Sign In

Physics for IGCSE & O level - Rays And Waves (Section 1)

1
What is used to sterilize equipment?
Answer
(B)
Ultraviolet
2
Which of the following is a characteristic of a digital signal?
Answer
(B)
Represented by numbers
3
What type of lens causes light rays to diverge?
Answer
(B)
Concave
4
What happens to the wavelength of light when its frequency increases?
Answer
(B)
Decreases
5
What is the term given to the light rays that travel parallel to the principal axis and hit a convex lens?
Answer
(C)
Standard rays
6
Which waves have the shortest wavelengths?
Answer
(D)
X-rays
7
Which of the following statements is true about the speed of light?
Answer
(C)
It is slower in denser mediums.
8
In total internal reflection, which angle is important?
Answer
(B)
The critical angle
9
What is the primary function of an optical fiber?
Answer
(B)
To transmit light and signals
10
What is the incident ray?
Answer
(B)
The light ray that is traveling towards the surface.
11
What type of radiation is used for sterilization in certain applications?
Answer
(B)
Ultraviolet radiation
12
Which of the following is a characteristic of electromagnetic waves?
Answer
(C)
They can travel through a vacuum
13
What is the angle between the incident ray and the normal called?
Answer
(C)
Angle of incidence
14
What type of lens is used to correct long sight?
Answer
(B)
Convex
15
In which medium does light travel fastest?
Answer
(D)
Vacuum
16
What happens to the direction of light when it bounces off a mirror?
Answer
(C)
It changes direction
17
What happens to light traveling from a more dense to a less dense medium at an angle of incidence greater than the critical angle?
Answer
(C)
Total internal reflection occurs
18
Which component of the eye controls the amount of light entering?
Answer
(C)
Iris
19
What is the critical angle?
Answer
(B)
The angle of incidence at which total internal reflection occurs
20
Which part of the electromagnetic spectrum is used for remote controls?
Answer
(A)
Infrared
21
Which of the following are used for wireless communications?
Answer
(B)
Radio waves
22
What happens to the light's wavelength when the refractive index of a medium is higher?
Answer
(B)
The wavelength decreases.
23
What type of electromagnetic radiation can cause fluorescence?
Answer
(B)
Ultraviolet
24
What is the definition of angle of incidence?
Answer
(B)
The angle between the incident ray and the normal.
25
What happens to the direction of light as it travels from a less dense to a more dense medium?
Answer
(A)
Bends towards the normal
26
Which of the following are examples of electromagnetic radiation?
Answer
A
B
D
27
What is the definition of a medium?
Answer
(B)
Any substance through which light can travel
28
What does the the term 'reflection' refer to?
Answer
(A)
The bouncing back of light from a surface
29
Which of the following is an example of how reflection is used?
Answer
A
B
30
Which part of the eye focuses light onto the retina?
Answer
(C)
Lens
31
What do we call the angle at which the light strikes the surface?
Answer
(A)
angle of incidence
32
Which of the following is a good example of the practical use of reflection?
Answer
(C)
A periscope
33
What is the speed of light in a vacuum?
Answer
(C)
300,000 km/s
34
In what part of the eye are photoreceptor cells located?
Answer
(C)
Retina
35
In a vacuum, what is the speed of all electromagnetic waves?
Answer
(B)
300,000 km/s
36
Which of these does NOT involve refraction?
Answer
(C)
A reflection in a mirror
37
Which of the following is the unit of frequency?
Answer
(A)
Hertz (Hz)
38
What happens to the speed of light in a vacuum?
Answer
(B)
It is approximately 300,000 km/s.
39
Which of the following is a property of electromagnetic waves?
Answer
(B)
They transfer energy.
40
Which of the following statements is true about the image formed by a plane mirror?
Answer
(C)
It is always virtual.
41
What is the relationship between wavelength and frequency of a wave?
Answer
(B)
They are inversely proportional
42
Which of the following is a characteristic of a real image?
Answer
(C)
It can be projected onto a screen.
43
In a plane mirror, what is the relationship between the object and the image?
Answer
(B)
The image is the same size as the object.
44
What causes the separation of white light into its colors?
Answer
(B)
Refraction and dispersion
45
What are the main advantages of using digital signals for communication?
Answer
A
B
46
Which type of wave has the shortest wavelength?
Answer
(D)
Gamma rays
47
What does a convex lens do to light rays?
Answer
(B)
Makes them converge
48
Which of the following is a good application for refraction?
Answer
(C)
Lenses
49
Which of the following is related to the phenomenon of total internal reflection?
Answer
A
B
50
Which of the following is used to correct short sight?
Answer
(B)
Concave lens