1. What is technology?

2. State two differences between science and technology.

Draw potassium atom and show the distribution of electrons in its shells.

[K= 19]

What energy transformations take place in each of the following activities?

1. Using a flashlight battery to produce light in a bulb.

2. Using a microphone to address a gathering.

List three components of soil.

1. Mention the junctions of a transistor.

2. Draw the circuit symbol for n-p-n transistor.

State one function of the following parts of the human circulatory system:

1. Blood;

2. Blood vessels;

3. Heart.

Classify each of the following substances as element, compound, or mixture:

1. Air;

2. Brass;

3. Chlorine;

4. Gold;

5. Water.

State three ways of caring for farm machines.

1. State two physical properties of water.

2. Using litmus paper, explain why water is neutral.

Give one function of each of the following nutrients in plants:

1. Nitrogen;

2. Potassium.

State two human activities that disrupt the carbon cycle.

1. State two effects of the disruption of the carbon cycle on the environment.

1. What is the density of a body?

2. A body of mass 50kg has a density of 2kg/m³. Calculate the volume of the body.

What is a vegetable crop?

1. What is air pollution?

2. State two human activities that lead to air pollution.

1. List three modes of heat transfer.

2. Name the type of medium in which each mode of heat transfer you have listed in (i) takes place.

Give three reasons why proteins are important in the diet of mammals.

1. State one function of the following parts of the human reproductive system:

   1. Penis;

   2. Ovary;

   3. Oviduct;

   4. Testis;

   5. Uterus;

1. What is an electrical conductor?

2. List two substances which are insulators.

State three ways of maintaining soil fertility.

1. Write the word equation for each of the following chemical reactions:

   1. Oxygen and hydrogen;

   2. Nitrogen and hydrogen;

   3. Sodium and chlorine.