Question 71
When light passes from air into water, what happens to its speed?Waves and opticsRefraction of lightmedium
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NSC Physical Sciences – South Africa
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Question 72
Which of the following is a chemical change?Chemical changeChemical reactionsmedium
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Question 73
What type of organic compound is represented by the general formula CnH2n+2?Organic chemistryHydrocarbonsmedium
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Question 74
A wave has a frequency of 50 Hz and a wavelength of 2 m. What is its speed?Waves and opticsWave speed calculationmedium
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Question 75
What is the magnetic effect of an electric current?Electricity and magnetismMagnetism and electromagnetismeasy
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Question 76
Which of the following best describes the principle of conservation of momentum?MechanicsMomentum and collisionshard
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Question 77
Which property of metals allows them to be drawn into wires?Matter and materialsProperties of metalsmedium
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Question 78
What is the acceleration of an object in free fall near the Earth's surface (neglecting air resistance)?MechanicsMechanics - Kinematics and dynamicseasy
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Question 79
Which component in an electric circuit restricts the flow of current?Electricity and magnetismElectric circuits and componentseasy
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Question 80
What type of chemical reaction is represented by 2H₂ + O₂ → 2H₂O?Chemical changeTypes of chemical reactionsmedium
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