12 Questions
What is the unit of resistivity for a material?
Ohm metre
How is a rheostat used to regulate current in a circuit?
By changing the resistance gradually
In conductors, what is responsible for the flow of current?
Electrons
What is the role of emf in enabling current flow in a circuit?
Supplying electrical energy
What is resistivity?
The resistance of a conductor of unit length and unit area of cross section
If the length of a uniform wire is doubled, what happens to its resistivity?
There is no change
What happens to the resistance of a conductor when its temperature increases?
It increases
In the parallel connection of cells, what happens to the current if the number of cells is increased?
The current remains the same
What is the resistance of the conductor in the given table?
12 ohms
From the first two circuits, which lamp is likely to glow with more brightness and why?
Lamp in circuit 2, because it has lower resistance
What are two more factors that influence the resistance of a conductor, in addition to length and thickness?
Nature of the substance and temperature
How does the resistance of a conductor change with temperature?
It increases with increasing temperature
This quiz covers concepts related to resistance in conductors and the use of rheostats to regulate current in a circuit. Topics include the resistivity of materials, the relationship between resistance and length in a uniform wire, and the function of a rheostat in a circuit.
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