Free Our Universe 02 Practice Test - 4th Grade 

Question 1

Which of the following is the seventh planet from the Sun? 

A.

Saturn

B.

Neptune

C.

Uranus

D.

Mars

SOLUTION

Solution : C

- Our solar system has eight planets which revolve around the Sun.
- The order of planets in their distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. So, Uranus is the seventh planet from the Sun.

Question 2

How many planets are there in our solar system?

A. 7
B. 8
C. 9
D. 10

SOLUTION

Solution : B

- Till 2006, Pluto was considered as the last planet of our solar system but after that it was excluded and was reclassified as a dwarf planet.
- Now, there are 8 planets in our solar system, on count from Mercury to Neptune.

Question 3

___ is very similar to Earth in terms of size. 

A. Mars
B. Venus
C. Uranus
D. Pluto

SOLUTION

Solution : B

- Venus is very similar to Earth in terms of size and mass. Due to this Earth and Venus do often get called "Planetary Twins".

Question 4

Which of the following planet is often called a morning and an evening star?

A. Earth
B. Saturn
C. Mars
D. Venus

SOLUTION

Solution : D

- Venus appears in the eastern sky before sunrise. Sometimes it appears in the western sky just after sunset. Therefore it is often called a morning or an evening star.

Question 5

Which of the following planets rotate from east to west on their axis?

A. Saturn
B. Venus
C. Pluto
D. Uranus

SOLUTION

Solution : B and D

The rotation of planets Venus and Uranus on their axes, is somewhat unusual. They rotate from the East to the West, while all other planets rotate from the West to the East.

Question 6

An __ is a definite path in which planet revolves around the Sun.

A. asteroid
B. orbit
C. orion
D. ursa major

SOLUTION

Solution : B

- A planet has a definite path in which it revolves around the Sun. This path is called an orbit.

Question 7

Match the entries of column A with column B.

               A               B           
(a) Rocky planet (i) Pluto
(b) Gas giant (ii) Saturn
(c) Ice giant (iii) Uranus
(d) Dwarf planet (iv) Venus

A. (a) - (i), (b) - (ii), (c) - (iii), (d) -(iv)
B. (a) - (iv), (b) - (ii), (c) - (iii), (d) -(i)
C. (a) - (ii), (b) - (iv), (c) - (i), (d) -(iii)
D. (a) - (ii), (b) - (iv), (c) - (iii), (d) -(i)

SOLUTION

Solution : B

- Venus is known as the "rocky" or "terrestrial" planet as it is similar to Earth in composition.
- Saturn is known as the gas giant because it is made up of gases and it is too huge that about 760 earths can fit into it.
- Uranus is known as an ice giant because it is made up of ice and it is too huge that 63 earths can fit into it.
- Pluto is known as the dwarf planet because of its size as it is even smaller than the Earth's moon.

Question 8

Which of the following planets has the most extensive ring system?

A. Jupiter
B. Pluto
C. Saturn
D. Uranus

SOLUTION

Solution : C

The planet Saturn has the most extensive ring system in the Solar System. Its rings are made up of rock, dust and icy material. Pluto does not possess any rings around it. However, Jupiter and Uranus possess a system of rings which are mostly composed of dust and ice. But, they are not as extensive and complex as that of Saturn; rather, are faint.

Question 9

___ is the largest moon of Saturn.

A. Mimas
B. Dione
C. Titan
D. Tethys

SOLUTION

Solution : C

- Saturn has about 62 moons out of which Titan is the largest moon which is even bigger than mercury and pluto.
- Mimas, Dione and Tethys are also the moons of saturn.

Question 10

Region of universe that lies between the orbits of Mars and Jupiter is known as:

A. kuiper belt
B. comet belt
C. oort cloud
D. asteroid belt

SOLUTION

Solution : D

Asteroid are rocky and metallic objects that orbit around the Sun.
The vast majority of asteroids that orbit within the main asteroid belt are located between the orbits of Mars and Jupiter. 
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