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HSPTA MALAPPURAM, PHYSOL 2 -The Solution for Learning Physics, , Question Bank, CHAPTER 8 - ELECTROMAGNETIC WAVES, Each question scores One, Focus Area Based, 1, Electric field of a plane electromagnetic wave travelling in the positive Z direction is described, by……………………., Ans, Ex=E0 sin (kz- ω t), 2, The electric field vector of an electromagnetic wave is represented as Ex=Em sin(kz- ωt).Write the equation for, magnetic field vector, Ans:, By=Bm sin(kz-ωt), 3, The SI unit of displacement current is..............., (a) volt, (b) ampere, (c) ohm, (d) henry, Ans, Ampere, 4, It was James Clark Maxwell who modified Amperes Circuital Theorem by introducing the concept of, displacement current. What do you mean by displacement current?, Ans, Current produced by changing electric flux, 5, In a plane E.M wave the sinusoidally oscillating electric field has an amplitude of 60V/m. Calculate the amplitude, of the magnetic field, Given Eo= 60V/m, C= E0/Bo, B0=E0/c = 60/ 3x 108 = 20x10-8 T, 6, A certain radio station broadcasts at a frequency of 600KHz. What is the wavelength of the radio waves, Given υ= 600KHz= 600x103Hz, λ= c/υ= 3x108/600x103, =0.5x103 m, 7, Equation for displacement current is...., Ans, Id= 𝜖0 dϕ/dt, 8, E/B=........, Ans: c, 9, If E is along Y axis and B is along Z axis. E. M waves will be propagated through......, Ans: X axis., 10, The rays used for fake currency detection is...., Ans: Ultra violet., 11, The rays used for long range photography is...., Ans: Infra-red., 12, The rays used in remote controls is...., Ans: Infra-red., 13, Any hot objects can emit...... radiations., Ans: Infra-red, 14, Inner electron excitation produce....... rays., Ans: Ultra violet, Prepared by Higher Secondary Physics Teachers Association Malappuram

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15, 16, 17, 18, , Communication use......... Waves., Ans: Radio waves., .........used in Radars., Ans: Micro waves., Extremely hot objects like sun emits......, Ans: Ultra violet, Give the Ampere's circuital theorem with Maxwell's correction?, Ans:, ∮ℓ 𝐵. 𝑑𝑙 = 𝜇0 𝐼𝑐 + 𝜇0 𝐼𝑑, , 19, , Which part of e.m spectrum has largest penetrating power?, Ans: Gamma rays, 20, What oscillates in electromagnetic waves?, Ans: Photon, Non-Focus Area Based, 1, Arrange the following electromagnetic radiation in ascending order of frequency, Visible rays, infrared rays, X rays, gamma rays, Ans, Infra red, visible rays, X-rays, gamma rays, 2, Give one application of infrared and X rays, Ans, Infrared – remote switches of TV, long distance photography, X rays – treatment of cancer, detection of fracture, 3, Which of the following is not an electromagnetic wave?, a) X rays b) ϒ rays c)  rays d) Microwaves, Ans,  rays, 4, An electromagnetic wave is entering from one medium to another medium. Then the property which remains, unaltered is …………., Ans, Frequency, 5, The direction of propagation of a electromagnetic wave is that of………………, Ans, EXB, 6, We feel excessive sweating on a cloudy day why?, Ans, Due to green house effect, 7, Why only microwaves are used in microwave oven?, Ans, Frequency of microwave matches with normal frequency of water molecule so that energy from wave is transferred, effectively to the molecules, Each question scores Two, 1, 1 Match the following:, A, X-rays, Infrared, Microwave, Ultraviolet, , B, water purifier, Cancer treatment, Remote switch, Radar, , Ans, Prepared by Higher Secondary Physics Teachers Association Malappuram

