USAT Physics MCQs

Both sides of a valid physical equation must have the same dimensions.
Dimensional analysis can reveal inconsistent formulas.

The newton is derived from base units as kg·m/s².
Metre, kilogram, and second are base units.

Precision describes repeatability.
Measurements can be precise without being accurate.

The metre is the SI base unit of length.
Other metric length units are derived from it using prefixes.

Both sides of a valid physical equation must have the same dimensions.
Dimensional analysis can reveal inconsistent formulas.

The newton is derived from base units as kg·m/s².
Metre, kilogram, and second are base units.

The metre is the SI base unit of length.
Other metric length units are derived from it using prefixes.

The kilogram is the SI base unit of mass.
The gram is one-thousandth of a kilogram.

The second is the SI base unit of time.
Minutes and hours are accepted non-SI units derived from it.

A scalar has magnitude only.
Speed has no associated direction.

A vector has both magnitude and direction.
Acceleration describes the rate and direction of velocity change.