physics

1. whatis the best estimate of the kinetic energy of a family car travelling at 50kmh"'?
a 15x 10°j b 1.5x 10°j cc 1.5x10'j d 1.5x 109j

2 ~the diagram shows two vectors x and y. the vectors are perpendicular to one another.
— y=6.0n
x= 8.0n

what is the magnitude and direction of vector (x — y)?

a 10.0n at an angle of 37° downwards from the direction of x

b- 10.0n at an angle of 37° upwards from the direction of x

c 14.0n at an angle of 53° downwards from the direction of x

d  14.0n at an angle of 53° upwards from the direction of x

3. which expression using si base units is equivalent to the volt?
a kgm’?s ta"
b kgms7a
c kgm’s'a
d kgm’s°a*

4 a voltage is carefully measured with a high-quality instrument and found to be 2.321 v.
two students, using two different methods, conclude that the voltage is 2.33v and 2.344v
respectively.
which statement is correct?
a 2.33v is less accurate and less precise than 2.344 v.
b  2.33v is less accurate and more precise than 2.344v.
c 2.33v is more accurate and less precise than 2.344v.
d  2.33v is more accurate and more precise than 2.344v.

5 on a planet, a vertically-launched projectile takes 12.5s to return to its starting position. the
projectile gains a maximum height of 170m. the planet does not have an atmosphere.
what is the acceleration of free fall on this planet?
a 2.2ms? b 8.7ms* c 27ms* d 54ms?

6 a displacement-time grapn tor a toy car is shown.
2
displacement/m
0 time/s
0 2 4\6 8 10
-2
which graph shows the variation with time of the velocity v of the car?
a b
2 2
v/ms" v/ims"
0 time/s 0 time/s
0 2 8 10 0 2 8 10
-2 -2
cc d
2 2
o " o " kee
0 time/s 0 time/s
0 4 6 8 10 0 2 4 6 8 10
a at tt

7 a driver stops his car in time t by gradually increasing the total braking force on the car. the
graph shows the resultant force on the car.
force
0
0 t
time
which graph shows how the speed of the car will vary during this time?
a b
speed | speed .
0 0
0 t 0 t
time time
cc d
speed speed /
0 0
0 t 0 t
time time

8 the graph shows the variation of a quantity y with a quantity x for a body that is falling in air at
constant (terminal) velocity in a uniform gravitational field.
quantity y a
0
0 quantity x

which quantities could x and y represent?
a

a air resistance acceleration

b loss of height gain in kinetic energy

c | loss of potential energy | work done against air resistance

d time velocity

9 a ball of mass 2.0kg travels horizontally with a speed of 4.0ms_'. the ball collides with a wall
and rebounds in the opposite direction with a speed of 2.8ms™'. the time of the collision is
150 ms.

what is the average force exerted on the wall?
a 16n b 37n c 53n d 91n

10 an ice-hockey puck of mass 150g moves with an initial speed of 2.0ms™' along the surface of an
ice rink.
the puck slides a distance of 30m in a straight line before stopping.
what is the average frictional force acting on the puck?
a 0.010n b  0.020n c 0.067n d 0.44n

11 a uniform beam of mass 1.4kg is pivoted at p as shown. the beam has a length of 0.60m and p
is 0.20m from one end. loads of 3.0kg and 6.0kg are suspended 0.35m and 0.15m from the
pivot as shown.

; 0.40m f 0.20m ,
‘.jp$s$v$avr\_ss i h_$§$_——— ir
1 i 0.35m ' 045m i |
fl oo om 1
3.0kg ; p 6.0kg
centre of beam
of mass 1.4kg
what is the torque that must be applied to the beam in order to maintain it in equilibrium?
a 0.010nm b 0.10nm cc 0.29nm d 2.8nm

12 an air bubble is rising through a liquid at a constant speed. the forces on it are the upthrust u,
the viscous drag d and its weight w.
which diagram shows the directions and relative sizes of the forces?
a b cc d
u u u
u
d
wy wy
e ww

13 the diagram represents a sphere under water. p, q, r and s are forces acting on the sphere due
to the pressure of the water.
”’:) cater surface
‘
<=

,
each force acts perpendicularly to the sphere’s surface. p and r act in opposite directions
vertically. q and s act in opposite directions horizontally.
which information about the magnitudes of the forces is correct?
a p<rands=q
b p>rands=q
c p=rands=qandp<s
d p=rands=qandp=s

