PIEAS Physics MCQs

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.

Vectors in the same direction add directly.
The resultant is 12+7 = 19 N.

Opposite collinear vectors subtract in magnitude.
The resultant magnitude is |12-7| = 5 N.

Displacement is a vector from initial to final position.
It can be zero even when distance traveled is not zero.

Distance is a scalar and depends on the actual path.
It is always nonnegative.

Average speed uses total path length.
It does not depend on direction.

Average velocity is a vector based on net displacement.
A round trip can have zero average velocity.

Slope gives change in displacement per unit time.
That is the definition of velocity.