Pakistan MCQs

Perpendicular vector components form a right triangle.
The resultant magnitude is found from the sum of squared components.

Slope gives change in velocity per unit time.
That is acceleration.

One kilometre equals 1,000 metres.
Therefore 3.5 km = 3.5×1,000 = 3,500 m.

Integrating velocity over time gives displacement.
Areas below the time axis count as negative displacement.

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

Uniform acceleration means velocity changes by equal amounts in equal times.
The standard kinematic equations apply.

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

Inertia is related to mass.
Greater mass means greater resistance to acceleration.

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.