General Science Questions for Railway 2018:
Dear Students,
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. The exam will be conducted in the months of April and May 2018.
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
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
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
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
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 and dimension / आवृति और आयाम में परिवर्तन
(d) Change in dimension only/ केवल आयाम में परिवर्तन
Q6. When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance?
जब कार की गति दोगुनी हो जाती है, तो समान दूरी पर इसे रोकने के लिए कार का ब्रेकिंग बल कितना होना चाहिए?
(a) four times /चार गुना
(b) two times /दो गुना
(c) half / आधा
(d) one-fourth /एक चौथाई
Q7. The dimension of which of the following is the same as that of impulse?
निम्नलिखित में से किस का आयाम आवेग के समान है?
(a) Volume /आयतन
(b) Momentum / संवेग
(c) Torque /टार्क
(d) Change in the rate of momentum / संवेग की दर में बदलाव
Q8. Which among the following is the fundamental quantity?
निम्नलिखित में से क्या एक मौलिक मात्रा है?
(a) Volume /आयतन
(b) Time /समय
(c) Velocity /वेग
(d) Force /बल
Q9. When a ring of metal is heated what happens to its hole?
जब एक धातु की अंगूठी गरम की जाती है तो उसके छिद्र का क्या होता है?
(a) expands / बढ़ जाता है
(b) contracts / कम हो जाता है
(c) it expands or contracts according to its diameter /इसके व्यास के अनुसार बढ़ता या कम हो जाता है
(d) it expands or contracts according to its coefficient of expansion / इसके विस्तार के गुणांक के अनुसार बढ़ता या कम हो जाता है
Q10. If the diameter of a capillary is doubled, then the rise of water in it will be
यदि केशिका का व्यास दोगुना हो, तो इसमें पानी की ऊंचाई कितनी होगी?
(a) two times /दोगुनी
(b) half /आधी
(c) four times / चार गुनी
(d) no change / कोई परिवर्तन नहीं
Q11. Why the needle of iron swims on water surface when it is kept gently?
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
Q12. The mass of a star is two times the mass of the Sun. How it will come to an end?
एक तारे का द्रव्यमान सूर्य के द्रव्यमान का दो गुना है. यह किस रूप में समाप्त हो जाएगा?
(a) Neutron Star / न्यूट्रॉन स्टार
(b) Black hole /ब्लैक होल
(c) White Dwarf / वाइट ड्वार्फ
(d) Red Giant / रेड जायंट
Q14. On which of the following techniques photostate machine works?
निम्नलिखित में से किस तकनीक पर फोटॉस्टेट मशीन कार्य करती है?
(a) Magnetic Image-Making / चुंबकीय छवि-निमार्ण
(b) Thermal Image-Making / तापीय छवि-निमार्ण
(c) Electrostatic Image-Making / इलेक्ट्रोस्टैटिक छवि-निमार्ण
(d) Electromagnetic Image-Making / विद्युतचुंबकीय छवि-निमार्ण
Q15. One Kilowatt hour is equal to-
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
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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. The exam will be conducted in the months of April and May 2018.
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. परीक्षा अप्रैल और मई 2018 के महीने में आयोजित की जायेगी.
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
Show Answer
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 and dimension / आवृति और आयाम में परिवर्तन
(d) Change in dimension only/ केवल आयाम में परिवर्तन
Show Answer
Ans.(a)
Sol. Frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant. Frequency modulation is known as phase modulation when the carrier phase modulation is the time integral of the FM signal. FM is widely used for broadcasting music and speech, two-way radio systems, magnetic tape recording systems and some video-transmission systems.
Sol. Frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant. Frequency modulation is known as phase modulation when the carrier phase modulation is the time integral of the FM signal. FM is widely used for broadcasting music and speech, two-way radio systems, magnetic tape recording systems and some video-transmission systems.
Q6. When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance?
जब कार की गति दोगुनी हो जाती है, तो समान दूरी पर इसे रोकने के लिए कार का ब्रेकिंग बल कितना होना चाहिए?
(a) four times /चार गुना
(b) two times /दो गुना
(c) half / आधा
(d) one-fourth /एक चौथाई
Show Answer
Ans.(a)
Sol. Brake force, also known as Brake Power, is a measure of braking power of a vehicle. Suppose a car whose mass is ‘x’ and is braked from a speed of y km/hr to come to halt at a uniform retardation in z min. If the speed of the car is doubled in the same distance, then the braking force required to stop the car is four times the original speed i.e. ‘4v’. Note that all the parameters remain to be same.
Sol. Brake force, also known as Brake Power, is a measure of braking power of a vehicle. Suppose a car whose mass is ‘x’ and is braked from a speed of y km/hr to come to halt at a uniform retardation in z min. If the speed of the car is doubled in the same distance, then the braking force required to stop the car is four times the original speed i.e. ‘4v’. Note that all the parameters remain to be same.
