the simple electric circuit consists of ..

the electric lamps are connected in the house in series

... is considered from the third class lever

the lever is a resistance force that rotates on a fixed point called fulcrum

the scientist who invented the light bulb is thomas edison

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

when the electric lamp connected in the house in parallel

the distance from fulcrum to effort force

the second class levers do not conserve effort

a coiled thin wire made of tungsten in light bulbs is ...

avoid operating more than one machine in the same socket due to avoid overloading on wires and occurring electric fire

pushing the injured person by non - conducting thing

the simple machines act as effort saving

doctors use tweezers in surgeries because they pick up small objects

In the lever, the fixed point (fulcrum) is symbolized by...............

...............is example of levers that used to increase force

..............is a very accurate lever.

Lever affected by 500 Newton force and arm length is 20 meter and

also affected by 1000 Newton resistance, and its arm length is 5 m , is

the lever at equilibrium?

The length of the force arm of a first class lever is 5 cm. and the

length of resistance arm is 15 cm. if the resistance has a value of 300

Newton, calculate the value of effort force.

The force and resistance are equal in levers if ............................

Second class lever, force = 200 Newton. Force arm = 5 cm,

calculate the resistance arm, When the resistance = 100 N.

The only type of levers, where the arm of force and the arm of resistance are

equal is the.....................

The type of levers which always saves effort

The type of levers which always doesn't conserve effort

Some types of electric lamps are.............and.................

The .................is the main source of light on the earth.

Complete the following statements:

1. The crowbar is considered a................................class lever

but the.............................. is a third class lever.

Give reasons for :

Levers are very important in our daily life.

Seesaw is considered as a first class lever.

Correct the underlined words:

Second class levers are the most popular type of levers in our daily life.

The law of levers states that.............

The values of effort and resistance in the lever depend on.........................

Choose the correct answer:

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

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

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

Give reasons for the following:

The filament of the light bulb is made of tungsten.

The swelling of the electric lamp contains an inert gas instead of air.

The opposite figure shows the connection of electric bulbs in......................

If one of the two electric bulbs is damaged,the lighting of the other........................

1. In this case, the simple circuit is................................ so the electric current passes through.

Write the Label 6

plants get mineral salts from the ……………………….

the plant makes its own food through ……………………… process.

plants absorb water by their ………………………

root hairs extend from cells of …………………… layer.

roots hairs have a big ……………….. that contains salt solution

………………………. System fixes the plant in the soil.

Stem extends and penetrates the soil to increase the absorption process.

the outermost layer of a plant root is the cortex.

Green plants absorb water and minerals salts from the soil through root hairs that present in roots.

Pith layer is the last layer that follows the xylem layer.

Which of the following statements is true about photosynthesis?

Photosynthesis is important to plants because it is how the organism makes food.

What are the xylem and the phloem of a plant are examples of?

Transpiration delivers water needed for photosynthesis to the cells.

The layer that follows the xylem layer is

The root hair extend from

Stomata are widely spread on

Root hair wall is

Plant loses water in form of water vapour in

Root hair absorbs most water by

The concentration of water inside the vacuole of the root hair is .............. the concentration of water in the soil

The external thin layer of the plant root is called

Root hair number is large so it ................ the surface area for absorption of water and salts from the soil

A ................ substance is secreted by the root hairs to help the root hairs to help the root in penetrating the soil particles