Helium molecule consists of -------atom while hydrogen molecule consists of -----atom

(a)  

The -----------and -------------solutions are good conductors of electricity

(a)  

-------- is permanent resource of energy

(a)  

An alloy of --------------is used in making jewels

but an alloy of ----------- is used in heating coils.

(a)  

Solar heater changes ---------energy to ------------energy

(a)  

Give reasons for:

The atom is electrically neutral.

(a)  

Give reasons for:

Some birds have wide indented beaks

(a)  

Write the chemical symbol for each:

I. Potassium.

2. Iron.

3. Carbon.

4. Oxygen

(a)  

From the substances that float on water is

a. iron.

b. oil.

c. copper.

d. aluminum.

(a)  

From animals with soft bodies (a)  

a. snail.

b. jellyfish.

c. snake.

d. turtle

Heat transfers by conduction through

a, gases only.

b. liquids only.

c. solid only.

d. vacuum only.

(a)  

The attraction force between solids is ----

a. strong.

b. weak.

C.MEDIUM

d infinity

(a)  

Taste property distinguish between

a. milk and honey.

b. silver and gold.

c. wood and plastic.

d. iron and copper.

(a)  

Electric lamp changes the electric energy into--------

a. light

b- sound

c. chemical

d. magnetic

(a)  

Define:

1. Element.

2. Mechanical energy.

(a)  

Give one example for each:

1. Substance soft at room temperature.

2. Substance sink in water.

3. Very active metals.

4. Arthropods have 3 pairs of jointed legs.

(a)  

Write the scientific term:

1. Temperature at which matter begins to change from solid to liquid.

2. Invertebrates which have jointed legs..

3. Work done during the motion of an object.

4. Modification in organisms body structure or function of its organs to be adapted.

5. Atom that gains a quantum of energy.

6. The sum of protons and neutrons in nucleus.

(a)  

Write electronic configuration form each:

1. ⁷ Li ₃ 2. ²⁰Ne₁₀

Find the density of a piece of iron if its mass 78 gm and its volume 10 cm?

Put() or (x), then correct the wrong ones:

1. Cold air rises up and hot air falls down.

(a)  

2. Iron rusts when exposed to wet air.

(a)  

3. Webs of cellular phone cause water pollution.

(a)  

4. Animals can be classified according to body support.

5. Boiling point is the temperature which matter changes from liquid to gas

6. Heat transfers in space by radiation.

(a)  

Compare between solid and gas in regarding (intermolecular space, examples).

A ball launched upwards at a speed 3 m/s up to height 4 m find the kinetic and potential energies of the ball if its weight is 5 newton and has a mass 0.5 kg.