physics

1. which unit is equivalent to the coulomb?
a ampere per second
b_ joule per volt
c_ watt per ampere
d_ watt per volt

2 which row shows a quantity and an incorrect unit?
a ee ee
a efficiency no unit
b | moment of force nm“
cc momentum ns
d work done j

3 two forces of equal magnitude are represented by two coplanar vectors. one is directed towards

the east and the other is directed towards the north.

what is the direction of a single force that will balance these two forces?

a __ towards the north-east

b_ towards the north-west

c towards the south-east

d towards the south-west

lee

4 the density of paper is 800kgm~. a typical sheet of paper has a width of 210mm and a length of
300 mm.
the thickness of a pack of 500 sheets of paper is 50mm.
what is the mass of a single sheet of paper?
a 0.5g b 5g c 50g d 500g

5  aperson calculates the potential difference across a wire by using the measurements shown.
which measured quantity has the greatest contribution to the percentage uncertainty in the
calculated potential difference?

a current/a 5.0 +0.5

b diameter of wire/mm 0.8 +0.1

cc length of wire/m 150 +5

d | resistivity of metal in wire/qm 1.6 x 10° +0.2 x 10%

6 a cathode-ray oscilloscope (c.r.o.) is connected to an alternating voltage. the following trace is
produced on the screen.
pt ett tt tt
lal | i att a
halal | tall total
yi lt ea a
p| {| yyy | ft
pt att te
pl ata aye
pl tat tat at
pp py
i a
dom
the oscilloscope time-base setting is 0.5ms cm” and the y-plate sensitivity is 2vcm".
which statement about the alternating voltage is correct?
a the amplitude is 3.5cm.
b_ the frequency is 0.5 khz.
c_ the period is 1 ms.
d_ the wavelength is 4cm.

7 a stone of mass m is dropped from a tall building. there is significant air resistance. the
acceleration of free fall is g.
when the stone is falling at a constant (terminal) velocity, which information is correct?
magnitude of magnitude of the magnitude of the
the acceleration force of gravity force of air resistance
of the stone on the stone on the stone
a g zero mg
b zero mg mg
cc zero zero mg
d zero mg zero

8 the velocity-time graph for an object is shown.
0
soa 7 time

how can the total displacement of the object be determined?

a area 1-—area2

b (area 1+area 2)

2
c area1+area2
d area 2-area 1

10 steel pellets, each with a mass of 0.60g, fall vertically onto a horizontal plate at a rate of 100
pellets per minute. they strike the plate with a velocity of 5.0ms™ and rebound with a velocity of
4.0ms".

what is the average force exerted on the plate by the pellets?
a 0.0010n b  0.0054n c 0.0090n d 0.54n

11 the diagram shows four forces applied to a circular object.
45n
30n
30n
45n
which row describes the resultant force and resultant torque on the object?
| | resultant force resultant torque
a non-zero non-zero
b non-zero zero
cc zero non-zero
d zero zero

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

13 in which example is it not possible for the underlined body to be in equilibrium?
a an aeroplane climbs at a steady rate.
b_ an aeroplane tows a glider at a constant altitude.
c a speedboat changes direction at a constant speed.
d_ two boats tow a ship into harbour.
i eet

14 acar of mass 1100kg is travelling at a constant speed of 15ms_ up a slope inclined at 10° to the
horizontal. the combined frictional forces acting on the car are directed down the slope and are
equal to os where wis the weight of the car.

15ms*
tes,
am ni ana yt ep i
what is the useful output power of the car’s engine?
a 28kw b 32kw c 60kw d 190kw

15 an old-fashioned 60w lamp converts 95% of its energy supply into heat. a 4.0w modern lamp
has the same power output of light as the old-fashioned lamp.
what is the efficiency of the modern lamp?
a 5.0% b 6.7% c 75% d 95%

16 a bead is released from rest at point p and slides along a wire, as shown.
p
a not to
+ scale
14ms' q
h
40cm
the track loops around and forms a vertical circle of diameter 40cm. at point q, the bead has a
speed of 1.4ms™.
air resistance and friction on the wire are negligible.
what is the height h from which the bead is released?
a 0.30m b 0.40m c 0.50m d 0.60m
eoe _o—o—eeeeyeyeyeeeeeeeeeeeeeeeeeee ss !:2:2800qe_—e

1/7 a smail diesel engine uses a volume of 1.5 x 10°cm” of fuel per nour to produce a useful power
output of 40 kw. it may be assumed that 34kj of energy is transferred to the engine when it uses
1.0 cm’ of fuel.
what is the rate of transfer from the engine of energy that is wasted?
a 102kw b 142kw c 182kw d 470kw

18 two boxes x and y have the same mass. box x is lifted vertically through a height h by a force of

magnitude f.

box y is pulled along a slope by a force of the same magnitude to reach the same height, as

shown.

f
box x box y

which statement is correct?

a_ both boxes gain the same amount of gravitational potential energy and the same amount of
work is done by the two forces.

b_ both boxes gain the same amount of gravitational potential energy but more work is done by
the force acting on box y than by the force acting on box x.

c_ box y gains less gravitational potential energy than box x because the weight of box y is
less than the weight of box x.

d_ box y gains more gravitational potential energy than box x as more work is done by the
force acting on box y than by the force acting on box x.

