Aljalal-Phys101-Sept 2007-Ch1-page 1
Questions
Chapter 1
Measurement
1-1 Measuring Things
1-2 The International System of Units
1-3 Changing Units
1-4 Dimensional Analysis
1-5 Significant Figures
1-6 Order-of-Magnitude Calculations
1-7 Density
Aljalal-Phys101-Sept 2007-Ch1-page 2
1-3 Changing Units
M1-042
Express speed of sound, 330 m/s in miles/h
(1 mile = 1609 m )
A) 147 miles/h
B) 330 miles/h
C) 738 miles/h
D) 0.205 miles/h
E) 980 miles/h
Answer C
Aljalal-Phys101-Sept 2007-Ch1-page 3
1-3 Changing Units
M1-041
1 shake = 10-8 seconds. Find out how many nano seconds
(ns) are there in 1 shake.
(1 nano = 10-9)
A) .1 ns
B) 0.01 ns
C) 100 ns
D) 0.001 ns
E) 10 ns
Answer E
Aljalal-Phys101-Sept 2007-Ch1-page 4
1-3 Changing Units
M1-991
How many molecules of water are there in a cup containing
250 cm3 of water?
Molecular mass of H2O = 18 g/mole
Density of water = 1.0 g/cm3
Avogadro s number = 6.02 x 1023 molecules/mole
A)6.0 x 1023
B)8.4 x 1024
C)1.9 x 1026
D)3.7 x 1028
E)2.5 x 103
Answer B
Aljalal-Phys101-Sept 2007-Ch1-page 5
1-3 Changing Units
M1-991
Using the fact that the speed of light in space is about 3.00 x
108 m/s, determine how many miles light will travel in one
hour.
(1 mile = 1.61 km)
A)6.71x108 miles
B)2.50x106 miles
C)5.40x109 miles
D)8.32x103 miles
E)4.83x102 miles
Answer A
Aljalal-Phys101-Sept 2007-Ch1-page 6
1-4 Dimensional Analysis
M1-062
Suppose
Bn
A= m
C
where A has dimensions LT, B has dimensions L2T−1, and C
has dimensions LT2. Then the exponents n and m have the
values:
A) n = 1/5 ; m = 3/5
B) n = 2 ; m = 3
C) n = 4/5 ; m = −1/5
D) n = 1/5 ; m = −3/5
E) n = 1/2 ; m = 1/2
Answer D
Aljalal-Phys101-Sept 2007-Ch1-page 7
1-7 Density
M1-062
From the fact that the average density of the Earth is 5.50
g/cm3 and its mean radius is 6.37 ×106 m, the mass of the
Earth is:
A) 7.01 × 1017 kg
B) 3.98 × 1021 kg
C) 5.95 × 1024 kg
D) 2. 80 ×1018 kg
E) 5.50 × 1023 kg
Answer C
Aljalal-Phys101-Sept 2007-Ch1-page 8
1-7 Density
M1-061
An aluminum cylinder of density 2.70 g/cm3, a radius of 2.30
cm, and a height of 1.40 m has the mass of:
A) 25.0 kg
B) 45.1 kg
C) 13.8 kg
D) 8.50 kg
E) 6.28 kg
Answer E
Aljalal-Phys101-Sept 2007-Ch1-page 9
1-7 Density
M1-052
A nucleus of volume 3.4 x 103 fm3 and mass of 1.0x 102 u
has a density of:
(1 fm = 10-15 m, 1 u = 1.7 x 10-27 kg)
A) 5.0 × 1016 kg/m3
B) 1.0 × 103 kg/m3
C) 3.4 × 1014 kg/m3
D) 12 × 103 kg/m3
E) 3.6 × 1013 kg/m3
Answer A
Aljalal-Phys101-Sept 2007-Ch1-page 10
1-7 Density
M1-042
A cylindrical can, 6.00 inches high and 3.00 inches in
diameter is filled with water. Density of water is 1.00 g/cm3.
What is the mass of water in the can in gram ?
(1 inch = 2.54 cm) .
A) 277 g
B) 695 g
C) 182 g
D) 107 g
E) 2780 g
Answer B
Aljalal-Phys101-Sept 2007-Ch1-page 11
1-7 Density
M1-041
A drop of oil (mass = 0.90 milligram and density = 918 kg/m3)
spreads out on a surface and forms a circular thin film of
radius = 41.8 cm and thickness h. Find h in nano meter (nm).
(1 nano = 10-9)
A) 0.60 nm
B) 0.00060 nm
C) 0.15 nm
D) 1.8 nm
E) 0.030 nm
Answer D
