physics

1. amanis running a race in a straight line.
what is an approximate value of his kinetic energy?
a 10j b 100j cc 1000j d 10000j

2 asample of gas has a mass of 4.8 ug and occupies a volume of 1.2dm”.
what is the density of the sample of gas?
a 4.0x10°kgm®
b 4.0x 10°kgm®
c 40x 10°%kgm®
d 4.0x 10°kgm?

3 which characteristics are possessed by a vector quantity but not by a scalar quantity?
a direction only
b- magnitude and direction
c magnitude and unit
dunit only

4 a circuit is set up in order to determine the resistance of a 12v, 1.2w lamp when operating
normally. an analogue ammeter and an analogue voltmeter are used.
which ranges for the meters would be most suitable?
ammeter range | voltmeter range
ia iv

a 0-0.5 0-20

b 0-0.5 0-100

cc 0-10 0-20

d 0-10 0-100

29 [wo liquid-in-glass thermometers in a well-mixed liquid are individually observed by 10 different
students. all agree that one thermometer reads 21°c and the other thermometer reads 23°c.
what is a possible explanation for the difference?

a the liquid is not all at the same temperature.

b_ the readings are not precise.

c_ there is a random error affecting the readings.

d__ there is a systematic error affecting the readings.

6 the graph shows how the velocity of a ball varies with time from the moment it is hit vertically
upwards from the ground.
20
velocity
ims* 15
10
5
0
0 1 2
+ time/s
2 (henner
what is the displacement of the ball from the ground after a time of 3.0s?
a 15m b 25m cc 30m d 45m

7 two students each throw a ball horizontally from the top of a tower. the two balls are released at
the same time.
the first student throws her ball with a speed of 20ms™' and the second student throws his ball
with a speed of 10ms™*.
assume air resistance is negligible and that the balls land on horizontal ground.
which row describes the horizontal distances travelled and the landing times of the two balls on
the ground?
hedzantel landing times
distances 9
a same same
b same different
cc different same
d different different

8 a ball of mass m travels vertically downwards and then hits a horizontal floor at speed u.
it rebounds vertically upwards with speed v.
the collision lasts a time at.
what is the average resultant force exerted on the ball during the collision?
a tm downwards
at
p oo upwards
at
cc cil downwards
at
d eae upwards
at

9 the resultant force f on a raindrop of mass m falling vertically with velocity v is given by the
equation
f=mg-kv?
where k is a constant and g is the acceleration of free fall.
the falling raindrop eventually reaches a constant (terminal) velocity.
which graph shows the variation of the terminal velocity of the raindrop with mass m?
a b
terminal terminal
velocity velocity
0 0
0 m 0 m
cc d
terminal terminal
velocity velocity
0 0
0 m 0 m

10 a ball of mass m, moving at a velocity v, collides with a stationary ball of mass 2m.
the two balls stick together.
which fraction of the initial kinetic energy is lost on impact?
as b 3 eg dg

11. asubmarine is in equilibrium in a fully submerged position.
ee — sea
steel water
aire a
what causes the upthrust on the submarine?
a the air in the submarine is less dense than sea water.
b_ there is a difference in water pressure acting on the top and on the bottom of the submarine.
c_ the sea water exerts a greater upward force on the submarine than the weight of the steel.
d_ the submarine displaces its own volume of sea water.

12 two forces, each of magnitude f, act along the edges of a rectangular metal plate, as shown.
<—__+*—_+ f
b
f
the plate has length a and width b.
what is the torque about point p?
a fa b fb c 2fa d 2fb

13 a non-uniform rod has a mass of 100g and a length of 50cm. it is supported by a chain at its
midpoint. the rod is held in equilibrium by having a mass of 60g suspended from its right-hand
end, as shown.

centre
non-uniform rod _ of gravity aainsn ;
pporting the
of mass 100g of rod rod at its midpoint
50cm
ae
er mass 60g
the centre of gravity of the rod is a distance d from its left-hand end.
what is the value of d?
a 10cm b 15cm c 25cm d 40cm

14 a light rigid rod xy has an object of weight vw tixed at one end. [he rod is in equilibrium, resting
on a support at z and a vertical wall at x. the support exerts a force r on the rod as shown. the
diagram shows the directions, but not the magnitudes, of the forces r and w.

wall—__ v
ww
r
z.
xx
what is the direction of the force on the rod at x?
a b cc d

