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Light and Wave
Class-test Name: Class: School: Time :40minutes
1 Red light travelling in glass strikes a glass-air boundary. Some light is reflected and some is refracted. hich diagramcorrectly sho!s the reflection and refraction"
2 #n the diagram$ %& is a converging 'conve() lens.*oints labelled F are one focal length from the lens and +oints labelled , F are t!o focal lengths from the lens. #f an obect
is +laced at $ at !hich +oint is the image of its base formed"
3 hat ha++ens to light as it +asses from glass into air"
A #ts fre/uency decreases because its s+eed decreases.
B #ts fre/uency increases because its s+eed increases.C #ts !avelength decreases because its s+eed decreases.
D #ts !avelength increases because its s+eed increases.
4 s!imming +ool is lit by a lam+ in the bottom of the +ool. The directions of three rays from the lam+ are sho!n.
hich of the marked angles is the critical angle for the light"
5 ray of light is incident on one side of a rectangular glass block.
#ts +ath is +lotted through the block and out through another side.hich +ath is not +ossible"
6 1ight rays are deviated by a +rism.
The deviation angle d is measured for light rays of different fre/uency$ including blue light and red light.
hich gra+h is correct"
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7 The diagram sho!s a +atient having her eyes tested. chart !ith letters on it is +laced behind her and she sees the chart
reflected in a +lane mirror.
3o! far a!ay from the +atient does the chart seem to be"
A ,m B 4m C m D 5m
8 Three students stand , m a+art in front of a +lane mirror !hich is 6 m long.
Student & is standing o++osite the mid-+oint of the mirror.3o! many students can see the images of the other t!o"
A 0 B 2 C , D 6
9 The diagram sho!s the image of a clock in a +lane mirror.
hat time is sho!n"
A 0,:, B 0,:6 C 07:, D 07:6
10 n obect +laced in front of a +lane mirror at +roduces an image at #.
#f the obect moves to!ards the mirror in the direction sho!n by the arro!$ in !hich direction does the image move"
11 The diagram sho!s the !aves in a ri++le tank in !hich the !ater in +arts * and 8 is of different de+ths.
,
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3o! do the !avelengths and the s+eeds V 2 and V , of the !aves com+are in * and in 8"
12 !ave source of fre/uency 2000 39 emits !aves of !avelength 0.20m.
3o! long does it take for the !aves to travel ,00m"
A ,. s B 4.0 s C , s D 200 s
13 The diagram sho!s +art of a s+ring that is shaken from side to side to +roduce a !ave.
The distance bet!een successive +eaks is 0.0 m and the fre/uency is ,. 39.
3o! long does it take for a !ave to travel 6.0 m along the s+ring"
A 0.,0 s B 0.0 s C ,.0 s D .0 s
14 vertical stick is di++ed u+ and do!n in !ater at *. #n t!o seconds$ three !ave crests are +roduced on the surface of the
!ater.
hich statement is true"
;istance % is the am+litude of the !aves.
< ;istance & is the !avelength of the !aves.
C =ach circle re+resents a !avefront.
; The fre/uency of the !aves is 639.
15 ater !aves travel more slo!ly in shallo! !ater than in dee+ !ater.
hich diagram sho!s !hat !ill ha++en to +lane !aves in dee+ !ater !hen they enter shallo! !ater"
16 The diagram sho!s a !ave.
3o! many !avelengths are there bet!een % and &"
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17 #f a !ave of velocity c is of fre/uency > and !avelength ? $ then for a !ave of velocity ,c$ the fre/uency and !avelength
could be
Frequen! Wave"ength
A ,> ,?
B >@, ? C >@, ,
D > ,?
18 hich line gives an e(am+le of a longitudinal !ave and describes its vibrations"
19 The diagram sho!s ho! dis+lacement varies !ith time as a !ave +asses a fi(ed +oint.
hat is the fre/uency of this !ave"
A 0., 39 B 0.0 39 C 2.0 39 D ,.0 39
20 >or infra-red radiation$ shiny surfaces are
A good absorbers and good emitters.
B good absorbers and +oor emitters.C +oor absorbers and good emitters.
D +oor absorbers and +oor emitters.
