OCR A A Level Physics Hard Questions
Physics
These are physics questions that I made mistakes in during my A-Levels. I have provided answers at the back of the flashcard. These are questions that align with the OCR A A Level Physics Spec.
Sample Data
| Front | A diver at the bottom of a lake of depth d fills a syringe with an ideal gas and seals the nozzle. The piston remains free to move. The volume of the gas in the syringe at the bottom of the lake is 90 cm3. As the diver returns to the surface, the temperature of the gas does not change. At the surface of the lake the gas in the syringe is at atmospheric pressure and the volume of the gas is 720 cm3. What is the volume of the gas in the syringe at a depth \(\frac{d}{2}\)? |
| Back | Remember that the atmospheric pressure adds on to the water pressure\((\rho g \frac{d}{2} + P_{atm})V_{\frac{d}{2}} = 90(\rho g d + P_{atm})\) -> EQ 1From PV = constant for top and bottom \(P_d = 8 P_{atm}\)So \(\rho g d = 7P_{atm}\) so \(\rho g \frac{d}{2} = (\frac{7}{2})P_{atm}\)So EQ 1 turns into \(\frac{9}{2}P_{atm}V_{\frac{d}{2}} = 8P_{atm} \times 90\)So \(V_{\frac{d}{2}} = 160 cm^3\) |
| Front |
 Just focus on the stuff to do with investigation 1(ignore investigation 2). The wave is vertically plane polarised(oscillations of electric field are in transmitter aerial direction). |
| Back | • receiver aerial vertical – electrons are driven (maximum distance) up and down along the length of the aerial because the oscillations (of the electric field) are vertical, causing maximum (a.c.) current • receiver aerial horizontal – electrons are driven (minimum distance) across the aerial because the oscillations (of the electric field) are only in the vertical plane (no oscillation along the aerial to cause current), so zero / minimum current • rotation of receiver aerial by ± 90o (or 90o and 270o) from vertical leads to zero currentWhen the receiver aerial is horizontal the electrons are moving perpendicular to the aerial so there is no current |
| Front |
 |
| Back | Answer is A, firstly you are not given R so you can't do anything to do with proportionality(DON'T ASSUME ANYTHING)The question mentions that they are the same material and resistivity is unique to material |