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Physics for IGCSE & O level - Rays And Waves (Section 4)

1
Which part of the electromagnetic spectrum has a shorter wavelength than visible light?
Answer
(B)
Ultraviolet
2
What is a diverging lens also known as?
Answer
(B)
Concave lens
3
Which of the following is a component of the eye that helps focus light?
Answer
(C)
The lens
4
What kind of image can be formed on a screen?
Answer
(A)
A real image
5
What is the relationship between wavelength and frequency?
Answer
(B)
They are inversely proportional.
6
What type of lens is used in a magnifying glass?
Answer
(A)
Convex
7
What term is used to describe the separation of white light into its different colors?
Answer
(C)
Dispersion
8
Which type of electromagnetic wave has the highest frequency?
Answer
(C)
X-rays
9
Which of the following types of radiation are used in medical imaging?
Answer
B
D
10
Which part of the electromagnetic spectrum has the shortest wavelength?
Answer
(C)
X-rays
11
What property makes optical fibres suitable for communications?
Answer
(C)
They can carry pulses of light.
12
How does the speed of light change as it enters a denser medium?
Answer
(B)
It decreases.
13
Which of the following is the range of the electromagnetic spectrum that our eyes can detect?
Answer
(B)
Visible light
14
What type of lens is used to correct long sight?
Answer
(A)
Convex lens
15
What phenomenon is responsible for rainbows?
Answer
(C)
Refraction and dispersion
16
What does a prism do to white light?
Answer
(C)
Disperses it into its component colors
17
What type of lens is used to produce a real image?
Answer
(A)
Convex lens
18
What is a major advantage of digital transmission over analogue transmission?
Answer
(C)
Better signal quality over long distances
19
Which of the following can cause fluorescence?
Answer
(B)
Ultraviolet light
20
In what condition does total internal reflection occur?
Answer
(B)
When light passes from a more dense medium to a less dense medium.
21
What type of signal does an optical fibre carry?
Answer
(C)
Pulses of light
22
What is the main function of optical fibers?
Answer
(C)
To transmit light efficiently over long distances
23
What is the role of the film or image sensor in a camera?
Answer
(C)
To capture the image
24
What type of image can be projected onto a screen?
Answer
(B)
Real image
25
What do white surfaces do to light?
Answer
(A)
Reflect most light and look bright
26
What are the main uses of optical fibres?
Answer
A
C
27
What does 'VHF' stand for?
Answer
(A)
Very High Frequency
28
What is the main function of the encoder in a phone?
Answer
(A)
To convert sound waves into electrical signals.
29
What type of image is formed by the eye on the retina?
Answer
(A)
Real and inverted
30
Which of these best describes the direction of the electric and magnetic fields in an electromagnetic wave?
Answer
(B)
Perpendicular to each other and perpendicular to the direction of propagation.
31
Which of the following is a property of electromagnetic waves?
Answer
B
C
32
What is the critical angle?
Answer
(B)
The angle of incidence at which refraction is 90 degrees.
33
What part of the eye is responsible for accommodation (changing the focal length)?
Answer
(B)
Lens
34
If the refractive index is 1.5, and the angle of incidence is 30 degrees, what is the angle of refraction?
Answer
(A)
19.5 degrees
35
What does the term 'refraction' refer to in optics?
Answer
(B)
The bending of light as it passes between media.
36
What is the function of the shutter in a camera?
Answer
(B)
To control the amount of light entering the camera.
37
What are the main components of a telephone?
Answer
(B)
Microphone, encoder, transmission path, decoder, earphone
38
What type of electromagnetic wave is used for communication?
Answer
(C)
Radio waves
39
If the angle of incidence is 0 degrees, what is the angle of reflection?
Answer
(C)
0 degrees
40
What does the term 'dispersion' of light refer to?
Answer
(A)
The splitting of white light into its different colors
41
What is a crucial characteristic of the critical angle?
Answer
(B)
The angle of refraction is 90 degrees.
42
What is the focal point of a convex lens?
Answer
(A)
Where light rays converge
43
When light passes through a prism, the different colors of light are separated because...
Answer
(A)
They have different speeds.
44
Which type of radiation is associated with the sun and can cause skin cancer?
Answer
(B)
Ultraviolet radiation
45
In a medium, which property of light is affected when refraction occurs?
Answer
(B)
Its speed
46
What happens to the wavelength of light when it passes through a prism?
Answer
(D)
It changes color
47
What type of lens is used to correct short-sightedness?
Answer
(B)
A concave lens
48
How do microwaves cause internal heating?
Answer
(B)
They increase the motion of water molecules
49
Which of the following is a property of all electromagnetic waves?
Answer
(B)
They travel at the same speed in a vacuum.
50
If light strikes a surface at a 45-degree angle, what is the angle of reflection?
Answer
(B)
45 degrees