physics

1 what must be included in a record of a physical quantity?
a aninteger value for the quantity
ban sti unit
c anumerical value for the quantity
d  aunit expressed in base units

2 what is the ohm expressed in si base units?
a kgm’s®a* b_kg'm’s*a? c jca" d wa?

3. adesk has a true width of 50.0cm.
two students, x and y, measure the width of the desk.
student x uses a tape measure and records a width of (49.5 + 0.5) cm.
student y uses a metre rule and records a width of (51.4 + 0.1)cm.
which statement about the measurement of student x is correct?
a _itis less accurate and less precise than the measurement of student y.
b_itis less accurate but more precise than the measurement of student y.
c_itis more accurate and more precise than the measurement of student y.
d_itis more accurate but less precise than the measurement of student y.

4 the diagram shows two vectors, x and y, drawn to scale.
\ ,
if x = y —z, which diagram represents the vector z?
a b cc d

5 which equation, representing uniformly accelerated motion in a straight line, can be determined
using only the definition of acceleration?
a s=utt tat?
b s= 3(utv)t
c v=utat
d v*=u’+2as

6 anobject moves from rest with uniform velocity horizontally and uniform acceleration vertically.
which graph showing the variation with time of the displacement of the object from its initial
position is correct?

a b
horizontal vertical
displacement displacement
0 0
0 time 0 time
c d
horizontal vertical
displacement displacement
0 0
0 time 0 time

7 a device for spraying paint consists of a box with its faces horizontal and vertical. one of its
vertical faces contains small holes. paint is fed into the box under pressure via a vertical tube and
exits through the holes as fine streams moving horizontally.

paint in
paint out through holes
(only a few holes are shown)
the paint is ejected at a speed of 2.5ms™ through 400 holes, each of area 0.4mm*. the density
of the paint is 900 kgm”.
what is the horizontal force required to hold the device stationary as it ejects the paint?
a 0.36n b 0.90n c 2.3n d 900n

8 each diagram illustrates a pair of forces of equal magnitude.
which diagram gives an example of a pair of forces that is described by newton’s third law of
motion?
a b
total gravitational
resistive — driving force
forces zg\ is force
gravitational
force
cc d
support force lift
=p
weight
weight

9 two balls of identical shape and size but different masses are falling through the same liquid.
the sum of the drag force and upthrust acting on each ball is equal to its weight.
which statement about the two balls is correct?
a_ the heavier ball has a larger acceleration than the lighter ball.
b_ the heavier ball has a smaller deceleration than the lighter ball.
c_ the heavier ball is falling at the same speed as the lighter ball.
d_ the heavier ball is falling at a larger speed than the lighter ball.

10 a perfectly elastic collision occurs between two objects x and y. the mass of x is m and the
mass of y is 4m. object x travels at speed v before the collision and speed “ in the opposite
direction after the collision. object y is stationary before the collision.

3v
vv 5
—_ —— —_
m 4m m 4m
before after
what is the kinetic energy of y after the collision?
a 2 my b my? c my p sm?
10 50 50 5

11. what is not a requirement for two forces to act as a couple?
a the two forces act in opposite directions.
b_ the two forces act through the same point.
c_ the two forces combine to produce zero resultant force.
d_ the two forces have equal magnitude.

12 a uniform metre rule is pivoted at the 34.0 cm mark, as shown.
metre rule
4.0cm
eid aa landed
34.0cm

aa]
64g

the rule balances when a 64g mass is hung from the 4.0cm mark.

what is the mass of the metre rule?

a 38g b 44g c 120g d 136g

13 a volume of 1.5m® of water is mixed with 0.50 m* of alcohol. the density of water is 1000 kgm™®
and the density of alcohol is 800 kgm.
the volume of the mixture is 2.0m’.
what is the density of the mixture?
a 850kgm® b 900kgm° c 940kgm°? d 950kgm*

14 an object is falling at a constant speed through a viscous liquid. fy is the upthrust on the object
due to the liquid. w, is the weight of the liquid displaced by the object. wo is the weight of the
object.

which equation must be correct?
a fu=w

b fy = wo _ ww

(e fy = wo

d fu=wotwm

15 an airport has a mechanical system for moving luggage. the system uses a horizontal conveyor
belt, a sloping conveyor belt, a lift and a frictionless slide. a suitcase is moved around the airport
using this system.

