Match the applications of parts of the electromagnetic spectrum (i)-(v) in List A with the corresponding parts of electromagnetic spectrum in List B. Write the letter of the correct answer beside the item number in the answer booklet provided. List A (i) Can be used to sterilize fruits and vegetables. (ii) Stimulates the production of vitamin D in the human skin. (iii) Stimulates the sensitive cells in the retina. (iv) Emitted by a remote control. (v) Used for rapid cooking in an oven. List B A X-rays B Microwaves C. Ultra-violet rays D Alpha particles E Gamma rays F Infra-red rays G Radio waves H Visible light

1. Can be used to sterilize fruits and vegetables. (1 alama)
2. Stimulates the production of vitamin D in the human skin. (1 alama)
3. Stimulates the sensitive cells in the retina. (1 alama)
4. Emitted by a remote control. (1 alama)
5. Used for rapid cooking in an oven. (1 alama)

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Which set best represents fundamental quantities with their SI units?

Which one of the following conditions must be satisfied for a body to float?

The unit of pressure is:

Which of the following is an example of a renewable energy source?

The process by which a solid changes directly into a gas is called:

Which of the following statements about atoms is correct?

A concave mirror is used to form an image of a pin. (a) By using a well labelled diagram; show how you can obtain an upright and enlarged image. (b) With the aid of diagrams, describe three ways in which a human eye can be compared to a photographic camera.

1. A concave mirror is used to form an image of a pin. By using a well labelled diagram; show how you can obtain an upright and enlarged image. (4 alama)
2. With the aid of diagrams, describe three ways in which a human eye can be compared to a photographic camera. (6 alama)

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Carefully study the Figure 2 and then answer the question that follows: [Figure 2 shows a tube containing nitrogen gas and mercury, with atmospheric pressure indicated] (a) Find the pressure of the nitrogen gas in Pascal's unit. (Assume atmospheric pressure is 1.01 x 10^5 Pa and density of mercury is 13.6 g/cm^3). (b) State and explain any two sources of error in this experiment. (c) Why can a ship not overturn when hit by a strong wave on one side?

1. Find the pressure of the nitrogen gas in Pascal's unit. (Assume atmospheric pressure is 1.01 x 10^5 Pa and density of mercury is 13.6 g/cm^3). (5 alama)
2. State and explain any two sources of error in this experiment. (4 alama)
3. Why can a ship not overturn when hit by a strong wave on one side? (4 alama)

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Figure 3 shows a car moving to a farm. Identify four pairs of action/reaction forces taking place and describe their effects. [Figure 3 shows a car, trailer, manure, and string] (b) A pulley system with efficiency of 75% is made up of four pulleys. Sketch a well labelled diagram of this machine and then determine the effort required to raise two bags of maize each weighing 100 kg.

1. Figure 3 shows a car moving to a farm. Identify four pairs of action/reaction forces taking place and describe their effects. (4 alama)
2. A pulley system with efficiency of 75% is made up of four pulleys. Sketch a well labelled diagram of this machine and then determine the effort required to raise two bags of maize each weighing 100 kg. (6 alama)

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Figure 4 shows a circuit diagram for controlling the temperature of a sitting room. Describe how the circuit controls the temperature when the switch is closed. [Figure 4 shows a circuit with a bimetallic strip, heater element, switch, and contacts]

1. Figure 4 shows a circuit diagram for controlling the temperature of a sitting room. Describe how the circuit controls the temperature when the switch is closed. (6 alama)

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