15 liquid q has twice the density of liquid r.
at depth x in liquid r, the pressure due to the liquid is 4kpa.
at which depth in liquid q is the pressure due to the liquid 7 kpa?
a bf 3 me ge se ye
7 8 7 2

16 a trolley starts from rest at x. it rolls down to y and eventually comes to rest at z.
xx
f z
xy
which row is a possible summary of the energy changes during this process?
[[xey [vez |
a pe > ke ke > pe key
b pe > ke ke > pe + heat pe = potential energy
cc pe — ke + heat ke > pe ke = kinetic energy
d pe — ke + heat ke — pe + heat
lee ee. a

17 acylinder is heated, causing the air inside to expand at a constant pressure of 2.2 x 10° pa.
seeeeaeee | piston raised
piston 0.50m
—=
cylinder
air pressure ee
22x107pa =
the expansion of the air causes the piston to rise through a vertical distance of 0.50m, doing
11kj of work. frictional forces are negligible.
what is the cross-sectional area of the piston?
a 1.0 x 10m?
b 2.5x 10m?
c 5.0 x 10m?
d 1.0 x 10-'m?

18 a ball slides down a curved track, as shown.
x
ne
0.40m

point x is at a height of 0.40 m above point y. the speed of the ball at point x is 2.5ms™'.
frictional forces are negligible.
what is the speed of the ball at point y?
a 28ms" b 3.2ms' c 3.8ms" d 14ms'

19 the force diagram shows an aircraft accelerating. at the instant shown, the velocity of the aircraft
is 40ms*.
velocity 40ms"
—————
6ookn lift
200kn is“. 500kn
air resistance a engine thrust
600 kn weight
at which rate is its kinetic energy increasing?
a 2.4mw b 8.0mw cc 12mw d 20mw

20 the diagram shows a simplified model of a building with four identical heavy floors.
top rods
floors
middle rods
bottom rods
the spacing of the bottom floor from the ground is twice that of the spacing between the floors.
between each floor are equal numbers of vertical steel supporting rods of negligible mass
compared with the floors. the rods are of different diameters so that the stress in each rod is the
same.
what is the ratio diameter of bottom rods 2
diameter of top rods
a 2 b 4 cc 8 d 16

21 the achilles tendon in a rabbit’s leg is stretched when the rabbit jumps.
the graph shows the variation with tension of the length of the tendon.
40
lengthimm = | de fee
eee
88 -ceeeeeeeeeeeee eee
heber eee eee eee eee eee
eee
36 -heeeeeeee sp
>|
berle eee
eee eee ee eee eee
34 see ee eee
eeeeeeeeeeee eee eee
lh eere eere
eeeeeregeeeeeeeeeeeee re hce|
30 ccea
eere eee ee eee eee eee eee
eeceeeeeeeeeeee eee eee
30 -eeeeeeeeee eee}
0 100 200 300 400 500
tension/n
what is the strain energy in the tendon when the tension is 400 n?
a 0.40j b_ 0.80j c 24j d 7.4j

22 awave of amplitude a has an intensity j.
after passing through a certain medium, the wave has a new intensity of z
what is the new amplitude of the wave?
a 2a pa ¢ a p a
2 4 16

23 awave travels along a coiled spring.
the graph shows the variation with time of the displacement of a point on the spring.
displacement
mv a fa a

0 or 0.3 9.4

| time/s
what is the frequency of the wave?
a 0.13hz b 0.20hz c 5.0hz d 7.5hz

24 a loudspeaker is set up at the open end of a closed tube containing powder.
when the loudspeaker produces sound of frequency 1200hz, a stationary wave is produced in
the tube. the powder gathers at the nodes of the stationary wave as shown.
nene ss eee

25 a stationary source s emits a sound wave of frequency f.
the source now moves away from a stationary observer.
which statement is correct?
a the frequency of the source s and the observed frequency are now both higher than f.
b_ the frequency of the source s and the observed frequency are now both lower than f.
c_ the frequency of the source s is now lower than f.
d_ the observed frequency is now lower than f.

