16. The Universe | General Science | Class 6

1. Name these –

(a) Birth place of stars

ANSWER:  Nebulae

(b) Biggest planet in the solar system

ANSWER: Jupiter

(c) The galaxy which is our neighbour

ANSWER: Andromeda

(d) Brightest planet in the solar system

ANSWER: Venus

(e) Planet with largest number of satellites

ANSWER: Jupiter

(f) Planets without a single satellite

ANSWER: Venus and Mercury

(g) Planet with a rotation different from other planets

ANSWER: Venus

(h) A celestial body that carries a tail along

ANSWER: Comet

2. Fill in the blanks.

(a) The group of galaxies of which our Milky Way is a part is called …………. .ANSWER: Local Group

(b) Comets are made of …………. .

ANSWER: Ice and dust particles

(c) The planet …………. appears as if it is rolling along its orbit.

ANSWER: Uranus

(d) …………. is a stormy planet.

ANSWER: Jupiter

(e) The Pole Star is the best example of a …………. type of star.

ANSWER: variable

3. Say if the statements given below are right or wrong. Rewrite the statements after correcting them.

i) Venus is the planet closest to the sun.

ANSWER: Wrong [right answer:  Mercury]

ii) Mercury is called a stormy planet.

ANSWER: Wrong [right answer:  Jupiter]

iii) Jupiter is the biggest planet.

ANSWER: Right

4. Answer the following.

(a) What is a special characteristic of the planet Mars ?

ANSWER: The highest and longest mountain in the solar system ‘Olympus Mons’ is located on Mars.

(b) What are the types of galaxies ?

ANSWER: The different types of galaxies are: Spiral Elliptical Barred spiral Irregular.

(c) Which celestial bodies does a galaxy include ?

ANSWER: A galaxy includes many other celestial bodies such as clusters of stars, nebulae, clouds of gases, clouds of dust, dead stars, newly born stars, etc.

(d) Name the different types of stars.

ANSWER: The different types of stars are:

1. Sun-like stars
2. Red Giants
3. Super Nova
4. Binary or Twin
5. Variable

(e) What are the types of comets and on what basis are they classified ?

ANSWER: Comets are classified in two main groups:

i. Long period comets : These comets take more than 200 years to complete one revolution

around the sun.

ii. Short period comets: These comets take less than 200 years to complete one revolution around the sun.

(f) What is the difference between meteors and meteorites ?

ANSWER:

Meteors: They are rocky pieces originating from the asteroid belt.  Smaller rocky pieces get completely burnt due to friction with air after they enter the earth’s atmosphere.

Meteorites: Sometimes the meteors do not burn completely and fall to the surface of the earth. These are called meteorites.

(g) What are the characteristics of the planet Neptune ?

ANSWER: Neptune is the eighth planet in the solar system. A season on Neptune lasts for about 41 years. On this planet winds blow with extremely high speed.

5. Match the following.

Group A                  Group B

(1) Galaxy                       (a) From east to west

(2) Comet                       (b) 33 satellites

(3) Sun-like star             (c) Spiral

(4) Saturn                      (d) Sirius

(5) Venus                        (e) Halley

ANSWER:

Group A                  Group B

(1) Galaxy                       (c) Spiral  

(2) Comet                       (e) Halley  

(3) Sun-like star             (d) Sirius

(4) Saturn                      (b) 33 satellites

(5) Venus                        (a) From east to west

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