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Q1.

A voltmeter with internal resistance of $x\ \Omega$ can be used to measure upto $20$ V. In order to increase its measuring range to $30$ V, the required modification is to _____.

(A)

connect resistor of $\dfrac{x}{2}\ \Omega$, in series with voltmeter.

(B)

connect resistor of $\dfrac{x}{2}\ \Omega$, in parallel to voltmeter.

(C)

connect a resistor of $x\ \Omega$ in series with voltmeter.

(D)

connect resistor of $2x\ \Omega$ in parallel to voltmeter.

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Q2.

Which one of the following is not a measurable quantity?

(A)

Voltage

(B)

Resistance

(C)

Displacement current

(D)

Voltage difference

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