1.1 A book rests on a table - NSC Physical Sciences - Question 1 - 2024 - Paper 1
Question 1
1.1 A book rests on a table. Which ONE of the following forces will form an action-reaction pair with the weight of the book?
A. Force of the Earth on the book
B.... show full transcript
Worked Solution & Example Answer:1.1 A book rests on a table - NSC Physical Sciences - Question 1 - 2024 - Paper 1
Step 1
A book rests on a table. Which ONE of the following forces will form an action-reaction pair with the weight of the book?
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Answer
The correct answer is C. Force of the book on the table. According to Newton's third law, for every action, there is an equal and opposite reaction.
Step 2
A person is standing on a bathroom scale in a moving lift. Which ONE of the following will be measured on the scale?
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Answer
The scale will measure the normal force, which can either increase or decrease depending on whether the lift is accelerating upwards or downwards.
Step 3
Which ONE of the following graphs CORRECTLY shows the momentum of the car for the time the car moved on the road?
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Answer
The correct graph is B. This shows a change in momentum consistent with a sudden acceleration.
Step 4
Which ONE of the following combinations in the table below CORRECTLY represents the kinetic energy and the total mechanical energy of the stone at the instant the stone has fallen through a distance of ¼ h?
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Answer
The correct answer is D. ¼ mgh for kinetic energy and mgh for total mechanical energy, as it includes both kinetic and potential energy.
Step 5
Which ONE of the following statements is CORRECT?
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Answer
The correct answer is A. The observed spectral lines from the moving star will show a lower frequency and a longer wavelength due to the Doppler effect.
Step 6
Which ONE of the ammeters in the circuit will have the LOWEST reading?
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Answer
The correct answer is A₄, as this ammeter measures the current through the greatest resistance path.
Step 7
Which ONE of the following combinations is CORRECT for a line absorption spectrum?
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Answer
The correct answer is A. Higher to lower energy state results in dark lines in the spectrum.
