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This page covers Questions and Worked Solutions for Physics 9702 Paper 12 March 2022, 9702/12.

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March 2022 Physics 9702 Specimen Paper 1 (pdf)

- A student creates a table to show reasonable estimates of some physical quantities.

Which row is not a reasonable estimate? - Which expression has the same SI base units as pressure?
- The speed v of a liquid leaving a tube depends on the change in pressure ‘P and the density ρ of the liquid. The speed is given by the equation
- Which row correctly describes the quantities momentum, power and temperature?
- A girl throws a ball vertically upwards. It takes a time of 3.20 s to return to her hand.

Assume air resistance is negligible.

What is the initial speed with which the ball is thrown? - A radio-controlled toy car travels along a straight line for a time of 15 s.

The variation with time t of the velocity v of the car is shown. - The acceleration of free fall on Pluto is 0.66 m s
^{–2}.

An object weighs 6.0 N on Earth.

What would this object weigh on Pluto? - A stationary firework explodes into three pieces moving in the same plane. The masses and the velocities of the three pieces immediately after the explosion are shown.
- An object is dropped at time t = 0 from a high building. Air resistance is significant.

Three graphs are plotted against time:

- the height of the object above the ground
- the speed of the object
- the magnitude of the resultant force on the object.

- An object hangs by means of two cords around two rods, as shown.

The object is held in equilibrium by the forces F1 and F2. The object weighs 10 N. There is negligible friction between the rods and cords.

Which row of the table gives an angle θ of 90°? - Which force is caused by a difference in hydrostatic pressure?
- A car of mass 1400 kg is travelling on a straight, horizontal road at a constant speed of 25 m s
^{–1}.

The useful output power from the car’s engine is 30 kW.

The car then travels up a slope at 2.0° to the horizontal, maintaining the same constant speed.

What is the useful output power of the car’s engine when travelling up the slope? - The diagram shows four forces applied to a circular object.

Which row describes the resultant force and resultant torque on the object? - A uniform horizontal footbridge is 12.0 m long and weighs 4000 N.

It rests on two supports X and Y, as shown.

A man of weight 600 N stands a distance of 4.0 m from support X.

What is the upward force on the footbridge from support X? - A metal block has a mass of 750 g. Magnesium makes up 60% of the mass and the remaining 40% is copper.

- A man climbs slowly at a steady speed to the top of a ladder.

What is the main energy transfer taking place for the man as he climbs? - A bead is released from rest at point P and slides along a wire, as shown.

The wire loops around and forms a vertical circle of diameter 40 cm. At point Q, the bead has a speed of 1.4 m s^{–1}.

Air resistance and friction on the wire are negligible.

What is the height h from which the bead is released? - A mass is raised vertically. In time t, the increase in its gravitational potential energy is Ep and the
increase in its kinetic energy is Ek.

What is the average power input to the mass? - Water flows from a lake into a turbine that is a vertical distance of 90 m below the lake, as shown.
- A wire of diameter d and length l hangs vertically from a fixed point. The wire is extended by
hanging a mass M on its end. The Young modulus of the wire is E. The acceleration of free fall
is g.

Which equation is used to determine the extension x of the wire? - A wave has period T, wavelength λ and amplitude A. The wave is shown on a graph of
displacement x against distance d.

Which graph is correctly labelled? - A vehicle emits sound of a constant frequency. A stationary observer hears the sound.

The vehicle moves directly towards the observer at constant speed. The observer hears sound of frequency fo.

The vehicle then accelerates, still moving towards the observer, travels at a higher steady speed for a time and then decelerates until it stops.

What is the variation in the frequency of the sound that is heard by the observer? - A car travelling in a straight line at a speed of 30 m s
^{–1}passes near a stationary observer while sounding its horn. The frequency of sound emitted by the horn is 400 Hz.

The speed of sound in air is 336 m s^{–1}.

What is the change in the frequency of the sound heard by the observer as the car passes? - Which list shows electromagnetic waves in order of increasing frequency?
- The diagram shows a steel wire fixed at one end. The other end is attached to a weight hanging
over a pulley.

An oscillator is attached to the wire near the fixed end. A stationary wave with one loop is produced.

The frequency of the oscillator is f.

Which frequency of the oscillator produces a stationary wave with two loops? - Which statement gives a condition that enables diffraction to occur?
- A parallel beam of light of wavelength 600 nm is incident normally on a diffraction grating. The
grating has 300 lines per millimetre.

What is the total number of intensity maxima from the grating? - A pattern of interference fringes is produced using a red laser, a double slit and a screen. The screen is 3.5 m from the double slit. The light from the laser has a wavelength of 640 nm
- The diagram shows the symbol for a wire carrying a current I.
- An electric current I is given by the formula I = Anvq.

What do each of the symbols represent for an electric current in a metal wire? - Which values of current and resistance will produce a rate of energy transfer of 16 J s
^{–1}? - A coil contains N turns of insulated copper wire wound on to a cylinder of diameter D. The copper
wire has diameter d. The resistivity of copper is ρ. Diameter D is much greater than diameter d.

What is the total resistance between the two ends of the coil of copper wire? - Two cells are connected to a load resistor of resistance 3.0 :. The electromotive force (e.m.f.) and
the internal resistance of each of the cells are shown

What is the current in the load resistor? - The diagram shows a simple circuit
- Six resistors, each of resistance R, are connected as shown.
- A cell has a constant electromotive force and a constant internal resistance.

A thermistor is connected between the terminals of the cell.

The temperature of the thermistor is increased.

Which statement about the change of the cell’s terminal potential difference (p.d.) is correct? - A battery with negligible internal resistance is connected in series with a resistor and a lightdependent resistor (LDR) as shown.
- A radioactive nucleus is formed by β– decay. This nucleus then decays by D-emission
- What are the structures of the proton and of the neutron in terms of quarks?
- What is the charge of a top antiquark?

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