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