TMA1/PHY192

My TMA Home TMA Results My Pending TMA Quick Help TMA Quiz Questions TMA: TMA1/PHY192  SCORE=9.50 PHY192 - Physics Practical II Mr. Ibanga Efiong (eibanga@noun.edu.ng ) 1 The law of reflection says that the angle of reflection from a mirror equals the angle of incidence. waves incident on a mirror are partially reflected. all waves incident on a mirror are reflected.  the angle a ray is reflected from a mirror is random. 2 When a virtual image is created in a plane mirror the image is upright. the image is located behind the mirror. reflected rays diverge. all of the above 3 The critical angle for a light from the bottom of a swimming pool shining upward toward the pool's surface is the angle where light is refracted so it just skims the pool surface. 43 degrees.  at which all light is refracted out of the pool. 42 degrees. 4 Convex mirrors are mostly used as magnifying glasses driving mirrors dentist mirrors artist mirrors 5 In an experiment involving a spherical mirror, 1/v was plotted on the vertical axis and 1/u on the horizontal axis. What is the linear magnification? slope of the graph inverse of the the slope of the graph intercept on the vertical axis intercept on the horizontal axis 6 Which of the following is NOT true of experiments involving curved mirrors? image distance is negative for for real image object distance is positive image distance is negative for virtual image focal length is negative for convex mirrors 7 An estimate of the refractive index of glass is 1.5. If the angle of incidence is 30o$${30}^o$$ the angle of refraction is 19o$${19}^o$$ 60o$${60}^o$$ 35o$${35}^o$$ 70o$${70}^o$$ 8 The critical angle for total internal reflection at an air - water interface is approximately 48o$${48}^o$$ . In which of the following situations will total internal reflection occur. light incident in water at 40o$${40}^o$$ light incident in water at 55o$${55}^o$$ light incident in air at 40o$${40}^o$$ light incident in air at 55o$${55}^o$$ 9 When refraction occurs which of the following remains unchanged? wave number wavelength velocity frequecy 10 Which of these may NOT be a useful apparatus in an optical experiment? optical pins lenses protractor crocodile clip 11 Refraction is a measure of the ------------ as a wave passes from medium to another velocity frequency wavefront displacement 12 The image of an object is found to be upright and reduced in size. What type of mirror is used to produce such an image? Concave Convex Both mirrors None of the above 13 Convex mirrors are mostly used as magnifying glasses driving mirrors dentist mirrors artist mirrors 14 Which of the following is NOT true of experiments involving curved mirrors? image distance is negative for for real image object distance is positive image distance is negative for virtual image focal length is negative for convex mirrors 15 Which of the following is NOT applicable when plotting the graph of experimntal data? Lines of bestfit should always be used circled dots or crosses may be used to show plotted points thin, sharp and continuous lines are acceptable the scale must be chosen to make the graph occupy as small as possible of the graph page 16 The potentiometer wire plays equivalent role of which of these devices in a circuit? rheostat thermostat galvanometer ammeter 17 The reason we can read print from any direction is that the white part of a page reflects light in all directions letters emit black light in all directions. letters absorb black light from all directions.  all of the above 18 In an experiment, potential difference is plotted on the vertical axis and current on the horizontal axis. The slope of the graph represents resistivity conductivity resistance conductance 19 For a metallic conductor, Ohm's law holds provided potential difference varies current remains constant temperature remains constant potential difference remains constant 20 Calculate the distance and magnification of an object placed 20cm from a converging lens 60cm and 0.3 times the size of object 20cm and 0.3 times the size of object 60cm and 3 times the size of object 80cm and 3 times the size of object