Skip to main content

Physical Science:

Dr. Sunil Karna

Exercises 13.4 Exercise

1.

A star with high luminosity and low temperature would be located in which part of the HR diagram?
  1. Upper left
  2. Upper right
  3. Lower left
  4. Lower right

2.

Which of the following statements about the HR diagram is true?
  1. Stars on the main sequence fuse hydrogen into helium in their cores
  2. The HR diagram can be used to determine the distance to a star
  3. Red giants are more massive than main sequence stars
  4. The HR diagram only applies to stars in our galaxy

3.

What is the significance of the position of a star on the HR diagram?
  1. It indicates the star’s distance from Earth
  2. It provides information about the star’s chemical composition
  3. It reveals the star’s age and evolutionary stage
  4. It determines the star’s brightness in the night sky
Answer.
c.

4.

What is the Sun’s approximate distance from Earth?
  1. 93,000 miles
  2. 93,000 kilometers
  3. 93 million miles
  4. 93 million kilometers
Answer.
c.

5.

What is the Sun’s approximate distance from Earth?
  1. 93,000 miles
  2. 93,000 kilometers
  3. 93 million miles
  4. 93 million kilometers
Answer.
c.

6.

What is the Sun mostly made of?
  1. Hydrogen and helium
  2. Carbon and oxygen
  3. Iron and nickel
  4. Silicon and magnesium

7.

What is the Sun’s primary source of energy?
  1. Nuclear fusion
  2. Solar winds
  3. Electromagnetic radiation
  4. Gravitational energym

8.

Which type of star is most likely to end its life as a black hole?
  1. Red giant
  2. Main sequence star
  3. White dwarf
  4. Blue supergiant
Answer.
d.

9.

What happens to a star when it runs out of fuel for nuclear fusion?
  1. It explodes in a supernova
  2. It collapses into a black hole
  3. It becomes a white dwarf
  4. It continues to shine by burning its outer layers

10.

What happens to the core of a massive star after a supernova explosion?
  1. It collapses into a black hole
  2. It becomes a neutron star
  3. It becomes a white dwarf
  4. It continues to shine as a red giant

11.

What is the ultimate fate of a low-mass star, like the Sun?
  1. It becomes a black hole
  2. It explodes in a supernova
  3. It becomes a white dwarf
  4. It becomes a neutron star
PrevTopNext