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Questions and Answers
What is the relation between drift velocity and the current flowing through a conductor?
What is the relation between drift velocity and the current flowing through a conductor?
What does the term 'mobility' of a charge conductor refer to?
What does the term 'mobility' of a charge conductor refer to?
How is the conductivity of a semiconductor calculated given the electron and hole concentrations along with their mobilities?
How is the conductivity of a semiconductor calculated given the electron and hole concentrations along with their mobilities?
Which factor does not affect the resistance of a conductor?
Which factor does not affect the resistance of a conductor?
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How does stretching a cylindrical wire affect its resistance?
How does stretching a cylindrical wire affect its resistance?
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What is the key characteristic of an ohmic conductor according to Ohm's law?
What is the key characteristic of an ohmic conductor according to Ohm's law?
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What does a meter bridge measure?
What does a meter bridge measure?
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What happens to the equivalent resistance when two identical resistor parts are connected in parallel?
What happens to the equivalent resistance when two identical resistor parts are connected in parallel?
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What is the charge flowing through the conductor between t = 2 sec and t = 3 sec if the current is defined as $I = 2t + 3t^2$?
What is the charge flowing through the conductor between t = 2 sec and t = 3 sec if the current is defined as $I = 2t + 3t^2$?
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What is the ratio of resistances of three wires if their masses are in the ratio 1:2:3 and their lengths in the ratio 3:2:1?
What is the ratio of resistances of three wires if their masses are in the ratio 1:2:3 and their lengths in the ratio 3:2:1?
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If the potential difference across a conductor is increased to 2V with temperature constant, what happens to the drift velocity?
If the potential difference across a conductor is increased to 2V with temperature constant, what happens to the drift velocity?
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Which quantity remains constant when a battery is connected to a conductor of non-uniform cross-sectional area?
Which quantity remains constant when a battery is connected to a conductor of non-uniform cross-sectional area?
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Given two voltage vs current graphs at temperatures T1 and T2, what can be said about the relationship between T1 and T2?
Given two voltage vs current graphs at temperatures T1 and T2, what can be said about the relationship between T1 and T2?
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What is the resistance between two diagonal points of a square formed from a metallic wire with total resistance of 12 ohms?
What is the resistance between two diagonal points of a square formed from a metallic wire with total resistance of 12 ohms?
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What was the original resistance of a circuit if the current was 5 A and dropped to 4 A after adding 2 Ω resistance?
What was the original resistance of a circuit if the current was 5 A and dropped to 4 A after adding 2 Ω resistance?
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If an electric motor runs on a DC source of emf 200 V and draws a current of 10 A with an efficiency of 40%, what is the resistance of the armature?
If an electric motor runs on a DC source of emf 200 V and draws a current of 10 A with an efficiency of 40%, what is the resistance of the armature?
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Study Notes
Physics Class Test
- The test is for Physics, held on 12-09-2024
- Full marks are 62, and the time allotted is 120 minutes
- There are two sections: A and B
- Section A has 20 marks, with 10 questions worth 2 marks each
- Section B has 42 marks, with 7 questions worth 6 marks each
Section A
- Question 1: The charge flowing through a conductor between 2 seconds and 3 seconds is calculated using the current equation I = 2t + 3t^2
- Question 2: The ratio of resistances of three wires made of the same material is determined by their lengths and cross-sectional areas, which are related to the ratio of their masses
- Question 3: Drift velocity of free electrons in a conductor is directly proportional to the applied potential difference
- Question 4: Current remains constant in a conductor of non-uniform cross-sectional area when a battery is connected
- Question 5: The graph shows that the resistance of a conductor increases with temperature
- Question 6: The resistance between two diagonal points of a square formed by bending a wire is calculated by considering the resistance of each side
- Question 7: The original resistance of a circuit can be calculated using the current values before and after adding an additional resistance
- Question 8: The current in the circuit can be calculated using Kirchhoff's laws
- Question 9: The current in the circuit can be calculated using Ohm's law and by considering the individual resistances
- Question 10: The efficiency of an electric motor is calculated using the power input and power output, which can be used to determine the resistance of the armature
Section B
- Question 11:
- Drift velocity is related to current, charge density, and cross-sectional area
- Mobility is the drift velocity per unit electric field
- Conductivity of a semiconductor is calculated using the electron and hole concentrations, mobilities, and charge of an electron
- Question 12:
- The resistance of a conductor depends on its length, cross-sectional area, and resistivity
- Resistivity is the resistance of a conductor with unit length and unit cross-sectional area
- Percentage increase in resistance is calculated using the initial and final lengths
- Question 13:
- Ohm's law states that the current flowing through a conductor is directly proportional to the potential difference across its ends, provided the temperature remains constant
- A metallic conductor exhibits ohmic behavior at low currents but becomes non-ohmic at high currents due to the increase in temperature
- The resistance of the tungsten filament at 500°C is calculated using the temperature coefficient of resistance
- Question 14:
- Carbon resistors are color-coded to indicate their resistance values
- The color bands on the resistors correspond to specific numerical values
- Resistance is a property of a material that opposes the flow of electric current while a resistor is a component designed to provide a specific resistance
- Question 15:
- The meter bridge is used to determine the unknown resistance of a conductor
- The null point on the meter bridge is related to the resistances of the two arms
- The equivalent resistance of a network can be calculated using the resistances of individual components and series and parallel combinations
- Question 16:
- The potentiometer is a device used to measure the potential difference between two points
- The null point on the potentiometer is the point where the potential difference is zero
- Sensitivity of a potentiometer is affected by factors like the length of the wire and the potential difference across it
- Question 17:
- The power rating of a heater coil indicates its power consumption at a specific voltage
- When the heater coil is cut into two parts and connected in parallel, the total resistance decreases
- Question 18:
- The efficiency of a device is a measure of its output power relative to its input power
- The power dissipated by a resistor is calculated using the resistance and the current flowing through it
- Question 19:
- The internal resistance of a cell is the resistance offered by the electrolyte and the electrodes of the cell
- The terminal potential difference of a cell is the potential difference across its terminals when current is flowing through it
- Question 20:
- The energy stored in a capacitor is related to its capacitance and the square of the potential difference across its plates
- The potential energy density of an electric field is the energy stored per unit volume
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Description
Test your knowledge in Physics with this comprehensive class test designed for the year 2024. Covering key topics such as current, resistance, and drift velocity, this quiz consists of two sections. Prepare for both conceptual understanding and problem-solving skills in electricity and magnetism.
