# 2021 Physics 9702 Paper 12

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This page covers Questions and Worked Solutions for Physics 9702 Paper 12 March 2021, 9702/12.

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March 2021 Physics 9702 Paper 12 (pdf)

1. What is a reasonable estimate for the density of sand?
2. Which physical quantity could have units of Ns2m-1?
3. A velocity vector is shown
What are the components of the velocity vector in the northerly and in the easterly directions?
4. A micrometer screw gauge is used to measure the diameter of a copper wire. The reading with the wire in position is shown in diagram 1. The wire is removed and the jaws of the micrometer are closed. The new reading is shown in diagram 2
5. A student measures the current and the potential difference for a resistor in a circuit
6. Four cars, A, B, C and D, move from rest in a straight line. The cars take the same time to accelerate to a velocity of 60 km h–1. Their velocity–time graphs are shown.
7. A cannon fires a cannonball with an initial speed v at an angle α to the horizontal.
8. A ball strikes a horizontal surface with momentum p at an angle θ to the surface, as shown.
9. A skydiver, who is falling vertically through the air, opens his parachute. Which row describes the velocity of the skydiver immediately after he opens his parachute?
10. A stationary firework explodes into four fragments which travel in different directions in a horizontal plane. The diagram shows the velocity and mass of each fragment.
11. A particle with mass moves in a horizontal straight line through a uniform electric field in a vacuum. The electric field is vertical.
12. Two parallel forces, each of magnitude F, act on a rod of length 5d. Which diagram shows the positions of the two forces that will produce the largest torque on the rod?
13. A mass of 30 kg is suspended from the end of a wire. A horizontal force F acts on the mass so that it is in equilibrium, with the wire at an angle of 30° to the vertical, as shown
14. A balance is used to measure the mass m of a number of cylindrical metal rods of length l. All the metal rods have the same radius r. The graph shows the variation with l of m
15. Two blocks, X and Y, are on a horizontal frictionless surface. The mass of block Y is greater than that of block X. Block Y has a spring attached to its end. The blocks are pushed together so that the spring is compressed between them and the blocks are held stationary as shown.

1. A gas is contained in a cylinder by a movable piston.
2. An egg of mass 25g falls vertically downwards from the surface of a table which is 900mm above the ground. Air resistance is negligible.
3. An aircraft travels at a constant velocity of 90m s–1 in horizontal flight. The diagram shows the horizontal forces acting on the aircraft.
4. Which expression is equal to the stress on a wire?
5. A wire is stretched by applying increasing values of force F. For each value of force applied, the extension x is recorded. A force–extension graph is plotted from the data obtained.
6. A progressive radio wave in a vacuum has a frequency of 75 MHz. What is the phase difference between two points on the wave that are 50 cm apart from each other?
7. Which statement is correct for longitudinal waves but not correct for transverse waves?
8. A loudspeaker emitting a sound wave of a single frequency is placed a distance L from a reflecting surface, as shown.
9. A source of sound of frequency F at point Z is moving at a steady speed. The pattern of the emitted wavefronts is shown.
10. What is not a possible value for the wavelength of the named electromagnetic waves when it is travelling in a vacuum?
11. Two waves, P and Q, meet at a point X and superpose. Initially, the two waves meet at X in phase (zero phase difference) so that the resultant wave has an amplitude of 14.0 cm at that point.
12. A water wave is diffracted as it passes through a gap between two barriers in a ripple tank. The wave is observed to ‘spread out’ as it moves through the gap. Which two factors both affect the amount of diffraction observed?
13. Two sources of microwaves P and Q produce coherent waves with a phase difference of 180°. The waves have the same wavelength λ.
14. A beam of red laser light of wavelength 633 nm is incident normally on a diffraction grating with 600 lines per mm.
15. Which diagram best represents the field lines in the electric field produced by a combination of one point positive charge and one point negative charge?
16. The diagram shows a thundercloud whose base is 500 m above the ground.
17. The current I in a metal wire is given by the equation
18. A cell of negligible internal resistance is connected to resistors R1, R2 and R3, as shown. The cell provides power to the circuit and power is dissipated in the resistors.
19. A fixed resistor and a diode are connected in series to a battery of electromotive force (e.m.f.) 6.0V and negligible internal resistance. The graph shows the variation with potential difference (p.d.) V of the current I for the diode.
20. An electrical cable consists of seven strands of copper wire, each of diameter 0.30 mm, connected in parallel.
21. A cell that has internal resistance is connected to a switch S and a variable resistor. A voltmeter is connected between the terminals of the cell, as shown.
22. A cell of electromotive force (e.m.f.) E and negligible internal resistance is connected into a circuit, as shown.
23. A battery is connected to a potentiometer. The potentiometer consists of a uniform resistance wire and a sliding contact P.
24. The figure shows part of a chart of nuclides where neutron number is plotted against proton number. An unstable nuclide X decays by emitting an α-particle. Which nuclide is formed by the decay of nuclide X?
25. The nuclei of common isotopes of hydrogen, helium, lithium and beryllium are shown. Which nucleus contains equal numbers of up and down quarks?

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