Physics for IGCSE & O level - Rays And Waves (Section 8)
1
An object is placed in front of a plane mirror. How will the image size compare to the object's size?
Απάντηση
(C)
The same size
2
What happens when light travels from a less dense medium to a more dense medium?
Απάντηση
(D)
Both A and C
3
Which lens type is commonly used in cameras?
Απάντηση
(B)
Converging lens
4
What kind of waves do mobile phones use?
Απάντηση
(B)
Microwaves
5
What are some of the properties of electromagnetic waves that travel from a source?
Απάντηση
A
B
C
6
In the eye, the lens changes shape to focus images. What is this process called?
Απάντηση
(A)
Accommodation
7
What is the speed of light in 300,000 km/s in?
Απάντηση
(C)
vacuum
8
What can cause ionization?
Απάντηση
A
B
9
What will happen to the light when the angle of incidence is less than the critical angle?
Απάντηση
(B)
Refraction will occur
10
What are some uses for Infrared radiation?
Απάντηση
B
D
11
Which of the following is a form of radiation?
Απάντηση
(B)
Light
12
Which of the following is a true statement about image size in a plane mirror?
Απάντηση
(C)
The image is the same size as the object.
13
What is the name of the angle between the reflected ray and the normal?
Απάντηση
(C)
Angle of reflection
14
What happens to the angle of refraction when the incident light travels from a medium with a lower refractive index to a medium with a higher refractive index?
Απάντηση
(C)
The angle of refraction is less than the angle of incidence.
15
Which of the following are uses of lenses?
Απάντηση
A
B
C
16
What is the angle formed by the reflected ray and the normal called?
Απάντηση
(B)
Angle of reflection
17
In a plane mirror, if the object is 2 meters away from the mirror, where will the image form?
Απάντηση
(B)
2 meters behind the mirror
18
What does the term 'UHF' stand for?
Απάντηση
(A)
Ultra High Frequency
19
What is a form of radiation?
Απάντηση
A
B
20
What is the primary function of a transmitting antenna in a radio system?
Απάντηση
(C)
To emit radio waves
21
What is the main function of a microphone in a telephone system?
Απάντηση
(B)
To convert sound into electrical signals.
22
If the angle of incidence is 30 degrees, what is the angle of reflection?
Απάντηση
(B)
30 degrees
23
What kind of images are formed in a plane mirror?
Απάντηση
(B)
Virtual images
24
What are rays used to represent?
Απάντηση
(A)
The direction of light
25
What happens to light when the angle of incidence is less than the critical angle?
Απάντηση
(B)
Refraction
26
Which term describes a lens that makes objects appear larger?
Απάντηση
(B)
Magnifying lens
27
In which scenario would you observe a rainbow?
Απάντηση
(B)
When sunlight hits raindrops
28
What is the process called when light bends as it passes through one medium to another?
Απάντηση
(B)
Refraction
29
Which factor does the value of critical angle depend on?
Απάντηση
(B)
Material
30
What is the function of the crystalline lens in the eye?
Απάντηση
(B)
To refract and focus light onto the retina.
31
What are the two laws of reflection?
Απάντηση
A
B
32
What are the common uses of RFID?
Απάντηση
(D)
All of the above.
33
In which type of reflection are the light rays parallel to each other after reflecting?
Απάντηση
(B)
Specular reflection
34
What is the relationship between the incident ray and the reflected ray?
Απάντηση
(B)
They form equal angles with the normal.
35
Which of the following are features of light?
Απάντηση
A
B
C
36
What phenomenon is responsible for a pencil appearing bent when partially submerged in water?
Απάντηση
(B)
Refraction
37
Which of the following is an example of a transverse wave?
Απάντηση
(B)
Water waves
38
Which of the following are examples of radio waves?
Απάντηση
(D)
All of the above
39
Which of these is required for sight?
Απάντηση
(B)
Light
40
What are some uses of optical fibers?
Απάντηση
A
B
41
Which type of radiation can cause fluorescence?
Απάντηση
(B)
Ultraviolet radiation
42
What effect does a converging lens have on parallel light rays?
Απάντηση
(B)
Causes them to converge at the focal point.
43
Which of the following materials will likely reflect the most light?
Απάντηση
(B)
White paper
44
What is the angle of incidence equal to?
Απάντηση
(B)
The angle of reflection
45
Which of the following is the unit for the speed of light?
Απάντηση
(A)
m/s
46
When light encounters a rough surface, what type of reflection occurs?
Απάντηση
(C)
Diffuse reflection
47
If an object is closer to a convex lens than the principal focus, what type of image is formed?
Απάντηση
(D)
Virtual, upright
48
What are the two main factors linked to the properties of light?
Απάντηση
B
C
49
What is the effect of a converging lens on light rays?
Απάντηση
B
C
D
50
What is the name of the angle between the incident ray and the normal?
