2nd Grading Science 10

SECOND QUARTER EXAMINATION SCIENCE 10 Name: __________________________________Date:________________Score:____________  Section: _________________________________Subject Teacher: Teacher: _______________________  I.

MUL MULTIPLE IPLE CHOI CHOICE CE.. Read the statements carefully. Each statement has four choices to choose on. Select your best answer by writing the letter only on your Answer Sheet.

. !n which which case case or or cases cases is an electric electric field field "rese "resent# nt# !. A s"a s"ar$ r$ jum"i jum"ing ng betw between een two two nea nearby rby rod rods. s. !!. A charge charge that that is moment momentarily arily at rest. rest. !!!. !!!. A dea dead d "ower "ower line. line.  A. ! only

%. ! and !! only

&. !! and !!! only

D. !' !!' and and !!!

(. )hich de*ices de*ices can be used used to determine determine the "olarity "olarity of an unmar$ed unmar$ed magnet# magnet#  A. A sus"ended sus"ended magneti+ed magneti+ed needle needle &. a second second unmar$ed unmar$ed magnet magnet %. An im"ro* im"ro*ise ised d mag magne netic tic board board D. a cha charge rged d met metal al rod at rest rest ,. !n which which de*ice de*ice is magnetic magnetic field "resent# "resent#  A. A charged balloon. balloon. &. A *ery hot horse-shoe horse-shoe magnet. %. A cooling soldering iron. D. A micro"hone undergoing a sound chec$. .  A. %. &. D.

/ow will you describe describe the magnetic magnetic field around around a current-carrying current-carrying coil# The magnetic magnetic field is wea$est near near and around around the coil. The magnetic magnetic field *ary directly directly with the distance distance from from the coil. coil. The magnetic magnetic field s strongest strongest inside inside the current-carry current-carrying ing coil. The magnetic magnetic field lines lines are closed closed loo"s along the loo"s in the the coil.

0.  A. %. &. D.

)hich state statement ment about about an electro electromagn magnetic etic nail nail is N1T TR2E# TR2E# Steady magnetic magnetic lines lines of induction induction surround surround a battery-"owe battery-"owered red electromagnetic electromagnetic nail. The current current in the the electromagneti electromagnetic c nail demagneti demagneti+es +es the iron nail. nail. The magnetic magnetic field lines "roduced "roduced resemble resemble that that of a bar magnet. magnet. The magnetic magnetic field strength is "ro"ortional "ro"ortional to to nail3s current.

4.  A. %. &. D.

)hat basic basic "rinci"le "rinci"le enables enables A55 electric generators generators to o"erate# !ron is the only element element that is magnetic. magnetic. 1""osite 1""osite electric electric charges charges attract attract and and li$e charges charges re"el. re"el. A closed-loo" closed-loo" conductor conductor within within a changing changing magnetic field field will e6"erience e6"erience a magnetic magnetic force. A current-carryin current-carrying g conductor conductor "laced within a magnetic field field will e6"erience e6"erience a magnetic magnetic force.

7. )hat transformatio transformation n can ta$e "lace "lace in in a ceiling fan3s electric motor#  A. Electrical energy energy into mechanical mechanical energy&. Alternating Alternating current into direct current current %. 8echanical 8echanical energy into electrical electrical energy energy D. Direct current into alternating alternating current 9.  A. %. <.  A. %.

)hich two wa*es wa*es lie lie at the the ends ends of the *isible *isible s"ectru s"ectrum# m# !nfrared and and 2ltra*iolet 2ltra*iolet rays &. Radio wa*es wa*es and -rays Radio wa*es and 8icrowa*es D. -rays and ;amma rays )hat transfo transformat rmation ion can ta$e ta$e "lace "lace in an im"ro*ised im"ro*ised gene generato rator# r# Electrical energy energy into mechanical mechanical energy&. Alternating Alternating current into direct current current 8echanical 8echanical energy into electrical electrical energy energy D. Direct current into alternating alternating current

=. !n the *isible s"ectrum' which color has the longest wa*elength# wa*elength#  A. %lue %. ;reen &. Red

D. >iolet >iolet

. . )hat ty"e of electromagnetic electromagnetic wa*es wa*es is used in radar#  A. !nfrared rays rays %. 8icrowa*es 8icrowa*es &. Radio wa*es wa*es

D. 2ltra*iolet 2ltra*iolet rays

(. )hich electromagnetic electromagnetic wa*e carries more energy than the others# others#  A. 8icrowa*es %. Radio wa*es &. 2> radiation radiation

D. *isible light light

,. )hat electromagnetic electromagnetic wa*e is sometimes called heat rays#  A. ;amma Rays Rays %. !nfrared !nfrared &. Radio wa*es wa*es

D. >isible >isible light

. A light ray' ray' tra*eling "arallel "arallel to a conca*e mirror3s a6is' stri$es the mirror3s surface. The reflected reflected ray  _____________  ____________________ ___________. ____.  A. "asses through through the mirror3s focal "oint "oint

&. tra*els at at right angles angles to the the mirror3s a6is

%. again tra*els "arallel to the mirror3s a6is D. "asses through the mirror3s center of cur*ature 0. )hat $ind of mirror is used in automobiles and truc$s to gi*e the dri*er a wider area and smaller image of traffic behind them#  A. ?lane mirror %. &on*e6 mirror

