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Physics for IGCSE & O level - Rays And Waves (Section 9)

1
What is the definition of a virtual image?
Answer
(C)
An image that cannot be formed on a screen.
2
Which type of electromagnetic radiation is most dangerous?
Answer
(C)
X-rays
3
What kind of light does the sun emit?
Answer
(D)
All of the above.
4
What best explains why a pencil appears bent when partially submerged in water?
Answer
(B)
Refraction of light
5
What is the unit of refractive index?
Answer
(B)
dimensionless
6
Which of these devices use lenses?
Answer
A
B
C
7
What is the angle between the reflected ray and the surface?
Answer
(D)
It is not defined
8
What type of radiation can cause sunburn?
Answer
(B)
Ultraviolet radiation
9
What is the primary function of a photo diode within an optical fibre system?
Answer
(C)
To convert light signals to electrical signals.
10
What is the result of passing white light through a prism?
Answer
(C)
The light is split into its component colours.
11
What are some of the benefits of digital transmission?
Answer
A
B
C
D
12
What is a key advantage of using optical fibers for data transmission?
Answer
(A)
They are less susceptible to interference.
13
What can you say about real images formed with a convex lens?
Answer
(D)
Always real and inverted.
14
What type of reflection occurs when the surface is irregular?
Answer
(B)
Diffuse reflection
15
Which color of light has the longest wavelength?
Answer
(A)
Red
16
What type of image does the eye form?
Answer
(B)
Real and inverted
17
What does the encoder in a telephone system do?
Answer
(B)
Converts sound into electrical signals
18
If the angle of incidence is 0 degrees, what is the angle of reflection?
Answer
(C)
0 degrees
19
In a simple radio system, what part of the radio system receives the pulsations?
Answer
(C)
Receiving antenna.
20
What term describes the change in direction of light as it passes from one medium to another?
Answer
(B)
Refraction
21
What is the main role of raindrops in the formation of a rainbow?
Answer
(B)
They act as a prism
22
Which type of lens is used in a magnifying glass?
Answer
(B)
Convex
23
What phenomenon causes white light to split into its constituent colours?
Answer
(C)
Dispersion
24
Which type of lens is used to correct long sight (hyperopia)?
Answer
(B)
Convex lens
25
What type of reflection does a mirror perform?
Answer
(B)
Regular reflection
26
Which of these statements are correct in respect to light?
Answer
A
B
C
27
What is the formula relating speed, wavelength, and frequency of a wave?
Answer
(B)
speed = wavelength * frequency
28
What part of the electromagnetic spectrum has the shortest wavelengths?
Answer
(C)
Gamma rays
29
Which type of waves are used to transmit data for Bluetooth connections?
Answer
(C)
Microwaves
30
What happens to light that does not enter your eyes?
Answer
(B)
It is reflected or absorbed.
31
What are the units of measurement for speed of light?
Answer
(D)
Both m/s and km/s
32
What is the relationship between wavelength and frequency?
Answer
(B)
They are inversely proportional.
33
What causes the bending of light?
Answer
(B)
Refraction
34
What do the raindrops act like in the formation of a rainbow?
Answer
(B)
Prisms
35
What is the angle between the incident ray and the surface called?
Answer
(D)
It is not defined
36
When does total internal reflection occur?
Answer
(B)
When light moves from a more dense to a less dense medium at an angle of incidence greater than the critical angle.
37
What is an example of using wireless transmission?
Answer
(B)
Using radio waves
38
Which type of lens is used to correct myopia?
Answer
(B)
Concave lens
39
What is formed in a camera?
Answer
(C)
Real and inverted image
40
What does the term "incident ray" refer to?
Answer
(B)
The ray of light that strikes a surface.
41
What is the name for the type of image formed by a convex lens that can be projected onto a screen?
Answer
(B)
Real image
42
What type of electromagnetic waves are used in medical X-rays?
Answer
(C)
X-rays
43
Which of the following are used for remote controllers for TVs?
Answer
(C)
Infrared light
44
What is the purpose of a decoder in a telephone system?
Answer
(B)
To convert electrical signals into sound.
45
What does RFID stand for?
Answer
(A)
Radio Frequency Identification
46
What determines the refractive index of a material?
Answer
(A)
The speed of light in the material.
47
How does light appear to move?
Answer
(C)
In both waves and rays
48
Which part of the electromagnetic spectrum has the longest wavelength?
Answer
(C)
Radio waves
49
Which of the following are properties of electromagnetic waves?
Answer
A
B
D
50
What does refraction of light depend on?
Answer
(A)
The medium it passes through