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 90,000 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 90,000 सीटों को वैध उम्मीदवारों द्वारा भरा जाएगा. आपके पास बहुत अच्छा अवसर है और आपको इसे एक बेहतर रणनीति से प्राप्त करना होगा.
Q1. For 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
S1. 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.
Q2. 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
Show Answer
S2. 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.
Q3. The principle reason why it is better to have two eyes than one is that:
एक आँख की तुलना में दो आँखें बेहतर क्यों है:
(a) By having two eyes we can distinguish colour easily / दो आँखें होने से हम आसानी से रंगों में पहचान कर सकते हैं
(b) By having two eyes we can easily see in the dark as well in dim light/ दो आँखें होने से हम आसानी से अंधेरे के साथ साथ मंद प्रकाश में भी देख सकते हैं
(c) It gives a man a type of vision known as mosaic vision/ यह एक आदमी को मोज़ेक दृष्टि के रूप में जाना जाने वाला एक प्रकार का दृष्टिकोण देता है
(d) It enhances distance and depth perception in us/ यह हमारी दूरी और गहराई की समझ को बढ़ाता है
Show Answer
S3. Ans.(d)
Sol. Human beings have stereoscopic vision (stereopsis) means having eyes at the front of their head. The two eyes are a few centimeters apart from each other. Due to this, two eyes see the same object from two slightly different angles and send two slightly different images to the brain. The brain combines these two images to build a three-dimensional picture of the object and we can judge the depth and distance of the object more accurately.
Sol. Human beings have stereoscopic vision (stereopsis) means having eyes at the front of their head. The two eyes are a few centimeters apart from each other. Due to this, two eyes see the same object from two slightly different angles and send two slightly different images to the brain. The brain combines these two images to build a three-dimensional picture of the object and we can judge the depth and distance of the object more accurately.
Q4. सूर्य ग्रहण के दौरान सूर्य को प्रत्यक्ष देखने से आँखों को अपरिवर्तनीय क्षति हो सकती है. रेटिना बर्न सूर्य की किरणों के निम्नलिखित में से किस घटक के कारण होता है?
Direct viewing of sun during total solar eclipse causes irreversible damage to eyes. The retinal burn is caused by which one of the following components of the sun rays?
(a) Heat / ऊष्मा
(b) Rainbow light / इंद्रधनुष प्रकाश
(c) Ultra-violet light / पराबैगनी प्रकाश
(d) Infra-red light / अवरक्त किरणे
Show Answer
S4. Ans.(c)
Sol. The only time that the sun can be viewed with the naked eye is during a total eclipse when the moon completely covers the disk of the sun. But it is never safe to look at a partial or annular eclipse or the partial phases of a total solar eclipse without proper equipment and techniques. Failure to use proper observing method may result in permanent eye damage or severe visual loss caused by the ultraviolet (UV) radiations of a higher wavelength.
Sol. The only time that the sun can be viewed with the naked eye is during a total eclipse when the moon completely covers the disk of the sun. But it is never safe to look at a partial or annular eclipse or the partial phases of a total solar eclipse without proper equipment and techniques. Failure to use proper observing method may result in permanent eye damage or severe visual loss caused by the ultraviolet (UV) radiations of a higher wavelength.
Q5. If in a motion, the axis of the rotation passes through an object, the motion is called _________.
यदि एक गति में, घृणन का अक्ष वस्तु के माध्यम से गुजरता है, तो गति को __________ कहा जाता है.
(a) Orbital motion / कक्षीय गति
(b) Circulatory motion/ परिसंचरण गति
(c) Spin motion/ घृणन गति
(d) Oscillatory motion/ ओस्लोलेटरी गति
Show Answer
S5. Ans.(c)
Sol. In physics, spin is the velocity of rotation of something around a particular axis.
Sol. In physics, spin is the velocity of rotation of something around a particular axis.
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
S6. 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.
Red light signal is used as a danger signal because-
(a) Red light is scattered least / रेड लाइट कम से कम फैलती हैं
(b) This is comfortable for eyes / यह आंखों के लिए सहज है
(c) It produces least chemical reaction /यह कम से कम रासायनिक प्रतिक्रिया उत्पन्न करता है
(d) It is least absorbed in air / यह हवा में कम से कम अवशोषित होता है
Show Answer
S7. 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.
Which one of the following colours is seen in the middle of a Rainbow?
(a) Blue / नीला
(b) Green / हरा
(c) Red / लाल
(d) Yellow / पीला
Show Answer
S8. 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).
In which direction the rainbow is seen at 12 noon?
(a) In the West / पश्चिम में
(b) In the South / दक्षिण में
(c) In the East / पूर्व में
(d) It cannot be seen / यह नहीं देखा जा सकता है.
Show Answer
S9. 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. Who invented the nuclear reactor?