>
10m ;
‘ conse so
ao ; os
is jeg#
2 ‘ 16m ‘
resistive forces opposing the motion of the suitcase are negligible.
for which movement of the suitcase is the net work done on the suitcase greatest?
a moving the suitcase a distance of 8m at a constant speed up the sloping conveyor belt
b- moving the suitcase a distance of 16m at a constant speed along the horizontal conveyor
belt
c_ moving the suitcase a distance of 10m at a constant speed vertically upwards on the lift
d moving the suitcase a distance of 12m at increasing speed downwards on the slide

16 acar moves along a horizontal road with a constant velocity v against a resistive force f.
the engine of the car has an efficiency of 25%.
what is the input power to the engine?
a — b = c 4.0fv d ace

17 an object of mass 0.40kg is projected into the air and follows a curved path above horizontal
ground.
bbjset path of object
mass 0.40kg
ground

or)

‘ 18m ;
the object takes a time of 1.5s to move along its path. the object lands a horizontal distance of
18m from its initial position. air resistance is negligible.
what is the kinetic energy of the object at its maximum height?
a oj b 24j cc 11j d 29j

18 a metal wire has length 5.2m and diameter 1.0mm. the metal has young modulus 360 gpa.

the wire is fixed at one end and a force is applied to the other end. the force extends the wire by
7.2mm. the wire obeys hooke’s law.

what is the force applied to the wire?

a 1.2x10°n

b 3.9x10°n

c 5.0x10?n

d 1.6 x 10°n

19 the graph shows how the length of a spring varies with the force applied to it.
force
fp poeceeres
0 1
0 by l,
length

the spring has unstretched length lo. when a force f is applied, the spring has length l;.
what is the work done in stretching the spring to length l,?
a 3fly b 5 f(li — lo) cc fl, d f(l,—lo)

20 a progressive wave of frequency 1.5 khz travels in a medium at a speed of 340ms™.
what is the minimum distance between two points on the wave that have a phase difference of
70°?
a 44cm b 88cm c 18cm d 23cm

21 graph 1 shows the variation with time of displacement at a fixed distance along a progressive
wave.
graph 2 represents the same wave and shows the variation with distance of displacement at an
instant in time.
graph 1
2.027" ==
displacement/cm
1.0
0 time/s
0 0.10 0.24 9.40
-1 y
-2.0
graph 2
2.072235
displacement/cm
1.0
0 distance/cm
0 30 60 20
-1 *y
-2.0
what is the speed of the wave?
a 5.0cms* b 48cms" c 150cms* d 300cms*

22 a vehicle moves with constant velocity along a road directly towards an observer. the observed
frequency of the sound from the vehicle changes as the vehicle moves past the observer.
which phenomenon explains the change in frequency?
a diffraction
b _ interference
c polarisation
d_ the doppler effect

23 an electromagnetic wave has a wavelength of 2.1 cm in a vacuum.
which region of the electromagnetic spectrum contains this wave?
a _ infrared
b- microwave
c_ radio wave
d visible light

24 asource of plane polarised light is observed through two polarising filters.
rotated
anticlockwise
x rotated
4 clockwise
source of oq \ aes
polarised light \ q i
pb
cb
polarising filters ‘ er
the filters are positioned so that the source appears at its brightest. one of the filters is then
rotated clockwise and the other filter is rotated anticlockwise through the same angle.
how does the source appear when both filters have been rotated 90° and 180° from their initial
positions?
| | | 80
a brightest brightest
b brightest darkest
cc darkest brightest
d darkest darkest

25 the diagram shows a string stretched between fixed points x and y. there is a stationary wave

on the string.

is)
“nn i
cn 7 sx
/ \ 7 \
/ \ / \
/ \ f \
x¢-----e----- oa ro. —----------py
' rp ff \ /
\ / \ /
\ / \ /
no 7 \.
~~ s ~s
t

the solid curve shows the string at a position of maximum displacement at time fo. the dashed

curve shows the other position of maximum displacement. the straight central dashed line shows

the mean position of the string.

point s on the string is directly above point p. point t on the string is directly below point q.

which statement is correct?

a asshort time after f, point r on the string will be displaced.

b_ ashort time after fo, points s and t on the string move in opposite directions.

c_ the distance between p and q is one wavelength.

d two moving points on the string that are equal distances from point r vibrate in phase.

