Voltmeter - Practice Questions & MCQ

The AC voltage across a resistance can be measured using a :

To verify Ohm’s law, a student connects the voltmeter across the battery as shown in the figure. The measured voltage is plotted as a function of the current and the following graph is obtained. If Vo is almost zero, then identify the correct statement.

The reading in the ideal voltmeter (V) shown in the given circuit diagram is:

A cell of emf $
90 \mathrm{~V}
$ is connected across series combination of two resistors each of $
100 \Omega
$ resistance. A voltmeter of resistance $
400 \Omega
$ is used to measure the potential difference across each resistor. The reading of the voltmeter will be:

The net resistance of a voltmeter should be large to ensure that

In the circuit shown, below a student performing Ohm's law experiment accidentally puts the voltmeter and ammeter as shown in the circuit below, the reading in the voltmeter will be close to:

In a 20 m deep lake, the bottom is at 4°C. The air temperature is constant –10°C. The thermal conductivity of ice is 4 times that of water. Neglecting expansion of water at freezing. The maximum thickness of the ice will be: