AS & A Level Physics - 9702 Paper 1 2019 Winter Zone 3

Which quantity with its unit is correct?

Which two units are not equivalent to each other?

The arrow represents a vector R.
Which diagram does not represent R as two perpendicular components?

What could reduce systematic errors?

The power loss $P$ in a resistor is calculated using the formula $P = \frac{V^2}{R}$.
The percentage uncertainty in the potential difference $V$ is 3% and the percentage uncertainty in the resistance $R$ is 2%.
What is the percentage uncertainty in $P$?

A lead sphere is released from rest at point X, a long way above the surface of a planet. The sphere falls in a vacuum. After a time of 4.0 s, it has fallen through a vertical distance of 3.0 m. Assume the acceleration of free fall is constant.

How far will the sphere have fallen from point X at a time of 20 s after its release?

A box rests on the Earth, as shown.

Newton’s third law describes how forces of the same type act in pairs. One of the forces of a pair is the weight $W$ of the box.

Which arrow represents the other force of this pair?

A snowflake is falling from the sky on a still day. Its weight acts vertically downwards and air resistance acts vertically upwards. As the snowflake falls, air resistance increases until it is equal to the weight and there is no resultant force acting on the snowflake.

When the forces become equal, which statement is correct? 

Two objects X and Y in an isolated system undergo a perfectly elastic collision. The velocities of the objects before and after the collision are shown.

What is the speed $v$ of Y after the collision? 

A solid sphere, which is less dense than water, is held completely immersed in water a few metres below the surface. The density of the water is uniform. The sphere is released. Immediately after release, the sphere rises. Which row correctly describes the changes in the upthrust on the sphere and the resultant force on the sphere?

The diagram shows two pairs X and Y of parallel forces.

Which statement is correct?

A heavy ball hanging from a cable is held in equilibrium by a chain, as shown.

Which vector diagram shows the three forces acting on the ball?

At sea level, atmospheric pressure is 100 kPa and the density of air is $1.3 \, \text{kg m}^{-3}$. Assume that the density of air decreases linearly with height above sea level.

What is an estimate of the total height of the atmosphere based on this information?

Trains supply coal to a power station. The table shows quantities describing the operation of the power station.

Which expression gives the efficiency of the power station? 

A piston in a gas supply pump has an area of 500 cm$^2$ and it moves a distance of 30 cm. The pump moves the gas against a fixed pressure of 4000 Pa.

How much work is done by the piston?

A steel ball is falling at constant speed in oil.

Which graph shows the variation with time of the gravitational potential energy $E_p$ and the kinetic energy $E_k$ of the ball?

The maximum useful output power of a car travelling on a horizontal road is $P$. The total resistive force acting on the car is $kv^2$,

where $v$ is the speed of the car and $k$ is a constant.

Which equation is correct when the car is travelling at maximum speed? 

Initially, four identical uniform blocks, each of mass $m$ and thickness $h$, are spread on a table.

The acceleration of free fall is $g$.

How much work is done on the blocks in stacking them on top of one another?

The stress–strain graph for a wire is shown.

What is the Young modulus of the material of the wire?

The diagram shows a force–extension graph for a rubber band as the band is extended and then the stretching force is decreased to zero.

What can be deduced from the graph?

Which statement about light waves and sound waves is not correct?

The graph represents a sound wave.

Which statement is correct? 

A cathode-ray oscilloscope (CRO) is used to display a wave of frequency 5.0 kHz. The display is shown.

What is the time-base setting of the CRO?

A siren emits sound of frequency 1000 Hz. The siren moves at 20 m s\(^{-1}\) towards an observer who is standing still. The speed of sound in the air is 330 m s\(^{-1}\).

Which expression would correctly give the frequency heard by the observer?

A source of sound of constant power $P$ is situated in an open space. The intensity $I$ of sound at distance $r$ from this source is given by

$$ I = \frac{P}{4\pi r^2} $$.

How does the amplitude $a$ of the vibrating air molecules vary with the distance $r$ from the source?

In an experiment to demonstrate a stationary wave, two microwave transmitters, emitting waves of wavelength 4 cm, are set facing each other, as shown.

A detector is moved along a straight line between the transmitters. It detects positions of maximum and minimum signal. The detector is a distance $d$ from the left-hand transmitter.

Assume that both transmitters are at antinodes of the stationary wave.

Which row gives a value of $d$ for a maximum and for a minimum?

The graph shows how the height of the water surface at a point in a harbour varies with time $t$ as waves pass the point.

What are $p$ and $q$? 

The diagram shows a sketch of a wave pattern over a short period of time.

Which description of this wave is correct?

The double-slit experiment demonstrates interference between two coherent sources of light waves. In the diagram, the curved lines represent wavefronts.

At which point does complete destructive interference (a minimum) occur?

Light of wavelength 567 nm is incident normally on a diffraction grating. The grating has 400 lines per mm. A number of diffraction maxima are observed on the far side of the grating.

What is the angle between the second-order maximum and the third-order maximum?

The diagram shows the electric field pattern between two opposite and unequal point charges P and Q.

 

Which statement about the charges is correct?

A uniform electric field is represented by five horizontal field lines. 

P and Q are two points in the field. The field causes a positively charged particle in a vacuum to move from P to Q.

Which statement must be correct?

A metal electrical conductor has a resistance of 5.6\,\text{k}\Omega. A potential difference (p.d.) of 9.0\,\text{V} is applied across its ends.
How many electrons pass a point in the conductor in one minute?

A battery of electromotive force (e.m.f.) 12V and negligible internal resistance is connected to three resistors, each of resistance 6.0Ω, as shown.

What is the power dissipated in resistor R?

A box containing two electrical components is connected into a circuit.

The variable resistor is adjusted and measurements are taken to determine the $I-V$ characteristic for the box, as shown.

Which arrangement of two electrical components in the box would create the best fit to the measured $I-V$ characteristic?

A cell of internal resistance 0.5\(\Omega\) is connected to a fixed resistor of resistance 10\(\Omega\).
The resistance of the resistor is changed to 20\(\Omega\).
Which statement is not correct?

Which row correctly describes Kirchhoff's laws?
[Table_1]

In the circuit shown, all the resistors are identical.



The reading $V_1$ is 8.0V and the reading $V_2$ is 1.0V.
What are the readings on the other voltmeters?

A radioactive nucleus emits an $\alpha$-particle or a $\beta^-$ particle, creating a product nucleus.
Which decay could create the product nucleus stated?
[Table_1]

Which statement is correct?