AS & A Level Physics - 9702 Paper 1 2010 Winter Zone 2

Which row shows a base quantity with its correct SI unit?
[Table_1]

The frictional force $F$ on a sphere falling through a fluid is given by the formula $F = 6 \pi a \eta v$ where $a$ is the radius of the sphere, \( \eta \) is a constant relating to the fluid and $v$ is the velocity of the sphere.
What are the units of \( \eta \)?

What is the component of this displacement vector in the direction XY?

A metre rule is used to measure the length of a piece of wire. It is found to be 70 cm long to the nearest millimetre.

How should this result be recorded in a table of results?

A quantity $x$ is to be determined from the equation $x = P - Q$.

$P$ is measured as $1.27 \pm 0.02 \, \text{m}$.

$Q$ is measured as $0.83 \pm 0.01 \, \text{m}$.

What is the percentage uncertainty in $x$ to one significant figure?

A football is dropped from the top of a three-storey building. It falls through air until it reaches the ground.

What remains constant throughout the fall?

A student throws a ball in the positive direction vertically upwards.

The ball makes an elastic collision with the ceiling, rebounds and accelerates back to the student’s hand in a time of 1.2 s.

Which graph best represents the acceleration of the ball from the moment it leaves the hand to the instant just before it returns to the hand? 

A moving body undergoes uniform acceleration while travelling in a straight line between points X, Y and Z. The distances XY and YZ are both 40 m. The time to travel from X to Y is 12 s and from Y to Z is 6.0 s. What is the acceleration of the body?

A particle of mass $2m$ and velocity $v$ strikes a wall.

The particle rebounds along the same path after colliding with the wall. The collision is inelastic. What is a possible change in the momentum of the ball during the collision?

Which defines the weight of a body?

The diagram shows a rope bridge that a student makes on an adventure training course. The student has a weight $W$.

Which formula gives the tension $T$ in the rope? 

A spanner is used to tighten a nut as shown.

A force $F$ is applied at right-angles to the spanner at a distance of $0.25\,\text{m}$ from the centre of the nut. When the nut is fully tightened, the applied force is $200\,\text{N}$.

What is the resistive torque, in an anticlockwise direction, preventing further tightening? 

The diagrams show a metal cube suspended from a spring balance before and during immersion in water.

A reduction in the balance reading occurs as a consequence of the immersion.

Which statement is correct? 

A box of weight 200 N is pushed so that it moves at a steady speed along a ramp, through a height of 1.5 m. The ramp makes an angle of 30° with the ground. The frictional force on the box is 150 N while the box is moving.

What is the work done by the person? 

A raindrop of mass $m$ is falling vertically through the air with a steady speed $v$. The raindrop experiences a retarding force $kv$ due to the air, where $k$ is a constant. The acceleration of free fall is $g$.

Which expression gives the kinetic energy of the raindrop?

The kinetic energy of a vehicle of mass 1000 kg is $4.5 \times 10^5$ J. It is stopped by applying a constant braking force of 6000 N.

What is its stopping distance?

What are units of work, energy and power?

Below are four short paragraphs describing the molecules in a beaker of water at 50°C.

Which paragraph correctly describes the molecules?

Which group of materials contains two polymers?

The pressure at sea level is approximately 100 000 Pa. The density of sea water is 1030 kg m^-3.

What is the approximate pressure 80 m below the surface of the sea?

Two wires P and Q are made from the same material.

Wire P is initially twice the diameter and twice the length of wire Q. The same force, applied to each wire, causes the wires to extend elastically.

What is the ratio of the extension in P to that in Q?

To determine the mass of food in a pan, a scale is used that has high sensitivity for small masses but low sensitivity for large masses.

To do this, two springs are used, each with a different spring constant $k$. One of the springs has a low spring constant and the other has a high spring constant.

Which arrangement of springs would be suitable?

The amplitude of a wave is $A$ and its intensity is $I$.

Which amplitude is necessary for the intensity to be doubled to $2I$?

Which value is a possible wavelength for radiation in the ultra-violet region of the electromagnetic spectrum?

The diagram shows two tubes.

The tubes are identical except tube X is closed at its lower end while tube Y is open at its lower end. Both tubes have open upper ends. A tuning fork placed above tube X causes resonance of the air at frequency $f$. No resonance is found at any lower frequency than $f$ with tube X.

Which tuning fork will produce resonance when placed just above tube Y? 

A microwave transmitter emits waves towards a metal plate. The waves strike the plate and are reflected back along their original path.

A microwave detector is moved along the line PT.

Points P, Q, R, S and T are the positions where minima of intensity are observed. These points are found to be 15 mm apart.

What is the frequency of the microwaves? 

A double slit experiment, using light of wavelength 600 nm, results in fringes being produced on a screen. The fringe separation is found to be 1.0 mm.

When the distance between the double slits and the viewing screen is increased by 2.0 m, the fringe separation increases to 3.0 mm.

What is the separation of the double slits producing the fringes?

The diagram shows a vertical uniform electric field in a vacuum. 

An electron gun injects a beam of electrons horizontally into the field.

Which changes, if any, have occurred to the path and speed of the electrons by the time the beam leaves the field? 

A very small oil drop of mass $m$ carries a charge $+q$.

The potential difference across the plates is $V$ and the separation is $d$.

The weight of the drop is balanced by the electric force. (Buoyancy forces may be considered to be negligible.)

Which formula gives the charge on the drop?

Which electrical component is represented by the following symbol?

When there is no current in a wire, which statement about the conduction electrons in that wire is correct?

A high-resistance voltmeter connected across a battery reads 6.0 V.
When the battery is connected in series with a lamp of resistance of 10 \( \Omega \), the voltmeter reading falls to 5.6 V.
Which statement explains this observation?

A battery of e.m.f. 12 V and internal resistance 2.0 $\Omega$ is connected in series with an ammeter of negligible resistance and an external resistor. External resistors of various different values are used. Which combination of current and resistor value is not correct?
[Table_1]

A wire PQ is made of three different materials, with resistivities $\rho$, $2\rho$ and $3\rho$. There is a current $I$ in this composite wire, as shown. Which graph best shows how the potential $V$ along the wire varies with distance $x$ from P?

The diagram shows part of a circuit. What is the resistance between the points P and Q due to the resistance network?

The diagram shows a potential divider circuit.

The light level increases.
What is the effect on the resistance of the light-dependent resistor (LDR) and on the output voltage?

Three resistors, with resistances $R_1$, $R_2$, and $R_3$, are connected in series and are found to have a combined resistance of 500 Ω. When connected in parallel, the combined resistance is found to be 50 Ω.
Which values will correspond to these results?
[Table_1]

In the Rutherford scattering experiment, $\alpha$-particles were fired at a thin gold foil. A small proportion of the $\alpha$-particles were deflected through large angles.
Which statement gives the correct conclusion that could be drawn directly from these results?

Which statement about the nuclei of the atoms of an element is correct?

A counter recording radioactive decays from a radioactive source gives the following counts in equal intervals of time.
[Table_1]
What can be deduced from these readings?