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 1,27,278 seats to be filled by the valid candidates. Opportunity is here but you have to welcome it with a provident strategy.
Q1. At which temperature density of water is maximum?
किस तापमान पर पानी का घनत्व अधिकतम है?
(a) 4°C
(b) 0°C
(c) –4°C
(d) –8°C
किस तापमान पर पानी का घनत्व अधिकतम है?
(a) 4°C
(b) 0°C
(c) –4°C
(d) –8°C
Ans.(a)
Sol. The volume of water is minimum at 4°C. Hence the density of water is maximum at 4°C.
Sol. The volume of water is minimum at 4°C. Hence the density of water is maximum at 4°C.
Q2. Who among the following developed the technology of underground nuclear explosion?
निम्नलिखित में से किसने भूमिगत परमाणु विस्फोट की तकनीक विकसित की थी?
(a) Dr. Homi J. Bhabha / डॉ. होमी जे भाभा
(b) Dr. Vikram Sarabhai / डॉ विक्रम साराभाई
(c) Dr. Raja Ramanna / डॉ राजा रमन्ना
(d) Dr. P.K. Iyengar / डॉ पी.के. आयंगर
Show Answer
Ans.(a)
Sol. Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian unclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R-process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
Sol. Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian unclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R-process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
Q3. Which among the following types of coal produces most heat per unit?
निम्नलिखित में से किस प्रकार का कोयला प्रति यूनिट अधिक ऊष्मा उत्पादित करता है?
(a) Coal / कोयला
(b) Lignite / लिग्नाइट
(c) Anthracite / एन्थ्रेसाइट
(d) Pit /पिट
Show Answer
Ans.(c)
Sol. Anthracite is a hard, compact variety of mineral coal that has a high luster. It has the highest carbon content, the fewest impurities, and the highest calorific content of all types of coals, which also include bituminous coal and lignite. Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 92.1% and 98%.
Sol. Anthracite is a hard, compact variety of mineral coal that has a high luster. It has the highest carbon content, the fewest impurities, and the highest calorific content of all types of coals, which also include bituminous coal and lignite. Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 92.1% and 98%.
Q4. Which among the following waves is used for communication by artificial satellites?
निम्नलिखित में से किस तरंग का उपयोग कृत्रिम उपग्रहों द्वारा संचार के लिए किया जाता है
(a) Micro waves / माइक्रोवेव
(b) Radio waves / रेडियो तरंगें
(c) A. M. /ए.एम
(d) Frequency of 1016 series/ 1016 श्रृंखला की आवृत्ति
Show Answer
Ans.(a)
Sol. For fixed (point-to-point) services, communications satellites provide a microwave radio relay technology complementary to that of communication cables. They are also used for mobile applications such as communications to ships, vehicles, planes and hand-held terminals, and for TV and radio broadcasting. Microwave technology is extensively used for point-to-point telecommunications (i.e., non broadcast uses). Microwaves are especially suitable for this use since they are more easily focused into narrow beams than radio waves, and also their comparatively higher frequencies allow broad bandwidth and high data flow.
Sol. For fixed (point-to-point) services, communications satellites provide a microwave radio relay technology complementary to that of communication cables. They are also used for mobile applications such as communications to ships, vehicles, planes and hand-held terminals, and for TV and radio broadcasting. Microwave technology is extensively used for point-to-point telecommunications (i.e., non broadcast uses). Microwaves are especially suitable for this use since they are more easily focused into narrow beams than radio waves, and also their comparatively higher frequencies allow broad bandwidth and high data flow.
Q5. What is found in frequency modulation?
आवृत्ति मॉडुलन में क्या पाया जाता है
(a) Fixed frequency / निश्चित आवृति
(b) Fixed dimension / निश्चित आयाम
(c) Change in frequency / आवृति में परिवर्तन
(d) Change in dimension only/ केवल आयाम में परिवर्तन
Show Answer
Ans.(c)
Sol. Frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency.
Sol. Frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency.
Q6. Photosynthesis using the invisible part of the sunlight is done by some-
सूर्य के प्रकाश के अदृश्य भाग का उपयोग कर प्रकाश संश्लेषण कुछ _______ द्वारा किया जाता है-
(a) Trees / पेड़
(b) Algae / शैवाल
(c) Bacteria / जीवाणु
(d) Fungi / कवक
Show Answer
Ans.(c)
Sol. The bacteria which are found at 400-8000 ft into the deep sea, for example green Sulphur bacteria, uses infrared radiations for photosynthesis to produce energy.
Sol. The bacteria which are found at 400-8000 ft into the deep sea, for example green Sulphur bacteria, uses infrared radiations for photosynthesis to produce energy.
