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Answer all questions
1. A
2 . A
3
A
4
A
2
5
6
Which row shows an SI base quantity with its correct unit?
SI base quantity
unit
A
charge
coulomb
B
current
ampere
C
potential difference
volt
D
temperature
degree Celsius
A pendulum bob is held stationary by a horizontal force H. The three forces acting on the bob are
shown in the diagram.
30°
T
H
W
The tension in the string of the pendulum is T. The weight of the pendulum bob is W.
Which statement is correct?
A
H = T cos 30°
B
T = H sin 30°
C
W = T cos 30°
D
W = T sin 30°
Space for working
3
7
The drag coefficient Cd is a number with no units. It is used to compare the drag on different cars
at different speeds. It is given by the equation
Cd =
2F
ρv nA
where F is the drag force on the car, ρ is the density of the air, A is the cross-sectional area of the
car and v is the speed of the car.
What is the value of n?
A
8
1
B
2
C
3
D
4
A signal that repeats periodically is displayed on the screen of a cathode-ray oscilloscope.
The screen has 1 cm squares and the time base is set at 2.00 ms cm–1.
What is the frequency of this periodic signal?
A
50 Hz
Space for working
B
100 Hz
C
125 Hz
D
200 Hz
4
9
Which estimate is realistic?
A
The kinetic energy of a bus travelling on an expressway is 30 000 J.
B
The power of a domestic light is 300 W.
C
The temperature of a hot oven is 300 K.
D
The volume of air in a car tyre is 0.03 m3.
10 Which unit is equivalent to the coulomb?
A
ampere per second
B
joule per volt
C
watt per ampere
D
watt per volt
11 Two forces of equal magnitude are represented by two coplanar vectors. One is directed
eastwards and the other is directed northwards.
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
Space for working
5
12 The spring constant k of a coiled wire spring is given by the equation
4
k = Gr 3
4nR
where r is the radius of the wire, n is the number of turns of wire and R is the radius of each of the
turns of wire. The quantity G depends on the material from which the wire is made.
What is a suitable unit for G?
A
N m–2
B
N m–1
C
Nm
D
N m2
Space for working
[Turn over
6
13 A 0.10 kg mass is taken to Mars and then weighed on a spring balance and on a lever balance.
The acceleration due to gravity on Mars is 38% of its value on Earth.
What are the readings on the two balances on Mars? (Assume that on Earth g = 10 m s–2.)
spring
balance / N
lever
balance / kg
A
0.38
0.038
B
0.38
0.10
C
1.0
0.038
D
1.0
0.10
14 What is equivalent to the unit of electric field strength?
J C m–1
A
B
N s A–1
C
kg m s–3 A–1
D
kg m3 s–3 A–1
15 The diagram shows the reading on an analogue ammeter.
5
10
milliamperes (mA)
0
15
Which digital ammeter reading is the same as the reading on the analogue ammeter?
display units
display reading
A
µA
1600
B
µA
160
C
mA
D
A
Space for working
16.0
1.60
7
16 A steel wire is stretched in an experiment to determine the Young modulus for steel.
The uncertainties in the measurements are given below.
measurement
uncertainty
load on wire
±2%
length of wire
±0.2%
diameter of wire
±1.5%
extension
±1%
What is the percentage uncertainty in the Young modulus?
A
1.3%
Space for working
B
1.8%
C
4.7%
D
6.2%