14 the first column in the table gives four examples of work being done. the second column gives
more detail of the action.
which row is not correct?
pf evapo tat
a a girl dives from a diving work is done by the girl against
board into a swimming pool the gravitational field as she falls
b aman pushes a car work is done by the
along a level road man against friction
cc an electron is accelerated towards work is done on the electron
a positively charged plate by the electric field of the plate
d a piston is pushed outwards work is done on the
as a gas expands atmosphere by the gas

15 a steam turbine is used to drive a generator. the input power to the turbine is p; and the output
power is po. the power loss in the turbine is p_, as shown below.
input power p, output power p,
power loss p,
what is the efficiency of the turbine?
a & bp ft c fh p fo
po po p, py

16 a constant force pushes a block along a horizontal frictionless surface. the block moves from
rest through a fixed distance.
what is the relationship between the final speed v of the block and its mass m?
a de ge b vom cc ve d vv om
m jim

17 aman has a mass of 80kg. he ties himself to one end of a rope which passes over a single fixed
pulley. he pulls on the other end of the rope to lift himself up at an average speed of 50cms".
what is the average useful power at which he is working?

a 40w b  0.39kw cc 4.0kww d 39kw

18 two wires with the same young modulus e and cross-sectional area a, but different lengths l,
are subject to different tensile forces f. the extension e of each wire is the same.
the column headings in the table show four different quantities.
which quantities have the same value and which quantities have different values for the two
wires?
if, ae =a
e l fl
a different different same
b different same same
cc same different different
d same different same

19 two springs x and y stretch elastically. the graphs show the variation with extension x of the
force f applied to each spring.
spring x spring y
20> sansa ssanemnan apy 80> sean
fin fin
0 0
0 10 0 5
x/cm x/cm
which statement is correct?
a when each spring is given the same extension, the energy stored in y is 4 times the energy
stored in x.
b when each spring is given the same extension, the energy stored in y is 8 times the energy
stored in x.
c when the same force is applied to each spring, the energy stored in y is 4 times the energy
stored in x.
d when the same force is applied to each spring, the energy stored in y is 8 times the energy
stored in x.

20 the diagram shows the force-extension graph for a steel wire, up to its breaking point.
280 spree trerciorscirinioreetmemeimii
force/n
200 pes ed
1505 ||
1004 | | :
505] |
4 ' '
0 5 10
extension/mm
what is the best estimate of the work done to break the wire?
a 2.1j b 2.3j c 244j d 2.5j

21 which statement about electromagnetic waves in a vacuum is correct?
a_ amplitude is inversely proportional to velocity.
b_ frequency is inversely proportional to wavelength.
c intensity is proportional to amplitude.
d_ velocity is proportional to wavelength.

22 a transverse wave travels along a rope. the graph shows the variation of the displacement of the
particles in the rope with distance along it at a particular instant.
direction of travel of wave
a
displacement :
0 distance/m
at which distance along the rope do the particles have maximum upwards velocity?
a 0.5m b 1.0m cc 1.5m d 2.0m

23 a trace is shown on the screen of a cathode-ray oscilloscope (c.r.0.).
alaa aals
pt pa ea
veap eae yt
pv ive vv mv |
pe ft 00m

=>
1.0cm
the time-base setting is 2.5mscm™ and the y-gain is 2.0vcm".
what is the frequency and the amplitude of the waveform displayed by the c.r.o.?
frequency amplitude
/hz iv
a 0.00375 4.0
b 0.00375 8.0
cc 267 4.0
d 267 8.0

24 a high-speed train approaches a stationary observer at a speed of 80ms™. the train’s horn
emits a sound of frequency 250 hz.
the speed of sound is 340ms™.
what is the observed frequency of the sound from the horn?
a 190hz b  200hz c 310hz d 330hz

25 which row shows a correct frequency in hz for each of the four principal radiations?
[| xrays | utvavoiet [microwaves | inred |
a 10" 10 108 10"
b 10" 10" 10 10°
c 10° 10" 10% 10%
d 10" 10" 10" 10%

26 a pipe of length 100cm is open at both ends. a loudspeaker situated at one end of the pipe can

emit sound of different wavelengths.
i 100cm
a el

aetna 1
pipe
at which wavelength can a stationary wave be produced in the pipe?
a 50cm b 75cm c 150cm d 300cm

27 monochromatic light is incident on a diffraction grating and a diffraction pattern is observed.
which row shows possible effects of replacing the grating with one that has twice as many lines
per millimetre?

number of orders of angle between first and
diffraction visible second orders of diffraction
a decreases decreases
b decreases increases
cc increases decreases
d increases increases

28 monochromatic light of wavelength j is incident on two narrow slits s; and sz, a small distance
apart. a series of bright and dark fringes are observed on a screen a long distance away from the
slits.

p
is,

—>—. screen
light es se.
wavelength 2

—>—.

