grade 6 unit 2 lesson 1 part 1

................ are from the artificial sources that are used before inventing

electric lamps.

• a.candeles

• b. Oil lamps

• c. Fluorescent lamps

• d. (a) and (b)

The electric lamps represent a constant source of light that is.......................

• a. clear

• b. bright.

• c. free from smoke and odor

• d.(a), (b) and (c).

The electric lamp converts the electric energy into........................energy

• a. kinetic

• b. light

• C. sound

• d. magnetic

All the following are from the components of the light bulb except .....................

• a. the filament.

• b. the glass bulb

• c. two points of connection.

• d. the base of the light bulb,

The filament of the light bulb is made of tungsten because it has.............................

• a. low density.

• b. low melting point.

• c. high melting point.

• d. no conductivity.

The filament of the light bulb is made of................................

• tungsten.

• copper.

• aluminium

• iron.

............................... AllOW the electric current to transfer from the lamp base to the filament.

• The tungsten filament

• The argon gas

• Copper and lead wires in the light lamp

• The base of the light bulb

All the following are from the components of the fluorescent lamp

except....................

• a.tungsten filaments.

• b. points of connection.

• C. two thick copper wires.

• d. glass tube.

Which of the following gases is found in the fluorescent lamp but not in the light bulb?...................................

• Neon

• Argon

• Mercury vapour.

• Water vapour.

The glass tube in the fluorescent lamps contains.............................

• neon gas

• argon gas

• argon gas and a little of mercury vapour

• hydrogen gas