Physical Quantities and Measurement

Definition of physical quantity.

• Quantity that cannot be defined in term of other physical quantity.

• Quantity that can be measured.

• Quantity that can be derived from combination of base quantities through multiplication, division or both.

• Quantity which has magnitude only.

Definition of base quantity.

• Quantity that cannot be defined in term of other physical quantity.

• Quantity that can be measured.

• Quantity that can be derived from combination of base quantities through multiplication, division or both.

• Quantity which has magnitude only.

Definition of scalar quantity.

• Quantity that cannot be defined in term of other physical quantity.

• Quantity that can be measured.

• Quantity that can be derived from combination of base quantities through multiplication, division or both.

• Quantity which has magnitude only.

Definition of derived quantity.

• Quantity that cannot be defined in term of other physical quantity.

• Quantity that can be measured.

• Quantity that can be derived from combination of base quantities through multiplication, division or both.

• Quantity which has magnitude only.

Definition of vector quantity.

• Quantity that cannot be defined in term of other physical quantity.

• Quantity which has both magnitude and direction

• Quantity that can be derived from combination of base quantities through multiplication, division or both.

• Quantity which has magnitude only.

.................. is the degree of how close a measurement is from the actual value.

• Sensitivity

• Consistency

• Accuracy

• Error

..................the ability to give same readings when the same physical quantities is measures more than once.

• Sensitivity

• Consistency

• Accuracy

• Error

..................the ability to detect a small change in the quantity which it measures.

• Sensitivity

• Consistency

• Accuracy

• Error

Which of the following is NOT an example of random error

• parallax error

• error due to change of temperature

• zero error

• error due to miscount

Which of the following is an example of systematic error

• zero error

• error due to change of temperature

• parallax error

• error due to miscount