Physics 1 Marks Question

The potential difference between the terminals of the cell is known as electromotive force. When cell is closed, then potential difference across the terminals of the cell is known as terminal voltage.

The obstruction offered in the flow of charge by the ions of the electrolytes used in the cell is known as internal resistance of the cell.

It is because the motion of ions inside the cell is obstructed by the collisions with the atoms of the electrolyte.

Junction

All the four resistances joined in its four arms should be of same order.

First law on the conservation of law and second law on the conservation of energy.

In conductor, the magnitude of current will decrease but in semiconductor it will increase.

When cell is in open circuit or when no current is flowing from the cell in the external circuit.

The internal resistance of an accumulator cell is less than one ohm, so it cannot be determined with the help of Wheatstone bridge.

It is equal to the sum of potential differences produced across the ends of resistors joined in the circuit.

When there is no deflection in cell and galvanometer both on closing the keys of both that is no current flows in its arm, it is said to be balanced.

Yes

No, because internal resistance of car batteries is very less.

In complex electric circuits where more than one electromotive force sources are present, Ohm's law cannot be applied. In such circuits, only Kirchhoff's laws can be applied.

Such a combination of cells in which like terminals of all cells are joined together is known as parallel combination of cells.

When the internal resistance of a battery is zero or it is in open circuit which means no current is taken from it.

With increase in temperature, due to increase in number of ions in electrolyte and their mobility, its specific conductance will increase due to decrease in its resistivity.

Both relaxation time and drift velocity increases on increasing the temperature.

If one coulomb of charge passes through any conductor in one second, then magnitude of current flowing in the conductor is one ampere. 1 A = 1 coulomb/1 second.

It is obtained in the form of a straight line.

Drift velocity is inversely proportional to applied potential difference on the conducting rod and drift velocity of electrons in the conductor does not depends on length of the conductor.

Magnitude of relaxation time depends on the nature of the conducting substance and it does not depend on the magnitude of electric field.

Resistance of a conductor of length 1 m and area of cross-section 1 m² is equal to its resistivity. Its unit is ohm metre or ohm cm.

(1) decreases (ii) increases.

Physical conditions should remain constant (temperature, length, area of cross-section).

Value of total resistance decreases.

Due to small change in temperature, there is no change in thermal expansion but for more change in temperature of resistance, ratio of length and area of crosssection will decrease which will affect the resistance.

Resistance will change as it depends on physical condition of the substance. Resistivity will remain the same because it depends on the nature of the substance.

Zero. The amount of charge which enters the wire, same amount of charge moves out of the wire.

The direction of electric current in metals is taken opposite to the direction of free electrons. In liquids and gases, the direction is taken in the direction of positive ions or opposite to the direction of negative charge carriers.

The new resistivity p will remain. Since, the resistivity depends on the substance and not on the shape and size.