{"id":10174447,"date":"2020-08-30T12:16:13","date_gmt":"2020-08-30T06:46:13","guid":{"rendered":"https:\/\/entri.app\/blog\/?p=10174447"},"modified":"2024-06-14T17:23:12","modified_gmt":"2024-06-14T11:53:12","slug":"important-topics-of-physics-for-rrb-railways-exam","status":"publish","type":"post","link":"https:\/\/entri.app\/blog\/important-topics-of-physics-for-rrb-railways-exam\/","title":{"rendered":"Important Topics of Physics For RRB Railways Exam"},"content":{"rendered":"

Railway jobs in India are one of the most appreciated and demanding Jobs. Every year, Ministry of Railway announces lakhs of vacancies for various posts such as Locomotor Driver, Non Technical Popular Category (NTPC Posts), Station Master (ASM), Ticket Collector (TC),\u00a0 Gangman, Various Group D Posts, ITI, Apprentice,Paramedical, Medical Officer, Specialists and Others. In this blog we will discuss about Important Topics of Physics For RRB Railways Exam.<\/strong><\/p>\n

Indian Railways has published the recruitment notification to the post of Apprentice, Doctor, Paramedical Posts under Northeast Railway, Central Railway, and South East Central Railway.\u00a0\u00a0<\/strong>More than 5000 vacancies are available under Railway Recruitment 2024.<\/p>\n

Indian Railways is one of the world\u2019s largest Rail Network always has an attracting scope of career for youth with its lucrative job profiles and a list of perquisites only railway employees can avail. Various regional units of Indian Railway\u2019s has invited applications for the recruitment to the posts such as Group C, Group D, This year, Railway Recruitment Board of the country showered the young Indians with some great Railway job opportunities across the country.<\/p>\n

Keeping the upcoming RRB NTPC, RRB Group D, in mind, we have provided some Important Physics Notes in this blog. It will help you boost up your score in the upcoming RRB Railways Exam.<\/p>\n

Prepare for RRB Exams!\u00a0<\/a><\/p>\n

Important Topics of Physics For RRB: Basic Topics of Physics<\/strong><\/h2>\n

Work<\/strong><\/h3>\n

Work is said to be done, if force acting on a body is able to actually move it through some distance in the direction of the force. Its SI unit is a joule.<\/p>\n

Energy<\/strong><\/h3>\n

Energy is a scalar quantity and its unit is Joule.The sum of all kinds of energies in an isolated system remains constant at all times. This is the law of conservation of energy.<\/p>\n

Power<\/strong><\/h3>\n

Its unit is watt.
\n\u2022 1 watt hour = 3600 Joule
\n\u2022 1 kilowatt hour = 3.6 x 106
\njoule
\n\u2022 1HP = 746 watt<\/p>\n

Gravitation<\/strong><\/h3>\n

Everybody in the universe attracts other body by a force called force of gravitation.
\n\u2022 The gravitational force of the earth is called gravity.
\n\u2022 The acceleration produced in a body due to force of gravity is called acceleration due to gravity (g) and its value is 9.8 m\/s’
\n\u2022 Acceleration due to gravity is independent of shape,size and mass of the body.
\n\u2022 Escape velocity is the minimum velocity with, which an object just crosses the Earth’s gravitational field and never returns. Escape velocity at the Earth’s surface is 11.2 km\/s.
\n\u2022 Escape velocity at the Moon’s surface is 2.4 km\/s. Due to low escape velocity there is no atmosphere on the moon.
\n\u2022 Value of g decreases with height or depth from Earth surface.
\n\u2022 g is maximum at poles.
\n\u2022 g is minimum at equator.
\n\u2022 g decreases due to rotation of Earth.
\n\u2022 g decreases if angular speed of Earth increases and increases if angular speed of Earth decreases.
\n\u2022 The acceleration due to gravity at the moon is onesixth that of the Earth. So, the weight of a person on the surface of the moon will be 1\/6 of his actual weight on the Earth.<\/p>\n

