August 2025 Daily Physics questions
Free AS and A2 Daily MCQs from PhysicsUK. Questions appear here after a 7-day delay so pupils can practise with the answer and explanation available.
A Level Physics
A turntable spins steadily at a fixed rate (constant revolutions per second). A small marker at radius r casts a shadow so that its horizontal position executes SHM of amplitude r. The marker is moved to radius 2r,...
Waves: refraction; refractive index; Snell’s law (graphical), Graph skills: gradient vs area; straight-line proportionality
A student investigates refraction using a rectangular glass block. They plot sin(i) on the vertical axis against sin(r) on the horizontal axis and obtain a straight line through the origin with gradient 1.50 when the...
A Level Physics
In a school lab, a sealed beta− source gives 800 counts in 2.0 minutes on a GM tube 10 cm away with a 2 mm aluminium sheet in front. Background is negligible. A second identical source is placed next to the first at...
A Level Physics
In a double‑slit experiment with monochromatic light, the central point O on the screen is initially the brightest spot when both identical slits are unobstructed. Step 1: a filter over one slit reduces the amplitude...
A Level Physics
Which statement must be true immediately after closing the switch when a 9.0 V ideal battery is connected through a 100 Ω resistor to two identical, initially uncharged 100 µF capacitors that are either in parallel or...
A Level Physics
Two monochromatic lamps shine normally onto the clean cathode of a photocell. The metal’s threshold wavelength is 500 nm. Each lamp delivers the same power to the same area: Lamp 1 is 400 nm, Lamp 2 is 600 nm. Which...
A Level Physics
A clean metal has a threshold frequency that lies between the frequencies of red and violet light. It is illuminated in two separate trials: Trial X uses low-intensity violet light; Trial Y uses high-intensity red...
A Level Physics
A DC supply of voltage V is connected to a resistor R in series with two identical, initially uncharged capacitors. You can connect the capacitors either in series with each other or in parallel with each other, but in...
A Level Physics
In a photoelectric experiment, a clean metal with threshold frequency f0 is illuminated either by Lamp X (single spectral line at 1.2 f0) or Lamp Y (single spectral line at 2.2 f0). A lens is used with Lamp X so that...
A Level Physics
In a photoelectric experiment on a clean metal, monochromatic light with frequency 1.5 f0 (f0 is the threshold frequency) produces a stopping potential and a steady photocurrent. At the same time, an electron...
A Level Physics
A clean metal photocathode in vacuum is illuminated first by a violet LED (Source 1), then by a green LED (Source 2). For this metal, both LEDs have frequencies above the threshold. The experimenter adjusts the...
A Level Physics
A chest radiograph is taken at 80 kVp with exposure settings that give good detector signal. For a second patient of the same composition but 3.0 cm thicker along the beam path, the radiographer wants the same detector...
A Level Physics
A 6.0 V cell with internal resistance 3.0 Ω supplies a potential divider made from two identical 3.0 Ω resistors R1 and R2 in series. A high-resistance voltmeter measures V_out across R2. A third 3.0 Ω resistor is now...
A Level Physics
Two identical capacitors, one initially at 6.0 V and the other uncharged, have their negative plates joined. At t = 0 their positive plates are linked through a resistor R. Which statement must be true?
A Level Physics
An LDR and a fixed resistor R are connected in series across a stable d.c. supply. The output voltage Vout is taken across the LDR. A student measures Vout with a digital voltmeter whose input resistance is high but...
A Level Physics
In medical ultrasound imaging, a coupling gel is applied between the transducer and the patient's skin. What is the primary purpose of this gel?
A Level Physics
A metal wire, P, has length L and diameter d. A second wire, Q, is made from the same material but has length 2L and diameter 2d. The same tensile force is applied to both wires, and both are observed to obey Hooke's...
A Level Physics
A proton and a deuteron are accelerated from rest through the same potential difference. They then both enter a region containing a uniform magnetic field, with their velocities perpendicular to the field direction. A...
A Level Physics
A mass is hung from a single vertical spring, causing it to extend and store an amount of elastic potential energy E. Two identical springs are then arranged in parallel and the same mass is hung from the combination....
A Level Physics
A proton moves at a constant velocity `v` through a region of space. The region contains a uniform electric field of strength `E` and a uniform magnetic field of strength `B`. The fields and the proton's velocity are...
A Level Physics
A double-slit interference pattern is produced on a screen using monochromatic light in a vacuum. The entire experiment is then repeated with the apparatus submerged in a transparent liquid with a refractive index of n...
A Level Physics
A flat rectangular coil with 50 turns rotates at a constant angular speed within a uniform magnetic field. This induces a sinusoidal e.m.f. across the coil with a peak value of V₀. This coil is then replaced by a...
A Level Physics
A Young's double-slit experiment is performed in a vacuum, producing an interference pattern with a fringe spacing of 4.0 mm. The entire apparatus is then submerged in a transparent liquid with a refractive index of...
A Level Physics
A satellite moves in a stable circular orbit of radius r around a planet. Its engines are fired briefly to move it into a new stable circular orbit of radius 2r. Which statement correctly describes the change in the...
A Level Physics
A filament lamp is powered by a variable DC supply. The light from this lamp illuminates a metal cathode in a photocell, causing a photoelectric current. The potential difference across the lamp is significantly...
A Level Physics
A capacitor of capacitance C is charged to a potential difference V₀. It is then fully discharged through a resistor of resistance R. The same capacitor is then charged again to V₀ and fully discharged through a...
A Level Physics
Electrons are accelerated from rest through a potential difference V and then diffracted by a thin graphite crystal, producing a pattern of concentric rings on a fluorescent screen. The accelerating potential...
A Level Physics
Nucleus X has a mass number of 200 and a total binding energy of 1600 MeV. Nucleus Y has a mass number of 50 and a total binding energy of 440 MeV. Which statement correctly compares the stability and the average mass...
A Level Physics
A uniform metal wire is connected to a power supply with a constant e.m.f. and negligible internal resistance. The wire dissipates power P. The wire is then disconnected and permanently stretched to twice its original...
A Level Physics
A satellite is in a stable circular orbit around a planet. A very small, constant resistive force due to the planet's upper atmosphere acts on the satellite, causing its orbital radius to gradually decrease. Which...
A Level Physics
A photoelectric effect experiment is set up with a photocell. Monochromatic light of a fixed frequency, f, and intensity is incident on the cathode. The frequency f is greater than the threshold frequency of the...
A Level Physics
A potential divider circuit consists of a fixed resistor R and an NTC thermistor T connected in series to a power supply with negligible internal resistance. A high-resistance voltmeter is connected in parallel with...