Worksheet: 02
Secondary School
Secondary ___
Science Department
Name :
Title:
Register No :
Ch 1 Physical Quantities, Units and Measurements
• Physical quantities and SI units
1
Class :
(a)
Date :
• Measurement
Complete the table by filling the units for each base quantity.
base quantity
SI unit
current
mass
time
(b)
Complete the table by filling the power for each prefix.
prefix
symbol
10-9
nano
tera
2
T
The table gives details of some units of energy.
Complete the table by filling in the blank spaces.
unit
symbol
multiple of the
SI unit (J)
joule
J
1
kilojoule
kJ
gigajoule
1 000 000 000
mJ
3
Power
0.001
Name the most appropriate apparatus used to measure the following.
(a)
inner diameter of a test tube,
.................................................................................................................
(b)
diameter of a wire,
.................................................................................................................
(c)
waist of a lady.
.................................................................................................................
1
4
A pendulum bob swings between P and R. It passes through Q, the middle of
the oscillation, as shown below.
pivot
string
pendulum bob
R
P
Q
The timing starts when the bob is at P. The bob completes 25 oscillations in
40 seconds.
(i)
Calculate the period of the pendulum.
period = ……………………s [1]
(ii)
Determine whether the pendulum bob is at position P, Q or R after 12
s.
position…………………… [1]
(iii)
Suggest a suitable instrument that can be used to record the timing of
the oscillations.
…………………………………………………………………………..
5
[1]
i) If the time taken for a pendulum to swing 20 oscillations are 150s, what is the
period of the pendulum?
ii) If the time taken for a pendulum to swing from A to B is 0.2s, what is the period of
the pendulum?
iii) If the time taken for a pendulum to swing one
oscillation is 1.2s, what is the time taken for the pendulum
to swing from A to C and then back to B?
2
6
A digital micrometer screw gauge is used to measure the diameter of a small ball
bearing.
(a)
Describe how the digital micrometer screw gauge needs to be adjusted
before using it.
……………………………………………………………………………..……
(b)
Fig. 2.1 shows the readings of a digital micrometer screw gauge when it is
used to measure the diameter of the small ball bearing at 2 different
positions.
Showing your working clearly, calculate the average diameter of the ball bearing,
correct to 2 decimal places.
average diameter = …………………... mm
(c)
A student suggests using a digital micrometer screw gauge to measure the
external diameter of a beaker.
State and explain if you agree with this suggestion.
………………………………………………………………………………………
………………………………………………………………………………………
3
Q1
ampere,
kilogram,
seconds
n,
1012
Q2
1000,
GJ,
milli
Q3
Digital vernier
caliper,
digital
micrometer
screw gauge,
measuring
tape
Q4
1.6 s,
R,
digital
stopwatch
Q5
7.5 s,
0.8 s
0.9 s
Q6
Check for
zero error.
18.81 mm
The diameter
of the beaker
is out of the
range of the
digital
micrometer
screw gauge
4