AS & A Level Physics - 9702 Paper 1 2014 Summer Zone 3

Which quantity can be measured in electronvolts (eV)?

The unit of specific heat capacity is $\text{J kg}^{-1} \text{K}^{-1}$.
What is its equivalent in terms of SI base units?

What is the vertical component of this displacement vector?

The resistance of a lamp is calculated from the value of the potential difference (p.d.) across it and the value of the current passing through it.
Which statement correctly describes how to combine the uncertainties in the p.d. and in the current?

The display on a cathode-ray oscilloscope shows the signal produced by an electronic circuit. The time-base is set at 5.0 ns per division and the Y-gain at 10 V per division. What is the frequency of the signal?

A digital caliper is used to measure the 28.50 mm width of a plastic ruler. The digital caliper reads to the nearest 0.01 mm.
What is the correct way to record this reading?

An experiment is performed to measure the acceleration of free fall $g$. A body falls between two fixed points. The four measurements shown below are taken.

Which measurement is not required for the calculation of $g$?

In a cathode-ray tube, an electron is accelerated uniformly in a straight line from a speed of $4 \times 10^{3} \: \text{ms}^{-1}$ to $2 \times 10^{7} \: \text{ms}^{-1}$ over a distance of 10 mm.

What is the acceleration of the electron?

The graph shows how the speed $v$ of a sprinter changes with time $t$ during a 100 m race.

What is the best estimate of the maximum acceleration of the sprinter? 

A tennis ball is dropped onto a table and bounces back up. The table exerts a force F on the ball.

Which graph best shows the variation with time t of the force F while the ball is in contact with the table?

A resultant force of 10 N acts on a body for a time of 2.0 s.

Which graph could show the variation with time $t$ of the momentum $p$ of the body?

A stationary body explodes into two components of masses $m$ and $2m$. The components gain kinetic energies $X$ and $Y$ respectively.

What is the value of the ratio $\frac{X}{Y}$? 

What is the condition for an object to be in equilibrium?

A uniform solid cuboid of concrete of dimensions 0.50 $m \times 1.20 m \times 0.40 m$ and weight 4000 N rests on a flat surface with the 1.20 m edge vertical as shown in diagram 1.

What is the minimum energy required to roll the cuboid through 90\degree to the position shown in diagram 2 with the 0.50 m edge vertical? 

A uniform beam is pivoted at P as shown. Weights of 10N and 20N are attached to its ends.

The length of the beam is marked at 0.1 m intervals. The weight of the beam is 100N.

At which point should a further weight of 20N be attached to achieve equilibrium?

An electric motor has an input power $P_{in}$, useful output power $P_{out}$ and efficiency $\eta$.

How much power is lost by the motor? 

A shot-put champion accelerates a 7.0 kg metal ball in a straight line. The ball moves from rest to a speed of 12 m s\(^{-1}\) in a distance of 1.2 m.

What is the average resultant force on the metal ball?

A ball drops onto a horizontal surface and bounces elastically.

What happens to the kinetic energy of the ball during the very short time that it is in contact with the surface?

When the water in a pond freezes, it changes from a liquid to a solid. When this occurs, it changes volume and exchanges energy with the surroundings.

Which row is correct?

Which process does $\textit{not}$ require energy to be supplied?

The graph shows the distribution of speeds for the molecules of a gas at a particular temperature.

Which statement is correct? 

The Mariana Trench in the Pacific Ocean has a depth of about 10 km. Assuming that sea water is incompressible and has a density of about 1020 kg m^-3, what would be the approximate pressure at that depth?

An elastic material with a Young modulus $E$ is subjected to a tensile stress $S$. Hooke's Law is obeyed. What is the expression for the elastic energy stored per unit volume of the material?

Cylindrical samples of steel, glass and rubber are each subjected to a gradually increasing tensile force $F$. The extensions $e$ are measured and graphs are plotted as shown below.

Which row correctly relates the graphs to the materials? 

A cathode-ray oscilloscope (c.r.o.) displays a waveform corresponding to a sound wave.

In order to determine the frequency of the sound wave, which part of the displayed waveform must be measured and which c.r.o. setting must be known? 

What is the approximate range of frequencies of infra-red radiation?

A small source emits spherical waves.

The wave intensity $I$ at any point $P$, a distance $r$ from the source, is inversely proportional to $r^2$.

What is the relationship between the wave amplitude $a$ and the distance $r$?

A student attempts to show the interference of light using two identical green LEDs. Which statement explains why the experiment will not succeed?

A stationary wave is set up on a stretched string, as shown.

Which statement about the points on the string is correct? 

Monochromatic light is incident on a diffraction grating and a diffraction pattern is observed.

Which line of the table gives the effect of replacing the grating with one that has more lines per metre?

An electron enters a region of space where there is a uniform electric field $E$ as shown. 

Initially, the electron is moving parallel to, and in the direction of, the electric field.

What is the subsequent path and change of speed of the electron? 

Two parallel plates X and Y are separated by a distance $d$ in a vacuum. There is a potential difference between the plates so that a uniform electric field is produced.

A charge $-q$ moves from rest from the surface of plate X and travels towards plate Y. When the charge reaches plate Y it has kinetic energy $K$. Which expression gives the electric field strength between the plates? 

Two wires P and Q made of the same material and of the same length are connected in parallel to the same voltage supply. Wire P has diameter 2 mm and wire Q has diameter 1 mm.
What is the ratio \[ \frac{\text{current in P}}{\text{current in Q}} \]?

A cell has an electromotive force (e.m.f.) of 6V and internal resistance \( R \). An external resistor, also of resistance \( R \), is connected across this cell, as shown.

Power \( P \) is dissipated by the external resistor.
The cell is replaced by a different cell that has an e.m.f. of 6V and negligible internal resistance.
What is the new power that is dissipated in the external resistor?

The diagram shows a low-voltage circuit for heating the water in a fish tank.
The heater has a resistance of 3.0Ω. The power supply has an e.m.f. of 12V and an internal resistance of 1.0Ω.
At which rate is energy supplied to the heater?

The diagrams show the same cell, ammeter, potentiometer and fixed resistor connected in different ways.

The distance $d$ between the sliding contact and a particular end of the potentiometer is varied. The current measured is then plotted against the distance $d$.
For which two circuits will the graphs be identical?

What is the current in the 40\(\Omega\) resistor of the circuit shown?

A battery of negligible internal resistance is connected to a resistor network, an ammeter and a switch S, as shown.

When S is open, the reading on the ammeter is 250 mA.
When S is closed, what is the change in the reading on the ammeter?

An isotope of thorium has a nucleon number of 232 and a proton number of 90. It decays to form another isotope of thorium with a nucleon number of 228.
How many alpha particles and beta particles are emitted by a nucleus of thorium during this decay?

Four nuclei are represented below:

$$\begin{array}{cccc} ^{28}_{14}\text{E} & ^{25}_{15}\text{G} & ^{25}_{12}\text{M} & ^{24}_{13}\text{Q} \end{array}$$
Which statement about these nuclei is correct?