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Physics for IGCSE & O level - Rays And Waves (Section 5)

1
What is a virtual image?
Answer
(B)
An image that appears to come from behind the mirror
2
What is the term for the angle of incidence for which the angle of refraction is 90 degrees?
Answer
(B)
Critical angle
3
What are examples of uses of radio waves?
Answer
A
B
4
What is an application of total internal reflection?
Answer
(C)
Fiber optics
5
What happens to light when it passes through a glass block?
Answer
(B)
It slows down.
6
What does refraction refer to?
Answer
(B)
The bending of light
7
What are the potential dangers of X-rays?
Answer
A
B
8
Which of the following types of electromagnetic waves cause ionization?
Answer
B
C
9
Which part of the electromagnetic spectrum is used for remote controls?
Answer
(A)
Infrared
10
In an optical fiber, what phenomenon keeps the light inside the fiber?
Answer
(C)
Total internal reflection
11
In a simple telephone system, what does the decoder do?
Answer
(A)
Converts electrical signals into sound
12
What is the meaning of the term "digital signal"?
Answer
(B)
A signal represented by numbers.
13
Which type of lens is used in a telescope?
Answer
(A)
Convex
14
Which of the following is the best definition of the 'normal' line?
Answer
(C)
A line perpendicular to the surface at the point of incidence
15
What is the unit of measurement for the refractive index?
Answer
(C)
No unit
16
What is a virtual image?
Answer
(B)
An image that cannot be projected onto a screen.
17
In a plane mirror, the image appears to be where?
Answer
(A)
Behind the mirror
18
What type of lens is a diverging lens?
Answer
(B)
A concave lens
19
In short sight, where does the image focus?
Answer
(A)
In front of the retina
20
What type of radiation is used to detect heat?
Answer
(B)
Infrared
21
Which of the following is an example of total internal reflection?
Answer
(B)
An optical fiber
22
What is the function of the transmission path in a phone system?
Answer
(B)
To transmit information over a distance.
23
What is the role of an antenna in radio communication?
Answer
(B)
To convert electrical signals into radio waves
24
What is the role of the pupil in the human eye?
Answer
(B)
Controlling light entry
25
What type of image can be projected onto a screen?
Answer
(B)
Real
26
How can the frequency of light increase?
Answer
(D)
Both b and c
27
What is the key feature of digital signals?
Answer
(B)
They are represented by numbers.
28
What do we call the device that converts electrical signals into a form that can be transmitted?
Answer
(B)
Encoder
29
Which part of the electromagnetic spectrum is visible to the human eye?
Answer
(C)
Visible Light
30
What type of lens forms a real image?
Answer
(A)
Convex lens
31
How does light bend when it passes from a less dense to a more dense medium?
Answer
(B)
Towards the normal
32
What is the angle of reflection in relation to the angle of incidence?
Answer
(C)
It is the same.
33
What is a benefit of using optical fibres?
Answer
(B)
They can transmit signals over long distances with minimal signal loss.
34
What type of wave is an electromagnetic wave?
Answer
(A)
Transverse
35
What is the purpose of an encoder in telecommunications?
Answer
(B)
To convert information into a transmittable format
36
What is the name given to the light that does not hit the surface?
Answer
(A)
Incident ray
37
What is the normal in relation to a reflecting surface?
Answer
(B)
A line perpendicular to the surface
38
What is the role of an antenna in a radio system?
Answer
(B)
To convert radio waves into electrical signals and vice versa
39
What is the basic principle behind an endoscope?
Answer
(C)
Total internal reflection
40
Which type of electromagnetic radiation is used by mobile phones?
Answer
(B)
Microwaves
41
Which of the following are uses for optical fibers?
Answer
A
B
C
42
What does the refractive index of a material indicate?
Answer
(C)
The amount light is bent by the material
43
Which color of light has the highest frequency?
Answer
(C)
Blue
44
What form of radiation is used for medical imaging?
Answer
(C)
X-rays
45
Which of the following correctly describes the relationship between energy and frequency in electromagnetic waves?
Answer
(B)
Energy is directly proportional to frequency
46
What is a common use of infrared radiation?
Answer
(B)
To detect heat
47
What causes light to change direction when it enters a new medium?
Answer
(B)
Refraction
48
When does light travel in straight lines?
Answer
A
B
C
49
What happens to light when it passes through a prism?
Answer
(C)
It splits into a range of colors.
50
Which of the following is used in fiber optic communication?
Answer
(D)
Total Internal Reflection