Tag: life cycle of stars

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Questions Related to life cycle of stars

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

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

As the age of star increases

  1. Helium quantity increases

  2. Helium quantity decreases

  3. Helium quantity does not

    change

  4. Helium, Hydrogen both

    quantities increases
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As a star ages, it fuses hydrogen into helium in its core. Therefore, the proportion of helium increases over time as the hydrogen fuel is consumed.

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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).

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

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

  1.  stars

  2. black hole

  3. supernova

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A supernova is the violent explosion of a massive star, typically one that is at least eight times the mass of the Sun, occurring at the end of its life cycle.

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

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

  1. Red supergiant

  2. Blackhole

  3. Main sequence

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

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

The constellation of stars appear at different positions in the sky at different times during night mainly ________________________.

  1. Because earth rotates about its axis

  2. Because Earth revolves round the sun

  3. Because of optical illusion

  4. Because celestial bodies are changing their positions all the time
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The apparent motion of stars and constellations across the sky during the night is primarily caused by the rotation of the Earth on its axis, which makes the celestial sphere appear to rotate in the opposite direction.

Multiple choice physics life cycle of stars movement of the earth properties of stars types of galaxies

Mass (in kg) of the massive object at the centre of the milky way galaxy is of the order.

  1. $10 ^ { 32 }$

  2. $10 ^ { 37 }$

  3. $10 ^ { 43 }$

  4. $10 ^ { 29 }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The supermassive black hole at the center of the Milky Way, Sagittarius A*, has a mass estimated to be approximately 4 million solar masses. One solar mass is about 2 x 10^30 kg, so 4 x 10^6 * 2 x 10^30 = 8 x 10^36 kg, which is of the order 10^37.

Multiple choice physics life cycle of stars movement of the earth properties of stars types of galaxies

A galaxy that is moving toward the Earth will show:

  1. a red shift in the spectrum

  2. an increase in light years

  3. a decrease in brightness

  4. a blue shift in the spectrum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As galaxy move towards the earth the wavelength decreases and the frequency increase and colour changes to blue and also known as blue shift while opposite is known as red shift.