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 gas used in discharge tubes for optical decoration and advertising is-
ऑप्टिकल सजावट और विज्ञापन के लिए निर्वहन ट्यूबों में कौन सी गैस उपयोग होती है-
(a) Carbon dioxide/ कार्बन डाइआक्साइड
(b) Ammonia / अमोनिया
(c) Sulphur dioxide / सल्फर डाइऑक्साइड
(d) Neon / नियोन
Ans.(d)
Sol. The neon gas is used in discharge lamps, tubes and in fluorescent bulbs.
Sol. The neon gas is used in discharge lamps, tubes and in fluorescent bulbs.
Q2. The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon- साबुन के पतले फोम में चमकदार रंगों का गठन निम्न में से किस घटना का परिणाम है-
(a) Reflection and interference / प्रतिबिंब और हस्तक्षेप
(b) Total refraction and dispersion / कुल अपवर्तन और फैलाव
(c) Diffraction and dispersion / विच्छेदन और फैलाव
(d) Polarization and interference / ध्रुवीकरण और हस्तक्षेप
Show Answer
Ans.(a)
Sol. A soap bubble is a very thin sheet of water sandwiched between two layers of soap molecules. Light is reflected from both the inner and outer surface of the soap bubble. The resulting colors are a combination of the colors that do not undergo destructive interference and their degrees of constructive interference. Blue-green colors dominate in thicker films and yellow hues in thinner films.
Sol. A soap bubble is a very thin sheet of water sandwiched between two layers of soap molecules. Light is reflected from both the inner and outer surface of the soap bubble. The resulting colors are a combination of the colors that do not undergo destructive interference and their degrees of constructive interference. Blue-green colors dominate in thicker films and yellow hues in thinner films.
Q3. Total internal reflection can take place when light travels from:
कुल आंतरिक प्रतिबिंब तब हो सकता है जब प्रकाश ________ से यात्रा कर रहा है:
(a) Diamond to glass /डायमंड से कांच
(b) Water to glass / ग्लास से पानी
(c) Air to water / पानी से हवा
(d) Air to glass / ग्लास से हवा
Show Answer
Ans.(a)
Sol. Total internal reflection takes place when a ray of light is travelling from denser to thinner medium and angle of incidence is greater than the critical angle, the ray is completely reflected from the surface and meet each other as if the surface is a mirror. So according to options, the situation of option (a) is correct where total internal reflection takes place, it is because diamond is denser than glass.
Sol. Total internal reflection takes place when a ray of light is travelling from denser to thinner medium and angle of incidence is greater than the critical angle, the ray is completely reflected from the surface and meet each other as if the surface is a mirror. So according to options, the situation of option (a) is correct where total internal reflection takes place, it is because diamond is denser than glass.
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
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
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. Fathometer is used to measure:
फाथोमीटर का उपयोग __________मापने के लिए किया जाता है
(a) Earthquake / भूकंप
(b) Rain / वृष्टि
(c) Depth of sea / समुद्र की गहराई
(d) Sound intensity / ध्वनि तीव्रता
Show Answer
Ans.(c)
Sol. Fathometer is an instrument used to determine the depth of water or a submerged object by means of ultrasound waves.
Sol. Fathometer is an instrument used to determine the depth of water or a submerged object by means of ultrasound waves.
Q7. Which instrument is used to measure sound under water ?
पानी के नीचे की ध्वनि को मापने के लिए किस उपकरण का उपयोग किया जाता है?
(a) Hygrometer / हाइग्रोमीटर
(b) Hygroscope / हाइग्रोस्कोप
(c) Hypsometer / हाइपोमीटर
(d) Hydrophone/ हाइड्रोफोन
पानी के नीचे की ध्वनि को मापने के लिए किस उपकरण का उपयोग किया जाता है?
