1 What is the first step to be taken if concentrated hydrochloric acid spills on the laboratory floor? flag bookmark A Inform the teacher B Call the Fire Department C Ask friends to go out of the laboratory D Sprinkle sand onto the spillage area T4 Chapter 1.2 Disposal of Waste Inform the teacher immediately, as concentrated acid spills require proper safety handling and must not be dealt with by students.
2 Why are the skin and lips of a choking victim bluish and blackish? flag bookmark A The victim's airway is blocked by a foreign object B The victim inhales more carbon dioxide gas C Less oxygen in the blood D The victim has difficulty in breathing T4 Chapter 2.2 Heimlich Manoeuvre Bluish skin and lips indicate cyanosis, caused by reduced oxygen in the blood. Although choking involves an airway blockage, the discolouration itself results from low blood oxygen levels.
3 Diagram 1 shows a type of thermometer. What is the type of the thermometer? flag bookmark A Clinical thermometer B Rectal thermometer C Laboratory thermometer D Infrared thermometer T4 Chapter 3.1 Body Temperature It uses a digital display and measures temperature from infrared radiation emitted by the body without contact.
4 Diagram 2 shows the blood pressure reading of a man. What disease might be suffered by the man? flag bookmark A Anaemia B Diabetes mellitus C High blood pressure D Low blood pressure T4 Chapter 3.3 Blood Pressure The reading of 86/60 mmHg is below the normal 120/80 mmHg, indicating abnormally low blood pressure.
5 Which of the following is a socioscientific issue in the energy sector? flag bookmark A Decomposition of solid waste B Forest burning C Depletion of fossil fuels D Release of motor vehicle fumes T4 Chapter 4.2 Energy Sector Depletion of fossil fuels is a socioscientific issue because it links scientific limits of energy resources with societal concerns over sustainability and future energy supply.
6 Study the following statement. > About 268 million tons of paper are produced per year. > Paper is the main contributor to solid waste. What can be done to overcome the issue? flag bookmark A Using paper as fuel B Using paper only when needed C Planting more trees to produce paper D Keeping all unused paper in the store T4 Chapter 4.3 Waste and Wastewater Management Sector Using paper only when needed reduces the amount of paper produced and discarded, directly tackling the main contributor to solid waste. The other options still generate or preserve waste.
7 Study the following statement. > Forests are the 'lungs of the Earth' Which of the following affects the role of forests as stated above? flag bookmark A Use of fossil fuel resources for motor vehicles B Water pollution due to chemical dumping C Excessive use of chemical fertilisers in agriculture D Widespread forest exploration T4 Chapter 4.4 Agriculture and Forestry Sector Forests act as lungs by absorbing carbon dioxide and releasing oxygen. Widespread forest exploration removes trees, directly reducing this function.
8 What is the importance of cell division to living organisms? flag bookmark A Produce more antibodies B Help absorb nutrients in the intestine C Help tissue growth and repair D Produce energy in the growth process T4 Chapter 5.1 Cell Division Cell division enables organisms to grow by increasing cell number and replaces damaged or worn-out tissues, which is essential for growth and repair.
9 Diagram 3 shows the inheritance scheme diagram of a cross between two pea plants. What are the genotypes of the offspring of the cross? flag bookmark A Tt, tt, tt and tt B Tt, Tt, tt and tt C Tt, Tt, Tt and tt D Tt, Tt, Tt and Tt T4 Chapter 5.2 Inheritance All offspring inherit one T from the tall parent and one t from the dwarf parent, so every offspring is Tt.
10 Diagram 4 shows the karyotype of an individual. Which of the following is a characteristic of the individual? flag bookmark A Sterile B Small testis C Physical and mental retardation D No development of secondary sexual characteristics T4 Chapter 5.3 Mutation Pair 21 has three chromosomes, indicating Trisomy 21 (Down syndrome), which causes physical and mental retardation.