19 ine force-extension grapn of a metal wire is shown.
at which point on the graph does the metal wire stop obeying hooke’s law?
force
d
c
b
a
0
0 extension

20 the diagram shows a large crane on a construction site lifting a cube-shaped load at a constant

speed.

cable

crane
load
lol
a model is made of the crane, its load and the cable supporting the load.
the material used for each part of the model is the same as that in the full-size crane, cable and
load. the model is one tenth full-size in all linear dimensions.
what is the ratio stress in the cable on the full-size crane 2
stress in the cable on the model crane

a 0.1 b 1 cc 10 d 100

21 awave pulse moves along a stretched rope in the direction shown.
—>
—f
which diagram shows the variation with time t of the displacement s of the particle p in the rope?
a b
ss ss
0 0
| , | ,
cc d
ss ss
0 0
| ! | ,

22 a wave has period 7, wavelength 2 and amplitude a. the wave is shown on a graph of
displacement x against distance d.
which graph is correctly labelled?
a b
x x
a a
0 0
0 | d 0 d
| - ! | .
— 4 —
cc d
x i i i x
0 a 0 } a
0 d 0 ! d

23 the table lists possible orders of magnitude of the wavelengths of some of the principal radiations

of the electromagnetic spectrum.
which row shows the correct orders of magnitude of the wavelengths?
oe

a 10° 10° 10°? 10°

b 10“ 10° 10°" 10°?

c 107 10° 10° io"

d 10? 10“ 10° 10°

24 a vehicle carries a microwave transmitter that emits microwaves of a constant frequency. a
stationary observer has a microwave receiver.
the vehicle moves directly towards the observer at constant speed. the observer detects
microwaves of frequency f,.
the vehicle then accelerates, still moving towards the observer, travels at higher steady speed
for a time and then decelerates until it stops.
what is the variation in the frequency of the microwaves that are detected by the observer?
a_ the observed frequency will fall, then remain steady then return to the frequency fo.
b_ the observed frequency will fall, then remain steady then rise to a higher frequency than fo.
c_ the observed frequency will rise, then remain steady then fall to a lower frequency than f,.
d_ the observed frequency will rise, then remain steady then return to the frequency fo.

25 the diagram shows a cathode-ray oscilloscope display of an electromagnetic wave.
\ / 1.0cm
—\____—_

the time base setting is 0.20 uscm™'.

which statement is correct?

a_ the frequency of the wave is 2.5 mhz and it lies in the microwave region of the
electromagnetic spectrum.

b_ the frequency of the wave is 2.5 mhz and it lies in the radio-wave region of the
electromagnetic spectrum.

c_ the frequency of the wave is 5.0 mhz and it lies in the microwave region of the
electromagnetic spectrum.

d_ the frequency of the wave is 5.0 mhz and it lies in the radio-wave region of the
electromagnetic spectrum.

nn eoettee____

26 in a double-slit interference experiment, light of frequency 6.0 x 10°"hz is incident on a pair of
slits. bright fringes that are 3.0 mm apart are observed on a screen some distance away.
what is the separation of the bright fringes when the frequency of the light is changed to
5.0 x 10'4hz?
a 1.8mm b 2.5mm c 3.0mm d 3.6mm

27 monochromatic light is incident on a pair of narrow slits a distance of 0.1mm apart. a series of
bright and dark fringes are observed on a screen a distance of 2.0m away. the distance between
adjacent bright fringes is 8.0mm.

screen
monochromatic | second order dark fringe
ee ‘zero’ order bright fringe
| }~distance between
2.0m bright fringes = 8.0mm
(not to scale)
what is the path difference between the light waves from the two slits that meet at the second
order dark fringe?
a 2.0x10’m
b 4.0x10’m
c 6.0x 107m
d 8.0x10’m

28 a tube of length l is open at both ends. a stationary wave is set up in this tube when a tuning fork
vibrating with frequency f, is held at one end. this is the lowest frequency of stationary wave that
can be formed in this tube.

another tube of length 2l is closed at one end. a stationary wave is set up in this tube when a
tuning fork vibrating with frequency f, is held at the open end. this is the lowest frequency of
stationary wave that can be formed in this tube.

