HSC Science 12th Board Exam Physics Concepts Quiz

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Questions and Answers

What concept is associated with Faraday's Laws of Electromagnetic Induction?

  • Kinetic Theory of Gases
  • Magnetic Effects of Electric Current (correct)
  • Ampere's Circuital Law
  • Law of Radioactive Decay

What does a Zener diode function as in a circuit diagram?

  • Voltage Regulator (correct)
  • Resistor
  • Capacitor
  • Transistor

Which law is associated with the conservation of angular momentum?

  • Faraday's Laws of Electromagnetic Induction
  • Conservation of Angular Momentum (correct)
  • Law of Radioactive Decay
  • Ampere's Circuital Law

What concept is Laplace's law derived for?

<p>Rotational Dynamics (A)</p> Signup and view all the answers

What does the potential gradient of a wire depend on?

<p>Magnetic Effects of Electric Current and Semiconductors (D)</p> Signup and view all the answers

Which concept is related to the derivation of the mathematical expression for the law of radioactive decay?

<p>Atoms, Molecules and Nuclei (D)</p> Signup and view all the answers

What does Laplace's law describe?

<p>Surface tension of a spherical membrane (A)</p> Signup and view all the answers

How can a moving coil galvanometer be converted into an ammeter?

<p>By adding a shunt resistance (B)</p> Signup and view all the answers

What is the formula for magnetization and its SI unit?

<p>M = B/H, Wb/m^2 (C)</p> Signup and view all the answers

Which concept does the coefficient of self-induction relate to?

<p>Inductance (B)</p> Signup and view all the answers

How is the current sensitivity of a moving coil galvanometer expressed?

<p>$\frac{θ}{I}$, degree/A (D)</p> Signup and view all the answers

In what context does Laplace's law apply?

<p>Surface tension of spherical membranes (C)</p> Signup and view all the answers

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Study Notes

Faraday's Laws of Electromagnetic Induction

  • Associated with electromagnetic induction, stating that a change in magnetic field within a closed loop induces an electromotive force (EMF).

Zener Diode Function

  • Functions as a voltage regulator in circuit diagrams by allowing current to flow in the reverse direction when a specified voltage is exceeded.

Conservation of Angular Momentum

  • Governed by the principle that the total angular momentum of a closed system remains constant if no external torque acts on it.

Laplace's Law

  • Derived from the concepts of fluid dynamics, particularly to describe the pressure difference across the curved surface of a liquid.

Potential Gradient Dependency

  • Depends on the electric field strength and the resistivity of the wire material, influencing how voltage changes along the length of the wire.

Mathematical Expression for Radioactive Decay

  • Derivation relates to probability; the decay rate is exponential, expressing how the quantity of a radioactive substance decreases over time.

Laplace's Law Description

  • Describes the relationship between the pressure difference across a spherical surface and the curvature of the surface, crucial in understanding phenomena in fluid mechanics.

Converting Moving Coil Galvanometer to Ammeter

  • Achieved by adding a parallel shunt resistor, allowing the galvanometer to measure larger currents without damage.

Magnetization Formula and SI Unit

  • Formula is M = magnetic moment per unit volume, where the SI unit is ampere per meter (A/m).

Coefficient of Self-Induction

  • Relates to the ability of a coil to induce voltage due to changes in its own current, a key concept in electromagnetic theory.

Current Sensitivity of Moving Coil Galvanometer

  • Expressed as the ratio of the deflection (in degrees) to the current flowing through the galvanometer, indicating its measuring capability.

Context of Laplace's Law

  • Applies in the study of bubbles, droplets, and the behavior of liquid interfaces, particularly in capillary action and surface tension dynamics.

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