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. The time taken to reach the Sunlight up to the surface of earth is approximately-
सूर्य के प्रकाश को पृथ्वी की सतह तक पहुचने में लगभग कितना समय लगता है?
(a) 4.2 sec /4.2 सेकेंड
(b) 4.8 sec /4.8 सेकंड
(c) 8.5 minutes/ 8.5 मिनट
(d) 3.6 hrs. /3.6 घंटे
S1. Ans.(c)
Sol. The sunlight takes about 500 second or 8.5 minutes to reach to the earth.
Sol. The sunlight takes about 500 second or 8.5 minutes to reach to the earth.
Q2. What was the fissionable material used in the bombs dropped at Nagasaki (Japan) in the year 1945?
वर्ष 1945 में नागासाकी (जापान) में गिराए गए बमों में इस्तेमाल होने वाली विखंडनीय सामग्री क्या थी?
(a) Sodium / सोडियम
(b) Potassium / पोटैशियम
(c) Plutonium /प्लूटोनियम
(d) Iron/लोहा
Show Answer
S2. Ans.(c)
Sol. ‘Fat Man’ was the code name for the type of bomb which was dropped on the Japanese city of Nagasaki by the United States of America. Plutonium was used as fissionable material in this bomb.
Sol. ‘Fat Man’ was the code name for the type of bomb which was dropped on the Japanese city of Nagasaki by the United States of America. Plutonium was used as fissionable material in this bomb.
Q3. GPS stands for which one of the following?
निम्नलिखित में से GPS का पूर्ण रूप क्या है?
(a) Greenwich Polar Satellite
(b) Global Police Surveillance
(c) Global Positioning System
(d) General Pacific Survey
Show Answer
S3. Ans.(c)
Sol. GPS means Global Positioning System, is a space-based navigation system. It was developed by the U.S. Department of defence.
Sol. GPS means Global Positioning System, is a space-based navigation system. It was developed by the U.S. Department of defence.
Q4. Optical fibre works on the principle of:
ऑप्टिकल फाइबर ______ के सिद्धांत पर कार्य करती है.
(a) Total internal reflection / कुल आंतरिक प्रतिबिंब
(b) Refraction / अपवर्तन
(c) Scattering / बिखरने
(d) Interference / इंटरफेरेंस
Show Answer
S4. Ans.(a)
Sol. The optical fibre is a very him strand of glass or plastic cable for transmitting light from one point to another. They work on the principle of total internal reflection. There is no loss of signal through an optical fibre.
Sol. The optical fibre is a very him strand of glass or plastic cable for transmitting light from one point to another. They work on the principle of total internal reflection. There is no loss of signal through an optical fibre.
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
S5. 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.
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-
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
S6. 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
S7. 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
S8. 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
S9. Ans.(d)
Sol. Holography is a technique of producing a three-dimensional image of an object. Holography can work with sound, light or any wavelength. Holography is popularly used for preserving the transcripts and for Microfiche (a flat piece of film containing microphotograph of the pages of newspaper, catalogue or other). It is also been for three-dimensional natural films.
Sol. Holography is a technique of producing a three-dimensional image of an object. Holography can work with sound, light or any wavelength. Holography is popularly used for preserving the transcripts and for Microfiche (a flat piece of film containing microphotograph of the pages of newspaper, catalogue or other). It is also been for three-dimensional natural films.
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
S10. 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. From reproducing sound, a CD (Compact Disc) audio player uses a:
प्रतिलिपि ध्वनि के लिए, एक CD (कॉम्पैक्ट डिस्क) ऑडियो प्लेयर किसका उपयोग करता है:
(a) Quartz / क्वार्ट्ज
(b) Titanium needle / टाइटेनियम सुई
(c) Laser beam / लेजर बीम
(d) Barium titanic ceramic / बेरियम टाटानिक सिरेमिक
प्रतिलिपि ध्वनि के लिए, एक CD (कॉम्पैक्ट डिस्क) ऑडियो प्लेयर किसका उपयोग करता है:
(a) Quartz / क्वार्ट्ज
(b) Titanium needle / टाइटेनियम सुई
(c) Laser beam / लेजर बीम
(d) Barium titanic ceramic / बेरियम टाटानिक सिरेमिक
Show Answer
S11. Ans.(c)
Sol. The lens used in CD player emit ultraviolet laser beams which produce sound after reflecting through the bright surface of C.D.
Sol. The lens used in CD player emit ultraviolet laser beams which produce sound after reflecting through the bright surface of C.D.