Satellite<\/strong><\/h3>\n

Satellites are natural or artificial bodies revolving around a planet under its gravitational force of attraction.
\n\u2022 Moon is a natural satellite, while INSAT-B is an artificial satellite of Earth.
\n\u2022 The period of revolution of satellite revolving near the surface of earth is 1 hour 24 minutes (34 minutes).
\n\u2022 Geo-stationary satellite revolves around the Earth at a height 36000 km (approx).
\n\u2022 Time period of rotation of geo-stationary satellite is 24 hours.
\n\u2022 The Earth rotates on its axis from West to East. This rotation makes the Sun and the stars appear to be moving across the sky from East to West.
\n\u2022 A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth’s rotation period.
\n\u2022 A special case of geosynchronous satellite is the geostationary satellite, which has a geostationary orbit \u2013 a circular geosynchronous orbit directly above the Earth’s equator.
\n\u2022 Geo-stationary satellite is used to telecast. TV programmes from one part of the world to another, in weather forecasting, in predictions of floods and droughts.
\n\u2022 Polar Satellite Revolves around the earth in polar orbit at a height of 800km.<\/p>\n

Newton’s Law of Motion<\/strong><\/h3>\n

First Law:<\/strong> Everybody maintains its initial state of rest or motion with uniform speed on a straight line unless an external force acts on it. It is also called Galileo’s law or law of inertia. Example While jumping from a slowly moving train\/bus one must run for short distance, in the direction of motion.<\/p>\n

\u2022 Second Law<\/strong>: The form acting on an object is directly proportioned to the product of the mass of the object and the acceleration produced on it.
\n\u2022 Third Law<\/strong>: To every action, there is an equal and opposite reaction.Example : Bogies of the trains are provided with buffers to avoid severe jerks during shunting of trains.
\nRocket moves up due to reaction of downward ejection of gas.<\/p>\n

Circular Motion<\/strong><\/h4>\n

\u2022 When an object moves along a circular path, its motion is called circular motion.
\n\u2022 The external force required to act radially inward over the circular motion of the body is called Centripetal force.
\n\u2022 Centrifugal force is such a pseudo force that. is equal and opposite to Centripetal force.
\n\u2022 Cream separator, centrifugal dryer work on the principle of centrifugal force.<\/p>\n

Friction<\/strong><\/h4>\n

\u2022 In the opposing force that is set-up between the surfaces of contact, when one body slides or rolls or tends to do so on the surface of another body.
\n\u2022 Due to friction, we are able to move on the surface of Earth.
\n\u2022 While applying brakes in automobiles, it stops only due to friction.<\/p>\n

Pascal’s Law of Pressure<\/strong><\/h4>\n

\u2022Hydraulic lift, hydraulic press and hydraulic brakes are based on the Pascal’s law of pressure.<\/p>\n

Archimedes Principle<\/strong><\/h4>\n

\u2022 When a body is immersed partly or wholly in a liquid,there is an apparent loss in the weight of the body,which is equal to the weight of liquid displaced by the body.
\n\u2022 The weight of water displaced by an iron ball is less than its own weight. Whereas water displaced by the immersed portion of a ship is equal to its weight. So,small ball of iron ball sink in water, but large ship float.
\n\u2022 A fat person will quickly learn the swimming as compared to a slim person because he will displace more water. So, it will be more balanced.
\n\u2022 Hydrogen filled balloon float in air because hydrogen is lighter than air. A person can lift more weight in water.<\/p>\n

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CLICK HERE TO DOWNLOAD PHYSICS PDF<\/strong><\/p>\n<\/a><\/div>\n

Important Topics of Physics For RRB: Some Conversion Factors<\/strong><\/h3>\n

Mass and Density<\/strong>
\n\u2022 1 Kg = 1000 g = 6.02 u
\n\u2022 1 Slug = 14.6 kg
\n\u2022 1 u = 1.66 kg<\/p>\n

