1 Which of the following substances would require assistance from the Fire and Rescue Department if spilled in a science laboratory? flag bookmark A Mercury B Greasy substance C Petrol and diesel D Concentrated hydrochloric acid T4 Chapter 1.2 Disposal of Waste Mercury is highly toxic and easily vaporises, so a spill needs specialised containment and cleanup by the Fire and Rescue Department rather than routine lab handling.
2 Which of the following is the function of a face mask? flag bookmark A Looks more professional B Takes care of cleanliness C Protects the nose and mouth from inhaling harsh chemicals D Protects the eyes from harmful chemical substances in the laboratory T4 Chapter 1.1 Personal Protective Equipment A face mask covers the nose and mouth, so it filters out harmful chemicals in the air and prevents them from being inhaled.
3 Diagram 1 shows Encik Mamat rescuing a child who is almost drowning in a swimming pool. What type of emergency help is needed by the child if she is unconscious after being rescued? flag bookmark A Heimlich manoeuvre B Cardiopulmonary resuscitation C Body temperature measurement D Blood pressure measurement T4 Chapter 2.1 Cardiopulmonary Resuscitation (CPR) An unconscious child after drowning requires CPR to restore breathing and circulation, as the heart and lungs may have stopped.
4 What is the main purpose of performing the Heimlich manoeuvre? flag bookmark A To increase the body temperature B To increase blood pressure C To increase blood circulation D To remove an object that is stuck in the airway T4 Chapter 2.2 Heimlich Manoeuvre The Heimlich manoeuvre applies sudden abdominal pressure to force air upward, which dislodges and expels an object stuck in the airway so the person can breathe again.
5 Areena has a body mass of 65 kg and a height of 1.60 m. Calculate Areena's BMI. $$\text{BMI} = \frac{\text{Body mass (kg)}}{(\text{Height})^2\ (\text{m}^2)}$$ flag bookmark A 19.5 kg m⁻² B 20.3 kg m⁻² C 25.4 kg m⁻² D 40.6 kg m⁻² T4 Chapter 3.4 Body Mass Index (BMI) 65 ÷ (1.60 × 1.60) = 65 ÷ 2.56 = 25.4, so the BMI is 25.4 kg m⁻².
6 The burning of fossil fuels in factories is one of the socioscientific issues in the energy sector. What is the application of Green Technology to solve this issue? flag bookmark A Using renewable energy sources B Stopping the operation of the factories immediately C Increasing the number of factories that remain in operation D Lowering factory chimneys in industrial areas T4 Chapter 4.2 Energy Sector Renewable energy replaces fossil fuels, cutting carbon emissions from factories. Stopping operations or lowering chimneys doesn't address energy generation, so using renewables directly solves the issue.
7 The following information highlights socioscientific issues in the waste and wastewater management sector. - Nearby ecosystems are disrupted - Environmental pollution - Issue X Which of the following is correct about issue X? flag bookmark A Soil erosion B Land pollution C Water pollution D Increased nitrogen gases in the atmosphere T4 Chapter 4.3 Waste and Wastewater Management Sector Waste and wastewater management directly affects water bodies, so the missing socioscientific issue is water pollution. It aligns with the sector’s impact on aquatic environments, unlike soil erosion or atmospheric nitrogen gases.
8 A tall eggplant plant, K, is cross-bred with another tall eggplant plant, L. ¾ of the first generation are tall while ¼ are short. If T represents the dominant gene and t represents the recessive gene, what are the genotypes of plants K and L? flag bookmark A K: TT, L: tt B K: TT, L: Tt C K: Tt, L: Tt D K: Tt, L: tt T4 Chapter 5.2 Inheritance A 3 : 1 ratio of tall to short offspring only arises when both parents are heterozygous. Both K and L are tall, so neither can be tt; therefore K and L are both Tt.
9 Which of the following statements is true? flag bookmark A Cartilage connects the ligaments with the ulna bone B Synovial fluid supplies nutrients to cartilage C Tendons connect muscles and skin D Muscle is made up of a combination of fibres T4 Chapter 6.2 Human Movement and Growth Cartilage has no blood supply, so synovial fluid delivers the nutrients and oxygen it needs. This is why B is true.
10 Diagram 2 shows information on the growth of an animal with an exoskeleton. - Air is sucked in to expand their bodies - Shedding of the old exoskeleton - Replaced with a bigger new exoskeleton What is the stage referred to by the characteristics above? flag bookmark A Ecdysis B Nymph C Hydrolysis D Breeding T4 Chapter 6.1 Support, Movement and Growth in Animals The process of shedding the old exoskeleton and expanding the body with air before forming a new, larger exoskeleton is known as ecdysis.