Q12. When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow-like colours is seen. This can be explained on the basis of the phenomenon of :
जब एक सीडी (ऑडियो और वीडियो सिस्टम में कॉम्पैक्ट डिस्क का उपयोग किया जाता है) सूरज की रोशनी में देखा जाता है, इंद्रधनुष जैसा रंग देखा जाता है। यह किस घटना के आधार पर समझाया जा सकता है:
(a) Reflection and diffraction / प्रतिबिंब और विवर्तन
(b) Reflection and transmission / प्रतिबिंब और संचरण
(c) Diffraction and transmission / विवर्तन और संचरण
(d) Refraction, diffraction, and transmission/ अपवर्तन, विवर्तन, और संचरण
जब एक सीडी (ऑडियो और वीडियो सिस्टम में कॉम्पैक्ट डिस्क का उपयोग किया जाता है) सूरज की रोशनी में देखा जाता है, इंद्रधनुष जैसा रंग देखा जाता है। यह किस घटना के आधार पर समझाया जा सकता है:
(a) Reflection and diffraction / प्रतिबिंब और विवर्तन
(b) Reflection and transmission / प्रतिबिंब और संचरण
(c) Diffraction and transmission / विवर्तन और संचरण
(d) Refraction, diffraction, and transmission/ अपवर्तन, विवर्तन, और संचरण
Show Answer
S12. Ans.(a)
Sol. When a CD is viewed in sunlight, rainbow-like colours is seen. To understand this phenomenon one has to understand the construction of CD. A CD is a circular disc coated with micro like aluminum or gold film which has another protective layer coating of clear plastic. It acts like a thin film, which is responsible for reflection and diffraction.
Sol. When a CD is viewed in sunlight, rainbow-like colours is seen. To understand this phenomenon one has to understand the construction of CD. A CD is a circular disc coated with micro like aluminum or gold film which has another protective layer coating of clear plastic. It acts like a thin film, which is responsible for reflection and diffraction.
Q13. 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
S13. 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.
Q14. The technique used to transmit auto signals in television broadcasts is :
टेलीविजन प्रसारण में ऑटो सिग्नल संचारित करने के लिए उपयोग की जाने वाली तकनीक है:
(a) Amplitude Modulation / आयाम मॉड्यूलन
(b) Frequency Modulation / आवृति मॉड्यूलन
(c) Pulse Code Modulation / पल्स कोड मॉड्यूलन
(d) Time Division Multiplexing / समय विभाजन बहुसंकेतन
टेलीविजन प्रसारण में ऑटो सिग्नल संचारित करने के लिए उपयोग की जाने वाली तकनीक है:
(a) Amplitude Modulation / आयाम मॉड्यूलन
(b) Frequency Modulation / आवृति मॉड्यूलन
(c) Pulse Code Modulation / पल्स कोड मॉड्यूलन
(d) Time Division Multiplexing / समय विभाजन बहुसंकेतन
Show Answer
S14. Ans.(b)
Sol. Frequency modulation is used to transmit audio signals in television broadcasts. Frequency modulated signals have larger bandwidth so that FM signals on the adjacent bands have neither noise nor interference issue.
Sol. Frequency modulation is used to transmit audio signals in television broadcasts. Frequency modulated signals have larger bandwidth so that FM signals on the adjacent bands have neither noise nor interference issue.
Q15. The image formed on Retina is :
रेटिना पर निर्मित प्रतिबिंब:
(a) Equal to object but inverted / वस्तु के बराबर लेकिन उल्टा
(b) Smaller than object but straight / वस्तु से छोटा लेकिन सीधा
(c) Smaller than object but inverted / वस्तु से छोटा लेकिन उल्टा
(d) Equal to object but straight / वस्तु के बराबर लेकिन सीधा
रेटिना पर निर्मित प्रतिबिंब:
(a) Equal to object but inverted / वस्तु के बराबर लेकिन उल्टा
(b) Smaller than object but straight / वस्तु से छोटा लेकिन सीधा
(c) Smaller than object but inverted / वस्तु से छोटा लेकिन उल्टा
(d) Equal to object but straight / वस्तु के बराबर लेकिन सीधा
Show Answer
S15. Ans.(c)
Sol. The image formed on Retina is real, inverted and smaller than the object. The signals for image formation are sent via the optic nerve to the brain, which ultimately processes the image and allows us to see. However, the image formed on Retina is inverted but on the basis of our experience, we see a straight image.
Sol. The image formed on Retina is real, inverted and smaller than the object. The signals for image formation are sent via the optic nerve to the brain, which ultimately processes the image and allows us to see. However, the image formed on Retina is inverted but on the basis of our experience, we see a straight image.
