physics

1 what is a reasonable estimate of the volume of a fully inflated standard football?
a 600cm* b 6000cm?® c 60000cm* d 600000cm°

2 whatis not an s! base unit?
a coulomb
b_ kelvin
c_ kilogram
d_ second

3. which two quantities are both vector quantities?
a displacement and distance
b_ force and momentum
c_ torque and time
d_ weight and pressure

4 a calibration curve is shown for an ammeter whose scale is inaccurate.
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ammeter |
. seer eee eee
reading 0.6 -heeeeeeeeeeeeeeee eee
/ma eeeeeeeeeeeeeeeeeeeeeaeheeeh
he ccap
0.4 ss ee
sedoetteaetfoserccottrasttant
oa eeeccoaeheh
0.3 -eeeeeeeeeeee ee
se ago 2
5 a a bea (alalalalal ie aleteey
hee ela ete ett]
02 “cece cee
hee eeett]
0008? ao
0.1 fre
cree eere ee eeee eec
aee eee eee
eere
0 ca a a a a a aa li il i al ll ig il a bll
0 o01 02 03 04 05 06
current/ma
two readings taken on the meter at different times during an experiment are 0.13ma and
0.47ma.
by how much did the current really increase between taking the two readings?
a 0.30ma b 0.34ma c 0.40ma d 0.44ma

5 a student measures the length j and the period t of oscillation of a simple pendulum. he then
uses the equation shown to calculate the acceleration of free fall g.
t=2n fe
g
his measurements are shown.
(87.3 + 0.2)em
(1.9 + 0.05)s
what is the percentage uncertainty in his calculated value of g?
a 24% b 2.9% c 5.5% d 7.2%

6 an object moves in a straight line. the graph shows the variation with time t of the velocity v of
the object.
8 cot tce eee rer
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6 eere eee
eee eee ee eee eea
ecc ceeee cce ree eee |
4 serre ee
sedfoctteaprsceateastitas
eoc
9 eere
ecccc eee eee eee
bee eee eee
feet te
0 al — -}-+— +} —|--+-
0; 762) 041/06. (081 to
bzecocooceeeeeeeeerrt/ sa
~2 -occecceeee ee pr
at time ft = 0 the object is at point x.
what is the displacement of the object from point x at time tf = 0.80s?
a 1.6m b 1.8m cc 2.0m d 3.2m

7  anobject accelerates uniformly from rest to speed v. it then moves at constant speed v for a time
of 8.0s before decelerating uniformly to rest. the total time taken is 12.0s, and the total distance
travelled is 60m.

what is the speed v?
a 3.0ms‘ b 5.0ms" c 6.0ms™ d 15ms‘

8 a device for spraying paint consists of a box with its axes 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

9 a party balloon is filled with air and held stationary at a height of several metres above the
ground. the balloon is then dropped in still air.
which statement describes the motion of the balloon from the moment of release until just before
it hits the floor?
a the balloon decelerates continuously.
b_ the balloon falls at a constant speed and then decelerates.
c_ the balloon falls at a constant speed.
d_ the balloon initially accelerates and then reaches a constant speed.

10 an object of mass m travelling with speed 5u collides with, and sticks to, an object of mass 5m
travelling in the same direction with speed u.
5u u
—> ——_>
what is the speed with which the two objects travel together in the original direction?
a 34 bou cc by d 10
10 5 6

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

12 acouple applies a clockwise torque of 9.0nm to a circular disc.
which diagram shows this couple?
a b
9.0n 45n
50cm 20cm
9.0n _ oo 45n _ oo
c d
45n 9.0n
10cm 100cm
 @. 45n oo 9.0n

13 ashelf pq is attached to a vertical wall at p and supports a book.
the shelf is held horizontal by a rigid bar xy, as shown.
book
wall shelf
2 q
x
ue f w,
ww,
bar
the weight of the shelf is w, and the weight of the book is w.
the bar is at an angle @to the shelf and exerts a force f on the shelf.
the shelf is in equilibrium.
what are the magnitudes of the horizontal and the vertical components of the force of the wall on
the shelf at p?
[| poronia component | verical component
a fcos@ (w, + w — f cos 6)
b fcos@ (w, + wy — f sin 6)
cc fsing (w, + wh — f cos @)
d fsin6é (w, + w — f sin 0)