Q7. Red light signal is used as a danger signal because-
रेड लाइट सिग्नल को खतरे के सिग्नल के रूप में प्रयोग किया जाता है क्योंकि-
(a) Red light is scattered least /लाल लाइट सबसे कम फेलती है.
(b) This is comfortable for eyes /यह आँखों के लिए आरामदायक होती है.
(c) It produces least chemical reaction / यह कम रासायनिक प्रतिक्रिया पैदा करती है.
(d) It is least absorbed in air / यह हवा में कम अवशोषित होती है.
रेड लाइट सिग्नल को खतरे के सिग्नल के रूप में प्रयोग किया जाता है क्योंकि-
(a) Red light is scattered least /लाल लाइट सबसे कम फेलती है.
(b) This is comfortable for eyes /यह आँखों के लिए आरामदायक होती है.
(c) It produces least chemical reaction / यह कम रासायनिक प्रतिक्रिया पैदा करती है.
(d) It is least absorbed in air / यह हवा में कम अवशोषित होती है.
Show Answer
Ans.(a)
Sol. The red light signal is used as a danger signal because it has the highest wavelength and scattered least.
Sol. The red light signal is used as a danger signal because it has the highest wavelength and scattered least.
Q8. Which one of the following colours is seen in the middle of a Rainbow?
इंद्रधनुष के बीच में निम्नलिखित में से कौन सा रंग देखा जाता है?
(a) Blue / नीला
(b) Green / हरा
(c) Red / लाल
(d) Yellow / पीला
इंद्रधनुष के बीच में निम्नलिखित में से कौन सा रंग देखा जाता है?
(a) Blue / नीला
(b) Green / हरा
(c) Red / लाल
(d) Yellow / पीला
Show Answer
Ans.(b)
Sol. The correct order of colors of the rainbow is Red, Orange, Yellow, Green, Blue, Indigo and Violet. Thus it is clear that ‘Green’ Color is seen in the middle of Rainbow (VIBGYOR).
Sol. The correct order of colors of the rainbow is Red, Orange, Yellow, Green, Blue, Indigo and Violet. Thus it is clear that ‘Green’ Color is seen in the middle of Rainbow (VIBGYOR).
Q9. In which direction the rainbow is seen at 12 noon?
12:00 बजे इंद्रधनुष किस दिशा में देखा जाता है?
(a) In the West / पश्चिम
(b) In the South / दक्षिण
(c) In the East / पूर्व
(d) It cannot be seen / देखा नहीं जा सकता है
12:00 बजे इंद्रधनुष किस दिशा में देखा जाता है?
(a) In the West / पश्चिम
(b) In the South / दक्षिण
(c) In the East / पूर्व
(d) It cannot be seen / देखा नहीं जा सकता है
Show Answer
Ans.(d)
Sol. A rainbow is located opposite to the sun; this explains why rainbow is not seen at 12 noon with the sun overhead.
Sol. A rainbow is located opposite to the sun; this explains why rainbow is not seen at 12 noon with the sun overhead.
Q10. Colour in a colour television is produced by a combination of three basic colours, they are:-
रंगीन टीवी में रंग किन तीन रंगों के संयोजन से निर्मित होते है-
(a) Red, blue and orange/ लाल, नीला और नारंगी
(b) Red, green and blue /लाल, हरा और नीला
(c) Red, yellow and green /लाल, पीला और हरा
(d) Red, green and brown/ लाल, हरा और भूरा
Show Answer
Ans.(b)
Sol. The cathode ray tube (CRT), which is used in colour television uses three different phosphors which emit red, green and blue light respectively. They are packed together in stripes or clusters called “triads”.
Sol. The cathode ray tube (CRT), which is used in colour television uses three different phosphors which emit red, green and blue light respectively. They are packed together in stripes or clusters called “triads”.
Q11. A device which converts chemical energy into electrical energy is called-
एक उपकरण जो रासायनिक ऊर्जा को विद्युत ऊर्जा में परिवर्तित करता है उसे कहा जाता है
(a) Battery / बैटरी
(b) Motor / मोटर
(c) Generator / जनरेटर
(d) Moving coil meter / मूविंग कोइल मीटर
एक उपकरण जो रासायनिक ऊर्जा को विद्युत ऊर्जा में परिवर्तित करता है उसे कहा जाता है
(a) Battery / बैटरी
(b) Motor / मोटर
(c) Generator / जनरेटर
(d) Moving coil meter / मूविंग कोइल मीटर
Show Answer
Ans.(a)
Sol. An electrical battery is a device consisting of two or more electrochemical cell that converts stored chemical energy into electrical energy.