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2, , 3, , 4, , 5, , 6, , A, B, X-rays, Cancer treatment, Infrared, Remote switch, Microwave, Radar, Ultraviolet, water purifier, Name the electromagnetic waves used for the following applications., a) Imaging of bones of human body., b) Mobile phone communication., c) Remote control of T.V. sets., d) For sterilizing surgical instruments, Ans, a) Imaging of bones of human body. → X rays, b) Mobile phone communication. → microwave, c) Remote control of T.V. sets. → Infrared, d) For sterilizing surgical instruments → U V, Match the following, A, B, C, Gamma rays, Sun burn, Photon emission by fast moving es, X - rays, Remote sensing, Electronic Deexication, Ultraviolet, Diagnosis, Oscillating current, Microwaves, Radio activity, Nucleus, , Ans, A, B, C, Gamma rays, Radio activity, Nucleus, X - rays, Diagnosis, Photon emission by fast moving es, Ultraviolet, Sunburn, Electronic Deexication, Microwaves, Remote sensing, Oscillating current, Match the following, A, B, Microwave, Cellular phone, Infrared, Water purifier, Radio waves, Oven, Ultraviolet, Remote Switch, Ans, A, B, Microwave, oven, Infrared, Remote switch, Radio waves, Cellular phone, Ultraviolet, Water purifier, Sun is a natural source of electromagnetic radiation, a) Which part of the electromagnetic spectrum is termed as heat wave?, b) Different animals are sensitive to different ranges of electromagnetic spectrum human eyes are sensitive to, which part of the electromagnetic spectrum?, Ans, a) Infrared waves, b) Visible spectrum, a) Ozone layer in the atmosphere act as a protective layer for living organism which radiation is prevented by, ozone Layer from reaching earth?, Prepared by Higher Secondary Physics Teachers Association Malappuram

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7, , 8, , b) Ozone layer depletion is caused by which gas?, Ans, a) Ultraviolet, b) CFC / Freon, Considering the electromagnetic spectrum, name the electromagnetic wave which, a) Which is used to detect fracture in bones?, b) Which is absorbed by ozone layer of our atmosphere?, c) Which is produced in nuclear reactions?, d) Arrange the above three waves in increasing order of wavelength, Ans, a) X ray, b) UV rays, c) Gamma ray, d) Gamma ray, X-ray, UV rays, Match the following, A, B, C, Microwave, Fracture of bones, Melanin, Infrared, Nuclear reactions, Cancer treatment, Ultraviolet, Klystron, Cellular phones, X - rays, Hot bodies and molecules, Radar, Ozone layer, Green house effect, Ans, A, Microwave, Infrared, Ultraviolet, X - rays, , 9, , 10, , B, Klystron, Hot bodies and molecule, Ozone layer, Fracture of bones, , C, Radar, Green house effect, Melanin, Cancer treatment, , The orderly distribution of electromagnetic radiations according to their wavelength or frequency is called, electromagnetic spectrum which, i) Is used for studying crystal structure., ii) Is absorbed by the ozone layer in the atmosphere., iii) Produces greenhouse effect., iv) Used in medicine to destroy cancer cells., Ans, i. X rays, ii. UV rays, iii. IR rays, iv. Gamma rays or X rays, Match the following, A, B, C, Radio waves, Nuclear reactions, Destroy cancer cells, Ultraviolet rays Inner shell electron transmission, Detect fake currency notes, Acceleration of charges in Conducting wires, Physical therapy, Cellular phones, Ans, A, B, C, Radio waves, Acceleration of charges in Conducting wires, Cellular phones, Ultraviolet rays Inner shell electron transmission, Detect fake currency notes, Prepared by Higher Secondary Physics Teachers Association Malappuram

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11, , 12, , 13, , Choose the appropriate values for X rays from the given table, Wavelength, Frequency, 1 mm, , 3 x 1017Hz, , 1m, , 3 x 108 Hz, , 1 nm, , 3x 10 21 Hz, , Ans, 1 nm 3x 10 21 Hz, Which electromagnetic waves are used for the following purposes?, i. Diagnostic tool in medicine, ii. Kill germs in water purifier, iii. Cellular phones, iv. In remote switches of household electronic systems, Ans, i. X rays, ii. UV rays, iii. Radio waves, iv. IR rays, Name the part of the electromagnetic spectrum, a) used in radar system, b) produced by bombarding a metal target by a high-speed electron, c) Electromagnetic waves are produced by ……………….., Ans, a) Microwaves, b) X-rays, c) charges in accelerated motion, , Prepared by Higher Secondary Physics Teachers Association Malappuram