/ frequency f,

eb
/ frequency f,
2b

assume the end correction for each tube is negligible.
which equation is correct?
a n= 4 b r= c f=2f, d ££=4f,

29 which statement gives a condition that enables diffraction to occur?
a a source of waves moves towards a stationary observer.
b  awave is partially blocked by an obstacle.
c_ two coherent waves are superposed.
d two waves of equal speed and frequency are travelling through the same part of a medium
in opposite directions.

30 an electron passes into the space between two parallel plates that are 5.0cm apart and which

are maintained at electric potentials of +2000 v and —500v, respectively.

“ | +2000 v

soon] sisson,

- ot —500v
what is the electric force on the electron?
a 1.6x10-°n
b 48x 107°n
c 64x 10°°n
d 80x 107°n

31 which statement about electric charges in a uniform electric field is not correct?

a electric charges of the same magnitude, whether positive or negative, experience the same
magnitude of force when placed in the same uniform electric field.

b- the direction of the force on a positive charge placed in a uniform electric field is
independent of the magnitude of the charge.

c the magnitude of the force on a positive charge placed in a uniform electric field is
proportional to the magnitude of the electric field strength.

d_ the work done to move a positive charge a certain distance in a uniform electric field is
independent of the direction of the movement.

32 the diagram shows a simple circuit.
ss l |
|

which statement is correct?

a when switch s is closed, the e.m.f. of the battery falls because work is done against the
internal resistance of the battery.

b when switch s is closed, the e.m.f. of the battery falls because work is done against the
resistance of r.

c when switch s is closed, the potential difference across the battery falls because work is
done against the internal resistance of the battery.

d when switch s is closed, the potential difference across the battery falls because work is
done against the resistance of r.

33 a resistor has resistance r. when the potential difference across the resistor is v, the current in
the resistor is j. the power dissipated in the resistor is p. work wis done when charge q flows
through the resistor.

what is not a valid relationship between these variables?
a pe b oe g a= p r=
vv vv i p

34 awire of resistance 9.55q has a diameter of 0.280 mm.
it is made of metal of resistivity 4.90 x 10-7 qm.
what is the length of the wire?
a 1.20m b 4.80m cc 19.0m d 76.8m

35 charge carriers, each of charge q, move along a wire of fixed length. the number density of the
charge carriers in the wire is n.
what is also required, for this wire, to determine the average drift velocity of the charge carriers in
terms of n and q?
a current per unit of cross-sectional area
b potential difference per unit of length
c_ resistance and cross-sectional area
d resistivity and length

36 a potential divider circuit is constructed with one variable resistor x and one fixed resistor y, as
shown.
x vy
na w
the potential difference across resistor x is vy and the potential difference of resistor y is vy.
as the resistance of x is increased, what happens to vx and to vy?
a
a falls rises
b falls stays the same
cc rises falls
d rises stays the same

37 a cell of electromotive force (e.m.f.) e and negligible internal resistance is connected into a
circuit, as shown.
20
ld
. | im ¢

the voltmeter has a very high resistance and reads a potential difference vou.

: ~ vout
what is the ratio “?

e

a 1 b 1 ce dp 2

6 3 2 3

38 five resistors are connected as shown.
200 8.00
[| [|
6.00 8.00
[| [|
p q
7.00
[|
what is the total resistance between points p and q?
a 0.250 b 0.610 c 400 d 160

39 a nucleus of neptunium-236 contains 93 protons and 143 neutrons. this nucleus decays with the
emission of an a-particle. the nucleus formed then emits a 6 particle.
which diagram shows the changes in the number p of protons and the number n of neutrons in
these nuclei?
a b
146 146
not fe tt te) omy tet tt
wel | lz wo | be
a_| | | [| fey | |
wal la ltt volt | lt
we ve) ele
138+—__—_ 138
90 92 94 96 90 92 94 96
p p
cc d
146 146
mot | tt er] ot ttt tt
ol ll pll vol tle
vot | | tt vol kl [tti
ot le ttt “pcc
138 138
90 92 94 96 90 92 94 96
p p

40 an isolated neutron decays to produce a proton, a 8 particle and an antineutrino.
which row gives the quark composition of the neutron and the proton and the type of force that
gives rise to this reaction?
quark composition
type of force

a down, down, up down, up, up strong interaction

b down, down, up down, up, up weak interaction

cc down, up, up down, down, up strong interaction

d down, up, up down, down, up weak interaction

Solve 9702_m18_qp_12