Section A: Objective Type Questions
Electric current is the flow of _________. a. Protons b. Electrons c. Neutrons d. Positrons
The resistance of a conductor depends on its ____________. a. Length and temperature b. Cross-sectional area and resistivity c. Voltage and current d. Charge and potential difference
The unit of resistivity is _________. a. Ohm-meter b. Coulomb c. Ampere d. Joule
Kirchhoff's first law is based on the principle of ___________. a. Conservation of charge b. Conservation of energy c. Conservation of momentum d. Conservation of mass
The time constant of an RC circuit depends on the ___________. a. Resistance and capacitance of the circuit b. Voltage and current of the circuit c. Temperature of the circuit d. Length of the circuit
The potential difference across a resistor is directly proportional to the ____________. a. Resistance of the resistor b. Current flowing through the resistor c. Voltage applied across the resistor d. Length of the resistor
A potentiometer is a device used to measure ____________. a. Resistance of a conductor b. Current flowing through a conductor c. Voltage of a cell d. All of the above
Joule's law of heating states that the heat generated in a conductor is proportional to ___________. a. Voltage applied across the conductor b. Current flowing through the conductor c. Resistance of the conductor d. All of the above
The magnetic field around a current-carrying wire is ___________. a. Circular b. Spherical c. Cylindrical d. Rectangular
A cyclotron is a device used to ____________. a. Measure the magnetic field b. Generate an electric field c. Accelerate charged particles d. Create a vacuum
Section B: Short Answer Type Questions
- State Ohm's law and derive its mathematical expression.
- Define resistivity and state its SI unit. Explain how it is related to the conductivity of a material.
- Explain the concept of internal resistance of a cell and how it affects the output voltage of the cell.
- State Kirchhoff's laws and explain their significance in current electricity.
- Derive the expression for the capacitance of a parallel-plate capacitor in terms of its area, separation, and dielectric constant.
Section C: Long Answer Type Questions
- Derive the expression for the resistance of a conductor in terms of its length, cross-sectional area, and resistivity. How does the resistance of a wire change with temperature?
- Explain the phenomenon of drift velocity and derive its expression in terms of electric field, relaxation time, and mobility of charge carriers.
- Describe the construction and working of a meter bridge. How is it used to measure the resistance of a conductor?
- Explain the principle of a potentiometer and how it can be used to measure the emf of a cell.
- Define the term 'magnetic field' and explain how it is related to the current flowing through a conductor. Explain the working principle of a cyclotron and how it is used to accelerate charged particles.
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