14 aglider is descending at constant speed at an angle of 15° to the horizontal. the diagram shows
the directions of the lift l, air resistance r and weight w acting on the glider.
l
r
gs = al
ww
which vector triangle could represent the forces acting on the glider?
a b cc d

15 a solid cylinder of density oc, cross-sectional area a and length x is submerged in a liquid of
density p.. the upper face of the cylinder is at a depth h below the surface of the liquid, as
shown.

surface of liquid
h
cross-sectional area a
sie
cylinder y x
the acceleration of free fall is g.
which expression gives the magnitude of the upthrust force acting on the cylinder?
a pcahg b pcaxxg c piahg d paxg

16 a ball drops onto a horizontal surface and bounces elastically.
what happens to the kinetic energy of the ball during the very short time that it is in contact with
the surface?
a most of the kinetic energy is lost as heat and sound.
b_ the kinetic energy decreases to zero and then returns to its original value.
c_ the kinetic energy remains constant because it is an elastic collision.
d_ the kinetic energy remains constant in magnitude but changes direction.

17 some gas in a cylinder is supplied with thermal energy q.
the gas does useful work in expanding at constant pressure p from volume vo to volume vr, as
shown.
. volume v, ;
oo _
gas |
pressure p |
‘ volume v, ,
which expression gives the efficiency of this process?
a pvo b ve c p(v;—vo) d (vi -vo)
q voq q voq

18 an object of mass 0.30kg is thrown vertically upwards from the ground with an initial velocity of
8.0ms"‘. the object reaches a maximum height of 1.9m.
how much work is done against air resistance as the object rises to its maximum height?
a 4.0j b 5.6j cc 9.6j d 15j

19 a water pump raises a mass of 27 x 10°kg of water through a vertical distance of 80m in a time
of 1.0 hour.
what is the average useful output power of the pump?
a 0.60kw b 5.9kw c 36kw d 350kw

20 a platform is suspended by four steel wires. each wire is 5.0m long and has a diameter of
3.0mm. the young modulus of steel is 2.1 x 10'' pa.
er aie wires
| /
/| | |
steel wires ——,
ca p> ae
si ya platform

the wires obey hooke’s law when a load of mass 200 kg is placed on the platform.
how far will the platform descend because of the extension of the wires?
a 1.7x10¢m b 41x10¢m c 1.7x10°m d 66x 10%m

21 a tensile force of 7.00 mn is applied to a sample of steel. this causes the sample to extend by
5.00 mm in the direction of the force. the sample obeys hooke’s law.
what is the work done to extend the sample?
a 17.5j b 35.0j c 17.5kj d 35.0kj

22 two waves x and y have the same frequency. the amplitude of x is 1.5a9 and the amplitude of
y is 2.5ao. the waves meet at a point and superpose to form a resultant wave.
for the resultant wave, what is the ratio jneeium possible inleosiiy»
minimum possible intensity
a 1.7 b 28 cc 4.0 d 16

23 the displacement-—time graph for an air particle in the path of a sound wave is shown.
displacement [--~as orta
0
time

which property of the sound wave must be increasing?

a amplitude

b_ frequency

c_ period

d_ speed

24 a sound wave is displayed on the screen of a cathode-ray oscilloscope (cro) as shown.
pet te el fem
=,
1cm
the time-base of the cro is set at 2.5mscm™.
what is the frequency of the sound wave?
a 50hz b 100hz c 200hz d 400hz

25 the horn of a train emits sound of frequency f;. while the horn is sounding, the train moves
directly towards a stationary person. the speed of the train is 0.20v, where v is the speed of
sound.

the frequency of the sound heard by the person is h.
p =.
what is the ratio —?
f,
0.80 1 1.2 1
a 1 b 1.2 : 1 d 0.80

26 two satellites in orbit around the earth are at a constant distance of 100km apart from each
other.
satellite x transmits a microwave pulse towards satellite y. the pulse takes time t to reach y.
satellite y then transmits a pulse of visible light towards satellite x.
what is the time taken for the pulse of light to reach x?
a 10°t b 10°t cc 10°t d t

