SPHlU ENERGY TEST Part A: Multiple Choice {15 marks] Name: identir the choice that best completes the statement or answers the question. I. [fa 100 W light bulb consumes 500 .l ofelectrical energy in a time interval {t}1 then in the same time interval, a 200 W light bulb consumes: a. SOD J b. 1000 J c. 2000 I d. none ofthese 2. A boy decides to ignite caps from a toy gun in the following manner: He uses a magnifying glass to focus the sun's rays on a cap. [t ignites with a loud bang. Which of the following energy transformations best describes the situation?I a} soundrchemical arradiant d} sound -}radiant -}chemica1 b} radiant-)chemical sound e} none ofthe above c) chemical-)radiant -)sound 3. If two substances ofequal mass are supplied the same amount of thermal energy and their nal temperatures are dierent, you can assume that they have a} different heat capacities [1} different densities b) the same volume e) different volumes c) different abilities to conduct heat 4. [n which of the following situations is work not being done? a. A hockey puck travelling at constant velocity across a frictionless surface. b. Pushing a box across a rough carpet. c. Lifting a barbell upwards against the force of gravity. d. An automobile decelerating from 50 krm'h to 30 kah. 5. The derived unit with a special name for work or energy is the joule [J }. The derived unit with a compound name tor work or energy is the: a. kg 0 E: s b. H d. Him In c. N'kg In. A ball with a mass of 125 g is on top of a bookcase that is 2.95 m tall. The ball rolls off the bookcase where it bounces on the oor and lands on the top ofa table. [fthe tabletop is 1.20 m above the oor1 what is the magnitude of the change in gravitational potential energy of the ball after it lands on the table'?I a. 2.l51 c. 4.421 b. 1.4? .l d. 3.62 J '1". An electron has a mass of 911 3-: [0'31 kg. What is the speed ofan electron that has 3.2El x [0'16 .T ofkinetic energy? a. 7.02 x to" nits c. 2.55 x to? this b. 1.33:; mines d. I.E'ixl0?n1.-'s