THE PHYSICS PROBLEMS OF EVEN SEMESTER EXAMINATION
JUNIOR HIGH SCHOOOL I SELONG
YEAR 2009 – 2010
Choose the correct answer !
1. The vibration period can be calculate by T=t/n, t refer to time in second and n is number of
vibration. A load in simple swing 100 times for 200 seconds. What is vibration period of the
swing?
a. 0,5 second
b. 1,5 seconds
c. 2 seconds
d. 4 seconds
2. Wave velocity can be calculated with simple pattern, that is v = λ×f. λ refer to wave lenght
in meter, and f refer to frequency of wave in Hz. If f same with 1/T so the pattern of wave
velocity change into ...
a. v = λ×T
b. v = f×T
c. v = λ / T
d. v = f / T
3. You meet the vibration in around your home. Value of period is known 5 seconds, so the
frequency of this vibration is ....
a. 5 Hz
b. 2,5 Hz
c. 2 Hz
d. 0,2 Hz
4. We know that base of the direction of vibration and spreading the wave divide into two
kinds, that is transerve wave and longitudinal wave. This picture is one of wave.
v
The wave above include to .....
a. transerve wave
b. longitudinal wave
wave
c. spring wave
d.
potential
5. Sea water wave travels with velocity 32 meter/second forming wave of total lenght 24 meter
like shown by the picture.
24 m
The magnification of wave frequency is ....
a. 6 Hz
b. 4 Hz
c. 3 Hz
d. 2 Hz
6. This is a simple pendulum to describe the vibration.
x
y
z
Consider the figure, what vibration is done by pendulum if simple pendulum moves from xy-z-y-x-y-z ?
a. 1 vibration
b. 1½ vibrations
c. 2 vibration
d. 2½ vibrations
7. Sound wave can spread in solid, liquid, and gas. Base of experiment, the sound wave has
fastest velocity when spreads in ....
a. solid
b. gas
c. liquid
d. gel matter
8. We know that if a light hits a body surface commonly will be reflected. Now, please you
look picture follow.
y
t ra
re
fle
ct
ed
ra
y
n
ide
inc
c d
a
b
The incident angle is shown by letter ...
a. b
b. c
c. d
d. a
9. Base of the magnifiaction wave frequency the sound wave divide be three kinds, that is
infrasound (< 20 Hz), audiosound (20 Hz – 20.000 Hz), and ultrasound (20.000 Hz <). If
sound wave period is 0,0001 second, its mean this sound include to ....
a. infrasound
b. audiosound
c. supersound
d. ultrasound
10. Sound has several properties, one of them namely ...
a. sound can spread in vacuum
b. sound can spread without medium
c. sound is longitudinal wave
d. sound is trnaserve wave
11. In kentongan is made hole in the middle so the air enters in kentongan. When it is hit the
sound of kentongan becomes louder. Loud sound from kentongan is resulted by symptom ...
a. reflection of wave
c. refraction of wave
b. resonance of wave
d. polarization of wave
12. Sound wave beside can spread, can also be reflected if the sound wave hits hard surface,
such as wall or stone. In everyday life, it is found the phenomenon of wave reflection as
follow, exept ....
a. echo which is happening in the cave c. the tone thet changes in musical instrument
b. reverberation in cinema room
d. wavelenght received by antenna
13. A child shouts to reflector wall, 4 seconds later is heard reflection sound. If sound velocity
at that time is 340 m/s, so the distance of the child with reflector wall is ....
a. 85 meters
b. 170 meters
c. 680 meters
d. 1360 meters
14. You stand up 5 meters infront of flat mirror. Then, you move to avoid from mirror as far as
3 meters. The distance of the first your image to last your image is .....
a. 3 meters
b. 5 meters
c. 8 meters
d. 10 meters
15. The convex mirror has others name that is divergent mirror and negative mirror. The
divergent mirror its mean ...
