Question 1:

What is the primary property of a black hole?

Explanation: The primary property of a black hole is its strong gravitational pull. The gravitational force near a black hole is so powerful that nothing can escape it once it crosses the event horizon. Therefore, the correct answer is D) Strong gravitational pull.

Question 2:

What effect does a black hole have on nearby objects?

Explanation: A black hole distorts space and time around it due to its immense gravitational pull. This effect is known as gravitational lensing. Therefore, the correct answer is C) It distorts space and time around them.

Question 3:

Which of the following statements about black holes is true?

Explanation: Black holes do not emit visible light. They are black because even light cannot escape their gravitational pull. Black holes can have electric charge, but most astrophysical black holes are expected to be neutral. Therefore, the correct answer is C) Black holes can have electric charge.

Question 4:

What is the phenomenon called when a black hole pulls matter from a companion star?

Explanation: When a black hole pulls matter from a companion star through its gravitational attraction, the process is called accretion. The matter forms an accretion disk around the black hole before being consumed. Therefore, the correct answer is A) Accretion.

Question 5:

What is the theoretical boundary around a black hole beyond which no observer can see or return?

Explanation: The theoretical boundary around a black hole beyond which no observer can see or return is called the event horizon. It marks the point of no return for anything crossing it. Therefore, the correct answer is D) Event horizon.