IGCSE Science - Combined (0653) — October–November 2023, Paper 33

Fig. 1.1 is a diagram of the human gas exchange system, with parts labelled A, B, C, D, E. State the letter in Fig. 1.1 that identifies: one of the bronchi; the trachea.

A student investigates the reactions of four metals with dilute hydrochloric acid, HCl. In the first experiment, the student adds a piece of each metal to separate test-tubes of…

Fig. 3.1 shows a truck carrying a load moving horizontally along a flat level road. The load has a mass of 2500 kg. Calculate the weight of the load. The gravitational force on…

Fig. 4.1 shows a food web for one ecosystem. The web links plants, caterpillar, shrew, songbird, bear and hawk. Identify the herbivore in Fig. 4.1.

Natural gas and petroleum are fossil fuels. Methane is the main constituent of natural gas. Complete the word equation for the complete combustion of methane. methane + → +

Fig. 6.1 shows a wind turbine used to generate electricity for the electrical system of a house. Complete the sentences to describe the energy transfers for the wind turbine. The…

Carbohydrates are part of a balanced diet for humans. Large carbohydrates are digested by enzymes in the alimentary canal. The graph in Fig. 7.1 shows the effect of pH on the…

Chlorine exists as diatomic molecules. State what is meant by the term molecule.

Fig. 9.1 shows a lighthouse used at night to warn ships of dangerous rocks in the water; it produces a parallel beam of visible light. A thin converging lens is used to form the…