a. the convex mirror can concentrate several ray
b. the convex mirror experiences ray reflection
c. the convex mirror can disseminate several ray
d. the convex mirror can disentangle several ray
16. The correct illustration about special ray from concave mirror is ...
A
b
M
f
c
M
f
d
M
f
M
f
17. Reflected angle is formed by reflected ray and normal line and incident angle is formed by
incident ray and normal line.
n
ide
inc
y
t ra
67o
ed
ct
fle
re
y
ra
The magnification reflected angle from picture above is ....
a. 113o
b. 67o
c. 30o
d. 23o
18. A body of height 8 cm is located 24 cm infront of convex mirror. If focus distance of the
convex mirror is 10 cm, the following properties of image are true, except ... .
a. virtual
c. upright and virtual
b. upright and enlarged
d. located behind mirror
19. Look at the picture!
1
2
AIR
WATER
3
AIR
4
AIR
AIR
WATER
WATER
WATER
The correct illustration about refraction rays is ...
a. picture number 1
c. picture number 3
b. picture number 2
d. picture number 4
20. The convex mirror forms virtual and upright image. Sony has a convex mirror which radius
of curvature is 60 cm. If he puts an object at 15 cm from the convex mirror so image
distance is ...
a. 10 cm behind the mirror
c. 10 cm infront of the mirror
b. 4 cm behind the mirror
d. 4 cm infront of the mirror
21. A concave mirror has focus distance of 12 cm. To form real image enlarged of 4 times so
object distance to the mirror is ... . (national evaluation)
a. 8 cm b. 15 cm
c. 20 cm
d. 30 cm
22. A body is located 6 cm infront of a concave mirror so formed the real image of distance 30
cm from the mirror. Focus distance of the mirror is ... .
a. 36 cm b. 24 cm
c. 6,2 cm
d. 5 cm
23. Look at the picture !
Base of this illustration, the incident rays disseminated by the lens. What is name of this
lens?
a. concave lens
c. convex lens
b. plan-concave lens
d. plan-convex lens
24. There are three eyes defect that is myopia, hypermetropia, and presbyopia. The
hypermetropia can helped by ... .
a. positive lens
b. negative lens
c. bifocal lens
d. flat lens
25. To determine focus distance of convex lens can use the formula 1/f = 1/so + 1/si. The
illustration below shows the procces of formation the real image by a lens.
12 cm
(+)
24 cm
The focus distance and power of lens is ... .
a. 8 cm and +12,5 diopters
c. 12 cm and +8⅓ diopters
b. 10 cm and +10 diopters
d. 24 cm and +25/6 diopters
26. The concave lens forms image with properties virtual, upright, and enlarged. The correct
illustration about image formation by concave lens is ... .
a
b
c
d
f
M
f
f
f
f
f
f
f
27. Astronomical telescope is an optical instrument used to observe objects in the sky, such as
moon, planets, or another objects in the sky. This telescope consist of two convex lenses that
is an objective lens and an ocular lens, with focus distance of the objective lens is larger than
focus distance of the ocular lens. The power of objective lens is 2 diopters and ocular lens
has power of 50 diopters. The magnification of image is ... .
a. 100 times
b. 52 times
c. 48 times
d. 25 times
28. A student sits rearmost in his class. When he sees writing on the whiteboard is seen not
clear, while his friend of adjacent chair can see clearly. Means that student suffers eye defect
of myopia. The correct illustration for myopia is ... .
a
b
c
d
29. Microscope consist of two lens, that is an objective lens and an ocular lens. The objective
lens is lens that faces to object directly, while the ocular lens is lens near to eyes. Both are
included kinds of ... .
a. divergent lens b. negative lens
c. convergent lens
d. concave lens
30. A book contains small writing so it is not clearly seen. To be able to see it is used a
magnifying glass of focus distance is 6 cm. If the magnifying glass is put 5 cm on the book,
the image magnification formed by the magnifying glass is ... .
a. 2 times
b. 6 times
c. 3 times
d. 5 times