Current electricity practice · Mixed difficulty

Material that is widely used to make wire bound standard resistors is

Masses of the three wires of same material are in the ratio of $1:2:3$ and their lengths in the ratio of $3:2:1$. Electrical resistance of these wires will be in the ratio of

Assertion: When Wheatstone bridge is balanced, the current through the cell depends on the resistance of galvanometer.
Reason: In the balanced condition, current through the galvanometer is very high.

The length of a conductor is doubled and its radius is halved, its specific resistance is

For a thermocouple, the inversion temperature is $600\,^\circ C$  and the neutral temperature is $320\,^\circ C$. Find the temperature of the cold junction?

Twelve wires of equal resistance $R$ are connected to form a cube. The effective resistance between two opposite diagonal ends will be

The heat Produced in a given resistor in a given time by the sinusoidal current $I_0 \sin$ $\omega \mathrm{t}$ will be the same as that by a steady current of magnitude

Five cells each of emf $E$ and internal resistance $r$ send the same amount of current through an external resistance $R$ whether the cells are connected in parallel or in series. Then the ratio $\left(\frac{R}{r}\right)$ is

Thermoelectric constant of a thermocouple are $\alpha$ and $\beta .$. Thermoelectric power at inversion temperature is

In a simple metre-bridge circuit, the gaps are bridge by coils $P$ and $Q$ having the smaller resistance. A balance is obtained when the jockey key makes contact at a point of the bridge wire 40 cm from the $P$ end. On shunting the coil $Q$ with a resistance of $50 \Omega,$ the balance point is moved through 10 cm. The resistance $P$ and $Q$ are

Assertion (A) : If potential difference across two points is zero, current between these two points should be zero.

Reason (R): Current passing from a resistor $I=\frac{V}{R}$

A certain electrical conductor has a square cross-section, $\mathrm{2}\mathrm{.0}\,\,\mathrm{mm}$ on side, and is $\mathrm{12 m}$ long. The resistance between its ends is $0.072\,\,\mathrm{\Omega }$. The resistivity of its material is equal to

Statement-1: If a wire is stretched to increase its length $n$ times then its resistance also become $n$ time.
Statement-2: Resistance of the wire is directly proportional to its length.

A battery of emf $\mathrm{2}\,\,\mathrm{V}$ and internal resistance $0.1\,\,\Omega$ is being charged by a current of $\mathrm{5}\,\,\mathrm{A}$. the potential difference between the terminals of the battery is

In a Wheatstone bridge, $P = 90\,\,\mathrm{\Omega },\,\,Q = 110\,\,\mathrm{\Omega },\,\,R = 40\,\,\mathrm{\Omega }\,\,\mathrm{and}\,\,S = 60\,\,\mathrm{\Omega }$ and a cell of $\mathrm{4}\,\,\mathrm{V}$ emf. Then the potential difference between the diagonal along which a galvanometer is connected is

A wire is cut into 4 pieces, which are put together by sides to obtain one conductor. If the original resistance of wire was $R$, the resistance of the buridle will be

$Watt - hour$ meter measures

Statement-1: When a wire is stretched so that its diameter is halved then its resistance become 16 times.
Statement-2: Resistance of wire decrease with increase in length.