physics cba1 Flashcards
What are two types of errors in measurement?
- Random errors
- Systematic errors
How can random errors be minimized?
By taking several readings and calculating the average.
What characterizes systematic errors?
They are constant and predictable.
How can systematic errors be avoided?
By calibrating the equipment.
What is the smallest unit an instrument can measure called?
Precision.
What instrument can measure lengths of up to 1m?
Metre rule.
What is the purpose of a measuring tape?
To measure lengths of up to several metres and measure straight distances or curved surfaces.
What is a digital vernier calliper used for?
To measure internal and external diameters of an object accurately.
What is the function of the tail of the callipers?
Used to measure the depth of an object.
What is a digital micrometer screw gauge used for?
To measure objects too small to be measured using digital callipers.
What is the practical unit for measuring length equivalent to 10^-10 m?
1 angstrom.
What is 1 fermi in meters?
10^-15 m.
What are two instruments used for measuring mass?
- Weighing scale
- Electronic balance
What is the mass equivalent of 1 metric ton?
1000 kg.
How much does 1 pound weigh in kilograms?
0.454 kg.
What is the precision of a stopwatch?
0.1s.
What is the precision of a digital stopwatch?
To 2 decimal places of a second.
What unit is used to measure electric current?
Ampere (A).
What is the SI unit for temperature?
Kelvin (K).
What is the prefix for 10^9?
Giga (G).
What is the prefix for 10^-3?
Milli (m).
What is the measuring tape’s precision?
To the nearest 0.1cm / 1mm with a range of 0 to several m.
What is the range of a digital calliper?
0 to 15cm.
What is the precision of a digital micrometer screw gauge?
To the nearest 0.0001 / 0.001mm.
