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Length and Measurement Quiz

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Questions and Answers

What is the percentage discrepancy formula for measured (M) and true (V) values?

$rac{(V-M)}{V} imes 100 ext{%}$

$rac{(M-V)}{V} imes 100 ext{%}$ (correct)

$rac{(V-M)}{M} imes 100 ext{%}$

$rac{(M-V)}{M} imes 100 ext{%}$

If you measure the radius of a wheel to be 4.16 cm, what should be the correct representation of the diameter?

8.32 cm (correct)

4.16 cm

8 cm

4.08 cm

What are the base SI units of Coulomb's constant (k) in Coulomb's law?

$C/Nm^2$

$N/C^2$

$Nm^2/C^2$ (correct)

$C^2/Nm^2$

Express volts (V) in terms of the base SI units.

<p>$kg \cdot m^2 / A \cdot s^3$</p> Signup and view all the answers

What is the expression for capacitance C in terms of charge Q and potential difference V?

<p>$C = Q/V$; x=1, y=1</p> Signup and view all the answers

Study Notes

Formulae and Units

The percentage discrepancy formula is ((M - V) / V) × 100, where M is the measured value and V is the true value.

Representation of Measurements

When measuring the radius of a wheel, the correct representation of the diameter is 2 × (measured radius) = 2 × 4.16 cm = 8.32 cm.

Coulomb's Law

The base SI units of Coulomb's constant (k) are N m² C⁻².

Electric Units

Volts (V) can be expressed in terms of base SI units as kg m² s⁻³ A⁻¹.

Capacitance

Capacitance (C) is expressed in terms of charge (Q) and potential difference (V) as C = Q / V.

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Description

Test your ability to draw and measure lengths accurately without a ruler. Compare your drawn lengths to the true values using a ruler. Also, practice converting between radius and diameter measurements.