PHYSICS MOCK EXAM

What is the difference between special relativity and General Relativity?

• Special Relativity applies only to inertial frame of reference, while General applies to all frames of reference.

• Special Relativity deals only with effect of motion on space and time, while General Relativity deals with the effects of gravity on space and time

• Special Relativity is a classical theory, while General Relativity is a quantum theory.

• Special Relativity is simpler and more fundamental General relativity.

According to special Relativity, as an object approaches the speed of light:

• Its mass increases

• Its length contracts in the direction of motion.

• Time slows down for the object

• All of the above

Which of the following is statements is true regarding the Galilean and Lorentz transformation?

• The Galilean transformation is based on classical mechanics and Lorentz transformation is based on Special Relativity.

• The Galilean transformation is applicable to all velocities, while the Lorentz transformation is only applicable to low velocities.

• The Galilean transformation preserves invariant speed of light, while the Lorentz transformation does not.

• Both the Galilean transformation and the Lorentz transformation are equivalent and can be used interchangeable in all situations.

What is length contraction?

• An effect of relativity where an object appears longer when moving at high speed

• An effect of relativity where an object appears wider when moving at high speed

• An effect of relativity where an object appears narrower when moving at high speed.

• An effect of relativity where an object appears shorter when moving at high speed

Which of the following best describes Einstein’s postulate?

• The laws of physics are different for each observer.

• The laws of physics remain the same regardless of an observer’s motion

• The speed of light in a vacuum can vary based on an observer’s motion

• The laws of physics only apply to objects in uniform motion

According to the special theory of relativity, if a 30-year old astronaut sent on a space mission is accelerated to speeds close to that of light, and then returns to earth after 20 years as measured on earth, what would be his biological age upon returning?

If my reference frame is inertial under what condition that a reference frames moving relative to me is non-inertial?

• Remain at rest.

• Move with constant velocity.

• Be accelerating.

• None of the above

Which statement is true about charge carrier generation in intrinsic and extrinsic semiconductors?

• Only intrinsic semiconductors can have free charge carriers

• Only extrinsic semiconductors can have free charge carriers

• Both intrinsic and extrinsic semiconductors can have free charge carriers

• Neither intrinsic nor extrinsic semiconductors can have free charge carriers

Which of the following options describes a Zener diode?

• A diode that allows current to flow in both directions

• A diode used for voltage regulation and voltage reference

• A diode designed for high-speed switching applications

• A diode used for radio frequency (RF) signal detection

What does the IV characteristic curve of a diode represent?

• The current-voltage relationship of a diode under varying conditions

• The power dissipation of a diode under different voltages

• The internal resistance of a diode at different operating temperatures

• The light intensity produced by a diode in different circuit configurations