&. &onca*e mirror

D. None of the abo*e

4. )hat ty"e of mirror do dentists usually use to see clearly the images of our teeth#  A. ?lane mirror %. &on*e6 mirror &. &onca*e mirror D. None of the abo*e 7. A white sheet of "a"er cannot act as mirror because it ________ the rays of light.  A. Diffracts %. diffuses &. interferes D. Refract 9. @ou see our face clearly if you loo$ down on a "oll of still water. )hich one of the following  A. %. &. D.

statements gi*es the best e6"lanation for this obser*ation# 5ight entering the water is dis"ersed. Regular reflection of light ha""ens on the surface of still water. !rregular reflection of light ha""ens on the surface of still water. 5ight is reflected from the surface of water in different directions.

<. A light ray' tra*eling "arallel to a conca*e lens3 a6is and stri$es the lens' will refract and ________.  A. ?ass through the lens3 focal "oint. &. &ontinue to tra*el in the same direction %. Tra*el "arallel to the "rinci"al a6is D. tra*el at right angles to the "rinci"al a6is (=. Sun3s rays are obser*ed to focus at a "oint behind a lens. )hat $ind of lens was used#  A. &on*erging lens %. Di*erging lens &. ocusing lens D. None of the abo*e (. This o"tical instrument uses ( con*e6 lenses to ma$e a smaller object larger.  A. &amera %. 8icrosco"e &. 1scillosco"e D. Telesco"e ((. )hich of the following o"tical instruments will be used to "roduce a reduced and in*erted image of a distant object#  A. &amera %. ?rojector &. 8icrosco"e D. Refracting Telesco"e (,. )hy is it easier to read a news"a"er than a glossy maga+ine#  A. %ecause incident rays of light on a news"a"er reflect in different directions while incident rays of light on a glossy maga+ine reflect in only one direction %. %ecause incident rays of light on a news"a"er reflect in only one direction while incident rays of light on a glossy maga+ine reflect in different directions. &. %ecause the incident rays of light on a glossy maga+ine con*erge at the focus. D. %ecause incident rays of light on a news"a"er con*erge at the focus. (. )hat $ind of mirror is used by de"artment stores to gi*e a wider area and smaller image of the sho""ersBbuyers#  A. ?lane mirror %. &on*e6 8irror

&. &onca*e 8irror

D. None of the abo*e

(0. !f you loo$ down on a "ool of wa*y water' you can3t see your face clearly. )hich one of the following  A. %. &. D.

gi*es the best e6"lanation for this obser*ation# 5ight entering the water is dis"ersed Regular reflection of light ha""ens on the surface of wa*y water. !rregular reflection of light ha""ens on the surface of wa*y water. 5ight is reflected from the surface of water in the different.

(4. )hat ty"e of lens "roduces smaller and u"right images#  A. &onca*e lens %. &on*e6 lens &. &on*erging lens

D. &an3t be determined

(7. /ow will you describe the magnetic field around a straight current-carrying wire#  A. The magnetic field is strongest near and around the wire. %. The magnetic field consists of straight lines "arallel to the wire. &. The magnetic field does not *ary with the distance from the wire. D. The magnetic field gets stronger with increasing distance from the wire. (9. )hich statement about an electromagnet is TR2E#  A. The electric field surrounding a battery-"owered electromagnet alternates constantly. %. The current in the electromagnet coil tem"orarily magneti+es the iron coil. &. The electric field strength is in*ersely "ro"ortional to the current. D. The magnetic field lines "roduced are all straight.

(<. As "art of a traffic light system' large loo"s of wire are buried beneath road intersections. )hich of the statements is N1T TR2E about the o"eration of this traffic light system#  A. >ehicles dri*en o*er the buried coils acti*ate a traffic light sensor. %. The conducting loo"s acti*ate a color de"endent field. &. The alternating current sent through the buried coils "roduce an electromagnetic field in each coil. D. A minimum number of *ehicles o*er the coils can trigger the traffic light to change green.

,=. A loo" of conductor lies flat on a hori+ontal table. A toy magnet is hanging still o*er it with the magnet3s north see$ing "ole "ointing down. )hat ha""ens ne6t#  A. The magnet "roduces a cloc$wise current in the coil. %. The magnet does not "roduce any current in the coil. &. The magnet "roduces an u"ward electromagnetic current. D. The magnet "roduces a countercloc$wise current in the coil. II. MATCHING TYPE. 8atch the scientists gi*en below with their contributions. SCIENTISTS

CONTRIBUTIONS

 ________. Am"ere

A. Showed how a current carrying wire beha*es li$e a magnet.

 ________(. araday

%. ormulated the "rinci"le behind electromagnetic induction.

 ________,. /ert+

&. Demonstrated the magnetic effect based on the direction of current.

 ________. 8a6well

D. Showed e6"erimental e*idence of electromagnetic wa*es and their lin$ to light.

 ________0. 1ersted

E. &ontributed in de*elo"ing eCuations that showed the relationshi" of electricity and magnetism.

III. Ray Diagramming. &onstruct ray diagrams to determine the location' orientation' si+e' and ty"e of  images formed by cur*ed mirrorBlenses. , "oints each Cr!"# Mirr$r

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