Q7. The dimension of which of the following is the same as that of impulse?
निम्नलिखित में से किस का आयाम आवेग के समान है?
(a) Volume /आयतन
(b) Momentum / संवेग
(c) Torque /टार्क
(d) Change in the rate of momentum / संवेग की दर में बदलाव
Show Answer
Ans.(b)
Sol. The quantity of impulse is force × time interval. In classical mechanics, linear momentum or translational momentum is the product of the mass and velocity of an object. For example, a heavy truck moving fast has a large momentum-it takes a large and prolonged force to get the truck up to this speed, and it takes a large and prolonged force to bring it to a stop afterwards. If the truck were lighter or moving slower, then it would have less momentum.
Sol. The quantity of impulse is force × time interval. In classical mechanics, linear momentum or translational momentum is the product of the mass and velocity of an object. For example, a heavy truck moving fast has a large momentum-it takes a large and prolonged force to get the truck up to this speed, and it takes a large and prolonged force to bring it to a stop afterwards. If the truck were lighter or moving slower, then it would have less momentum.
Q8. Which among the following is the fundamental quantity?
निम्नलिखित में से क्या एक मौलिक मात्रा है?
(a) Volume /आयतन
(b) Time /समय
(c) Velocity /वेग
(d) Force /बल
Show Answer
Ans.(b)
Sol. The fundamental qualities of Physics are the seven basic quantities that can be used to express all other physical quantities. These are as follows: Length: Metre, Heat: Kelvin, Time: second, Luminous Intensity: Candela, Mass: Kilogram, Electric Current: Ampere, and Amount of substance: Moles.
Sol. The fundamental qualities of Physics are the seven basic quantities that can be used to express all other physical quantities. These are as follows: Length: Metre, Heat: Kelvin, Time: second, Luminous Intensity: Candela, Mass: Kilogram, Electric Current: Ampere, and Amount of substance: Moles.
Q9. When a ring of metal is heated what happens to its hole?
जब एक धातु की अंगूठी गरम की जाती है तो उसके छिद्र का क्या होता है?
(a) expands / बढ़ जाता है
(b) contracts / कम हो जाता है
(c) it expands or contracts according to its diameter /इसके व्यास के अनुसार बढ़ता या कम हो जाता है
(d) it expands or contracts according to its coefficient of expansion / इसके विस्तार के गुणांक के अनुसार बढ़ता या कम हो जाता है
Show Answer
Ans.(a)
Sol. The hole size will increase because in expansion the size between two molecules do not increase so when the molecules on the outer edge move outward. Due to expansion, the size of the hole will also increase so as to compensate the distance change between the molecules. Thermal expansion is the tendency of matter to change in volume in response to a change in temperature. When a substance is heated, its particles begin moving more and thus usually maintain a greater average separation.
Sol. The hole size will increase because in expansion the size between two molecules do not increase so when the molecules on the outer edge move outward. Due to expansion, the size of the hole will also increase so as to compensate the distance change between the molecules. Thermal expansion is the tendency of matter to change in volume in response to a change in temperature. When a substance is heated, its particles begin moving more and thus usually maintain a greater average separation.
Q10. If the diameter of a capillary is doubled, then the rise of water in it will be
यदि केशिका का व्यास दोगुना हो, तो इसमें पानी की ऊंचाई कितनी होगी?
(a) two times /दोगुनी
(b) half /आधी
(c) four times / चार गुनी
(d) no change / कोई परिवर्तन नहीं
Show Answer
Ans.(b)
Sol. Radius of a capillary tube is inversely proportional to the height of the liquid column. So, if radius of the tube is doubled, rise of level of water will becomes half of the previous rise of level of water will becomes half of the previous rise in capillary tube. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity. The effect can be seen in the drawing up of liquids between the hairs of a paint-brush, in a thin tube, in porous materials such as paper, in some non-porous materials such as liquefied carbon fiber, or in a cell. It occurs because of inter-molecular attractive forces between the liquid and solid surrounding surfaces.
Sol. Radius of a capillary tube is inversely proportional to the height of the liquid column. So, if radius of the tube is doubled, rise of level of water will becomes half of the previous rise of level of water will becomes half of the previous rise in capillary tube. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity. The effect can be seen in the drawing up of liquids between the hairs of a paint-brush, in a thin tube, in porous materials such as paper, in some non-porous materials such as liquefied carbon fiber, or in a cell. It occurs because of inter-molecular attractive forces between the liquid and solid surrounding surfaces.
Q11. Why the needle of iron swims on water surface when it is kept gently?
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
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. The mass of a star is two times the mass of the Sun. How it will come to an end?
एक तारे का द्रव्यमान सूर्य के द्रव्यमान का दो गुना है. यह किस रूप में समाप्त हो जाएगा?
