The Sun

Q. The Sun is located at a distance of from the centre of the Milky Way galaxy.

1. $17,000ly$
2. $21,000ly$
3. $25,000ly$

Q.

Which of the following statements are true?

1. The orbit of a plane is elliptical with the sun at one of its foci.
2. The line joining the planet and the sun sweeps equal areas in equal intervals of time.
3. The square of the mean distance of a planet from the sun is proportional to the cube of its orbital period.

1. Only (i) and (ii)

2. Only (ii) and (iii)

3. Only (i) and (iii)

4. (i), (ii) and (iii)

Q. What is the star at the centre of our Solar system?

1. Sun
2. Earth
3. Orion
4. Rigel

Q. If you are the sun, write about your properties in your own words.

Q.

The nuclear fuel in the sun is ___________.

Q.

The nuclear fuel in the sun is

1. carbon

2. hydrogen

3. helium

4. nitrogen

Q. The surface temperature of the sun is as high as ________.

1. $5000\text{K}$
2. $5800\text{K}$
3. $1.5\times {10}^7\text{K}$
4. $1.5\times {10}^8\text{K}$

Q. The mass of the Sun is about $(1,00,000\times \text{m})$ times the mass of the Earth. What is the value of $\text{m}$?

1. 3.3

Q. The Sun's angular diameter is measured to be 1920". The distance D of the sun from the earth is 1.496 $\times {10}^{11}$ m. So find the diameter of the Sun.

Q.

Boron has 2 isotopes B-10 B-11. Th average atomic mass of boron is found to be 10.80u. Calculate the percentage abundance of these isotopes.

Q.

Assertion (A) Helium is used in diving apparatus.

Reason (R) Helium is very less soluble in blood.

1. Both Assertion and Reason are correct but Reason is the correct explanation for Assertion

2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

3. Assertion is correct but Reason is incorrect

4. Both Assertion and Reason are incorrect

Q. The star Rigel, otherwise known as Rājanya, has a mass of $42\times {10}^{30}\text{kg}$. Express the mass in the unit of solar mass (${\text{M}}_{\text{Sun}}$).

1. 21

Q.

The fuel used in the star is mainly:

1. coal

2. uranium

3. radium

4. hydrogen

Q. The Sun accounts forof the total mass of the Solar System.

1. $28\%$
2. $99.8\%$
3. $76\%$
4. $92.6\%$

Q. The surface temperature of the Sun is as high as.

1. $15000\text{K}$
2. $5800\text{K}$
3. $3200\text{K}$

Q. is used as a standard unit to measure the mass of other stars and celestial objects in the Universe.

1. Earth's mass
2. Solar mass
3. Lunar mass

Q. What causes the Lunar phases?

Q.

__________ velocity of the planet is constant when it revolves in an elliptical orbit around the Sun.

Q. What is Dark matter and baryonic mate?

Q. What is the diameter determined of sun?

1. 109 Venus diameters
2. 109 Mars diameters
3. 109 Jupiter diameters
4. 109 Earth diameters

Q. On which two days does the Sun rise exactly in the East?

1. March 21, September 23
2. April 21, July 23
3. March 23, September 21
4. June 21, December 22

Q. Which of the following is NOT a planet of our Solar System?

1. Sirius
2. Mercury
3. Earth
4. Saturn

Q. What is used as a standard unit to measure the mass of other stars and celestial objects in the Universe?

1. Mass of the Sun
2. Mass of the Moon
3. Mass of the Earth
4. Mass of the Jupiter

Q. The root mean square velocity of the molecules in a sample of helium is 57 th that of the molecules in a sample of hydrogen if the temperature of the hydrogen sample is 0c that of helium samples is about 1. Oc 2. 0k 3. 273c 4. 100c

Q.

The mass of the sun is about _____________ tonnes.

Q. A star which appears blue will be

1. As hot as Sun
2. Cooler than Sun
3. Very cold indeed
4. Much hotter than Sun

Q. Planets and other space objects stay together in our Solar system, because:

1. Of the stars of Andromeda galaxy
2. Planets exert gravity on each other
3. Pluto is no more considered a planet
4. Of the Sun's immense gravity

Q. Why is the Sun important for us?

1. Its gravitational force keeps all planets and other heavenly bodies in place.
2. All of the above.
3. It is the main source of light and heat.
4. It is the source of energy.

Q.

___is formed when massive and heavy stars die.

1. Black Hole

2. Black Planet

3. Black Circle

4. Black Space

Q. The star Aldebaran, otherwise known as Rōhini, has a mass of $1.16{\text{M}}_{\text{Sun}}$, where ${\text{M}}_{\text{Sun}}$ is the mass of the Sun. Express Rōhini’s mass in $\text{kg}$.

1. $2.8\times {10}^{30}\text{kg}$
2. $2.5\times {10}^{30}\text{kg}$
3. $1.15\times {10}^{30}\text{kg}$
4. $2.32\times {10}^{30}\text{kg}$