
(a) 45 DB
(b) 50 DB
(c) 55 DB
(d) 60 DB
Show Answer
Ans.(a)
Sol. As per the WHO the safe noise level for a city is 45 decibel (DB).
Sol. As per the WHO the safe noise level for a city is 45 decibel (DB).
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