Assertion: In a metre bridge, the length of the wire is $1 \mathrm{m}$.

Reason: Greater the length of the wire, the better is the accuracy.

Assertion: A slide wire bridge is also called a metre bridge.

Reason: It is because the length of wire in a slide wire bridge is one metre.

In a Wheatstone's metrebridge, the null point is obtained at the middle point of the wire. If in one gap the resistance is $10 \mathrm{\Omega }$, then the value of resistance in the other gap is 

In a metrebridge, the balancing length from the left end (standard resistance of one $\mathrm{\Omega }$ is in the right gap) is found to be $20 \mathrm{cm}$. The value of the unknown resistance is 

In metre bridge experiment, with a standard resistance in the right gap and a resistance coil dipped in water (in a beaker) in the left gap, the balancing length obtained is $1$. If the temperature of water is increased, the new balancing 

Resistances in the two gaps of a metre bridge are $10 \mathrm{ohm}$ and $30 \mathrm{ohm}$ respectively. If the resistances are interchanged, the balance point (in $\mathrm{cm}$) shifts by

The resistances in the left and right gap of a meter bridge are $20 \mathrm{\Omega }$ and $30 \mathrm{\Omega }$ respectively. When the resistance in the left gap is reduced to half its value, the balance point shifts by 

An unknown resistance $R_1$ is connected in series with a resistance of $10 \mathrm{\Omega }$. This combination is connected to one gap of a metre bridge, while a resistance $R_2$ is connected in the other gap. The balance point is at $50 \mathrm{cm}$. Now, when the $10 \mathrm{\Omega }$ resistance is removed the balance point shifts to $40 \mathrm{cm}$. The value of $R_1$ is (in $\mathrm{\Omega }$) 

Two unknown resistances are connected in two gaps of a meter-bridge. The null point is obtained at $40 \mathrm{cm}$ from left end. A $30 \mathrm{\Omega }$ resistance is connected in series with the smaller of the two resistances, the null point shifts by $20 \mathrm{cm}$ to the right end. The value of smaller resistance in $\mathrm{\Omega }$ is