What does the absolute uncertainty equal for a metre rule graduated in millimetres?
a
1 cm
b
0.01 cm
c
0.1 cm
d
0.05 cm
2
What is the term for the smallest measurable value of an instrument?
a
Least count
b
Calibration unit
c
Fluctuation scale
d
Measurement base
3
What is used to estimate the precision of a digital measurement?
a
Calibration
b
Full range
c
Last digit
d
Measurement mean
4
What is the fractional uncertainty formula?
a
Absolute/Measured
b
Measured/Absolute
c
Measured × Absolute
d
Measured + Absolute
5
What is the uncertainty if both ends are ±0.05 cm apart?
a
± 0.05 cm
b
± 0.10 cm
c
± 0.50 cm
d
± 1.00 cm
6
What does the reading 23.5 ± 0.1 cm mean?
a
Length is exactly 23.5 cm
b
Random guess
c
Rounded average
d
Range between 23.4 cm and 23.6 cm
7
What causes fluctuations in digital scales?
a
Electric current
b
Air currents
c
Temperature
d
Humidity
8
Measurement of length requires what tool?
a
Clock
b
Thermometer
c
Measuring instrument
d
Digital screen
9
Why is digital error reflected in instruments?
a
Human error
b
Graduations limit
c
Light fluctuation
d
Electrical error
10
The length of a steel pipe is in between 0.7 m to 0.8 m. Identify from the following, the appropriate instrument to be used for an accuracy of 0.001 m:
a
A micrometer screw gauge
b
A metre rule
c
A ten metres measuring tape
d
A Vernier Callipers
11
The diameter of a steel ball is measured using a Vernier callipers and its reading is shown in the figure. What is the diameter of the steel ball?
a
1.30 cm
b
1.39 cm
c
1.40 cm
d
1.31 cm
12
The figure shows the reading on a micrometer screw gauge used to measure diameter of a thin rod. One complete turn of the thimble is 0.50 mm and there are 50 lines on the circular scale. The diameter of the rod is:
a
3.67 mm
b
3.17 mm
c
4.17 mm
d
4.20 mm
13
The following figures are of the same Vernier calipers. Figure (1) shows the reading when the jaws are closed while Fig. (2) shows the reading when a solid cylinder is placed between the jaws. The length of the cylinder is:
a
3.26 cm
b
3.30 cm
c
3.34 cm
d
4.20 cm
14
The least count of an instrument determines:
a
Precision of a measurement
b
Accuracy of a measurement
c
Fractional uncertainty of a measurement
d
Percentage uncertainty of a measurement
15
A measuring tape has been graduated with a minimum scale division of 0.2 cm. The allowed reading using this tape may be:
