Mid-Cycle 5 Practice Second

What is the unit of electric charge?

• Volt

• Coulomb

• Ampere

• Ohm

Which component in an electric motor is responsible for converting electrical energy into mechanical energy?

• Stator

• Rotor

• Commutator

• Armature

What is the formula for the period of a simple pendulum?

Which of the following best describes the energy transfer in wave propagation?

• Energy is transferred through the medium without the medium itself moving.

• Energy is transferred by the movement of the medium itself.

• Energy is not transferred at all.

• Energy is transferred only in a vacuum.

What is the primary factor that affects the speed of surface waves on a body of water?

• Water temperature

• Water depth

• Water salinity

• Water color

In a rope, what happens to the pulse when it reaches a fixed end?

• It is absorbed.

• It is reflected and inverted.

• It is reflected without inversion.

• It continues without reflection.

Explain how electromagnetic forces are involved in the operation of a generator.

• Electromagnetic forces create a magnetic field that induces current in the generator's coil.

• Electromagnetic forces repel the electrons, causing them to move in a circuit.

• Electromagnetic forces are not involved in the operation of a generator.

• Electromagnetic forces only affect the external components of a generator.

Describe the role of the commutator in an electric motor.

• It reverses the direction of current in the coil to maintain rotation.

• It increases the voltage supplied to the motor.

• It decreases the resistance in the motor circuit.

• It acts as a cooling system for the motor.

Derive the equation for the potential energy stored in a spring during simple harmonic motion.

How does the amplitude of a wave affect its energy?

• Energy is directly proportional to the square of the amplitude.

• Energy is inversely proportional to the amplitude.

• Energy is directly proportional to the amplitude.

• Energy is not affected by the amplitude.