Question 1:

What is a black hole?

Explanation: The correct answer is B) A region of space where gravity is extremely strong. A black hole is a region of space with a gravitational field so intense that nothing, not even light, can escape its pull. The gravitational force near a black hole is incredibly strong due to the immense mass concentrated in a small volume.

Question 2:

What is the event horizon of a black hole?

Explanation: The correct answer is A) The point of no return, beyond which nothing can escape. The event horizon of a black hole is the boundary surrounding the black hole, where the gravitational pull becomes so strong that once an object crosses it, it cannot escape. This boundary marks the point of no return for anything falling into the black hole.

Question 3:

What happens to time near a black hole?

Explanation: The correct answer is B) Time slows down. According to the theory of General Relativity, time near a black hole is affected by the intense gravitational field. As an observer gets closer to the black hole, time appears to slow down relative to a distant observer. This phenomenon is known as gravitational time dilation.

Question 4:

What are gravitational waves?

Explanation: The correct answer is A) Ripples in the fabric of spacetime caused by accelerating masses. Gravitational waves are disturbances in the fabric of spacetime that propagate outward from accelerating masses. These waves were predicted by Einstein's theory of General Relativity and were first directly detected in 2015.

Question 5:

How are gravitational waves detected?

Explanation: The correct answer is D) Using interferometers to detect the tiny changes in distance caused by the waves. Gravitational waves are detected using interferometers, which are sensitive devices that measure the minute changes in the lengths of two perpendicular arms caused by passing gravitational waves. This allows scientists to directly observe and study these elusive cosmic phenomena.