امتحان

What is the metal used in light bulb?

1

Iron

2

Lead

3

Silver

تصحيح

Each lip in the lamp contain -------

1

Two filament of tungsten

2

Three filament of tungsten

3

One filament of tungsten

تصحيح

Wires in light bulb made fr om------

1

Copper

2

Lead

3

All the both

تصحيح

what is the type of the gas used in the light bulbs

1

hydrogen gas

2

nitrogen gas

3

piece of iron

تصحيح

What is the property of electric lamps?

1

Have special odo r

2

Associated with vapo r

3

Free fr om smoke

تصحيح

What is the main source of the light now?

1

Electricity

2

The sun

3

Ca ndles

تصحيح

What is the most popular source of artificial light?

1

Light bulbs

2

Fluo r escent lamps

3

Both a & b

تصحيح

Light bulbs used in all of this things except----------

1

Commercial advertisements

2

Car light

3

To r ches

تصحيح

What is the tool which convert the electric energy

1

Oil lamps

2

Ca ndles

3

Electric lamps

تصحيح

---------is the coiled wire that is made of tungsten

1

The base of the light bulb

2

The filament

3

The glass bulb

تصحيح

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