(a) Neutron Star / न्यूट्रॉन स्टार
(b) Black hole /ब्लैक होल
(c) White Dwarf / वाइट ड्वार्फ
(d) Red Giant / रेड जायंट
Show Answer
Ans.(a)
Sol. The mass of a star which is two times the mass of the sun turns into a neutron star. A neutron star is a type of stellar remnat that can result from the gravitational collapse of a massive star during a Type II, Type Ib or Type Ic supernova event. Such stars are composed almost entirely of neutrons, which are subatomic particles without electrical charge and with slightly larger mass than protons. Neutron stars are very hot and are supported against further collapse by quantum degeneracy pressure due to the Pauli’s exclusion principle. This principle states that no two neutrons (or any other fermionic particles) can occupy the same place and quantum state simultaneously. A typical neutron star has mass between about 1.4 and 3.2 solar masses (Chandrasekhar Limit), with a corresponding radius of about 12 km if the Akmal-Pandharipande-Ravenhall equation of state (APR EOS) is used.
Sol. The mass of a star which is two times the mass of the sun turns into a neutron star. A neutron star is a type of stellar remnat that can result from the gravitational collapse of a massive star during a Type II, Type Ib or Type Ic supernova event. Such stars are composed almost entirely of neutrons, which are subatomic particles without electrical charge and with slightly larger mass than protons. Neutron stars are very hot and are supported against further collapse by quantum degeneracy pressure due to the Pauli’s exclusion principle. This principle states that no two neutrons (or any other fermionic particles) can occupy the same place and quantum state simultaneously. A typical neutron star has mass between about 1.4 and 3.2 solar masses (Chandrasekhar Limit), with a corresponding radius of about 12 km if the Akmal-Pandharipande-Ravenhall equation of state (APR EOS) is used.
Q13. Rain drops fall from great height. Which among the following statements is true regarding it?
बारिश की बूंदें अधिक ऊंचाई से गिरती हैं. निम्नलिखित में से कौन सा कथन इस संदर्भ में सत्य है?
(a) they fall with that ultimate velocity, which are different for different droplets / वे उस वेग से गिरते हैं, जो हर बूंद के लिए भिन्न है
(b) the fall with same ultimate velocity /वह समान वेग से गिरती है
(c) their velocity increases and they fall with different velocity on the earth /उनका वेग बढ़ता है और वह भिन्न वेग से धरती पर गिरती है
(d) their velocity increases and they fall with same velocity on the earth /उनका वेग बढ़ता है और वह समान वेग से धरती पर गिरती है
बारिश की बूंदें अधिक ऊंचाई से गिरती हैं. निम्नलिखित में से कौन सा कथन इस संदर्भ में सत्य है?
(a) they fall with that ultimate velocity, which are different for different droplets / वे उस वेग से गिरते हैं, जो हर बूंद के लिए भिन्न है
(b) the fall with same ultimate velocity /वह समान वेग से गिरती है
(c) their velocity increases and they fall with different velocity on the earth /उनका वेग बढ़ता है और वह भिन्न वेग से धरती पर गिरती है
(d) their velocity increases and they fall with same velocity on the earth /उनका वेग बढ़ता है और वह समान वेग से धरती पर गिरती है
Show Answer
Ans.(a)
Sol. Any mass is attracted to the Earth by the pull of gravity. Gravity accelerates all objects towards the ground at a specific rate. Without any other forces present, the speed of an object in free fall will increase the farther or longer it falls. And lastly, it depends upon the speed of the object. At low speeds the object’s resistance is directly proportional to speed, and at higher speeds the object’s resistance is proportional to its speed squared. Most objects falling through the air would be considered to be moving at a higher speed, even though that speed might not be great compared to some velocities.
Sol. Any mass is attracted to the Earth by the pull of gravity. Gravity accelerates all objects towards the ground at a specific rate. Without any other forces present, the speed of an object in free fall will increase the farther or longer it falls. And lastly, it depends upon the speed of the object. At low speeds the object’s resistance is directly proportional to speed, and at higher speeds the object’s resistance is proportional to its speed squared. Most objects falling through the air would be considered to be moving at a higher speed, even though that speed might not be great compared to some velocities.
Q14. On which of the following techniques photostate machine works?
निम्नलिखित में से किस तकनीक पर फोटॉस्टेट मशीन कार्य करती है?
(a) Magnetic Image-Making / चुंबकीय छवि-निमार्ण
(b) Thermal Image-Making / तापीय छवि-निमार्ण
(c) Electrostatic Image-Making / इलेक्ट्रोस्टैटिक छवि-निमार्ण
(d) Electromagnetic Image-Making / विद्युतचुंबकीय छवि-निमार्ण
Show Answer
Ans.(c)
Sol. All Electrostatic Copiers work under the premise that a charge of electricity is place on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xergorahpy. A dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
Sol. All Electrostatic Copiers work under the premise that a charge of electricity is place on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xergorahpy. A dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
Q15. One Kilowatt hour is equal to-
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
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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