WorksheetsAL AZHAR 10 ISLAMIC JUNIOR HIGH SCHOOL SCIENCE QUIZ
Total questions: 50
Worksheet time: 50mins
The delay time between light of thunder and sound of thunder is 2 seconds. If the speed of sound at the air is 340 m/s, how far the thunder from you?
The highest point of wave is called ....
A. crest
B. trough
C. amplitude
D. wavelength
The formula to calculate speed of wave is ....
A. v =λ / T
B. v = λ / f
C. v = λ . f
D. v = v. T
The SI unit of frequency is ....
A. desible
B. ampli
C. hertz
D. oktaf
The number of vibrations that occur every second is called ....
A. frequency
B. period
C. amplitude
D. wave
A spring has frequency 50 Hz. What is the period of the spring?
A. 1/50 s
B. 1/5 s
C. 5 s
D. 50 s
A wave travels at a speed of 280 m/s with a wavelength of 0.7 m. What is the frequency of the wave?
A. 200 Hz
B. 350 Hz
C. 400 Hz
D. 500 Hz
If a pendulum completes 20 oscillations in 5 seconds, what is the frequency of the pendulum?
A. 2 Hz
B. 4 Hz
C. 5 Hz
D. 6 Hz
What is the total number of vibrations made by a lato-lato in the sequence A → B → C → B → A → B → C →B → A
A. 1 vibration
B. 1 ¼ vibrations
C. 1 ½ vibrations
D. 2 vibrations
If a pendulum swings from point D-E-F-E-D in 1/60 second, what is the period of the pendulum?
A. 1/120 s
B. 1/80 s
C. 1/60 s
D. 1/30 s
If a bird chirps 120 times in 60 seconds, what is the frequency of its chirping?
A. 1 Hz
B. 2 Hz
C. 3 Hz
D. 4 Hz
In which medium sound can't travel?
solid
liquid
gas
vacuum
What is ultrasound?
Sound with a frequency higher than 20.000 Hz
Sound with a frequency lower than 20 Hz
Sound with a frequency 20 Hz
sound with a frequency 20.000 Hz
What is the range of frequencies audible to the human ear
lower than 20 Hz
20 Hz - 20.000 Hz
higher than 20.000 Hz
0 Hz - infinite Hz
Based on the table above, the materials that can be absorbed are on numbers … .
1 and 2
2 and 4
1 and 3
3 and 4
Echo is ...
sound reflection that is heard before the end of the
original sound.
sound reflection that is heard after the end of the original
sound.
the number of vibrations per second
the maximum distance taken by a particle of medium
Observe the image showing a spring with a load that is vibrating. The spring and the load perform one vibration when moving from...
A-B-C-B-A
A-B-C-A-B
B-A-C-A-B
C-B-A-B-C
A boat is using echo-sounding equipment to measure the depth of the water underneath.
The equipment in the boat sends a short pulse of sound downwards and detect the echo after a time interval 4 seconds. The speed of sound in water is 1500 m/s. Calculate the depth of water!
6000 m
5800 m
3000 m
2600 m
A sonar system on a boat sends an ultrasound pulse towards the seabed. The pulse is reflected, and it is detected 0.2 s later by the system. Calculate the depth of water if the speed of sound in water is 1 480 m/s.
148 m
296 m
14 800 m
Cahaya dapat merambat lurus
Light can travel in straight line
Betul
True
Salah
False
What type of reflection is shown in the image?
Regular reflection
Diffuse reflection
Total internal reflection
If the angle of incidence is 25 degrees, the angle of reflection is
20 degrees
25 degrees
50 degrees
90 degrees
If a 2.5 m object is placed in front of a plane mirror, the height of its image is
less than 2.5 m
2.5 m
more than 2.5 m
0
When the image of an object is seen in a plane mirror, the image is _____.
real and upright.
real and inverted.
virtual and upright.
virtual and inverted.
which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in the figure 10.6?
A
B
C
D
What will be the position of the image of the object AB in the figure?
At Infinity
Between F and C
At C
Between F and P
(Multiple Choice) Image of the convex
mirror can be-
Upright
Virtual
Minimized
Maximized
Real
Why can we not use concave mirrors as side mirrors for automobiles?
Because concave mirrors produces varying images at different distances
Because concave mirrors collects too much dust because of its shape
Concave mirrors produces small images which cannot be seen by the driver
Concave mirrors are only used for flashlights
A dentist uses a small dental mirror to help magnify teeth in your mouth. What type of mirror is this?
a convex mirror
a concave mirror
a convex lens
a concave lens
The radius of curvature of a spherical mirror is 20 cm, What is its focal length?
20 cm
10 cm
40 cm
1/20 cm
Which terms describe the reflection seen in this image?
virtual, upright
virtual, inverted
real, upright
real, inverted
A student placed a pencil in a cup of water. The pencil appears broken because light
always travels in a straight line.
bends when it passes through water.
makes the water in the glass evaporate.
reflects the pencil on the water's surface.
Based on the image, which medium has a larger index of refraction?
Medium 1 has a larger index of refraction.
Medium 2 has a larger index of refraction.
Both mediums have the same index of refraction.
Cannot be determined.
Angle of incidence is smaller than the angle of refraction.
True.
False.
I don't know.
The diagram shows a ray of light incident on the edge of a piece of glass. The angle i is bigger than the critical angle.
Which arrow correctly shows the direction of the ray after it leaves the edge of the glass?
A
B
C
D
The diagram shows light travelling from glass to air.
What is the angle of refraction for this ray of light?
20°
40°
50°
70°
On the diagram A is :
The angle of incidence
The reflection ray
The incidence ray
The refraction ray
On the diagram, B is:
The refraction ray
The normal
The angle of incidence
The incidence ray
Why do we see grass as green?
Green light is absorbed
Green light is reflected
The angle of reflection is
90 degrees
55 degrees
45 degrees
135 degrees
Which type of medium is needed for refraction of light?
Transparent
Translucent
Opaque
None of these
What makes objects visible ?
the absorption of light by objects
the reflected light from the object
the total internal reflection taking place in an object
What happens to a ray parallel to the principal axis after reflection in a concave mirror?
It passes through the focus
It appears to come from the focus
It gets reflected parallel to the principal axis
It gets absorbed by the mirror
The size of an object and its image are the same in this type of mirror...
Plane
Convex
Concave
When an object is placed between two mirrors kept perpendicular to each other ,the number of images formed is
2
3
4
infinite
The Second law of reflection states that the angle of ________ is equal to the angle of ___________
Incidence, refraction
Normal, Incidence
incidence, reflection
refraction , incidence
This ruler looks like it is broken because of light refraction. What property of light causes refraction?
Light travels at different speeds through different medium
Light is magically and produced by rainbow
Light makes objects float in water
Light is reflecting the rulers in the water
