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