Page 193 - Science Class 08

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Exercise
A. Tick (3) the correct op on.
1. Who first discovered that the sun is at the center of the universe?
(a) Ptolemy (b) Nicolas
(c) Aristotle (d) None of these
2. Which one of the following facts about galaxies is not true?
(a) There are about 16 galaxies with 3 millions light years of the earth.

(b) Spiral galaxies have arms.
(c) Galaxies are moving closer to each other.
(d) Ellip cal galaxies are shaped like a football.
3. Which of the following constella on appears like a hunter?

(a) Ursa Major (b) Ursa Minor
(c) Orion (d) Scorpius
4. Which of the following is not an inner planet?

(a) Mercury (b) Venus
(c) Earth (d) Jupiter
5. How many moons does Saturn have?
(a) 2 (b) 18

(c) 22 (d) 32
B. Fill in the blanks.
1. The Milky Way galaxy is ___________________ shaped something like a pin wheel.

2. Stars are generally made up of two gases namely ______________________ and
__________________ .

3. The brighter star, __________________ is about 8.7 light years away from the earth.
4. The Pole star got its name from a Greek word __________________ which means 'Pivot'.
5. Mars has two moons __________________ and __________________ .
6. The atmosphere of Neptune is mostly composed of __________________ and
__________________ .
7. The Halley comet appears once every __________________ years.

8. A ________________________ satellite is a satellite that remains fixed with respect to a
par cular point on the earth.

C. Write True or False.
1. Large Magellanic cloud is an irregular galaxy.
2. The brightness of a star depends on its size, shape, type and distance from the earth.

3. Proxima Centauri is the nearest galaxy to the Milky Way galaxy.
4. The Orion is easily visible in winter.
5. On Venus, the sun rises in the west and sets in the east.

Science-8 193