Tag: evolution and end stages of stars

Questions Related to evolution and end stages of stars

Which of the following lists contains ONLY heavy elements

physics life cycle of stars evolution and end stages of stars the stars stars

  1. Oxygen, Carbon, Iron

  2. Helium, Oxygen, Carbon

  3. Hydrogen, Helium, Carbon

  4. Iron, Hydrogen, Oxygen

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Correct Option: A
Explanation:

Helium and hydrogen being lighter gases are seen in other options other than option a. Thus , such options are incorrect options

In which of the following stages will our Sun form heavy elements?

physics life cycle of stars evolution and end stages of stars the stars stars

  1. Red giant

  2. Stellar Nebula

  3. Blackhole

  4. Main sequence

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Correct Option: A
Explanation:

 In approximately 5 billion years, the sun will begin the helium-burning process, turning into a red giant star. In a red giant, helium nuclei fuse to make carbon, followed by heavier elements such as nitrogen and oxygen.

After a supernova explosion, the remains of the stellar core 

physics life cycle of stars evolution and end stages of stars the stars stars

  1. will always be a neutron star.

  2. will be either a neutron star or a black hole.

  3. will always be a black hole.

  4. may be either a white dwarf, neutron star, or black hole

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Correct Option: B

Analyzing the spectra of stars, the hottest stars are

physics life cycle of stars evolution and end stages of stars the stars stars

  1. red

  2. orange

  3. bluish white

  4. there is no correlation between color and temperature

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Correct Option: C
Explanation:

The temperature of the stars are related to their colors by weins displacement law. Larger the temperature, smaller is their wavelength. Thus, of the colors given , red has maximum wavelength and hence smaller temperature, while bluish white has lesser wavelength and highest temperature. Thus, the star that emits bluish-white color has maximum temperature

White dwarfs

physics life cycle of stars evolution and end stages of stars the stars stars

  1. are believed to be very small, perhaps about the size of the earth.

  2. contain atoms that have collapsed in the center, yet retain the standard distances between nuclei and electrons.

  3. are totally hypothetical stars, based on the best theories, but have never been observed directly.

  4. are found only on the far edge of the universe.

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Correct Option: A
Explanation:

White dwarf stars are characterized by a low luminosity, a mass on the order of that of the Sun, and a radius comparable to that of Earth.

Most stars give off energy

physics life cycle of stars evolution and end stages of stars the stars stars

  1. By nuclear fission or elements heavier than carbon.

  2. By the proton cycle or the carbon cycle.

  3. Drawing it from the virtual vacuum through a black hole.

  4. By burning hydrogen and giving off water vapor.

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Correct Option: B
Explanation:

The protonproton chain reaction is one of two known sets of nuclear fusion reactions by which stars convert hydrogen to helium. Using this method, the stars convert particles to energy

As the age of star increases

physics life cycle of stars evolution and end stages of stars the stars stars

  1. Helium quantity increases

  2. Helium quantity decreases

  3. Helium quantity does not

    change

  4. Helium, Hydrogen both

    quantities increases

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Correct Option: A

What can we learn about a star from a life track on an H-R diagram?

physics life cycle of stars evolution and end stages of stars the stars stars

  1. how long ago it was born

  2. when it will die

  3. where it is located

  4. what surface temperature and luminosity it will have at each stage of its life

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Correct Option: D
Explanation:

The HertzsprungRussell diagram, abbreviated HR diagram, HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures. More simply, it plots each star on a graph measuring the star's brightness against its temperature (color).

______________are the result of exploding stars that initially are more than about eight times the sun's mass.

physics life cycle of stars evolution and end stages of stars the stars stars

  1.  stars

  2. black hole

  3. supernova

  4. none of these

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Correct Option: C

Which of the following is the stage where a massive star explodes and releases a lot of energy?

physics life cycle of stars evolution and end stages of stars the stars stars

  1. Red supergiant

  2. Blackhole

  3. Main sequence

  4. Supernova

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Correct Option: B
Explanation:

Stars with very large masses can become black holes. A black hole releases a huge amount of gravitational energy, as material swirls toward its event horizon. This energy produces a jet of particles that streams over a distance of 300,000 light-years.