27 a stationary wave is formed on a stretched string. the diagram illustrates the string at an instant
of time when the displacement of the string is at its maximum.
string
fixed i wl tsi—‘coocsc—s fixed
point point
p

the frequency of the wave is 250 hz. point p on the string has a vertical displacement of —1.0 mm.
what will be the vertical displacement of the point p after a time of 5.0ms?
a -1.0mm b= zero cc +0.5mm d +1.0mm

28 wvnat is meant by aiffraction?
a_ the change in observed frequency when a wave source moves relative to an observer
b_ the formation of nodes and antinodes by two progressive waves travelling in opposite
directions
c_ the spreading of a wave around the edge of an obstacle
d_ the superposition of two waves when they meet

29 in a dark room, a small source of red light illuminates two slits that are 0.75mm apart. a few
— beyond the slits, the light falls on a screen producing a series of equally spaced bright
which change would cause the distance between the bright lines on the screen to be reduced?

a change the source for one emitting blue light.

b_ reduce the distance between the light source and the slits.
c_ reduce the distance between the slits to 0.55 mm.

d_ reduce the intensity of the light source.

30 light of wavelength 5.30 x 10°’m is incident normally on a diffraction grating. the first-order
maximum is observed at an angle of 15.4° to the direction of the incident light.
what is the angle between the first-order and second-order diffraction maxima?
a 7.7° b 15.4° cc 16.7° d = 32.1°

31 a stationary particle is in an electric field.
the only force on the particle is that from the electric field.
in which case is the electric field strength 5.0 x 10°vm-"?
aa force of 1.6 x 10-n acting on an electron
ba force of 3.2 x 10-“n acting on an alpha-particle
ca force of 8.0 x 10°*n acting on an alpha-particle
d a force of 8.0 x 10°“n acting on a proton

32 a constant potential difference is applied between two horizontal metal plates. a charged oil
droplet is held stationary by the electric field between the plates.
__|
charged / metal plates
oil droplet ©
as some of the oil evaporates, the droplet loses mass and starts to accelerate. its charge
remains constant.
in which direction does the droplet accelerate, and which change needs to be made to the
separation of the plates in order to stop this acceleration?
direction of separation
acceleration of the plates
a downwards decrease
b downwards increase
cc upwards decrease
d upwards increase

33 two resistors r; and r2 are made from wire of the same material.

they are connected in parallel to each other in a circuit, as shown.

r,
=
[|

the diameter of r2 is half the diameter of r;.

the resistance of rz is three times the resistance of r;.

what is the value of the ratio average ait speed of free blectrons in r, 2

average drift speed of free electrons inr,
3 3 1 1
a 2 ba cs d 72

34 a student describes potential difference as the energy transferred per unit charge.
which statement about the energy transfer is correct?
a __ltis from electrical energy into other forms.
b _itis from other forms into electrical energy.
cit only takes place inside a power supply.
d it only takes place inside resistors.

35 a metal cube has a resistance of 4.0 between opposite faces.
ten of these cubes are put together to make a cuboid of 1 x 2 x 5 cubes.
feo
ty
there is no extra resistance where the faces of the cubes touch each other.
what is the resistance of the cuboid when connected between faces x and y?
a 160 b 2.00 cc 100 d 400

36 a cell is connected to a fixed resistor. over a long period of time, the internal resistance of the
cell increases.
what is the effect of the increase in internal resistance on the electromotive force (e.m.f.) of the
cell and on the power dissipated by the fixed resistor?
e.m.f. power dissipated

a decreases decreases

b decreases no change

cc no change decreases

d no change no change

37 four identical resistors are connected in a circuit, as shown.
30v
[au
xx ¥
the battery has negligible internal resistance and an e.m.f. of 30v.
what is the potential difference between the two points x and y?
a 6.0v b 15v cc 20v d 24v

38 a power supply and a solar cell are compared using the potentiometer circuit shown.
power supply
2.000 v
es r
p = q
40.0cm
“ay galvanometer
solar cell
the potentiometer wire pq is 100.0cm long and has a resistance of 5.00q. the power supply
has an e.m.f. of 2.000 v and the solar cell has an e.m.f. of 5.00 mv.
which resistance r must be used so that the galvanometer reads zero when ps = 40.0cm?
a 3950 b 4050 c 7952 d 80502

39 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
is) 8 16
which two nuclei are isotopes of the same element?
a pandq b pands c qandr d rands

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

Solve 9702_w20_qp_13