Identification of Practical Assessment Apparatus

Questions and Answers

What does Ohm's Law state about the relationship between current, voltage, and resistance in a conductor?

Current is independent of voltage and resistance.

Current is directly proportional to voltage and inversely proportional to resistance. (correct)

Current is equal to the product of voltage and resistance.

Current is directly proportional to resistance and inversely proportional to voltage.

Which of the following factors does NOT affect the resistance of a metallic conductor?

Length of the conductor

Voltage applied across the conductor (correct)

Material of the conductor

Temperature of the conductor

What is the unit of electrical resistivity?

Ohm-meter (correct)

Siemens

Coulomb

Volt

In a circuit with a series combination of resistors, how does the total resistance compare to individual resistances?

Total resistance is the sum of all individual resistances. Signup and view all the answers

What does Ohm's Law state regarding the relationship between voltage, current, and resistance?

Voltage is the product of current and resistance. Signup and view all the answers

What effect does increasing the temperature have on the resistance of a typical metallic conductor?

Resistance increases with increasing temperature. Signup and view all the answers

Kirchhoff's first rule (junction rule) states that:

The sum of the currents entering a junction equals the sum of the currents leaving the junction. Signup and view all the answers

In a series combination of resistances, the total resistance is:

Equal to the sum of the individual resistances. Signup and view all the answers

What is the main purpose of a Wheatstone bridge in an electric circuit?

To calculate unknown resistances. Signup and view all the answers

When using a meter bridge to find the resistance of a given wire, which factor must be controlled for accurate results?

Temperature of the wire. Signup and view all the answers

Which configuration is required to verify the laws of resistances using Ohm’s Law?

A mix of series and parallel configurations. Signup and view all the answers

When resistors are combined in parallel, what happens to the total resistance?

Total resistance is less than the smallest individual resistance. Signup and view all the answers

What is the effect of increasing the number of turns in an inductor coil on its inductance?

Inductance increases. Signup and view all the answers

To determine the resistance per cm of a wire, which method is primarily used?

Graph plotting between voltage and current. Signup and view all the answers

When using the half deflection method to find the resistance of a galvanometer, what is primarily being measured?

Deflection angle in relation to current. Signup and view all the answers

Which components can be identified from a mixed collection in an experiment focused on resistance?

Diode and inductor. Signup and view all the answers

What is one of the factors that affects the internal resistance of a cell?

Temperature of the cell Signup and view all the answers

In an LDR circuit, what happens to the current when the distance of the incandescent lamp is increased?

Current decreases as the distance increases Signup and view all the answers

What equipment is used to find the refractive indices of liquids in the suggested project?

Convex lens and flat mirror Signup and view all the answers

Which of the following statements is true regarding a self-designed transformer?

Ratio of output and input voltage depends on the number of turns Signup and view all the answers

Which experimental setup is used to study the self-inductance of a coil?

A.C. source with bulb in series Signup and view all the answers

What is the purpose of using a compass needle in investigating the earth's magnetic field?

To plot magnetic field lines Signup and view all the answers

What phenomenon is being studied with respect to the dependence of the angle of deviation?

Refraction through different mediums Signup and view all the answers

What law is applied to estimate the charge induced on suspended Styrofoam balls?

Coulomb's Law Signup and view all the answers

Study Notes

Identification of Laboratory Apparatus

Meter Scale: Used for measuring lengths and distances accurately.
Voltmeter and Ammeter: Instruments for measuring voltage and current, respectively; typically have a specific shape based on their function.
Battery/Power Supply: Provides the necessary electrical energy for experiments.
Connecting Wires: Essential for creating circuits; should be insulated to prevent short circuits.
Standard Resistances: Used to compare and measure unknown resistances in practical experiments.
Meter Bridge: A device to measure the resistance of a wire by balancing it against known resistances.
Screw Gauge: Measures small dimensions with high precision.
Jockey Galvanometer: Used to detect and measure small currents.
Resistance Box: Contains a range of standard resistances for experiments.
Potentiometer: Measures voltage by allowing the adjustment of resistance in an electric circuit.
Leclanché Cell and Daniell Cell: Both electrochemical cells; differ in design with Leclanché in a glass container and Daniell in a copper container.
Rheostat: A variable resistor to control current flow.
Diode: Allows current to flow in one direction; essential in rectification.
Resistors: Can be wire-wound (high precision) or carbon (general use).
Capacitors: Store electric energy; available in various types.
Inductors: Coils that store energy in a magnetic field when current flows through them.
Electric/Bell and Transformer: Devices used in various circuit applications, with transformers specifically for voltage adjustment.

Overview of Practicals

Determine Resistance: Find the resistance per cm of a wire by graphing voltage versus current.
Verify Laws of Combination: Validate series and parallel combinations of resistances through Ohm's Law.
Meter Bridge Experiment: Use to measure resistance of a given wire or standard resistor.
Galvanometer Resistance: Determine resistance via the half deflection method.
Component Identification: Distinguish between resistors, capacitors, inductors, and diodes from a mixed collection.
Optical Experiments: Analyze differences between convex/concave lenses and mirrors; measure their powers.
Inductor Coil Design: Investigate inductance changes with turns and core material (ferromagnetic).
Electric Fields and Gauss's Theorem: Study electric fields due to point charges and dipoles; apply Gauss's theorem in various scenarios.

Electrostatic Potential and Capacitance

Electric Potential: Defined for point charges, dipoles, and charge systems; involves potential energy of configurations.
Conductors vs. Insulators: Differentiate based on charge behavior within materials.
Capacitance Basics: Understand capacitors' function, series/parallel combinations, and energy storage concepts without derivations.

Current Electricity Concepts

Electric Current: The flow of electric charges; involves drift velocity and mobility in par with current.
Ohm's Law: Correlation between voltage, current, and resistance; V-I characteristics differ for linear/non-linear circuits.
Cell Resistances: Internal resistance affects performance; explore series/parallel combinations of cells.
Kirchhoff's Rules: Essential for analyzing complex circuits, along with Wheatstone bridges for resistance measurements.

Investigatory Projects

Cell EMF and Internal Resistance Factors: Study variables influencing the efficiency of electrochemical cells.
LDR Current Variations: Analyze how light intensity and distance affect current flow in circuits.
Refractive Indices Measurement: Use equipment to find refractive indices of different liquids.
Transformer Performance: Investigate ratios of output/input voltage concerning primary/secondary coil turns.
Angle of Deviation: Understand optics by measuring how angles change with different transparent fluids in a prism.
Charge Induction Measurement: Use Coulomb's law with Styrofoam balls to estimate induced charges.
Self-Inductance Experiments: Observe inductance effects in coils within A.C. circuits.
Earth's Magnetic Field Study: Utilize compass needles and bar magnets to map magnetic field lines.

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Description

This quiz focuses on familiarizing students with various apparatus used in practical assessments, including measuring instruments such as voltmeters and ammeters, different types of batteries, and connecting wires. It aims to help understand the purpose and identification of important tools like the meter bridge, potentiometer, and more. Prepare to test your knowledge on the key apparatus used in physics experiments.