DailyQuiz
About today's quiz

Physics — Intermediate

A new quiz is published every day for this topic and level. Answer the questions, read the explanations, and complete the quiz to keep your streak alive.

Tips before you start

  • •Read every question carefully before answering. Some questions include subtle wording that changes the correct answer.
  • •Take your time on the first question. There is no time limit, but your total time is tracked for your statistics.
  • •After each answer, read the explanation. Even correct answers often include useful context you might not know.
  • •Come back tomorrow for a brand new quiz on the same topic. Daily practice is the most effective way to retain what you learn.
IntermediateScience
Today's questions

Today's quiz questions

These are the questions that make up today's quiz. Test your knowledge, see how much you know, and learn from the explanation behind every answer.

  1. 1.What is the work-energy theorem?

    • •Net work equals the change in kinetic energy
    • •The total energy of a system is always equal to the work done on it
    • •Potential energy is always converted to kinetic energy when work is done
    • •Work always equals force times distance

  2. 2.What is the difference between series and parallel circuits?

    • •Series circuits have higher resistance; parallel always have lower
    • •Components in series share voltage; components in parallel share current
    • •Series circuits use AC; parallel circuits use DC
    • •In series, current follows one path; in parallel, it splits into several

  3. 3.What is the difference between AC and DC current?

    • •AC periodically reverses direction; DC flows in one direction only
    • •AC is analog current; DC is digital current
    • •AC transmits at low voltages; DC at high voltages
    • •AC is used in batteries; DC is used in wall outlets

  4. 4.What does E = mc² mean?

    • •Mass and energy are equivalent: E = mc²
    • •Energy equals momentum times the speed of sound squared
    • •Electric field equals magnetic charge times the speed of light
    • •Entropy equals molecular count times a constant

  5. 5.What is specific heat capacity?

    • •The temperature at which a substance changes state
    • •The maximum temperature a substance can reach
    • •The rate at which a substance conducts heat
    • •The heat needed to raise 1 kg of a substance by 1°C

  6. 6.What is centripetal force?

    • •The force that slows down rotating objects
    • •The outward force felt by an object moving in a circle
    • •The gravitational force between two rotating bodies
    • •The inward force required to keep an object moving in a circular path

  7. 7.What is a semiconductor?

    • •A material that conducts electricity in only one direction
    • •A material that only conducts electricity at high temperatures
    • •A material with conductivity between a conductor and an insulator
    • •A conductor that has been partially insulated

  8. 8.What is torque?

    • •The rotational tendency of a force about an axis
    • •The total energy in a rotating system
    • •The speed of rotation of an object
    • •The friction between rotating surfaces

  9. 9.What is the formula for kinetic energy?

    • •mv
    • •½mv²
    • •ma
    • •mgh

  10. 10.What is Pascal's law?

    • •Pressure applied to an enclosed fluid is transmitted equally in all directions
    • •The pressure of a gas increases with temperature at constant volume
    • •Fluid pressure decreases with depth
    • •Fluid flows faster through narrower pipes