JAMB Physics 2010
Questions & Answers

A student could mistakenly pick option A, assuming velocity stays constant when no forces act on the object. In the absence of air resistance, a falling body experiences a constant acceleration due to gravity (g ≈ 9.8 m/s²), which represents uniform acceleration. Common mistake: Confusing constant speed with constant acceleration under gravity.

One might be tempted to choose option A or C, thinking of Earth's internal heat or nuclear reactions, but these are minor contributors to atmospheric dynamics. Solar radiation drives Earth's climate system by providing energy that influences weather patterns and temperature. Common mistake: Attributing surface climate control to internal planetary heat sources instead of external solar input.

A student might mistakenly choose speed, failing to distinguish between scalar and vector quantities. Unlike speed, distance, and time, which are scalars, velocity is a vector quantity with both magnitude and direction. Common mistake: Forgetting that velocity requires a directional component.

A test-taker could mistakenly guess option A, incorrectly assuming direct proportionality between pressure and volume. According to Boyle's law, at constant temperature, pressure is inversely proportional to volume (P₁V₁ = P₂V₂), so doubling volume halves pressure. Common mistake: Confusing inverse proportionality with direct proportionality in gas laws.

A student might select rubber or plastic, confusing conductive properties with insulating materials commonly used for safety handles. Copper is an excellent conductor due to its low electrical resistance and high conductivity, unlike insulators like rubber, glass, and plastic. Common mistake: Selecting electrical insulators instead of conductors.

Option D might seem plausible if one misremembers wave velocities through various mediums, but wave speed depends on the medium rather than the oscillation type. Transverse waves (e.g., light) oscillate perpendicular to their direction, while longitudinal waves (e.g., sound) oscillate parallel to it. Common mistake: Confusing the particle oscillation direction of transverse and longitudinal waves.

A student might mistakenly think sound can travel through a vacuum, picturing outer space scenes from movies. Sound waves are mechanical, requiring a medium (e.g., air) to propagate, unlike electromagnetic waves. Common mistake: Assuming sound waves share the propagation traits of electromagnetic waves.

One might choose option B, confusing transformers with rectifiers or inverters that handle AC and DC conversion. Transformers adjust voltage in AC circuits by stepping it up or down based on the turns ratio of their coils. Common mistake: Confusing voltage transformation with current rectification.

A student might pick reflection or refraction, which occur with both particles and waves, making them less exclusive proof of wave behavior. Diffraction, the bending of light around obstacles, clearly shows light's wave nature. Common mistake: Citing general optical phenomena like reflection instead of interference or diffraction as proof of wave characteristics.

A student could mistakenly select option A or D, confusing current with potential difference or power. The ampere (A) measures electric current, the rate of flow of electric charge. Common mistake: Confusing the units for current, voltage, and power.

A student might mistakenly select option C or D because electromagnetic waves do possess those characteristics. However, electromagnetic waves (e.g., light) travel through a vacuum and do not require a medium. Common mistake: Failing to identify the statement that contradicts the properties of electromagnetic radiation.

One might mistakenly select option A out of habit, associating power plants with burning materials. Nuclear fission, splitting heavy nuclei, releases energy in nuclear power plants. Common mistake: Assuming all power plants rely on combustion processes.

A student might choose option A, confusing an object's resistance to change with an active tendency to speed up. Inertia, per Newton's first law, is an object's resistance to changes in its motion state. Common mistake: Confusing inertia with momentum or acceleration.

A test-taker might guess option A, assuming that higher pressure helps bubbles form more easily. Higher external pressure raises the boiling point, as more energy is needed for molecules to escape the liquid. Common mistake: Assuming increased pressure lowers the temperature required for a liquid to boil.

A student might mistakenly pick a motor, which performs the exact reverse function by taking electrical input to create physical movement. A generator uses electromagnetic induction to convert mechanical energy into electrical energy. Common mistake: Confusing the functions of electric motors and generators.

A student might choose a concave mirror, thinking of makeup mirrors that magnify images, which would be disastrous for driving safety. Convex mirrors provide a wide field of view and upright, diminished images, ideal for rearview mirrors. Common mistake: Choosing a magnifying mirror instead of one that expands the field of view.

A student might incorrectly choose Coal, Natural gas, or Petroleum because these are commonly discussed energy options, but unlike those finite fossil fuels, Wind is replenished naturally and counts as renewable.

One might mistakenly guess Earth's rotation or Solar radiation thinking they dominate global phenomena, but oceanic tides are specifically caused by the Moon's gravity pulling on Earth's oceans to create high and low tides.

A student might lean toward Thermometer or Hygrometer since those are common weather instruments, but atmospheric pressure is measured precisely by a Barometer using either mercury or aneroid mechanisms.

A test-taker could mistakenly select options about magnification or orientation because images often vary in size and flip, whereas the fundamental distinction is that real images form where light converges and can be projected, whereas virtual images appear where light diverges and cannot be projected.