Tag: our solar system

Questions Related to our solar system

The planets do not emit light of their own. This statement is:

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. True

  2. False

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Correct Option: A
Explanation:

Planets are solid heavenly bodies which revolve around the Sun in a closed elliptical paths. A planet is made of rock and metal and produces no light of its own. A planet shines because it reflects the light of the Sun. Since, the planets are much nearer to the stars, they appear to be big and do not twinkle at night.
Hence, the statement is true.

Fill in the blank:

The plane, in which the Earth revolves around the Sun, is called _______ plane of Sun.

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. equatorial

  2. tangential

  3. normal

  4. orbital

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Correct Option: D
Explanation:

The plane in which Earth revolves around the Sun is the orbital plane or ecliptic. 

Which of the following statement is incorrect?

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. Planet jupiter shows phases like Moon

  2. The axis of rotation of Earth is slightly tilted with respect to the plane of its orbit around the Sun

  3. Diameter of Jupiter is about 11 times the diameter of the Earth

  4. Planet Uranus is made up mainly helium and nitrogen gases

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Correct Option: A

Which of the following is a proof of the Earth's revolution around the Sun? 

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. Rising and setting of the Sun

  2. The Foucault pendulum experiment

  3. Parallax of stars

  4. Seasons

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Correct Option: D

The earth revolves about the sun in an elliptical orbit with mean radius $9.3 \times 10^7\ m$ in a period of $1$ year. Assuming that there are no outside influences, then

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. The earth's kinetic energy remains constant.

  2. The earth's angular momentum remains constant.

  3. The earth's potential energy remains constant.

  4. All the statements above are correct.

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Correct Option: C

Earth is revolving around the sun.If the distance of earth from the sun is reduced to $\frac { 1 } { 4 } \mathrm { th }$ of the present distance, then the length of present day will be reduced by 

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. 1 / 4

  2. 1 / 2

  3. 1 / 8

  4. 1 / 6

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Correct Option: A

The mass of a planet Jupiter is $1.9 \times 10^{27} kg$ and that of the Sun is $1.99 \times 10^{30} kg$. The mean distance of the Sun from Jupiter is $7.8 \times 10^{11} m$. The gravitational force, which the Sun exerts on Jupiter is.

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. $4.1 \times 10^{23} N$

  2. $4.1 \times 10^{34} N$

  3. $2.2 \times 10^{23} N$

  4. $2.2 \times 10^{34} N$

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Correct Option: A

Two plates move around the Sun. The periodic times and the mean radii of the orbits are $T _1, T _2$ and $r _1, r _2$ respectively. The ratio $\dfrac{T _1}{T _2}$ is equal to.

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. $\left (\dfrac{r _1}{r _2} \right)^{\dfrac{1}{2}}$

  2. $\left (\dfrac{r _1}{r _2} \right)$

  3. $\left (\dfrac{r _1}{r _2} \right)^{2}$

  4. $\left (\dfrac{r _1}{r _2} \right)^{\dfrac{3}{2}}$

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Correct Option: D

As per modern classification of solar system, number of planets excluding Earth is: 

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. $7$

  2. $8$

  3. $9$

  4. $10$

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Correct Option: A
Explanation:
As per older convention, there used to be $9$ planets in total in the solar system. As per modern convention, Pluto is no more a planet. So, excluding Earth, there are $7$ planets in total.

The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accommodate ? 

physics our solar system planets of the solar system solar system and sun introduction to solar system

  1. 1331

  2. 1221

  3. 111

  4. None of these

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Correct Option: A
Explanation:

Planets are like spheres. Volume of a sphere is given by, 
V = $\displaystyle{\frac{4}{3}\pi r^3}$ 
Let the r$ _1$, r$ _2$ be radii of the Jupiter and the Earth respectively. 
r$ _1$ $= 11r _2$ _(1)
Volume of Jupiter, V$ _1$ = $\displaystyle{\frac{4}{3}\pi r^3 _1}$ _(2) 
Volume of Earth, V$ _2$ = $\displaystyle{\frac{4}{3}\pi r^3 _2}$ _(3) 
$\displaystyle{\frac{(2)}{(3)} \Rightarrow \frac{V _1}{V _2} = \frac{\frac{4}{3}\pi r _1^3}{\frac{4}{3} \pi r _2^3} = \frac{r _1^3}{r _2^3}}$ 
$\displaystyle{\frac{V _1}{V _2} = \frac{r _1^3}{r _2^3} = \frac{(11r _2)^3}{r _2^3} = (11)^3}$ = 1331 
Jupiter can accommodate 1331 number of Earths within it.