Worksheet: 01
Secondary ___
Science Department
Name :
Register No :
Title:
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
temperature
length
[1]
(b)
Complete the table by filling the power for each prefix.
prefix
symbol
Power
10-9
nano
μ
micro
[1]
2
(a)
Fill in the blanks with the appropriate physical quantities or its S.I. units.
physical quantity
S.I. unit
Weight
Newton
force
temperature
kilogram
[2]
(b)
State the base quantities in (a).
………………………………………………………………………………………………….[1]
1
3
(a)
Suggest the most appropriate measuring instrument to be used to measure the
following quantities in the table.
[2]
quantity to be measured
(b)
(i)
inner diameter of a cup
(ii)
circumference of a tree trunk
(iii)
thickness of a thin wire
measuring instrument
Select from the different lengths given and fill in the appropriate length for each of
the quantity in the table below.
4.5 m
100 m
0.4 Gm
50 nm
quantity
4
length
(i)
diameter of a human hair
(ii)
distance between Earth and Moon
(iii)
height of overhead-bridge in
Singapore
(iv)
size of a virus
[2]
Fig. 1.1 shows the swing of a pendulum.
O
Q
Fig.
P 1.1
(i)
Explain what is meant by the period of a simple pendulum.
………………………………………………………………………………………
(ii)
[1]
The pendulum in Fig. 1.1 takes 1 s to travel from O to P.
State the duration it will take for the pendulum to make one full swing.
duration = ………………..s
[1]
2
5
Zi Yan carries out an experiment to find the total time for 10 complete swings of a pendulum.
She repeats the experiment using different lengths of the pendulum. The results are shown
in the table below.
(i)
pendulum length / cm
time for 10 swings / s
0.0
0.0
10.0
6.2
20.0
8.8
30.0
10.8
40.0
12.6
50.0
14.0
On the grid provided below, plot these results, marking each point with a cross (x)
and draw a curved line of best fit for your plotted points.
time for 10
swings / s
0
10
20
30
40
50
60
70
80
length of pendulum / cm
(ii)
Suggest what Zi Yan can do to improve the accuracy of her experiment.
……...……………………….…...…………………………………………………………
3
6.
Convert the following:
a) 0.000 46 ks
= …………..……………….. s
b) 244 475.3 μs
= …………..……………….. s
c) 210 nm
= …………..……………….. m
d) 0.0002 μg
= …………..……………….. g
e) 448.5 cg
= …………..……………….. g
f)
0.000 34 μB
= …………..……………….. B
g) 4 096 B
= …………..……………….. GB
h) 91 000 B
= …………..……………….. MB
i)
= …………..……………….. ks
2 103 s
Speed, density and pressure conversion
7.
8.
Q1
K,
M
n,
10-6
Complete the following unit conversion of speed.
a) 90 km/h
= ……………………. m/s
b)
= ……………………. m/s
110 km/h
c) 1.3 m/s
= ……………………. km/h
d) 1782 m/s
= ……………………. km/h
Complete the following unit conversion of density.
a) 760 kg/m3
= ……………………. g/cm3
b) 12000 kg/m3
= ……………………. g/cm3
c) 5.1 g/cm3
= ……………………. kg/m3
Q2
Newton,
Kelvin,
Mass
Q3
Digital
vernier
caliper,
Q4
Time taken
for 1
complete
oscillation,
Measuring
Temperature, tape,
4s
mass
Digital
micrometer
screwgauge
Q5
Repeat
the time
taken for
10 swings
for each
length and
take the
average.
Q6
0.46s,
Q7
25,
Q8
0.76,
0.2444753 s,
30.6,
12,
2.1 x 10-7,
4.68,
5100
2 x 10-10,
6415
4.485 g
3.4 x 10-10,
100m ,
0.4 Gm,
4.5 m,
50 nm
4.096 x 10-6,
0.091 MB
2.103 ks
4
0
