Physical Quantities, Units and Measurement

Physical Quantities, Units and Measurement (O Level)

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Question 1
A vernier caliper is precise to ___ ?
A
1mm
B
0.1mm
C
0.01mm
D
0.001mm
Question 2
A micrometer screw gauge is precise to ___ ?
A
0.1mm
B
0.01mm
C
0.005mm
D
0.05mm
Question 3
Which of the following is accurate but not precise?
A
A
B
B
C
C
D
D
Question 4
Which of the following is precise, but not accurate?
A
A
B
B
C
C
D
D
Question 5
What is the zero error shown below?
A
0.3 mm
B
0.03 mm
C
-0.3 mm
D
-0.03 mm
Question 5 Explanation: 
The Vernier Caliper is precise to 0.1 mm. When the error reads a positive number, it is known as a positive error.
Question 6
This is the final reading on a vernier caliper with a zero error of -0.3 mm. What is the actual measurement?
A
9.99 cm
B
9.72 cm
C
10.05 cm
D
10.32 cm
Question 6 Explanation: 
Formula for measurements with zero error: Final reading - Zero error = Actual reading. Final reading is 10.02 cm or 100.2 mm. Since Zero error is -0.3 mm, Final reading = 100.2 mm - (-0.3 mm) = 100.5 mm or 10.05 cm.
Question 7
What is the zero error shown below?  
A
0.3 mm
B
-0.3 mm
C
0.7 mm
D
-0.7 mm
Question 7 Explanation: 
Since the vernier scale is behind the main scale, zero error is negative. When zero error is negative, you have to read from the back of the vernier scale, getting a zero error of -0.7 mm instead of -0.3 mm.
Question 8
What is the zero error as shown below?
A
0.3 mm
B
0.03 mm
C
-0.3 mm
D
-0.03 mm
Question 9
What is the zero error as shown below?
A
0.048 mm
B
0.48 mm
C
-0.2 mm
D
-0.02 mm
Question 9 Explanation: 
The screw has been closed past the 0 cm mark. Hence, the zero error is negative. Since it has gone past the 0 cm mark by 0.02 mm, zero error is -0.02 mm.
Question 10
What is the reading shown below?
A
9.48 cm
B
9.48 mm
C
9.98 cm
D
9.98 mm
Question 11
What is the reading as shown below?  
A
9.48 cm
B
9.48 mm
C
9.98 cm
D
9.98 mm
Question 11 Explanation: 
The 9.50 mm mark has been crossed. You need to add 0.48 mm to 9.50 mm to get the answer 9.98 mm.
Question 12
A micrometer with a -0.03 mm zero error is used to get this final reading below. What is the actual measurement?
A
2.41 mm
B
2.35 mm
C
2.91 mm
D
2.85 mm
Question 12 Explanation: 
Formula for measurements with zero error: Final reading - Zero error = Actual reading. Final reading is 2.88 mm. Since Zero error is -0.03 mm, Final reading = 2.88 - (-0.03 ) = 2.91 mm
Question 13
A car travels 8 km southwards, followed by 6 km southwards. What is the magnitude of its distance and displacement?
A
Distance: 14 km Displacement: 14 km
B
Distance: 14 km Displacement: 10 km
C
Distance: 10 km Displacement: 14 km
D
Distance: 10 km Displacement: 10 km
Question 14
A car travels 8 km southwards, followed by 6 km northwards. What is the magnitude of its distance and displacement?
A
Distance: 14 km Displacement: 14 km
B
Distance: 14 km Displacement: 10 km
C
Distance: 14 km Displacement: 2 km
D
Distance: 10 km Displacement: 14 km
Question 15
A car travels 8 km southwards, followed by 6 km eastwards. What is the magnitude of its distance and displacement?
A
Distance: 14 km Displacement: 14 km
B
Distance: 14 km Displacement: 10 km
C
Distance: 10 km Displacement: 14 km
D
Distance: 10 km Displacement: 10 km
Question 16
A car travels 8 km southwards, followed by 6 km eastwards. What is its southward displacement?
A
14 km
B
10 km
C
8 km
D
2 km
Question 16 Explanation: 
The only direction to consider is south, as the question asks. Travelling East or West do not change the southward displacement. Only travelling North or South do.
Question 17
A car travels 8 km to the west, 6 km to the north, 8 km to the east and 6 km to the south. What is its displacement?
A
0 km
B
6 km
C
14 km
D
28 km
Question 17 Explanation: 
The car starts and ends at the same point. The straight line distance between the start and end point is 0 km.
Question 18
The dimensions of a small book is measured as 73.2 mm, 37.2 mm, 2.37 mm. What measuring tool could have been used to obtain these readings?
A
Measuring tape
B
Micrometer Screw Gauge
C
Vernier Caliper
D
Meter Rule
Question 18 Explanation: 
Only a Vernier Caliper has the precision of 0.1 mm.
Question 19
23 m/s = _____ km/h
A
82.8
B
1.38
C
828
D
\[6.39 \times {10^{ - 6}}\]
Question 19 Explanation: 
23 m/s = 0.023 km/s = (0.023 x 60) km/min = [(0.023 x 60) x 60] km/h = 82 km/h
Question 20
A car travels 8 km southwards, followed by 6 km eastwards. What is the magnitude of its distance and displacement?
A
Distance: 14 km Displacement: 14 km
B
Distance: 14 km Displacement: 10 km
C
Distance: 10 km Displacement: 14 km
D
Distance: 10 km Displacement: 10 km
Question 21
Which of the following is equivalent to the units of force?
A
$kgm{s^{ - 1}}$
B
$kgm{s^{ - 2}}$
C
$kgm{s^2}$
D
$kgms$
Question 21 Explanation: 
$\begin{array}{l} F = ma\\ N = kg(m{s^{ - 2}}) \end{array}$
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