21 %-rays$ visible light and radio !aves are all +art of the electromagnetic s+ectrum.
hat is the correct order of increasing !avelength"
22 hich ty+e of !ave is used to send tele+hone signals to and from a satellite"
A infra-red !aves
B light !aves
C micro!aves
D sound !aves
23 hich does not normally use infra-red radiation"
A electric grill
B intruder alarm
C television remote controller D sunbed
24 hich statement is true for all electromagnetic !aves"
A They are longitudinal.B They can be seen.
C They have the same fre/uency in air.
D They travel at the same s+eed in a vacuum.
25 ray of light is incident on one side of a rectangular glass block$ so that the angle of refraction is 40A in the glass. hich
diagram correctly sho!s a +ossible +ath of this ray" BThe critical angle for glass is 4,A.
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26 >or a certain +arallel-sided glass block$ the value of sin i/ sin r is 2.0. ray of light +asses through the block and emerges at an angle of 0A to the surface of the block.
hat is the value of the angle marked X "
A 27.A B 6A C 40A D 4D.A
27 ray of red light enters a semi-circular glass block normal to the curved surface.
hich of the follo!ing correctly sho!s the +artial reflection and refraction of the ray"
28 ray of light enters a glass block at an angle of incidence i +roducing an angle of refraction r in the glass.
Several different values of i and r are measured$ and a gra+h is dra!n of sin i against sinr. hich gra+h is correct"
29 #n !hich diagram is the +ath of the light ray not correct"
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30 hat causes refraction !hen light travels from air into glass"
A The am+litude of the light !aves changes.
B The colour of the light changes.
C The fre/uency of the light !aves changes.D The s+eed of the light changes.
31 The diagram sho!s the direction of movement of a !avefront %& in medium 2 and$ later$ in medium ,.
3o! do the s+eed and fre/uency of the !ave change !hen the !avefront +asses into medium ,"
32 ater !aves change direction !hen they move from shallo! !ater to dee+ !ater.
hat is the name of this effect"
A diffraction
B dis+ersion
C reflectionD refraction
33 vibrator sends ri++les across the surface of !ater. They run closer together as they travel further from the vibrator.This
sho!s that the ri++les
A decrease in fre/uency.
B increase in fre/uency.C slo! do!n.
D s+eed u+.
34 surf-board moves at a s+eed of m@s on the crest of a !ave. The distance bet!een !ave crests is 20 m. hat is thefre/uency of the !ave motion"
A 0.39 B ,39 C 39 D 20 39
35 The diagram sho!s !aves set u+ in a ro+e by a student moving the free end u+
and do!n at a steady rate.
hat is the !avelength of the !aves sho!n$ and !hat !ill be the !avelength !hen the student doubles the fre/uency at
!hich the free end is moved u+ and do!n"
36 set of straight !ater ri++les in a ri++le tank travels over a thick$ triangular +ers+e( sheet. hich diagram sho!s the !ave
+attern"
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37 The diagram re+resents some of the main +arts of the electromagnetic s+ectrum.
hat are the numbered +arts"
2 , 6 4
A radio !aves ultraviolet visible light %-rays
B radio !aves visible light ultraviolet %-rays
C visible light ultraviolet %-rays radio !aves
D visible light ultraviolet radio !aves %-rays
38 flash of lightning and the corres+onding thunder cla+ are detected s a+art. #t is calculated that the lightning struck about
2D00 m a!ay. n !hich assum+tion is the calculation based"
A 1ight reaches us almost instantaneously$ but sound travels at 600 m @ s.B 1ight travels 600 m @ s faster than sound.
C Sound reaches us almost instantaneously$ but light travels at 600 m @ s.
D The sound of the thunder !as emitted s after the flash.
39 The diagram sho!s a ray of light entering a block of glass.
hich numbered angles are the angles of incidence and of refraction"
40 The diagram sho!s a !ater !ave in a ri++le tank.
The !ave has a s+eed of 2, cm@s at # . The !ave crosses a boundary $% !here the distance bet!een crests changes from
6.0 cm to 2. cm. hat is the velocity of the !ave at +oint &"
A 6.0 cm@s
B .0 cm@s
C 2, cm@s
D ,4 cm@s
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