Tag: stars

Questions Related to stars

During which of the following phases does the core of a massive star have so much gravity that even light can't escape?

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

  1. Neutron Star

  2. Supernova

  3. White Dwarf

  4. Black Hole

Show answer
Correct Option: D
Explanation:

Once a black hole has formed, it can continue to grow by absorbing mass from its surroundings. The gravitational force becomes so intense that even light cannot escape from it

Why do massive stars have shorter lifespans than average stars?

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

  1. They are excited to get through their lifecycles faster

  2. They have less steps in their lifecycles

  3. They burn their fuel faster

  4. They have less fuel to burn

Show answer
Correct Option: C
Explanation:

Massive stars live shorter lives than the common small stars because even though they have a larger amount of hydrogen for nuclear reactions, their rate of consuming their fuel is very much greater.

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

Show answer
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

Show answer
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.

Show answer
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.

Show answer
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

Show answer
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

Show answer
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).