OCR B 21st Century Physics — Unit 1 Quiz
Eight medium-difficulty multiple-choice questions targeting core behaviours and concepts from OCR B 21st Century Physics Unit 1.
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Quiz Questions & Answers
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Question 1: What best describes the energy transfer when an object falls freely near Earth's surface?
Gravitational potential energy converts into kinetic energy (minus thermal losses)
Mass is converted directly into energy per E = mc squared
Kinetic energy converts into chemical energy
Thermal energy converts into electrical energy
Question 2: Which quantity is conserved in an isolated system when objects collide elastically?
Both total kinetic energy and total momentum are conserved
Only momentum is conserved; kinetic energy is lost
Only kinetic energy is conserved; momentum changes
Neither kinetic energy nor momentum is conserved
Question 3: How does increasing the amplitude of a transverse wave affect its energy?
Energy carried by the wave increases proportional to amplitude squared
Energy is independent of amplitude
Energy decreases as amplitude increases
Energy depends only on frequency, not amplitude
Question 4: Which measurement strategy reduces systematic error when determining gravitational field strength g with a pendulum?
Increase pendulum mass to change period drastically
Use multiple lengths and plot T squared versus length to extract g from the gradient
Measure one period at a single length only once
Ignore reaction time when starting the stopwatch
Question 5: When treating an object as a particle in mechanics problems, what key assumption is being made?
Air resistance is the dominant force
Internal structure and rotation are ignored; all mass concentrated at a point
The object is made of many interacting point charges
Quantum effects dominate the motion
Question 6: A student claims heavier objects fall faster than lighter ones in vacuum. How should this claim be evaluated?
Accept it because weight influences inertia strongly
Accept but only near planetary cores
Reject it: in vacuum acceleration due to gravity is independent of mass
It depends on chemical composition rather than mass
Question 7: Which model best explains how light intensity decreases with distance from a point source?
Intensity remains constant regardless of distance
Intensity increases with the square of distance
Inverse square law: intensity falls proportional to 1 over distance squared
Intensity drops linearly with distance
Question 8: Why is it important to identify assumptions when using a physics model to solve a problem?
Assumptions guarantee exact agreement with experiments
Assumptions define model validity and indicate limits where predictions may fail
Assumptions only matter for theoretical physics, not practical tasks
Assumptions are optional and don't affect results