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Answer to Question #61527 in Other Physics for na

Question #61527

3 Which of these is not a useful precaution in an electrical experiment?
key should be removed between readings to avoid battery run-down
jockeys should be dragged on resistance wires
the connections in the circuit should be tight
readings should be recorded as soon as they are obtained
4 Which of the following is NOT true about a rheostat?
It is a constant current instrument
It is a resistor with moving contact
It is used for varying the current in a circuit
It is used for varying the resistance in a circuit
5 In an experiment, potential difference is plotted on the vertical axis and current on the horizontal axis. The slope of the graph represents
resistivity
conductivity
resistance
conductance
6 For a metallic conductor, Ohm's law holds provided
potential difference varies
current remains constant
temperature remains constant
potential difference remains constant

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