grade 6 unit 2 lesson 1 part 2

When the electric lamp connected in parallel with others in the electric circuit

the light intensity ....................

,

• a. decreases.

• b. increases.

• c. doesn't change

• d. decreases sometimes and increases another times.

All the following gases are used in the electric lamps except ...................

• a. argon.

• b. atmospheric air.

• C. mercury vapour.

• d. (a) and (c).

We need a light bulb, battery and connecting wires connected together in a closed continuous path to...............................................

• a. obtain a continuous electri circuit,

• b. make a simple electric circuit,

• c. make the bulb lights up.

• d(a), (b)and (c).

When we connect more than One bulb in series to an electric source

the light intensity of the bulbs.............................

• a. decreases

• b. increases

• c. does not change.

• d. (a), (b) and(c).

when we connect more than one bulb in the parallel to an electric source the light intensity in the bulbs ..................................

• a. decreases

• b. increases

• c. does not change.

• (a), (b) ang(c).

If we have three light bulbs and we need to get high intensity, so we must connect them.........................................................

• a. in series.

• b. in parallel.

• c. (a) and (b).

• d. without Copper wires

When We unscrew a bulb from, those that are connected in series,..............................................

• the unscrewed lamp only will be turned off

• b. all lamps still lighting.

• C. no lamp will be turned off

• d. all lamps will be turned off.

When an electric lamp which is connected in series with the other lamps burns out, .....................

• a. the lignt intensity decreases,

• b. the light intensity increases,

• c. all lamps turn off

• d. no correct answer

put (true) or (false )

The light bulbs are the most popular source of natural light.

• True

• False

put (true) or (false )

Fluorescent lamp contains neon gas.

• True

• False