Tag: life cycle of stars

Questions Related to life cycle of stars

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

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).

______________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.

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

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

  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

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Correct Option: A

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

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

  1. $10 ^ { 32 }$

  2. $10 ^ { 37 }$

  3. $10 ^ { 43 }$

  4. $10 ^ { 29 }$

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Correct Option: B

A galaxy that is moving toward the Earth will show:

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

  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

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Correct Option: D
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.

Relative to the center of our galaxy:

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

  1. its starts are stationary

  2. its stars move entirely at random

  3. its stars revolve

  4. Population I starts are stationary and Population II star revolve

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Correct Option: C
Explanation:

The galactic center is the rotational center of milky way around which stars revolve.