# TMA1/PHY192 – Physics Practical II

TMA Quiz Questions
TMA: TMA1/PHY192
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

30o30o

the angle of refraction is

 19o19o 60o60o 35o35o 70o70o
8 The critical angle for total internal reflection at an air – water interface is approximately

48o48o

. In which of the following situations will total internal reflection occur.

 light incident in water at 40o40o light incident in water at 55o55o light incident in air at 40o40o light incident in air at 55o55o
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
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