Magnetism
Light
Colors
Bulbs
Random
100
a coil of wire wound around a soft iron core.
What is electromagnet
100
Light is made up of waves called
What is electromagnetic waves.
100
Another name for White light is?
What is Sunlight
100
How many types of bulbs are there? Please give the names.
What is 2. Incandescent bulb & Fluorescent bulb
100
Made by combining two of the primary colors
What is secondary colors
200
How many poles are there on a magnet? What are the names?
What is 2, North and South Poles
200
Two types of lights are
What is Natural and Artificial
200
Instrument used to separate white light?
What is prism
200
When electric current passes through the filament the temperature rises to _______________________.
What is When electric current passes through the filament the temperature rises to 2000 – 3000C.
200
On cranes in steel works Scrap yards to lift iron and steel objects In hospital to remove splinters from the eye In many electrical devices
What is Uses of Electromagnets
300
Opposite poles___________ & Same poles_____________
What is Attract & Repel
300
Three things that can happen to light waves
What is transmit, reflect and absorbed.
300
These colors make up sunlight
What is red, orange, yellow, green, blue, indigo and violet
300
Made of a glass tube containing a gas – _________ and _____________
What is Made of a glass tube containing a gas – argon and mercury
300
R + G = R + B = G + B =
What is R + G = Yellow R + B = Magenta G + B = Cyan
400
increasing the current in the coil increasing the number of turns on the coil moving the poles of the electromagnet closer together
What is Ways in which we can increase the strength of an electromagnet
400
In dim light the pupil is ______________
What is enlarged
400
red, blue, green
What is primary colors
400
_______________ light is dangerous because it can damage the retina, it also wastes energy)
What is UV light is dangerous because it can damage the retina, it also wastes energy)
400
Any two colors of light that when mixed together in equal intensities produce white light.
What is Complementary Colors.
500
6.when the bell is pressed the circuit is complete and current flows through the electromagnet. 2. the iron spring attached to the hammer is attracted to the electromagnet and the hammer hits the gong. 4. the circuit becomes broken at X, the current stops flowing and the electromagnet is switched off. 5. the spring with the attached hammer moves back to make contact at X 3. the electric circuit is closed and the current flows again. 1. the bell keeps ringing until the switch is opened.
What is 1.when the bell is pressed the circuit is complete and current flows through the electromagnet. 2. the iron spring attached to the hammer is attracted to the electromagnet and the hammer hits the gong. 3. the circuit becomes broken at X, the current stops flowing and the electromagnet is switched off. 4. the spring with the attached hammer moves back to make contact at X 5. the electric circuit is closed and the current flows again. 6. the bell keeps ringing until the switch is opened.
500
True or False: The sun should always be looked at directly because blindness may result.
What is False. The sun should never be looked at directly because blindness may result.
500
Any two colors of light that when mixed together in equal intensities produce white light.
What is Complementary Colours
500
Draw and label on the board the parts of the filament bulb.
What is asa
500
A red filter absorbs all colors except.....
What is red
M
e
n
u