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Physics for IGCSE & O level - Rays And Waves (Section 2)

1
What is the term for the bending of light around obstacles?
Answer
(C)
Diffraction
2
What is the role of the iris in the eye?
Answer
(B)
To control the amount of light entering the eye
3
What are the advantages of using digital signals?
Answer
A
B
4
What is the name of the process that converts an analogue signal into a digital signal?
Answer
(C)
Sampling
5
What happens when light refracts?
Answer
(C)
It changes direction.
6
What kind of image does a convex lens typically create?
Answer
(A)
Real and inverted
7
What happens to a light ray when it enters a denser medium, like glass?
Answer
(B)
It slows down.
8
What happens to light as it travels from a less dense medium to a more dense medium?
Answer
(B)
It slows down and bends towards the normal
9
What type of image can be formed on a screen?
Answer
(B)
Real only
10
In the context of waves, what does 'refraction' mean?
Answer
(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?
Answer
(C)
Total Internal Reflection
12
What does a decoder do in a communication system?
Answer
(B)
Converts electrical signals into sound.
13
Which of the following are examples of electromagnetic waves?
Answer
B
C
14
What is a common use of X-rays?
Answer
(B)
Medical imaging
15
Which of these are forms of electromagnetic radiation?
Answer
A
B
C
16
Which of the following are the features of light?
Answer
A
B
C
D
17
In which medium does light travel the fastest?
Answer
(C)
Vacuum
18
What happens to the direction of light when it enters a glass block?
Answer
(A)
It bends towards the normal
19
How does the color of light change when it refracts?
Answer
(C)
The color never changes
20
Which part of the electromagnetic spectrum is used for satellite communication?
Answer
(B)
Microwaves
21
What is the name of the angle at which the light ray strikes a mirror?
Answer
(B)
Angle of incidence
22
What is the main concept behind the working of a periscope?
Answer
(B)
Reflection
23
Which of the following are needed for the image in a plane mirror to appear?
Answer
(A)
A light source, mirror, and observer
24
What are the components of a simple telephone system?
Answer
(B)
Microphone, encoder, transmission path, decoder and earphone
25
What type of lens is used to create a magnifying glass?
Answer
(A)
Convex
26
What happens to the frequency of light when it travels from one medium to another?
Answer
(C)
It remains the same.
27
In a phone system, which device converts electrical signals into sound?
Answer
(B)
Earphone
28
What type of lens converges light rays?
Answer
(A)
Convex lens
29
What is the primary use of optical fibers?
Answer
(B)
To carry signals for communication.
30
What will happen to the speed of the wave when the frequency of wave is increased?
Answer
(C)
Remains constant
31
What type of lens is associated with causing light to converge?
Answer
(A)
Convex lens
32
What effect do microwaves have on the human body?
Answer
(B)
They can cause internal heating.
33
What happens to the angle of refraction as the angle of incidence increases?
Answer
(A)
Increases
34
Which of the following is an application of RFID?
Answer
(B)
Identifying goods in shops
35
Which of these can detect radio waves?
Answer
(A)
Radio telescopes
36
Which color of visible light has the shortest wavelength?
Answer
(C)
Blue
37
What is the purpose of an endoscope?
Answer
(B)
To view inside the body
38
What does total internal reflection involve?
Answer
(C)
Only reflection
39
What type of lens is used to correct long-sightedness?
Answer
(A)
Convex lens
40
Which one is a key difference between real and virtual images in a plane mirror?
Answer
(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?
Answer
(B)
They are inversely proportional.
42
If you see a rainbow, what phenomenon are you witnessing?
Answer
(B)
Refraction and dispersion
43
Which of these statements are true about electromagnetic waves?
Answer
B
C
44
What happens to the frequency of an electromagnetic wave when its wavelength decreases?
Answer
(A)
Increases
45
What can microwaves cause if the body is exposed to them?
Answer
(A)
Internal heating
46
What is the formula for the refractive index?
Answer
(B)
Speed of light in vacuum / Speed of light in medium
47
What is the role of a decoder in a communication system?
Answer
(B)
To convert electrical signals back into sound.
48
What is the cause of short sight or myopia?
Answer
(B)
The eyeball is too long.
49
If a light ray is traveling along the normal, what is the angle of incidence?
Answer
(A)
0 degrees
50
What does the term "UHF" stand for?
Answer
(A)
Ultra High Frequency