26 the table lists possible wavelengths of four different electromagnetic waves.
which row is correct?
| bees tom
a infrared 10°
b radio 10°
c ultraviolet 10°?
d x-rays 107”

27 a vertical tube is partially filled with water. a sound wave moves down the tube and is reflected
by the surface of the water. the frequency of the sound wave is gradually increased from zero
until a much louder sound is heard.

sound
tube
water
water is then removed from the tube until a second louder sound is heard.
which diagram shows the new pattern of the stationary wave that is formed?
a b cc d

28 water waves in a ripple tank are made to pass through a small gap as shown.
which diagram shows the waves after they have passed through the gap?

a b
y (
x

cc d
1
bn *

29 a double-slit interference experiment is set up using green light.
a pattern of interference fringes is formed on a screen.
which single change will increase the separation of the fringes?
a increase the width of each slit
b- move the screen nearer to the double slit
c_ use slits that are further apart
d_ use red light instead of green light

30 light of a single wavelength from a distant point source falls normally onto a diffraction grating
positioned with its lines vertical.
diffraction
grating
—
light from :
distant ——= >
point source =
_——___—_% eye of
student
not to scale
the plane of the diffraction grating is at right angles to the incident light. a student looks at the
grating from a position near to the grating.
what could the student see?
a acentral point source with a series of point source images on either side
b_acentral vertical line with a series of spectra on either side
c_aseries of fine vertical lines
d_asingle point source

31 which diagram best represents the electric field between two point charges of equal magnitude
and opposite sign?
a b c d

32 a negatively charged oil drop of mass m is between two horizontal parallel metal plates a
distance d apart.
oil drop
mass m
horizontal
+ metal plates
d
when the potential difference (p.d.) between the plates is v, the oil drop rises at a constant
speed. when the p.d. is decreased to a value v2 the oil drop falls at the same constant speed.
air resistance acts on the drop when it is moving. the upthrust on the drop is negligible.
the acceleration of free fall is g.
what is the charge on the oil drop?
a mdg b mdg cc 2mdg d 2mdg
vi-v2 vi+v2 vi-v2 vi+v2

33 the unit of electric charge is the coulomb.
what is meant by 1 coulomb?
a _ the charge passing a point in 1 second when a current produces 1 joule of work
b_ the charge passing a point in 1 second when a current produces 1 watt of power
c_ the charge passing a point in 1 second when there is a current of 1 ampere
d_ the charge passing a point in 1 second when there is 1 ohm of resistance

34 two copper wires are joined together and carry a current, as shown.
_——.— |
su eeeciae =
current 7 current
wire p wite@
cishnsted diameter 2d
wire p has diameter d and wire q has diameter 2d.
what is the ratio average aritt speed of the free electrons im wt pr 2
average drift speed of the free electrons in wire q
a b 1 é 2 d4
4 2

35 a power supply of electromotive force (e.m.f.) v and negligible internal resistance is connected in
the circuit shown. there is a current of 3.0a in the 4.0 resistor.
vv
og op gs
o o
[|
[|

what is the value of v?
a 15v b 29v c 39v d 51v

36 the wire of a heating element has resistance r. the wire breaks and is replaced by a different
wire.
data for the original wire and for the replacement wire are shown in the table.
" resistivity
f =

original wire 1 d p

replacement wire 1 2d 2p
what is the resistance of the replacement wire?
a r br cr d 2r

4 2

37 a fixed resistor and a variable resistor are connected in series with a cell that has an internal
resistance, as shown.
r

the graph shows the variation of a quantity x with the resistance r of the variable resistor as r is
increased from zero to its maximum value.

aa

0

0 r

what could x represent?
a the current in the circuit
b__ the electromotive force of the cell
c the potential difference across the internal resistance
d the terminal potential difference across the cell

38 a cell of electromotive force (e.m.f.) 4.0v and negligible internal resistance is connected to a
fixed resistor of resistance 1.0 and a potentiometer of maximum resistance 3.0q, as shown.
4.0v 3.00 ¥
1.00

x
which range of potential differences can be obtained between the terminals x and y?
a 0vto3.0v
b ov to 4.0v
c 1.0v to 3.0v
d 1.0v to4.0v

39 radiation from a radioactive source has a range of a few millimetres in air and can be deflected
by an electric field.
which type of radiation is being emitted?
a a-radiation
bf radiation
c_ b* radiation
dy-rays

40 which equation describes the process of b* decay?

key:
u = up quark
d = down quark
v = (electron) neutrino
v= (electron) antineutrino

a ddu > uud + bp + v

b ddu > uud + p* + v

c uud - ddu + p° + v

d uud > ddu + p* + v

Solve 9702_s20_qp_13