1
cm
1
cm
The oscilloscope time-base setting is 0.5
ms
cm
–1
and the Y-plate sensitivity is 2
V
cm
–1
.
Which statement about the alternating voltage is correct?
A
The amplitude is 3.5
cm.
B
The frequency is 0.5
kHz.
C
The period is 1
ms.
D
The wavelength is 4
cm.
Space for working
PMT

6
© UCLES 2014
9702/12/M/J/14
4
A quantity
y
is to be determined from the equation shown.
y
=
2
q
px
The percentage uncertainties in
p
,
x
and
q
are shown.
percentage
uncertainty
p
6%
x
2%
q
4%
What is the percentage uncertainty in
y
?
A
0.5
%
B
1
%
C
16
%
D
192
%
5
A thermometer can be read to an accuracy of ±
0.5
°
C. This thermometer is used to measure a
temperature rise from 40
°
C to 100
°
C.
What is the percentage uncertainty in the measurement of the temperature rise?
A
0.5
%
B
0.8
%
C
1.3
%
D
1.7
%
Space for working
PMT