Tag: properties of stars

Questions Related to properties of stars

Why is the Sun important for us?

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

  1. It is the main source of light and heat.

  2. It is the source of energy.

  3. Its gravitational force keeps all planets and other heavenly bodies in place.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Sun is very important to us as it is the main source of light and heat, i.e, the main source of energy. Besides, its gravitational force keeps all planets and other heavenly bodies in place.

The highest number of atoms in the Sun are of:

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

  1. hydrogen

  2. helium

  3. oxygen

  4. nitrogen

Show answer
Correct Option: A
Explanation:

Percentage of total number of atoms:
Hydrogen: $91.2$
Helium: $8.7$
Oxygen: $0.078$
Nitrogen: $0.0088$

Sun is a/an:

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

  1. Star

  2. Planet

  3. Galaxy

  4. Asteroid

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Correct Option: A
Explanation:

Sun falls in the classification of stars. 

It is the center of solar system.

Why does sun appear larger than other stars to us?

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

  1. It is larger than other stars.

  2. It is farther than other stars.

  3. It is closer than other stars.

  4. It is faster than other stars.

Show answer
Correct Option: C
Explanation:

Sun is much closer to us as compared to other stars. Hence, it subtends larger angle at eyes compared to other stars and appear larger. Note that many stars are much larger than sun in size.

Age of sun is about:

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

  1. 4.5 billion years

  2. 45 million years

  3. 10 thousand years

  4. Hundred thousand years

Show answer
Correct Option: A
Explanation:

Sun is about 4.5 billion years old. 

It is still younger than many other stars.

Inside the Sun, _______ reactions take place at high temperature and enormous pressure. Fill in the blank
physics movement of the earth properties of stars life cycle of stars solar system and its planets types of galaxies galaxies

  1. nuclear fusion

  2. nuclear fission

  3. catalyze

  4. none of the above

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Correct Option: A
Explanation:

Nuclear fusion means merging of separate elements as a unified whole to form heavy nuclei resulting in release of enormous amount of energy.

Sun is:

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

  1. a hot ball of glowing gases

  2. a cold rock

  3. a cold sphere of gases and moisture

  4. a solid sphere of minerals

Show answer
Correct Option: A
Explanation:

The sun is a star.

A hot ball of glowing gases.

What is the angular size of Sun?

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

  1. $0.5'$

  2. $1.5'$

  3. $0.2'$

  4. $2.5'$

Show answer
Correct Option: A
Explanation:

The angluar size of the Sun is 30 arcmin, 

i.e., approx $0.5'$.

How much thick is the photosphere of sun?

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

  1. 500km

  2. 5000km

  3. 50km

  4. 5km

Show answer
Correct Option: A
Explanation:

The deepest layer of the Sun is the photosphere. This layer is the thinnest layer comprising of just 500 km in thickness.

From which part of Sun does the energy from nuclear fusion is generated?

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. From both B and C

Show answer
Correct Option: A
Explanation:

Central region of the Sun is called the core. Core is where the nuclear reaction takes place. 

Core is the region where the energy from nuclear fusion is generated.