PIEAS SSC Physics MCQs

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.

One metre equals 100 centimetres.
Therefore 250 cm ÷ 100 = 2.5 m.

Percentage uncertainty is absolute uncertainty divided by measured value times 100.
0.2/10.0×100 = 2%.

Percentage error is |48-50|/50×100.
The result is 2/50×100 = 4%.

Move the decimal four places to the right to obtain 7.2.
Therefore the exponent is -4.

Use the Pythagorean theorem for perpendicular components.
Magnitude = √(3²+4²)=5.

The x-component is A cosθ.
10 cos60° = 10×0.5 = 5.

The y-component is A sinθ.
10 sin30° = 10×0.5 = 5.