physics

1 what is a reasonable estimate of the volume of an adult person?
a 0.10m° b 0.50m* cc 1.0m? d 2.0m°

2 which combination of units could be used for expressing the power dissipated in a resistor?
a newton per second (ns*‘)
b_ newton second (ns)
c newton metre (nm)
d newton metre per second (nms~*)

3. a force of 10n and a force of 5n act on an object.
10n
150°
5n
object

the angle between the forces is 150°.
the resultant force on the object can be resolved into a pair of perpendicular components.
which row shows numerical expressions for a possible pair of perpendicular components?
| | force component/n force component/n

a 10cos30°-5 10 cos 30°

b 10 sin30° —5 10 cos 30°

cc 10 — 5cos 30° 5sin 30°

d 10 — 5sin30° 5cos 30°

4  assignal of frequency 25 hz is displayed on the screen of a cathode-ray oscilloscope.
pet et ty ei
=>
icm
what is the time-base setting?
a 10mscm"* b 20mscm* c 25mscm™ d 40mscm*

5 amicrometer screw gauge is used to measure the diameter of a wire.
the reading on the micrometer with the jaws closed is (—0.05 + 0.02)mm.
the reading with the wire in position between the two jaws is (+1.03 + 0.02)mm.
what is the diameter of the wire?
a (0.98 + 0.02)mm
b (1.08 + 0.02)mm
c (0.98 + 0.04) mm
d (1.08 + 0.04)mm

6 a projectile is launched at an angle to the horizontal at time t=0. it travels over horizontal
ground, as shown.
path of projectile
ground
air resistance is negligible.
which graph best shows the variation with t of the speed of the projectile from when it is launched
to when it lands on the ground?
a b
speed speed
0 0
0 t 0 t
cc d
speed speed
0 0
0 t 0 t
le ee

7 a train, initially at rest at a station, has a uniform acceleration of 0.20ms~ until it reaches a
speed of 20ms". it travels for a time at this constant speed and then has a uniform deceleration
of 0.40ms~ until it comes to rest at the next station. the distance between the two stations is
3000 m.

what is the time taken by the train to travel between the two stations?
a 75s b 150s c 230s d 300s

8 a rocket is fired from the earth into space.
newton’s third law of motion describes how forces act in pairs. one of the forces of a pair is the
weight of the rocket.
what is the other force of this pair?
a air resistance
b force of the exhaust gases on the rocket
c force of the rocket on the exhaust gases
d gravitational force of the rocket on the earth

9 the graph shows how quantity p varies with quantity q for a body falling vertically downwards in
a uniform gravitational field with air resistance.
| pe
0
0 q

which pair of quantities could be represented by p and q?

a acceleration force of air resistance

b acceleration time

cc velocity force of air resistance

d velocity time

10 which quantities are conserved in an inelastic collision?
(| teicenerey —[__tealenery | tnear momentum
a conserved not conserved conserved
b conserved not conserved not conserved
cc not conserved conserved conserved
d not conserved conserved not conserved

11 acharged oil drop is held stationary between two charged parallel plates.
top plate ee
charged oil drop
bottom plate ts
which forces act on the oil drop?
a both electric and gravitational
b electric only
c gravitational only
d neither electric nor gravitational

12 vwvnicn pair of forces forms a couple with a torque of 30nm?
a b
30n 40n
1.0m
2.0m
10n
30n
cc d
25n 15n
1.0m
2.0m
5n
—_—_—_—_.
15n

13 a uniform rigid bar xz with negligible mass is 1.20m long. the bar is pivoted at point p. three
coplanar forces act on the bar as shown. forces of 16n and 20n act perpendicularly to the bar
at points x and y respectively. force f acts at point z at an angle of 30° to the axis of the bar.
the distances along the bar of the pivot and of the forces are shown.

z 30°

20n 2 [=
16n y 0.60m
p .
9 0.30m
x ae m

the bar experiences a resultant moment about p of 6.0 nm in a clockwise direction.
what is the magnitude of f?
a 9.2n b 11n cc 16n d 24n

14 water of depth 9.0cm is covered by oil of depth 5.0cm in a measuring cylinder.
the density of the water is 1000 kgm~ and the density of the oil is 800 kgm”.
what is the total pressure exerted on the base of the measuring cylinder due to the oil and water?
a 390pa b 880pa c 1200pa d 1300pa