परमाणु रिएक्टर का आविष्कार किसने किया?
(a) Enrico Fermi /एनरिको फर्मी
(b) Adolf Gaston Eugen Fick / एडॉल्फ गेस्टोन यूजीन फिक
(c) Sandford Fleming / सैंडफोर्ड फ्लेमिंग
(d) Benoit Fourneyron / बेनोइट फोरनेरोन
Show Answer
S10. Ans.(a)
Sol. Enrico Fermi was an Italian-American physicist and the creator of the world's first nuclear reactor, the Chicago Pile-1. He has been called the "architect of the nuclear age" and the "architect of the atomic bomb".
Sol. Enrico Fermi was an Italian-American physicist and the creator of the world's first nuclear reactor, the Chicago Pile-1. He has been called the "architect of the nuclear age" and the "architect of the atomic bomb".
पानी की सतह पर लोहे की सुई को धीरे-धीरे रखने पर वह क्यों तैरती है
(a) It will remain under the water, when it will displaced more water than its weight / यह पानी के नीचे तब तक रहेगी, जब तक यह अपने भार से अधिक पानी विस्थापित करेगी
(b) the density of needle is less than that of water / सुई का घनत्व पानी की तुलना में कम है
(c) due to surface tension / सतह तनाव के कारण
(d) due to its shape / इसके आकार के कारण
Show Answer
S11. Ans.(c)
Sol. According to Archimedes principle and we can note that the amount of water displaced by a needle is lesser than the amount of water moved out by the needle (that is displacement of the needle). So the needle initially stays on the surface of the water and then sinks into the water. Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
Sol. According to Archimedes principle and we can note that the amount of water displaced by a needle is lesser than the amount of water moved out by the needle (that is displacement of the needle). So the needle initially stays on the surface of the water and then sinks into the water. Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
Q12. Which one of the following is the best conductor of electricity?
निम्नलिखित में से कौन विद्युत का सर्वश्रेष्ठ सुचालक है?
(a) Mica / मैका
(b) Copper / कॉपर
(c) Gold / गोल्ड
(d) Silver / सिल्वर
निम्नलिखित में से कौन विद्युत का सर्वश्रेष्ठ सुचालक है?
(a) Mica / मैका
(b) Copper / कॉपर
(c) Gold / गोल्ड
(d) Silver / सिल्वर
Show Answer
S12. Ans.(d)
Sol. Electrical conductivity is a measure of the amount of electrical current under a material can carry. The most electrically conductive element is silver.
Sol. Electrical conductivity is a measure of the amount of electrical current under a material can carry. The most electrically conductive element is silver.
Q13. Which is not used as Atomic fuel?
इनमें से क्या परमाणु ईंधन के रूप में प्रयोग नहीं किया जाता है?
(a) Uranium / यूरेनियम
(b) Thorium/ थोरियम
(c) Plutonium / प्लूटोनियम
(d) Lead /लेड
इनमें से क्या परमाणु ईंधन के रूप में प्रयोग नहीं किया जाता है?
(a) Uranium / यूरेनियम
(b) Thorium/ थोरियम
(c) Plutonium / प्लूटोनियम
(d) Lead /लेड
Show Answer
S13. Ans.(d)
Sol. The most common nuclear fuels are uranium – 235 (235U) and plutonium -239(239Pu). Thorium is more abundant in nature than uranium. Thorium can be used as a nuclear fuel through breeding to uranium-233 (U-233). Lead is not used as a nuclear fuel.
Sol. The most common nuclear fuels are uranium – 235 (235U) and plutonium -239(239Pu). Thorium is more abundant in nature than uranium. Thorium can be used as a nuclear fuel through breeding to uranium-233 (U-233). Lead is not used as a nuclear fuel.
Q14. 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
Show Answer
S14. 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.
एक किलोवाट घंटा किसके बराबर है
(a) 3.6 Mega Joule / मेगाजूल
(b) 3.8 Mega Joule / मेगाजूल
(c) 3.2 Mega Joule / मेगाजूल
(d) 4.0 Mega Joule / मेगाजूल
Show Answer
S15. Ans. (a)
Sol. The energy 1 kilowatt-hour (kWh) is 3600000 joules or 3.6 mega joule. In physics, energy is an indirectly observed quantity that is often understood as the ability of a physical system to do work on other physical systems. However, this must be understood as an overly simplified definition, as the laws of thermodynamics demonstrate that not all energy can perform work.
Sol. The energy 1 kilowatt-hour (kWh) is 3600000 joules or 3.6 mega joule. In physics, energy is an indirectly observed quantity that is often understood as the ability of a physical system to do work on other physical systems. However, this must be understood as an overly simplified definition, as the laws of thermodynamics demonstrate that not all energy can perform work.
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