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NSC Physical Sciences – South Africa

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Question 251

A copper wire has a resistance of 2 Ω at 20°C. If the temperature increases to 70°C, what happens to the resistance? (Copper's temperature coefficient of resistance is positive)
Electricity and magnetismElectrical properties of materialsmedium

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Question 252

Which of the following best explains why blue light refracts more than red light when passing through a prism?
Waves and opticsRefraction and dispersion of lighthard

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Question 253

In the combustion of propane (C₃H₈), what is the total number of oxygen atoms required to completely burn one molecule of propane?
Chemical changeStoichiometry of combustion reactionshard

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Question 254

Which functional group is characteristic of alcohols in organic chemistry?
Organic chemistryFunctional groups in organic compoundseasy

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Question 255

Which type of wave can travel through a vacuum?
Waves and opticsWaves - Wave typeseasy

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Question 256

Which of the following indicates a chemical change has occurred?
Chemical changeChemical reactions - Indicators of chemical changeeasy

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Question 257

In organic chemistry, which functional group characterizes an alcohol?
Organic chemistryFunctional groups in organic chemistrymedium

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Question 258

A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. What is the total resistance?
Electricity and magnetismElectric circuits - Resistance in seriesmedium

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Question 259

When a wave passes from air into water, what happens to its speed and wavelength?
Waves and opticsWave behavior - Refractionmedium

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Question 260

Which of the following best explains why ionic compounds generally have high melting points?
Matter and materialsBonding - Ionic bondinghard

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