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NSC Physical Sciences – South Africa

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Question 191

Which of the following statements about magnetic fields is true?
Electricity and magnetismMagnetism - Magnetic fields and forcesmedium

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Question 192

What is the energy change when 1 mole of a substance melts at its melting point?
Matter and materialsPhase changes and energyhard

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Question 193

Which type of isomerism involves compounds with the same molecular formula but different connectivity of atoms?
Organic chemistryIsomerism in organic compoundshard

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Question 194

Which of the following materials has the highest electrical conductivity?
Electricity and magnetismElectricity - Conductors and Insulatorseasy

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Question 195

What type of wave is a sound wave?
Waves and opticsWaves - Types of waveseasy

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Question 196

What is the chemical formula of methane, the simplest hydrocarbon?
Organic chemistryOrganic Chemistry - Hydrocarbonseasy

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Question 197

A 50 Ω resistor is connected to a 12 V battery. What is the current flowing through the resistor?
Electricity and magnetismElectricity - Ohm's Lawmedium

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Question 198

What is the refractive index of a medium if the speed of light in vacuum is 3.0 × 10⁸ m/s and the speed of light in the medium is 2.0 × 10⁸ m/s?
Waves and opticsOptics - Refractionmedium

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Question 199

Which of the following represents a chemical change?
Chemical changeChemical Change - Types of changesmedium

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Question 200

What is the principle behind the operation of a transformer?
Electricity and magnetismElectricity - Transformers and inductionhard

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