18 Questions
What happens to the resistance of a conductor if its length is doubled, keeping the area of cross-section constant?
It doubles
Which material property determines how well a material resists the flow of electric current?
Resistivity
In which scenario would the resistance of a conductor increase?
Decreasing its length
What effect does increasing the temperature have on the resistivity of most materials?
Increases resistivity
What happens to the total resistance when resistors are connected in parallel?
Decreases
What is the relationship between voltage, current, and resistance in an electrical circuit?
$V = IR$
What impurity atom can be doped into pure silicon to make it a p-type semiconductor?
Boron
How can the electrical conductivity of pure germanium be increased?
Doping acceptor impurities
What is the resistivity range of a semiconductor at room temperature?
$10^{-2}$ to $10^{-5}$ Ω cm
What is the forbidden energy gap between the valence band and the conduction band in a semiconductor?
1 eV
What is the forbidden energy gap for germanium crystal at 0 K?
0.071 eV
What is the temperature coefficient of resistance of a semiconductor?
Positive
What is the resistance of a wire if the slope of its 𝐼 − 𝑉 characteristic is 2 mA/volt?
5 Ohms
Which of the following is NOT a limitation of Ohm's law?
Valid for all types of materials
What is the resistivity of a material if its resistance is 50 Ω and length is 10 m?
0.5 Ω/m
In an electric circuit, five cells with emf 4V and internal resistance 0.5 Ω are connected in series. What is the total emf of this combination?
24 V
When a wire's length increases by 20%, how does its resistance change?
Increases by 40%
What are the characteristic features of a material suitable for fuse wires?
Low melting point and high resistivity
Test your knowledge on electricity concepts and Ohm's Law with this quiz. Questions cover topics such as resistance calculation, limitations of Ohm's Law, resistivity of materials, and current calculations in series circuits.
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