NEET Physics Current Electricity Metrebridge MCQs

A metre bridge setup uses a standard resistance of $10\Omega$. A resistance wire of unknown value and uniform cross-section is connected across the left gap. The null point is obtained at $60\,cm$ from the left end. If the radius of the unknown wire is doubled without changing its length or resistivity, the new null point will be at:

In a metre bridge experiment, the null point is found at $40\,cm$ from the left end. A $12\Omega$ resistor is connected in parallel with the unknown resistance and the null point shifts to $60\,cm$. What is the value of the unknown resistance?

In a metre bridge experiment, null point is obtained at $l$ cm from the left end using resistance $R$ and $S$. If the temperature of $R$ increases, which of the following correctly describes the shift in the null point?

Two resistances $R_1$ and $R_2$ are connected in the left and right gaps of a metre bridge, respectively. The null point is at $l_1$. If a resistance $X$ is connected in series with $R_1$, the null point shifts to $l_2$. Which expression correctly represents $X$?

A metre bridge setup uses a standard resistance of $10 \Omega$ and an unknown resistance. The null point is obtained at $40 ext{cm}$ from the left end. When a shunt of $10 \Omega$ is connected across the standard resistance, the null point shifts by $10 ext{cm}$. If the shunt is now connected across the unknown resistance, the new null point from the left end will be:

In a metre bridge experiment, the null point is obtained at 40 cm from the left end. If a resistance of 10 $\Omega$ is connected in series with the resistance in the left gap, the null point shifts to 50 cm. The resistance in the left gap before the 10 $\Omega$ resistor was added is:

A metre bridge is balanced with a known resistance of 20 $\Omega$ in the right gap and an unknown resistance in the left gap. If the balance point is at 60 cm from the left end, what is the value of the unknown resistance?

The null point in a metre bridge is found to be at 45 cm. If the resistance in the left gap is shunted by a 5 $\Omega$ resistor, the null point shifts to 35 cm. What is the value of the resistance initially in the left gap?

Which of the following factors does NOT affect the accuracy of a metre bridge experiment?

In a metre bridge experiment, the null point is obtained at the center of the wire. If a resistance of 5 $\Omega$ is connected in parallel with the resistance in the right gap, where will the null point shift to?