Test Format Light & Wave

8/17/2019 Test Format Light & Wave

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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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Test Format Light & Wave