(a) Hygrometer / हाइग्रोमीटर
(b) Hygroscope / हाइग्रोस्कोप
(c) Hypsometer / हाइपोमीटर
(d) Hydrophone/ हाइड्रोफोन
Show Answer
Ans.(d)
Sol. A hydrophone is a microphone designed to be used underwater for recording or listening to underwater sound
Sol. A hydrophone is a microphone designed to be used underwater for recording or listening to underwater sound
Q8. Diffusion of light in the atmosphere takes place due to:
वायुमंडल में प्रकाश का प्रसार_____ के कारण होता है:
(a) Carbon dioxide / कार्बन डाइआक्साइड
(b) Dust particles / धूल कणों
(c) Helium / हीलियम
(d) Water vapours / जल वाष्प
वायुमंडल में प्रकाश का प्रसार_____ के कारण होता है:
(a) Carbon dioxide / कार्बन डाइआक्साइड
(b) Dust particles / धूल कणों
(c) Helium / हीलियम
(d) Water vapours / जल वाष्प
Show Answer
Ans.(b)
Sol. Sunlight is the mixture of different colours. When it passes through the atmosphere it is scattered by the air molecules, particles of dust and other subtle materials which are present in the pathway.
Sol. Sunlight is the mixture of different colours. When it passes through the atmosphere it is scattered by the air molecules, particles of dust and other subtle materials which are present in the pathway.
Q9. The energy of wind is-
हवा की ऊर्जा है-
(a) Only potential / केवल संभावित
(b) Only kinetic केवल गतिशील
(c) Electrical / विद्युतीय
(d) Potential and kinetic both / संभावित और गतिशील दोनों
हवा की ऊर्जा है-
(a) Only potential / केवल संभावित
(b) Only kinetic केवल गतिशील
(c) Electrical / विद्युतीय
(d) Potential and kinetic both / संभावित और गतिशील दोनों
Show Answer
Ans.(b)
Sol. The kinetic energy in the energy in moving objects or mass. The kinetic energy of the wind (wind energy) can be converted into electrical or mechanical energy.
Sol. The kinetic energy in the energy in moving objects or mass. The kinetic energy of the wind (wind energy) can be converted into electrical or mechanical energy.
Q10. When a mirror is rotated by an angle θ, the reflected ray will rotate by:
जब एक दर्पण को कोण θ द्वारा घुमाया जाता है, तो परिलक्षित किरण____घूमती है:
(a) 0
(b) θ/2
(c) θ
(d) 2θ
Show Answer
Ans.(d)
Sol. If a plane mirror is rotated through a certain angle, then the reflected ray rotates through twice of that angle. So if a mirror is rotated by an angle θ, the reflected ray will rotate by 2θ.
Sol. If a plane mirror is rotated through a certain angle, then the reflected ray rotates through twice of that angle. So if a mirror is rotated by an angle θ, the reflected ray will rotate by 2θ.
Q11. ‘Raman effect’ deals with the light rays passing through/'रमन प्रभाव' में ____से गुजरने वाली प्रकाश किरणों का वर्णन है:
(a) Only fluids / केवल तरल पदार्थ
(b) Only prisms / केवल प्रिज्म
(c) Only diamonds / केवल हीरे
(d) All transparent medium/ सभी पारदर्शी माध्यम
(a) Only fluids / केवल तरल पदार्थ
(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.
Q12. 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.
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
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
Ans.(b)
Sol. Frequency modulation is used to transmit audio signals in television broadcasts. Frequency Modulation is the process in which the frequency of the carrier signal is varied by the modulating signal while the amplitude remains constant
Sol. Frequency modulation is used to transmit audio signals in television broadcasts. Frequency Modulation is the process in which the frequency of the carrier signal is varied by the modulating signal while the amplitude remains constant
Q15. Which one of the following does a TV remote control unit use to operate a TV set?
निम्नलिखित में से किसके उपयोग से टीवी रिमोट कंट्रोल यूनिट एक टीवी सेट को संचालित करता है?
(a) Light waves / प्रकाश तरंगें
(b) Sound saves / ध्वनि तरंगें
(c) Microwaves / माइक्रोवेव
(d) Radio waves / रेडियो तरंगें
निम्नलिखित में से किसके उपयोग से टीवी रिमोट कंट्रोल यूनिट एक टीवी सेट को संचालित करता है?
(a) Light waves / प्रकाश तरंगें
(b) Sound saves / ध्वनि तरंगें
(c) Microwaves / माइक्रोवेव
(d) Radio waves / रेडियो तरंगें
Show Answer
Ans.(d)
Sol. Infrared waves are used to transmit radio and TV signals but some of them are using radio waves. Infrared is an electromagnetic radiation.
Sol. Infrared waves are used to transmit radio and TV signals but some of them are using radio waves. Infrared is an electromagnetic radiation.
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