Physics for IGCSE & O level - Rays And Waves (Section 2)
1
What is the term for the bending of light around obstacles?
2
What is the role of the iris in the eye?
Απάντηση(B)
To control the amount of light entering the eye
3
What are the advantages of using digital signals?
4
What is the name of the process that converts an analogue signal into a digital signal?
5
What happens when light refracts?
6
What kind of image does a convex lens typically create?
7
What happens to a light ray when it enters a denser medium, like glass?
8
What happens to light as it travels from a less dense medium to a more dense medium?
Απάντηση(B)
It slows down and bends towards the normal
9
What type of image can be formed on a screen?
10
In the context of waves, what does 'refraction' mean?
Απάντηση(A)
The bending of a wave as it passes from one medium to another.
11
What is the key process by which fiber optics work?
Απάντηση(C)
Total Internal Reflection
12
What does a decoder do in a communication system?
Απάντηση(B)
Converts electrical signals into sound.
13
Which of the following are examples of electromagnetic waves?
14
What is a common use of X-rays?
15
Which of these are forms of electromagnetic radiation?
16
Which of the following are the features of light?
17
In which medium does light travel the fastest?
18
What happens to the direction of light when it enters a glass block?
Απάντηση(A)
It bends towards the normal
19
How does the color of light change when it refracts?
20
Which part of the electromagnetic spectrum is used for satellite communication?
21
What is the name of the angle at which the light ray strikes a mirror?
22
What is the main concept behind the working of a periscope?
23
Which of the following are needed for the image in a plane mirror to appear?
Απάντηση(A)
A light source, mirror, and observer
24
What are the components of a simple telephone system?
Απάντηση(B)
Microphone, encoder, transmission path, decoder and earphone
25
What type of lens is used to create a magnifying glass?
26
What happens to the frequency of light when it travels from one medium to another?
27
In a phone system, which device converts electrical signals into sound?
28
What type of lens converges light rays?
29
What is the primary use of optical fibers?
Απάντηση(B)
To carry signals for communication.
30
What will happen to the speed of the wave when the frequency of wave is increased?
31
What type of lens is associated with causing light to converge?
32
What effect do microwaves have on the human body?
Απάντηση(B)
They can cause internal heating.
33
What happens to the angle of refraction as the angle of incidence increases?
34
Which of the following is an application of RFID?
Απάντηση(B)
Identifying goods in shops
35
Which of these can detect radio waves?
36
Which color of visible light has the shortest wavelength?
37
What is the purpose of an endoscope?
38
What does total internal reflection involve?
39
What type of lens is used to correct long-sightedness?
40
Which one is a key difference between real and virtual images in a plane mirror?
Απάντηση(B)
Real images can be projected onto a screen, while virtual images cannot.
41
What is the relationship between the speed of light and the refractive index?
Απάντηση(B)
They are inversely proportional.
42
If you see a rainbow, what phenomenon are you witnessing?
Απάντηση(B)
Refraction and dispersion
43
Which of these statements are true about electromagnetic waves?
44
What happens to the frequency of an electromagnetic wave when its wavelength decreases?
45
What can microwaves cause if the body is exposed to them?
46
What is the formula for the refractive index?
Απάντηση(B)
Speed of light in vacuum / Speed of light in medium
47
What is the role of a decoder in a communication system?
Απάντηση(B)
To convert electrical signals back into sound.
48
What is the cause of short sight or myopia?
49
If a light ray is traveling along the normal, what is the angle of incidence?
50
What does the term "UHF" stand for?
