Practice Pakistan questions with answers and explanations.
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Distance is a scalar and depends on the actual path.
It is always nonnegative.
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Average speed uses total path length.
It does not depend on direction.
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Leading zeros are not significant, but trailing zeros after a decimal are.
Thus 4, 5, and the final zero are significant.
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Vector addition replaces multiple vectors with an equivalent single vector.
Its direction and magnitude depend on the original vectors.
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Perpendicular vector components form a right triangle.
The resultant magnitude is found from the sum of squared components.
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Let the son's age be x and father's age 3x.
Then 3x + 10 = 2(x + 10), giving x = 10.
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One kilometre equals 1,000 metres.
Therefore 3.5 km = 3.5×1,000 = 3,500 m.
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Let tens digit be a and units digit b; then a + b = 11 and 9(b - a) = 27.
So b - a = 3, giving a = 4 and b = 7.
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One metre equals 100 centimetres.
Therefore 250 cm ÷ 100 = 2.5 m.
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The metre is the SI base unit of length.
Other metric length units are derived from it using prefixes.
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Percentage uncertainty is absolute uncertainty divided by measured value times 100.
0.2/10.0×100 = 2%.
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The kilogram is the SI base unit of mass.
The gram is one-thousandth of a kilogram.
