Tag: properties of stars

Questions Related to properties of stars

Solar flares are associated with.

physics movement of the earth properties of stars life cycle of stars solar system and its planets types of galaxies galaxies

  1. Intense magnetic field

  2. Solar eclipse

  3. Lunar eclipse

  4. Nuclear fission reaction

Show answer
Correct Option: A
Explanation:

Solar flares are associated with intense magnetic field. A solar flare occurs when magnetic energy that has built up in the solar atmosphere is suddenly released.

Which is the part of sun where the energy is transported from superhot interior to cold outer layers by photons?

physics movement of the earth properties of stars life cycle of stars solar system and its planets types of galaxies galaxies

  1. Core

  2. Radiative Zone

  3. Convective zone

  4. None

Show answer
Correct Option: B
Explanation:

Radiative zone lies between the core and the convective zone. In radiative zone, energy resulted from the nuclear fusion in the core travels upwards by photons.

Sunspots on the photosphere are due to.

physics movement of the earth properties of stars life cycle of stars solar system and its planets types of galaxies galaxies

  1. Eclipses caused by planets

  2. Comparatively cooler regions

  3. Granulation's

  4. Cloudy weather on the earth

Show answer
Correct Option: B
Explanation:

Sunspots are temporary phenomenon on the sun photosphere that appears as spots darker than the surrounding area.

They are regions of reduced surface temperature. 
Answer is $B$

The reason for enormous energy output of the sun is.

physics movement of the earth properties of stars life cycle of stars solar system and its planets types of galaxies galaxies

  1. Combustion of hydrogen

  2. Formation of helium

  3. Thermo nuclear fusing reaction

  4. Electromagnetic field.

Show answer
Correct Option: B,C
Explanation:

Reason for enormous energy output of sun is the fusion reaction

$H + H \longrightarrow He + Energy$
Answer is $B$ and $C$

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.


Who observed galaxies moving away from us?

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

  1. Georges Lemaitre

  2. Arno Penzias

  3. Edwin Hubble

  4. Robert Wilson

Show answer
Correct Option: C
Explanation:

He was the Edwin Hubble in 1929 he identified the relationship between a galaxy distance and speed with which it is moving.

The red shift in the spectral lines of light reaching us from other galaxies implies that these galaxies:

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

  1. are moving closer to one another

  2. are moving farther apart from one another

  3. consist predominantly of red giant stars

  4. are in rapid rotation

Show answer
Correct Option: B
Explanation:

The red shift occurs due to increase due to increase in wavelength that would be due to the increasing distance between two galaxies, Red shift indicate that galaxy are mainly farther apart from one another

Evidence of various kinds suggests that at the center of our galaxy is a:

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

  1. quasar

  2. pulsar

  3. neutron star

  4. black hole

Show answer
Correct Option: D
Explanation:

Evidence of various kinds suggests that at the center of our galaxy is a black hole.