15 a rocket is fired upwards.
as it accelerates upwards after leaving the launch pad, which forms of energy are changing?
a_ chemical energy, gravitational potential energy and kinetic energy
b_ chemical energy and gravitational potential energy only
c_ chemical energy and kinetic energy only
d gravitational potential energy and kinetic energy only

16 a roll of tape of length 50m requires a constant force of 20 n to unwrap it.
20n
roll of tape =
tape
what is the work done in unwrapping the whole roll?
a 0.4j b 2.5j c 500j d 1000j

17 a trolley of mass 600 kg is initially at point p on a slope, at a height of 80m above ground level,
as shown. the trolley is released from rest and moves along the slope, first coming to rest at
point q, at height h above ground level.

trolley
mass 600kg
a
not to
p scale
q 80m
: 1.5km
“fh slope
h ground level
the total distance pq moved by the trolley along the slope is 1.5km. a constant resistive force of
300 n opposes the motion of the trolley on the slope.
what is h?
a 3.5m b 76m cc 79m d 80m

18 an object of weight 15.0n is pulled along a horizontal surface at a constant velocity of 2.00ms™.
the force pulling the object is 12.0n at 30.0° to the horizontal, as shown.
2.00ms" ree
930.0"
15.0n
what is the power used to move the object?
a 12.0w b 20.8w c 24.0w d 30.0w

19 the spring constants of four springs are determined by plotting the following graphs of force f
against extension x.
q 2 3 4
0 -prngy 20 rere enagy oo pmo mo anrocne ng?

7 va 7 va 7 va 7 va
() 0) ) )
0 5 0 4 0 0.1 0 0.5
x/mm x/mm x/mm x/mm
which order of the graphs shows decreasing spring constants?
a 2515354
b 3>4>52->1
c 4525153
d 453>52->1

20 forces are applied to the ends of a rod so that its length increases. the variation with force f of
the extension e of the rod is shown.
e
p
0
0 f
the point p is the elastic limit.
which shaded area represents the work done during the plastic deformation of the rod?
a b
e 4 ef ty
p p.
0 : 0
0 f 0 f
c d
ef yy e '
ene |
0 0 ' '
0 ie 0 f

21 two identical waves are produced by sources at points p and q. the waves travel along different

paths to reach point r, as shown.

p ee. r

100m

q re
both waves have a wavelength of 6.0cm. the waves are in phase at point r.
what is the phase difference between the waves as they leave points p and q?
a 0° b_ 60° cc 90° d = 120°

22 a longitudinal wave travelling from left to right has vibrations parallel to the direction of transfer of
energy by the wave.
the wave can be represented on a graph showing the variation with distance of the displacement
of the particles from their equilibrium positions at one instant.
which point on the graph is the centre of a compression?
direction of
transfer of energy
a is
displacement
to the right
b d
0
0 distance
‘ from source
displacement
to the left
cc

23 a stationary wave is formed trom two identical sound waves.
a microphone is placed at a position of maximum loudness. it is then moved along the stationary
wave from this first position of maximum loudness to the fourth position of maximum loudness.
the microphone moves a distance of 12cm.
the speed of sound is 330ms™".
what is the frequency of the sound waves?
a 4100hz b  5500hz c 8300hz d 11000hz

24 an ambulance has a siren that emits sound of a constant frequency. the ambulance is moving
directly towards a stationary observer.
the ambulance decelerates as it is approaching the observer and then accelerates after it has
passed the observer.
how does the frequency of the sound heard by the observer change as the ambulance is
approaching and as it is moving away from the observer?
approaching moving away
observer from observer
a decreases decreases
b decreases increases
cc increases decreases
d increases increases

29 microwaves in a vacuum travel at speed x and nave wavelengin of order of magnitude y.
what are the speed and a possible order of magnitude of wavelength of x-rays in a vacuum?
[| seccd | wovelnath

a x 10°y
b x 10“y
cc 10°x ¥
d 10°x ¥

26 the diagram shows part of a stationary wave on a string.
x and y are points on the string. the vibrations at x and y are 180° out of phase.
ns | string
positions of string
when x and y are at
maximum displacement
what is the distance between x and y?
a one-quarter of a wavelength
b half a wavelength
cone wavelength
d_ two wavelengths

