Electricity Questions

A moving coil galvanometer has $150$ equal divisions. Its current sensitivity is $10$ divisions per milliampere and voltage sensitivity is $2$ divisions per millivolt. In order that each division reads $1\text{ volt}$, the resistance in ohms needed to be connected in series with the coil will be:

Two voltameters one of copper and another of silver, are joined in parallel. When a total charge $q$ flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $z_1$ and $z_2$ respectively the charge which flows through the silver voltameter is:

In the circuit, the galvanometer $G$ shows zero deflection. If the batteries $A$ and $B$ have negligible internal resistance, the value of the resistor $R$ will be:

Two sources of equal emf are connected to an external resistance $R$. The internal resistance of the two sources are $R_1$ and $R_2$ ($R_2>R_1$). If the potential difference across the source having internal resistance $R_2$ is zero, then:

A fully charged capacitor has a capacitance ‘$C$ ’. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity ‘$s$ ’ and mass ‘$m$ ’. If the temperature of the block is raised by ‘$\Delta T$ ’, the potential difference $V$ across the capacitance is:

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be:

A parallel plate capacitor is made by stacking $n$ equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is $C$ then the resultant capacitance is:

An energy source will supply a constant current into the load if its internal resistance is:

A circuit has a resistance of $12\Omega$ and an impedance of $15\Omega$. The power factor of the circuit will be:

The phase difference between the alternating current and emf is $\pi /2$. Which of the following cannot be the constituent of the circuit?

In a potentiometer experiment the balancing with a cell is at length $240\text{ cm}$. On shunting the cell with a resistance of $2\Omega$ the balancing length becomes $120\text{ cm}$. The internal resistance of the cell is:

The resistance of hot tungsten filament is about $10$ times the cold resistance. What will be the resistance of $100\text{ W}$ and $200\text{ V}$ lamp when not in use?