Sol. An electrical battery is a device consisting of two or more electrochemical cell that converts stored chemical energy into electrical energy.
Q12. The tolerable limit of noise for human being is around-
मानव के लिए शोर की सहनीय सीमा लगभग _____ है
(a) 45 decibel/डेसिबल
(b) 85 decibel/डेसिबल
(c) 125 decibel/डेसिबल
(d) 155 decibel/डेसिबल
मानव के लिए शोर की सहनीय सीमा लगभग _____ है
(a) 45 decibel/डेसिबल
(b) 85 decibel/डेसिबल
(c) 125 decibel/डेसिबल
(d) 155 decibel/डेसिबल
Show Answer
Ans.(b)
Sol. The sound of 50 decibel is enough to wake up a sleeping person. To remain continuously in the sound of 80 decibel proves to be harmful. 85 decibel is the maximum limit to tolerate any noise by human being.
Sol. The sound of 50 decibel is enough to wake up a sleeping person. To remain continuously in the sound of 80 decibel proves to be harmful. 85 decibel is the maximum limit to tolerate any noise by human being.
Q13. A fan produces feeling of comfort during hot weather, because-
एक पंखा गर्म मौसम के दौरान आराम की भावना पैदा करता है, क्योंकि -
(a) Fan supplies cold air/फैन ठंडी हवा की आपूर्ति करता है
(b) Our perspiration evaporates rapidly/आपका पसीना तेजी से सुखा देता है
(c) Our body radiates more heat/हमारे शरीर से अधिक गर्मी प्रसारित करता है
(d) Conductivity of air increase/वायु के प्रवाह में वृद्धि होती है
Show Answer
Ans.(b)
Sol. In summer, a ceiling fan in the counterclockwise direction can help to cool your home by pushing cool air down. During the hot summer months, though this wind chill effect can work to your advantage by providing a breeze that can help evaporate the skin’s moisture quickly, creating a cool feeling.
Sol. In summer, a ceiling fan in the counterclockwise direction can help to cool your home by pushing cool air down. During the hot summer months, though this wind chill effect can work to your advantage by providing a breeze that can help evaporate the skin’s moisture quickly, creating a cool feeling.
Q14. When water is heated from 0°C to 10°C. It’s volume:
जब पानी को 0 डिग्री सेल्सियस से 10 डिग्री सेल्सियस तक गर्म किया जाता है तो इसका आयतन:
(a) Increases/बढ़ता है
(b) Decreases/घटता है
(c) Does not change/अपरिवर्तित रहता है
(d) First decreases and then increases/पहले घटता है और फिर बढ़ता है
जब पानी को 0 डिग्री सेल्सियस से 10 डिग्री सेल्सियस तक गर्म किया जाता है तो इसका आयतन:
(a) Increases/बढ़ता है
(b) Decreases/घटता है
(c) Does not change/अपरिवर्तित रहता है
(d) First decreases and then increases/पहले घटता है और फिर बढ़ता है
Show Answer
Ans.(d)
Sol. When water is heated from 0°C to 4°C, then there is a decrease in volume and increases in density but when we cross the limit of 4°C its volume increases and density decreases. Thus, when water is heated from 0°C to 10°C, it’s volume first decreases and then increases.
Sol. When water is heated from 0°C to 4°C, then there is a decrease in volume and increases in density but when we cross the limit of 4°C its volume increases and density decreases. Thus, when water is heated from 0°C to 10°C, it’s volume first decreases and then increases.
Q15. Principle of fuse is / फ्यूज का सिद्धांत है
(a) Chemical effect of electricity / विद्युत का रासायनिक प्रभाव
(b) Mechanical effect of electricity / विद्युत का यांत्रिक प्रभाव
(c) Heating effect of electricity / विद्युत का तापीय प्रभाव
(d) Magnetic effect of electricity / विद्युत का चुंबकीय प्रभाव
(a) Chemical effect of electricity / विद्युत का रासायनिक प्रभाव
(b) Mechanical effect of electricity / विद्युत का यांत्रिक प्रभाव
(c) Heating effect of electricity / विद्युत का तापीय प्रभाव
(d) Magnetic effect of electricity / विद्युत का चुंबकीय प्रभाव
Show Answer
Ans.(c)
Sol.The electric fuse works on the principle of the heating effect of electric current. It consists of a piece of wire made of a metal or an alloy of low melting point. As the current increases beyond a limit, the wire in the electric fuse melts and breaks off.
Sol.The electric fuse works on the principle of the heating effect of electric current. It consists of a piece of wire made of a metal or an alloy of low melting point. As the current increases beyond a limit, the wire in the electric fuse melts and breaks off.
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