Quiz on Relativity

What is the speed of light postulate?

• Light can travel faster than sound.

• The speed of light in a vacuum is constant in all inertial reference frames.

• The speed of light is only relevant in outer space.

• The speed of light varies in different mediums.

What is time dilation?

• The speeding up of a clock in motion.

• The slowing down of a clock as observed by someone in relative motion.

• The effect of gravity on time.

• The increase of time in a vacuum.

What does length contraction refer to?

• All objects contract regardless of their motion.

• An object expands when it moves.

• An object's length shrinks in the direction of its velocity.

• Length is unaffected by motion.

What is the cosmic speed limit?

• All objects can exceed the speed of light.

• Only massless electromagnetic radiation can travel at light speed.

• Nothing can travel faster than sound.

• The speed of light is only a guideline.

What does mass-energy equivalence indicate?

• Energy can only be produced through motion.

• Mass can be created from energy.

• An object contains energy even when at rest.

• Mass and energy are unrelated.

What is one consequence of General Relativity?

• It claims that gravity does not affect light.

• It denies the bending of light.

• It states that time is absolute.

• It predicts the existence of black holes.

Which of the following is NOT a postulate of the special theory of relativity?

• Gravity affects the speed of light.

• Mass can be converted to energy.

• The speed of light is the same in all inertial reference frames.

• The laws of physics are the same in all inertial reference frames.

What happens to the length of an object moving at high speed?

• It increases in the direction of motion.

• It remains unchanged.

• It shrinks in the direction of motion.

• It expands in all directions.

What is the significance of the equation E=mc²?

• It proves that light has mass.

• It shows that energy and mass are equivalent.

• It indicates that mass can be created from nothing.

• It states that energy cannot be converted to mass.

What is the effect of gravity on time according to General Relativity?

• Time remains constant regardless of gravity.

• Time slows down in stronger gravitational fields.

• Gravity has no effect on time.

• Time speeds up in stronger gravitational fields.