Electromagnetic Spectrum 1. Which of the following statement is TRUE about Radio waves? They have the longest wavelength within the electromagnetic spectrum Radio waves are produced by oscillating electrical circuits and transmitted through antennas (aerials) Radio waves are detected by resonant circuits in radio receiversAll of the above Question 1 of 21 2. Which of the following statements is NOT TRUE about Infrared Radiation Infrared radiation is produced as a result of small energy changes of an electron in an atom and are produced by any hot body Infrared radiation is produced by the sun only Infrared radiation is detectable by skin, thermopile, bolometer and thermometer with blackened bulb Infrared radiation has a longer wavelength than U.VQuestion 2 of 21 3. Which of the following is NOT a beneficial use of Ultraviolet radiation? Used in minerals analysis Cause malignant mutations in the skin (melanoma)Used to detect forgeries Used to kill bacteria and skin treatment Question 3 of 21 4. Which of the following statements is TRUE about Ultraviolet Radiation (U.V) U.V is produced by the sun, sparks and mercury vapor lamps and is generated as a result of large energy changes in the electrons of an atom No ideaU.V is produced Cathode Ray Tubes U.V rays are invisible but detectable by photocells, photographic films and fluorescent materials Question 4 of 21 5. Which of the following statements about X-rays is CORRECT? X-rays are carried in X-ray tubes X-rays originate from a beam of fast moving electrons hitting a metal target X-rays are detected by using a fluorescent screen or photographic film all of the aboveQuestion 5 of 21 6. Electromagnetic waves are transverse waves which result from oscillating electric and magnetic fields at right angles to each other. True or False? False True Maybe None Question 6 of 21 7. Which of the following is an example of electromagnetic waves? Light rays Ultraviolet Infrared All of the above Question 7 of 21 8. Which of the following is a beneficial use of X-rays? X-rays are capable of killing malignant tissues Controlling pests and germs by irradiation Detect flaws in metals and forgeries in art All of the above Question 8 of 21 9. Mention 3 properties of electromagnetic waves They travel through space (vacuum) with the speed of light (3.0 x 10 power of 8) They are transverse waves in nature They undergo interference, reflection, diffraction, refraction and polarization effects. All of the above Question 9 of 21 10. In electromagnetic waves, the energy in the wave is computed by the formula E = hf where: h = plancks constant ( 6.63 x 10 power of -34 Js) and F= frequency of the wave. True or False? True False Maybe NoneQuestion 10 of 21 11. Which electromagnetic wave is produced as a result of small energy changes in the electrons of an atom? Visible light Ultra violet radiation Infrared radiation X-rays Question 11 of 21 12. Which of the following is NOT a beneficial use of infrared radiation? Causes heating effect therefore used in cooking, heating and drying Used to warm greenhouses Contribute to the GreenHouse EffectUsed in infrared photography Question 12 of 21 13. State the energy formula of electromagnetic waves E = m x c x cE =hf E =f x lambda None Question 13 of 21 14. Which of the following statements about Gamma rays is CORRECT? Gamma rays are emitted by radioactive substances Gamma rays result from energy changes occurring in the nucleus of radioactive atoms Gamma rays are detected by photographic plates and radiation detectorsAll of the above Question 14 of 21 15. Mention the some of the hazards of electromagnetic waves Ultraviolet rays, X-rays and Gamma rays when absorbed into human body in large doses may cause damage to body cells, skin burns and affect the eyes. Radio waves lead to disruption and high noise levels Microwaves lead to spoiling of food All of the above Question 15 of 21 16. Which of the following is NOT a beneficial use of Gamma rays? Cause ionization and mutation in cellsSterilizing medical equipment Killing cancerous and malignant growth in human body To detect flaws in metals in industries Question 16 of 21 17. Which electromagnetic wave is produced by magnetrons? X-rays Microwaves Visible light Radio waves Question 17 of 21 18. Which electromagnetic wave is produced as a result of large energy changes in the electrons of an atom? Ultra violet radiation Visible light Infrared radiation X-rays Question 18 of 21 19. Which of the following is a beneficial use of Radio waves? Medium and short wavelength radio waves are used in radio transmission signals Very high frequency are used in V.H.F radios to transmit and receive over short distanceShorter wavelengths are used for television broadcastsAll of the above Question 19 of 21 20. Define electromagnetic spectrum It is an arrangement of electromagnetic waves in order.It is an arrangement of electromagnetic waves arranged in order of wavelengths.It is an array of electromagnetic waves in order of wavelengths and frequencies.None Question 20 of 21 21. Mention 2 electromagnetic waves produced by the sun RadiowavesInfrared radiation Ultraviolet radiation red light lensQuestion 21 of 21 Loading...