Length and Volume<\/strong>
\n\u2022 1 m = 100 cm = 39.4 inch = 3.28 ft
\n\u2022 1 mile = 1.61 km = 5280 ft
\n\u2022 1 inch = 2.54 cm<\/p>\n

\u2022 1 nm = m = 10 A
\n\u2022 1 pm = m = 1000 fm
\n\u2022 1 light year = 9.46 m
\n\u2022 1 = 1000 L = 35.3 = 264 gal<\/p>\n

Angular Measure<\/strong>
\n\u2022 1 m\/s = 3.28 ft\/ s = 2.24 mi \/ h
\n\u2022 1 km \/ h = 0.621 mi \/ h = 0.278 m\/s<\/p>\n

Force and Pressure<\/strong>
\n\u2022 1 lb = 4.45 N
\n\u2022 1 ton = 2000 lb
\n\u2022 1 Pa = 1 N\/ = 10 dyne\/ = 1.45 lb\/
\n\u2022 1 atm = 1.01 x 105 Pa = 14.7 lb\/ = 76 cm \u2013 Hg<\/p>\n

Be a Loco Pilot in Indian Railways!<\/a><\/p>\n

\u00a0Some Important Scientific Instruments
\n<\/strong><\/h3>\n

\u2022 Accumulator: Electrical energy is stored
\n\u2022 Altimeter: Used in aircraft for measuring altitudes
\n\u2022 Ammeter: Measuring the electrical current in amperes
\n\u2022 Anemometer: Measuring the strength of winds
\n\u2022 Audiometer: Measuring intensity of wind
\n\u2022 Audiophone: It is used for improving imperfect sense of hearing.
\n\u2022 Barometer: Measuring atmospheric pressure
\n\u2022 Binocular: An optical instrument designed for magnified view of distant objects by both eyes simultaneously
\n\u2022 Bolometer: To measure heat radiation
\n\u2022 Cardiogram: For recording the heart movements
\n\u2022 Calorimeter: Measuring of quantities of heat
\n\u2022 Chronometer: A clock that keeps very accurate time as the one that is used to determine longitude at sea.
\n\u2022 Colorimeter: An instrument for comparing intensities of colour.
\n\u2022 Commutator: An instrument to change or remove the direction of an electric current, in dynamo used to convert
\nalternating current into direct current.
\n\u2022 Cyclotron: Studying the properties of atoms by smashing them.
\n\u2022 Dynamo: A device for converting mechanical energy into electrical energy
\n\u2022 Dynamometer: An instrument for measuring the electrical power
\n\u2022 Electroscope: An instrument for detecting the presence of electric charge.
\n\u2022 Endoscope: To examine internal parts of the body
\n\u2022 Fathometer: Measure depth of the ocean
\n\u2022 Galvanometer: For detecting and measuring electric current
\n\u2022 Hygrometer: Measure level of humidity
\n\u2022 Phonograph: For reproducing sound
\n\u2022 Pyrometer: Measure very high temperature
\n\u2022 Quartz Clock: A highly accurate clock used in astronomical observations and other precision work
\n\u2022 Radar: Radio, angle, detection and range is used to detect the direction and range of an approaching aeroplane by
\nmeans of radio micro waves
\n\u2022 Radiometer: An instrument for measuring the emission of radiant energy
\n\u2022 Radio Micrometer: An instrument for measuring heat radiations.<\/p>\n

Get ready for RRB, attempt free mock tests for various competition<\/a><\/p>\n

Important Links:<\/strong><\/p>\n

RRB ALP and Technician Eligibility 2020 \u2013 Age Limit and Educational Qualification<\/a><\/p>\n

How to Prepare for the RRB SSE 2020 Exam?<\/a><\/p>\n

What is the Role and Objective of RRB?<\/a><\/p>\n

How you can use Entri app for your exam preparation:<\/strong><\/p>\n