26 the variation with distance x of the intensity i along a stationary sound wave in air is shown.
0
0 5.0 10.0 15.0
x/cm
the speed of sound in air is 340ms™.
what is the frequency of the sound wave?
a 1700hz b  2300hz c 3400hz d 6800hz

27 an experiment is set up to demonstrate the diffraction of water waves in a ripple tank.
the waves pass through a gap of width w and some diffraction of the waves is observed.
the wavelength of the waves is now doubled.

what is the new gap width needed to cause the same amount of diffraction as before?
a 0.5w bw c 2w d 4w

28 two coherent electromagnetic waves are travelling in a vacuum. the two waves meet at a point.
at this point, the two waves have different intensities.
which statement about the waves is not correct?
a_ they have a constant phase difference at the point.
b_ they have the same amplitude at the point.
c_ they have the same frequency.
d_ they travel at the same speed.

29 a parallel beam of light of wavelength 600 nm is incident normally on a diffraction grating.
the distance between adjacent slits in the grating is 2.0 x 10m. a screen is placed parallel to
the grating, at a distance of 1.50m from the grating. third-order diffraction maxima are observed
at the two ends of the screen, as shown.
screen
not to
diffraction scale
grating
third-order maxima
beam of light of '
wavelength 600 nm
1.50m
qh
what is the distance between the two ends of the screen?
a 1.4m b 2.7m c 3.1m d 6.2m

30 a metal wire is connected between the terminals of a cell so that there is a current in the wire.

which statement is correct?

a_ negatively charged electrons in the wire move from the negative terminal to the positive
terminal.

b- negatively charged nuclei in the wire move from the negative terminal to the positive
terminal.

c_ positively charged electrons in the wire move from the positive terminal to the negative
terminal.

d_ positively charged nuclei in the wire move from the positive terminal to the negative terminal.

31 two resistors of resistances r and 2r are connected in parallel with a battery of electromotive
force (e.m.f.) 12v and negligible internal resistance.
12v
pan
r
lt

a
the total power dissipated by the two resistors is 36 w.
what is the value of r?
a 0.50q b 2.70 c 4.00 d 6.009

32 awire has a length of 3.0m and is made of metal of resistivity 4.9 x 10°-7qm.
a potential difference (p.d.) of 12v is applied across the wire so that it has a current of 1.4a.
what is the cross-sectional area of the wire?
a 1.2x 107m?
b 1.7x 10°’ m
c 1.1 x 10m?
d 1.3 x 10°°m?

33 a cell of negligible internal resistance is connected in series with a thermistor, a fixed resistor and
an ammeter.
the thermistor is placed in a beaker of water and the temperature of the water is slowly
increased.
a graph of current ij against the temperature t of the thermistor is plotted.
which graph could show the variation of i with t?
a b cc d
i vi i i
i t t i

34 a battery with internal resistance is connected to a parallel arrangement of two resistors and a
switch s, as shown.
; nt -| [___h ;
. [lt
switch
ss
initially, switch s is open.
what happens to the voltmeter and ammeter readings when switch s is closed?
voltmeter ammeter
reading reading
a decreases increases
b decreases decreases
cc increases increases
d increases decreases

35 kirchhoff’s first law states that the sum of the currents entering a junction in a circuit is equal to
the sum of the currents leaving it.
the law is based on the conservation of a physical quantity.
what is this physical quantity?
a charge
b_ energy
c mass
d momentum

36 two resistors have a combined resistance of 34q when connected in series. the same resistors
have a combined resistance of 7.4q when connected in parallel.
what is the resistance of one of the resistors?
a 1590 b 1702 c 230 d 279

37 a potentiometer circuit is used to investigate the electromotive force (e.m.f.) of a cell x.
driver cell
2.0v
q pp r
sliding contact ; .
x resistance wire
the e.m.f. of cell x is known to be approximately 0.50 v.
the driver cell has negligible internal resistance and an e.m.f. of 2.0v. the sliding contact is
moved along the uniform resistance wire between ends q and r to a point p where the reading
on the galvanometer is zero.
what is an expression for the approximate length qp?
a qr b qr cc 2qr d 3qr
4 3 3 4

38 the table contains data for four different nuclei p, q, r and s.
of neutrons number
p 5 10
q 6 10
r 6 14
ss 8 16
which two nuclei are isotopes of the same element?
a pandq b pands c qandr d rands

39 which statement about fp” decay is correct?
a’ a neutron changes to a proton in the nucleus and an electron and an antineutrino are
emitted.
ba neutron changes to a proton in the nucleus and an electron and a neutrino are emitted.
c_ a proton changes to a neutron in the nucleus and an electron and an antineutrino are
emitted.
da proton changes to a neutron in the nucleus and an electron and a neutrino are emitted.

40 what is the quark composition of a hydrogen-3 nucleus, $h?
pss
a 4 5
b 5 4
cc 5 7
d lt 5

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