03 9702 22 2RP Afp M23
03 9702 22 2RP Afp M23
03 9702 22 2RP Afp M23
* 0 1 5 5 7 5 9 7 6 2 *
PHYSICS 9702/22
Paper 2 AS Level Structured Questions February/March 2023
1 hour 15 minutes
INSTRUCTIONS
● Answer all questions.
● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use a calculator.
● You should show all your working and use appropriate units.
INFORMATION
● The total mark for this paper is 60.
● The number of marks for each question or part question is shown in brackets [ ].
DC (RW/SG) 314268/2
© UCLES 2023 [Turn over
2
Data
Formulae
upthrust F = ρgV
fs v
Doppler effect for sound waves fo = v!v
s
1 1 1
resistors in parallel = + + ...
R R1 R2
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(b) A toy car moves in a horizontal straight line. The displacement s of the car is given by the
equation
v2
s=
2a
where a is the acceleration of the car and v is its final velocity.
State two conditions that apply to the motion of the car in order for the above equation to be
valid.
1 ................................................................................................................................................
2 ................................................................................................................................................
[2]
(c) An experiment is performed to determine the acceleration of the car in (b). The following
measurements are obtained:
s = 3.89 m ± 0.5%
v = 2.75 m s–1 ± 0.8%.
(iii) Use your answers in (c)(i) and (c)(ii) to determine the absolute uncertainty in the
calculated value of a.
[Total: 7]
motor
Z wire
block,
weight 1.4 × 104 N
X
The base of the block takes a time of 0.49 s to move vertically upwards from level X to level Y at a
constant speed of 0.64 m s–1. During this time the wire has a strain of 0.0012. The wire is made of
metal of Young modulus 2.2 × 1011 Pa and has a uniform cross-section.
The block has a weight of 1.4 × 104 N. Assume that the weight of the wire is negligible.
(a) Calculate:
A = .................................................... m2 [2]
(ii) the increase in the gravitational potential energy of the block for the movement of its
base from X to Y.
Calculate the input power to the motor as the base of the block moves from X to Y.
(c) The base of the block now has a uniform deceleration of magnitude 1.3 m s–2 from level Y
until the base of the block stops at level Z.
Calculate the tension T in the wire as the base of the block moves from Y to Z.
T = ...................................................... N [3]
(d) The base of the block is at levels X, Y and Z at times tX, tY and tZ respectively.
On Fig. 2.2, sketch a graph to show the variation with time t of the distance d of the base of
the block from level X. Numerical values of d and t are not required.
0
tX tY tZ
t
Fig. 2.2
[2]
[Total: 13]
C
17 N
0.35 m 0.15 m
string
50°
horizontal
A B
hinge
beam
W 12 N
The beam has length 0.50 m and weight W. A block of weight 12 N rests on the beam at a distance
of 0.15 m from end B.
The beam is held horizontal and in equilibrium by a string attached between end B and a fixed
point C. The string has a tension of 17 N and is at an angle of 50° to the horizontal.
1 ................................................................................................................................................
...................................................................................................................................................
2 ................................................................................................................................................
...................................................................................................................................................
[2]
(b) Show that the vertical component of the tension in the string is 13 N.
[1]
(c) By taking moments about end A, calculate the weight W of the beam.
W = ...................................................... N [2]
(d) Calculate the magnitude of the vertical component of the force exerted on the beam by the
hinge.
(e) The block is now moved closer to end A of the beam. Assume that the beam remains
horizontal.
State whether this change will increase, decrease or have no effect on the horizontal
component of the force exerted on the beam by the hinge.
............................................................................................................................................. [1]
[Total: 7]
4 Two blocks slide directly towards each other along a frictionless horizontal surface, as shown in
Fig. 4.1. The blocks collide and then move as shown in Fig. 4.2.
X Y X Y
Block X initially moves to the right with a momentum of 0.37 kg m s–1. Block Y initially moves to
the left with a momentum of 0.65 kg m s–1. After the blocks collide, block X moves to the left back
along its original path with a momentum of 0.13 kg m s–1. Block Y also moves to the left after the
collision.
(b) Determine the magnitude of the momentum of block Y after the collision.
(c) Block X exerts an average force of 7.7 N on block Y during the collision.
Calculate the time that the blocks are in contact with each other.
[Total: 6]
5 (a) A microphone and cathode-ray oscilloscope (CRO) are used to analyse a sound wave of
frequency 5000 Hz. The trace that is displayed on the screen of the CRO is shown in Fig. 5.1.
1.0 cm
1.0 cm
Fig. 5.1
(ii) The intensity of the sound detected by the microphone is now increased from its initial
value of I to a new value of 3I. The frequency of the sound is unchanged. Assume that
the amplitude of the trace on the CRO screen is proportional to the amplitude of the
sound wave.
On Fig. 5.1, sketch the new trace shown on the screen of the CRO. [3]
(b) An arrangement for demonstrating interference using light is shown in Fig. 5.2.
3.6 × 10–4 m P
The wavelength of the light from the laser is 630 nm. The light is incident normally on the
double slit. The separation of the two slits is 3.6 × 10–4 m. The perpendicular distance between
the double slit and the screen is D.
Coherent light waves from the slits form an interference pattern of bright and dark fringes on
the screen. The distance between the centres of two adjacent bright fringes is 4.0 × 10–3 m.
The central bright fringe is formed at point P.
(i) Explain why a bright fringe is produced by the waves meeting at point P.
...........................................................................................................................................
..................................................................................................................................... [1]
D = ...................................................... m [3]
(c) The wavelength λ of the light in (b) is now varied. This causes a variation in the distance x
between the centres of two adjacent bright fringes on the screen. The distance D and the
separation of the two slits are unchanged.
On Fig. 5.3, sketch a graph to show the variation of x with λ from λ = 400 nm to λ = 700 nm.
Numerical values of x are not required.
0
400 700
λ / nm
Fig. 5.3
[1]
[Total: 10]
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...................................................................................................................................................
............................................................................................................................................. [1]
(b) The variation with potential difference V of the current I in a semiconductor diode is shown in
Fig. 6.1.
0
0 0.5 1.0
V/V
Fig. 6.1
..................................................................................................................................... [1]
(ii) the variation, if any, in the resistance of the diode as V changes from V = 0.75 V to
V = 1.0 V.
..................................................................................................................................... [1]
(c) A battery of electromotive force (e.m.f.) 12 V and negligible internal resistance is connected to
a uniform resistance wire XY, a fixed resistor and a variable resistor, as shown in Fig. 6.2.
12 V
2.7 A
resistance
wire
Z
X Y
1.6 m
2.0 m
1.5 A 5.0 Ω W
The fixed resistor has a resistance of 5.0 Ω. The current in the battery is 2.7 A and the current
in the fixed resistor is 1.5 A.
(iii) Wire XY has a length of 2.0 m. Point Z on the wire is a distance of 1.6 m from point X.
The fixed resistor is connected to the variable resistor at point W.
By considering the currents in every part of the circuit, state and explain whether the
total power produced by the battery decreases, increases or stays the same.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [3]
[Total: 12]
By comparing the number of protons in each nucleus, state and explain whether the charge
of nucleus X is less than, the same as or greater than the charge of:
(i) nucleus Y
...........................................................................................................................................
..................................................................................................................................... [1]
(ii) nucleus Z.
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(b) Hadrons can be divided into two groups (classes), P and Q. Group P is baryons.
..................................................................................................................................... [1]
(ii) Describe, in general terms, the quark structure of hadrons that belong to group Q.
...........................................................................................................................................
..................................................................................................................................... [1]
[Total: 5]
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