NET Physics MCQs

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.

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.

Accuracy describes agreement with the true or accepted value.
Systematic error can reduce accuracy.

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

Systematic errors often arise from calibration or method bias.
Repeated measurements do not automatically remove them.

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

Random errors cause scatter around a central value.
Repeated measurements and averaging can reduce their effect.

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

Leading zeros are not significant, but trailing zeros after a decimal are.
Thus 4, 5, and the final zero are significant.