Name: _______________________________
Date: ________________________________
SNC2P – Sources of Light
Use the figure below to answer questions (1-7) (20 marks/ 1 mark each)
1) Compared to ultraviolet waves, the wavelength of infrared waves is:
A. Shorter
B. Longer
C. Faster
D. Slower
E. The same
2) Gamma rays considered to be dangerous because:
A. It has longer wavelength
B. It is located the far right hand side of the spectrum
C. It has more energy
D. It has lower frequency
3) What type of waves are used on a TV remote control?
A. Radio waves
B. Microwaves
C. Ultraviolet
D. Infrared rays
4) These waves are absorbed by water molecules in the food:
A. Visible light
B. X-rays
C. Microwaves
D. Ultraviolet
Colour Theory
5) When red light and green light shine on the same place on a piece of white paper, the spot appears to be...
A. Yellow
B. Brown
C. White
D. Black
Name: _______________________________
Date: ________________________________
6) If you shine white light through a yellow filter flowed by a green filter, what colour of light will you end up with?
A. Black
B. Yellow
C. Green
D. Red
7)
On TV screen, the pixels are 1/3 red, 1/3 blue and 1/3 green. If you want to have yellow light, which parts of the
pixel have to glow more brightly than the others?
A. All three parts
B. The red and green parts
C. The green and blue parts
D. The red and blue parts
8) Why does Miss Klaibi’s violet bracelet appears violet?
A. It absorbs red but reflect green and blue
B. It absorbs blue and red but reflect green
C. It absorbed blue and reflect red and green
D. It absorbs green but reflect blue and red
9) A red tomato appears to be which colour under green light
A. Purple
B. Cyan
C. Black
D. Red
Light Sources
10) Which of the flowing is LED bulb? (Circle the letter associated with the correct answer)
11) Some Halloween make-ups contains chemicals that glow in the dark after they are exposed to light. These makeups are an example of:
A. Fluorescence
B. Chemiluminescence
C. Bioluminescence
D. Phosphorescence
12) What type of light requires an electrical discharge?
A. Neon sign
B. Plasma screen
C. Liquid crystal display
D. Led display
Name: _______________________________
Date: ________________________________
13) How does an incandescent light bulb work?
A. A thin metal filament glows when it is heated
B. A substance glows after being exposed to energised particles
C. A gas glows when electricity passes through it
D. A crystal glows when it is crushed
14) Which type of light is created when an electric current pass through a gas?
A. Fluorescent
B. LED
C. Incandescent
D. Electric discharge
15) These jellyfish glow in the dark because a special chemical reaction in their bodies creates light.
A. Fluorescence
B. Bioluminescence
C. Triboluminescence
D. phosphorescence