[se

the nth dark fringe from the central bright fringe is observed at point p on the screen.
which equation is correct for all positive values of n?
a &p-—s p> 24

2
b sop = s,;p =nr
c s.p-—s,p =(n- 4)
d s,p-s;p=(nt+ $a

29 adipole is a pair of charges of equal magnitude, one negative and one positive. the electric field
of a dipole is shown below.
in which direction does the force act on an electron when at point x?
xx
a ® d

30 in auniform electric field, which statement is correct?
a all charged particles experience the same force.
b_ all charged particles move with the same velocity.
c_ allelectric field lines are directed towards positive charges.
d_ allelectric field lines are parallel.

31 two metal plates are a distance of 30cm apart in a vacuum.
a current exists between the two plates consisting of electrons moving at a constant speed of
1.5 x 10°ms™.
at any instant, there is always just one electron travelling between the plates.
what is the current between the plates?
a 3.2x107%a
b 8.0x10%a
cc 16x 107a
d 2.0x107a

32 the diagram shows a portable generator connected by cables to floodlights. the generator
produces a current of 10a at a constant potential difference (p.d.) of 240v.
the total resistance of the cables is 2q.
generator
10 anna
240v 1 ' 5
10a cables ! floodlights
10 beoeesd
what is the p.d. v across, and the power p delivered to, the floodlights?
pw ew
a 220 2000
b 220 2200
cc 230 2000
d 230 2300

33 a metal cube with sides of length a has electrical resistance r between opposite faces.
1. a
—_— oy
what is the resistance between the opposite faces of a cube of the same metal with sides of
length 3a?
a 9r b 3r c # p #
3 9

34 agraph of potential difference (p.d.) v across a cell against current j in the cell is shown.
vv
0
0 i
as the cell reaches the end of its useful life, its internal resistance increases and its electromotive
force (e.m.f.) decreases.
which diagram shows a graph of v against i for the cell nearing the end of its useful life?
a b cc d
vv : vv v v
q line of y ss
eo iain _ ‘
‘graph "he ss s
0 7 0 7 0 as 0 7
0 vi 0 ie 0 i 0 zi

35 a 20v d.c. supply is connected to a circuit consisting of five resistors l, m, n, p and q.
l m
{| {|
——se
7v drop
4vv
n / ac
p q
{| {|
+ =
o o
a
20v rise
there is a potential drop of 7v across l and a further 4v potential drop across n.
what are the potential drops across m, p and q?
potential drop | potential drop | potential drop
across m/v across p/v across q/v
a 9 7 13
b 13 7 13
cc 13 11 9
d 17 3 17

36 a potential divider circuit consists of a cell of negligible internal resistance in series with two
variable resistors of resistances r; and r2. the potential difference (p.d.) across the cell is vo.
the p.d. at the output is v.

r,

vo

r, }
which statement is correct?
a when r; increases, it takes a greater proportion of vo, so v decreases.
b when r; increases, the current through r; and r decreases, so v increases.
c when r; decreases, it takes a smaller proportion of vo, so v increases.
d when r; increases, the current through r,; and r2 decreases, so v decreases.

37 a nucleus of uranium-238, 28 u, decays in a series of steps to form a nucleus of lead-206,
2epb, as shown.
fu. se wevcnccrcen se epo
an a-particle or a 8 particle is emitted during each step.
what is the total number of b particles that are emitted?
a 6 b 8 cc 10 d 16

38 vvhich statement about a-particies is correct?
a a-particles emitted from a single radioactive isotope have a continuous distribution of
energies.
b_a-particles have less ionising power than f-particles.
c_ the charge of an a-particle is +1.60 x 10-"°c.
d_ the speeds of «-particles can be as high as 1.5 x 10’ms"'.

39 the nuclear equation shown has a term missing.
tec ae on 98 ® cccccvesesuse
what is represented by the missing term?
a_ an antineutrino
banelectron
c aneutrino
d_ apositron

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

Solve 9702_s17_qp_13