Which one of these statements is true of the ohmmeter?Select one:a.All these statements are trueb.It is used to measure resistance of a single resistor in a network without removing the resistor from the circuit.c.It should be stored with the selector switch in the resistance moded.It displays a resistance of zero if the leads touch each other, and an infinite reading if there is no connection at alle.It is used to measure resistance in a circuit only if the circuit is powered by low-voltage batteries.

A resistor is described as being ‘ohmic’.  Which of the following statements does NOT apply to it?When the potential difference across the resistor doubles, the current through it will double too (so long as the temperature and other physical conditions do not change)The current through the resistor is inversely proportional to the potential difference across itA graph of I against V for the component will be a straight line through the originWhen the p.d. across the component is increased from 2 to 4 V, the current through it will increase from 1.2 to 2.4 A2A variable resistor is set to a value of 5 ohms, and a current-voltage (I-V) graph (with I on the y-axis and V on the x-axis) is plotted for it.  Its resistance is then doubled to 10 ohms.  What effect will this have on its I-V graph?It will have no effect on its I-V graphThe slope (gradient) of the graph will increaseThe entire graph will move upwardsThe slope (gradient) of the graph will decrease3If a current of 4 A flows through a motor when a potential difference of 12 V is applied across it, calculate its resistance.0.33 Ω3 Ω48 Ω6 Ω4A student wishes to measure the resistance of a filament bulb.  Which of the following should they do?Connect an ammeter and a voltmeter, both in seriesConnect a voltmeter in parallel and an ammeter in seriesConnect a voltmeter in series and an ammeter in parallelConnect an ammeter and a voltmeter, both in parallel5Which of the following does NOT require the use of an LDR?A smartphone screen with an automatic brightness settingA thermostatThe automatic headlights on a carThe shutter of a digital camera6A student connects a cell, a filament bulb and a diode in series to one another.  The diode is forward-biased.  What will happen to the bulb when the leads attached to the diode are swapped around?It will flash on and offIt will get brighterNothing (its brightness will not change)It will turn off

53-Ammeter is used to measure---------while Ohmmeter is used to measure-----------1 pointcurrent- resistanceresistance- currentvolts - current

Which of the following has the least resistence?

Students are provided with an unknown resistor that has a constant resistance for all potential differences. The students are instructed to plot an I-V graph for the resistor.Which, if any, of the following are true for I-V graphs of ohmic devices?Amust be a horizontal lineBmust pass through the originCmust not pass through the originDnone of the above

Four unequal resistors are connected in a series circuit. Which one of the following statements is correct about this circuit?Group of answer choicesThe total resistance is equal to any one of the resistances.The total resistance is less than the smallest resistance.The total resistance is less than the largest resistance.The total resistance is more than the largest resistance.