Tag: the stars

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Questions Related to the stars

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

Compared to the star it evolved from, a white dwarf is 

  1. hotter and brighter.

  2. hotter and dimmer.

  3. cooler and brighter.

  4. cooler and dimmer.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A star's temperature is only 5,800 K, while a white dwarf has a temperature of 100,000 K. A white dwarf's faint luminosity comes from the emission of stored thermal energy; no fusion takes place in a white dwarf wherein mass is converted to energy. Hence it is dimmer than star

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

What happens to the core of a star after a planetary nebula occurs? 

  1. It contracts from a protostar to a main-sequence star.

  2. It breaks apart in a violent explosion.

  3. It becomes a white dwarf.

  4. It becomes a neutron star.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

After a low-to-medium mass star sheds its outer layers as a planetary nebula, the remaining core, which is no longer undergoing fusion, becomes a dense, hot object known as a white dwarf.

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

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

  1. Neutron Star

  2. Supernova

  3. White Dwarf

  4. Black Hole
Reveal answer Fill a bubble to check yourself
D Correct answer
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

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

Why do massive stars have shorter lifespans than average 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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which of the following lists contains ONLY heavy elements

  1. Oxygen, Carbon, Iron

  2. Helium, Oxygen, Carbon

  3. Hydrogen, Helium, Carbon

  4. Iron, Hydrogen, Oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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

  1. Red giant

  2. Stellar Nebula

  3. Blackhole

  4. Main sequence
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

After a supernova explosion, the remains of the stellar core 

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Depending on the mass of the remaining core after a supernova, it will collapse into either a neutron star (if the mass is below the Tolman-Oppenheimer-Volkoff limit) or a black hole (if it exceeds that limit).

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

Analyzing the spectra of stars, the hottest stars are

  1. red

  2. orange

  3. bluish white

  4. there is no correlation between color and temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
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

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

White dwarfs

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Most stars give off energy

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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