1 There was a small fire involving methane gas. What type of fire extinguisher can be used to put out the fire? flag bookmark A Water B Foam C Soap water D Dry powder T4 Chapter 1.3 Fire Extinguishers Methane is a flammable gas, so this is a Class C (gas) fire. Water, foam and soap water are not suitable for gas fires. A dry powder extinguisher smothers the flame, so D is correct.
2 Diagram 1 shows an individual who is giving emergency help. Which of the following is the correct procedure? flag bookmark A Heimlich Manoeuvre B Deep breathing technique C Clenched fist and bent technique D Cardiopulmonary resuscitation (CPR) T4 Chapter 2.2 Heimlich Manoeuvre The helper stands behind the person, wraps his arms around the waist and makes a fist below the ribs. This is the Heimlich Manoeuvre, used to push out food that is choking someone.
3 What is the effect of excess body mass? flag bookmark A Anorexia nervosa B Osteoporosis C Diabetes mellitus D Anaemia T4 Chapter 3.4 Body Mass Index (BMI) Carrying too much body mass makes it harder for the body to control blood sugar, so it raises the risk of diabetes mellitus. Anorexia nervosa and anaemia are linked to too little food, not too much.
4 The following information shows socio-scientific issues in a sector of Green Technology. - Acid rain - Emission of greenhouse gases - Use of petroleum What is the sector related to the issues above? flag bookmark A Transportation sector B Agriculture and forestry sector C Industrial and manufacturing sector D Waste and wastewater management sector T4 Chapter 4.5 Transportation Sector Burning petroleum in cars, buses and lorries releases greenhouse gases and the gases that cause acid rain. All three issues point to the transportation sector.
5 The government is now encouraging the application of Green Technology in daily life. Which of the following is the effect of the application of Green Technology on the carbon footprint? flag bookmark A Carbon footprint increases B Carbon footprint decreases C Carbon footprint changes D Carbon footprint does not change T5 Chapter 3.1a Carbon Footprint Green Technology uses less energy and releases less greenhouse gas. Less greenhouse gas means a smaller carbon footprint, so the carbon footprint decreases.
6 Diagram 2 shows a process during cell division. What is process X? flag bookmark A Chromosomal replication B Cytokinesis C Homologous chromosomes D Crossing over T4 Chapter 5.1 Cell Division Process X happens where two homologous chromosomes touch and swap pieces, so each chromosome ends up with part of the other's colour. This swapping is called crossing over.
7 Diagram 3 shows the inheritance of fur colour in cats. The dominant gene produces black fur while the recessive gene produces white fur. What is the percentage of having offspring with white fur? flag bookmark A 50 % B 100 % C 25 % D 75 % T4 Chapter 5.2 Inheritance Male Bb × female bb gives offspring Bb, Bb, bb, bb. Two out of four are bb, which has white fur. 2/4 = 50 %.
8 Diagram 4 shows two types of graph of variation. Which of the following is correct? *(Graph A | Graph B)* flag bookmark A Qualitative | Quantitative B Insignificant differences | Significant differences C Graph is discrete | Graph is normal D Can be inherited | Cannot be inherited T4 Chapter 5.5 Variation Graph A is a smooth bell shape, so it shows continuous variation where the differences between individuals are small (insignificant). Graph B has separate bars, so it shows discontinuous variation with clear (significant) differences.
9 Diagram 5 shows two types of animals that have the same support system. Which of the following statements is true? flag bookmark A Hydrostatic skeleton assists the movement of the animal B Endoskeleton protects the internal organs C Hydrostatic skeleton uses fluid inside the body to support the body weight D Exoskeleton consists of chitin to protect the internal organs T4 Chapter 6.1 Support, Movement and Growth in Animals The prawn and the crab are both arthropods. They have an exoskeleton, a hard outer layer made of chitin that protects their internal organs.
10 Diagram 6 shows the growth curves of males and females. At the age of 13, which of the following statements is true? flag bookmark A The height of males has not changed B Females are the same height as males C Females are taller than males D Males are taller than females T4 Chapter 6.2 Human Movement and Growth At 13 years old the dotted line (female) is above the solid line (male) on the graph. This means females are taller than males at that age.