27 which wave behaviour is shown in the diagram?
horizon
sea wall sea
= a =a 7 _—_—— 7 sea wall
ne beach
wavefronts

a diffraction

b_ doppler shift

c interference

d superposition

28 a teacher sets up the apparatus shown to demonstrate a double-slit interference pattern on a
screen.
single iat screen
slit |
source | a
of “ q |
|
p f
which change to the apparatus will increase the fringe spacing?
a decrease the distance p
b_ decrease the distance q
c_ decrease the distance r
d_ decrease the wavelength of the light

29 light of a single unknown wavelength and blue light of a single wavelength are both incident
normally on a diffraction grating. two diffraction patterns are produced, one for each wavelength
of light.

the third-order maximum for the blue light occurs at the same angle as the second-order
maximum for the light of unknown wavelength. the wavelength of the blue light is 480 nm.

what is the unknown wavelength?

a 320nm b 720nm c 960nm d 1440nm

30 what is the electric field strength in a region where a proton accelerates at 2.00 ms~ due to the
field?
a 11.4pvm" b 5.22nvm" c 10.4nvm" d 20.9nvm"

31 an oil drop of mass 2.6 x 10-°kg and with a charge of —4.8 x 10-"°c is in a vacuum between two
horizontal plates. the plates have a separation of 2.0cm and a potential difference (p.d.) between
them of 1200v, as shown.

+1200v
oil dro}
plates pg cm
ov
which statement describes the motion of the oil drop?
a _ltis stationary.
b_ it has a downward acceleration of 9.7ms”.
c_ithas an upward acceleration of 1.3ms~.
d_ it has an upward acceleration of 11ms~.

32 which two units are used to define the coulomb?
a ampere and second
b ampere and volt
c_ volt and ohm
d_ volt and second

33 a mobile phone battery is charged by connecting it to a constant potential difference of 5.0v.
after a time of 1.0 hour, the initial current of 0.50 a slowly decreases to zero, as shown.
0.5
— in
0
0 1.0 2.0
time/hours
what is the best estimate of the energy transferred to the battery during the time of 2.0 hours
shown in the graph?
a 2700j b 9000j c 14000j d 18000j

34 a length of wire is connected into an electric circuit. the current in the wire is measured.
which change on its own could increase the current in the wire?
a _anincrease in the length of the wire
b_anincrease in the radius of the wire
c_anincrease in the resistance of the wire
d_anincrease in the resistivity of the wire

35 a cell is described as having an electromotive force (e.m.f.) of 6v.
what does this mean?
a 1 coulomb of charge always dissipates 6 j of energy in the internal resistance of the cell.
b_ 1 electron gains 6 j of energy when passing through the cell.
c_ there is a potential difference of 6 v applied across any external circuit connected to the cell.
d when 1 coulomb of charge passes through the cell, 6 j of chemical energy is transformed.

36 the diagram shows a network of resistors. each resistor has resistance r.
r
ld
r
x r a ¥
oa l_ o
ial
l
what is the total resistance of the network between points x and y?
a & bp or g u8 d 6r
6 11 6

37 three resistors are connected in series with a battery, as shown. the battery has negligible

internal resistance.

1200

—_
6.0v | 180q
—_l

1500
what is the potential difference across the 180 resistor?
a 1.6v b 2.4v c 3.6v d 4.0v

38 a potentiometer circuit is used to determine the unknown electromotive force (e.m.f.) of a cell x.
in the circuit shown, e is a cell with an e.m.f. that is known accurately. qr is the potentiometer
wire, which has a movable contact s. contact s is connected to a galvanometer and to cell x.

e
ss
—
x
what is not a necessary requirement to determine the e.m.f. of x from the circuit?
a_ the e.m.f. of cell x must be lower than the e.m.f. of cell e.
b_ the internal resistance of cell x must be known.
c_ the lengths qs and qr must be determined accurately.
d_ the resistance of the wire qr must be proportional to its length.
ce eee eee ee ne co ee ee oo ooo eo7-_

39 a nucleus of uranium, “,3;u, undergoes a series of decays. during the series of decays, two
a-particles and one f particle are emitted.
as a result, a nucleus of actinium, ac, is formed.
what is the correct notation for the nuclide of actinium that is formed?
a ac b ac cc ac d ac

40 which particle is a fundamental particle?
a electron
b hadron
c neutron
d proton

Solve 9702_s21_qp_11