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NSC Physical Sciences – South Africa

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Question 241

Which of the following is an example of an exothermic reaction?
Chemical changeChemical change - Energy changesmedium

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Question 242

Which organic compound contains a carboxyl functional group (-COOH)?
Organic chemistryOrganic chemistry - Functional groupsmedium

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Question 243

A resistor of 5 Ω is connected in series with a 10 Ω resistor across a 15 V battery. What is the current in the circuit?
Electricity and magnetismElectricity - Circuitsmedium

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Question 244

Which optical phenomenon explains the bending of light when it passes from air into water?
Waves and opticsOptics - Refractionmedium

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Question 245

In mechanics, which quantity is conserved in an isolated system when two objects collide elastically?
MechanicsMechanics - Collisionshard

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Question 246

What is the acceleration of an object if a net force of 10 N is applied to a mass of 2 kg?
MechanicsMechanics: Newton's Laws of Motioneasy

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Question 247

A sound wave travels through air with a frequency of 500 Hz and a wavelength of 0.68 m. What is the speed of the sound wave?
Waves and opticsWaves: wave properties and speedmedium

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Question 248

Which crystal structure is typical of metals like copper and aluminium?
Matter and materialsStructure of matter: crystal structuresmedium

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Question 249

During electrolysis of molten sodium chloride, which substance is produced at the cathode?
Chemical changeElectrolysis of molten saltsmedium

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Question 250

What type of bond is formed between carbon and hydrogen atoms in methane (CH₄)?
Organic chemistryBonding in organic moleculeseasy

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