### Topic 1-Practice Questions

```Topic 1: Physical Measurements
Practice Questions
Practice Questions
1. Convert the following into metres (m) and write in
standard form:
a) Distance from London to New York = 5585 km
b) Height of Einstein was 175 cm
c) Thickness of a human hair = 25.4 μm
d) Distance to the edge of the universe = 100,000
million million million km
a) 5.585 x 106 m
c) 2.54 x 10-5 m
b) 1.75 m
d) 1026 m
Practice Questions
2. Convert the following times into seconds (s) and write
in standard form:
a) 85 years, how long Newton lived
b) 2.5 ms, the time taken for a mosquito’s wing to
go up and down
c) 4 days, the time it took to travel to the moon
d) 2 hours, 52 min 59 s, the time time for the
Concord to fly from London to New York
a) 2.69 x 109 s
c) 3.46 x 105 s
b) 2.5 x 10-3 s
d) 1.0379 x 104 s
Practice Questions
3. Convert the following masses to kilograms (kg) and
write in the standard form:
a) The mass of an apple = 200 g
b) The mass of a grain of sand = 0.00001 g
c) The mass of a family car = 2 tonnes
a) 0.2 kg
b) 1 x 10-8 kg
c) 2 x 103 kg
Practice Questions
4. Calculate the volume of a room of length 5 m, width 10 m
and height 3m.
5. What is the volume of a human hair with length 20 cm?
6. Calculate the volume of the Earth (radius = 6.378 x 106
m).
4) 150 m3
5) 1.0 x 10-10 m3
6) 1.09 x 1021 m3
Practice Questions
7. Calculate the mass of the air in the previous room. The
density of air is 1.2 kg m-3.
8. Calculate the mass of a gold bar of length 30 cm, width 15
cm, height 10 cm and density 1.93 x 104 kg m-3.
9. The Earth has a mass of 5.97 x 1024 kg, calculate its
average density.
7) 180 kg
8) 86.85 kg
9) 5.48 x 103 kg m-3
Practice Questions
10. To determine the area of an object, two
lengths l1 and l2 are measured.
l1 = 10.25 +/- 0.05 cm
l2 = 15.45 +/-0.05 cm.
Calculate:
a) the % uncertainty in l1
b) the % uncertainty in l2
c) the area of the object
d) the % uncertainty in the area
a) 0.5 %
c) 158.36 cm2
b) 0.3 %
d) 0.8 %
Practice Questions
11. A boat travels 4 km west followed by 8 km north. What is the
resultant displacement?
12. A plane flies 100 km north then changes course to fly 50 km
east. What is the resultant displacement?
13. If a boat travels 10 km in a direction 30° east of north, how far
north has it traveled?
14. On his way to the South Pole , Amundsen traveled 8 km in a
direction that was 20° west if south. What was his displacement
south?
15. A mountaineer climbs 500 m up a slope that is inclined at an
angle 60° to the horizontal. How high has he climbed?
11) 8.94 km, 26.6°
14) 7.52 km
13) 8.66 km
12) 112 km, 26.6°
15) 433 km
Practice Questions
a) half area of graph paper used;
axes labels and units included;
scale;
data points;
b) absolute uncertainty in Q at 10.0 V = +/- 3nC;
absolute uncertainty in Q at 50.0 V = +/- 18nC;
correct placing on graph;
c) from top of error bar at (50,180) to bottom of error
bar (10,30);
Use of at least half of the line or algebraic indication;
value = 4.3 or 4.3 x 10-9;
d) CV-1
e) recognize that m = ε°A / d;
therefore ε° = dm / A;
(0.51 x 10-3)(4.3 x 10-9) / 0.15;
1.5 x 10-11 CV-1m-1;
Practice Questions
2) C
3) A
4) C
5) C
Practice Questions
6) C
7) D
8) B
9) C
```